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source: MondoRescue/branches/2.2.9/mindi-busybox/include/libbb.h@ 2725

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Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 13 years ago
Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 68.8 KB

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1	/* vi: set sw=4 ts=4: */
2	/*
3	* Busybox main internal header file
4	*
5	* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
6	* Permission has been granted to redistribute this code under GPL.
7	*
8	* Licensed under GPLv2, see file LICENSE in this source tree.
9	*/
10	#ifndef LIBBB_H
11	#define LIBBB_H 1
12
13	#include "platform.h"
14
15	#include <ctype.h>
16	#include <dirent.h>
17	#include <errno.h>
18	#include <fcntl.h>
19	#include <inttypes.h>
20	#include <netdb.h>
21	#include <setjmp.h>
22	#include <signal.h>
23	#include <stdint.h>
24	#include <stdio.h>
25	#include <stdlib.h>
26	#include <stdarg.h>
27	#include <stddef.h>
28	#include <string.h>
29	#include <sys/poll.h>
30	#include <sys/ioctl.h>
31	#include <sys/mman.h>
32	#include <sys/socket.h>
33	#include <sys/stat.h>
34	#include <sys/time.h>
35	#include <sys/types.h>
36	#include <sys/wait.h>
37	#include <termios.h>
38	#include <time.h>
39	#include <unistd.h>
40	#include <sys/param.h>
41	#ifdef HAVE_MNTENT_H
42	# include <mntent.h>
43	#endif
44	#ifdef HAVE_SYS_STATFS_H
45	# include <sys/statfs.h>
46	#endif
47	#if ENABLE_SELINUX
48	# include <selinux/selinux.h>
49	# include <selinux/context.h>
50	# include <selinux/flask.h>
51	# include <selinux/av_permissions.h>
52	#endif
53	#if ENABLE_LOCALE_SUPPORT
54	# include <locale.h>
55	#else
56	# define setlocale(x,y) ((void)0)
57	#endif
58	#ifdef DMALLOC
59	# include <dmalloc.h>
60	#endif
61	#include <pwd.h>
62	#include <grp.h>
63	#if ENABLE_FEATURE_SHADOWPASSWDS
64	# if !ENABLE_USE_BB_SHADOW
65	/* If using busybox's shadow implementation, do not include the shadow.h
66	* header as the toolchain may not provide it at all.
67	*/
68	# include <shadow.h>
69	# endif
70	#endif
71	#if defined __FreeBSD__ \|\| defined __OpenBSD__
72	# include <netinet/in.h>
73	# include <arpa/inet.h>
74	#elif defined __APPLE__
75	# include <netinet/in.h>
76	#else
77	# include <arpa/inet.h>
78	# if !defined(__socklen_t_defined) && !defined(_SOCKLEN_T_DECLARED)
79	/* We #define socklen_t after includes, otherwise we get
80	* typedef redefinition errors from system headers
81	* (in case "is it defined already" detection above failed)
82	*/
83	# define socklen_t bb_socklen_t
84	typedef unsigned socklen_t;
85	# endif
86	#endif
87
88
89	/* Some libc's forget to declare these, do it ourself */
90
91	extern char **environ;
92	#if defined(__GLIBC__) && __GLIBC__ < 2
93	int vdprintf(int d, const char *format, va_list ap);
94	#endif
95	/* klogctl is in libc's klog.h, but we cheat and not #include that */
96	int klogctl(int type, char *b, int len);
97	/* This is declared here rather than #including <libgen.h> in order to avoid
98	* confusing the two versions of basename. See the dirname/basename man page
99	* for details. */
100	#if !defined __FreeBSD__
101	char dirname(char path);
102	#endif
103	/* Include our own copy of struct sysinfo to avoid binary compatibility
104	* problems with Linux 2.4, which changed things. Grumble, grumble. */
105	struct sysinfo {
106	long uptime; /* Seconds since boot */
107	unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
108	unsigned long totalram; /* Total usable main memory size */
109	unsigned long freeram; /* Available memory size */
110	unsigned long sharedram; /* Amount of shared memory */
111	unsigned long bufferram; /* Memory used by buffers */
112	unsigned long totalswap; /* Total swap space size */
113	unsigned long freeswap; /* swap space still available */
114	unsigned short procs; /* Number of current processes */
115	unsigned short pad; /* Padding needed for m68k */
116	unsigned long totalhigh; /* Total high memory size */
117	unsigned long freehigh; /* Available high memory size */
118	unsigned int mem_unit; /* Memory unit size in bytes */
119	char _f[20 - 2 * sizeof(long) - sizeof(int)]; /* Padding: libc5 uses this.. */
120	};
121	int sysinfo(struct sysinfo* info);
122	#ifndef PATH_MAX
123	# define PATH_MAX 256
124	#endif
125	#ifndef BUFSIZ
126	# define BUFSIZ 4096
127	#endif
128
129
130	/* Make all declarations hidden (-fvisibility flag only affects definitions) */
131	/* (don't include system headers after this until corresponding pop!) */
132	PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
133
134
135	#if ENABLE_USE_BB_PWD_GRP
136	# include "pwd_.h"
137	# include "grp_.h"
138	#endif
139	#if ENABLE_FEATURE_SHADOWPASSWDS
140	# if ENABLE_USE_BB_SHADOW
141	# include "shadow_.h"
142	# endif
143	#endif
144
145	/* Tested to work correctly with all int types (IIRC :]) */
146	#define MAXINT(T) (T)( \
147	((T)-1) > 0 \
148	? (T)-1 \
149	: (T)~((T)1 << (sizeof(T)*8-1)) \
150	)
151
152	#define MININT(T) (T)( \
153	((T)-1) > 0 \
154	? (T)0 \
155	: ((T)1 << (sizeof(T)*8-1)) \
156	)
157
158	/* Large file support */
159	/* Note that CONFIG_LFS=y forces bbox to be built with all common ops
160	* (stat, lseek etc) mapped to "largefile" variants by libc.
161	* Practically it means that open() automatically has O_LARGEFILE added
162	* and all filesize/file_offset parameters and struct members are "large"
163	* (in today's world - signed 64bit). For full support of large files,
164	* we need a few helper #defines (below) and careful use of off_t
165	* instead of int/ssize_t. No lseek64(), O_LARGEFILE etc necessary */
166	#if ENABLE_LFS
167	/* CONFIG_LFS is on */
168	# if ULONG_MAX > 0xffffffff
169	/* "long" is long enough on this system */
170	typedef unsigned long uoff_t;
171	# define XATOOFF(a) xatoul_range(a, 0, LONG_MAX)
172	/* usage: sz = BB_STRTOOFF(s, NULL, 10); if (errno \|\| sz < 0) die(); */
173	# define BB_STRTOOFF bb_strtoul
174	# define STRTOOFF strtoul
175	/* usage: printf("size: %"OFF_FMT"d (%"OFF_FMT"x)\n", sz, sz); */
176	# define OFF_FMT "l"
177	# else
178	/* "long" is too short, need "long long" */
179	typedef unsigned long long uoff_t;
180	# define XATOOFF(a) xatoull_range(a, 0, LLONG_MAX)
181	# define BB_STRTOOFF bb_strtoull
182	# define STRTOOFF strtoull
183	# define OFF_FMT "ll"
184	# endif
185	#else
186	/* CONFIG_LFS is off */
187	# if UINT_MAX == 0xffffffff
188	/* While sizeof(off_t) == sizeof(int), off_t is typedef'ed to long anyway.
189	* gcc will throw warnings on printf("%d", off_t). Crap... */
190	typedef unsigned long uoff_t;
191	# define XATOOFF(a) xatoi_positive(a)
192	# define BB_STRTOOFF bb_strtou
193	# define STRTOOFF strtol
194	# define OFF_FMT "l"
195	# else
196	typedef unsigned long uoff_t;
197	# define XATOOFF(a) xatoul_range(a, 0, LONG_MAX)
198	# define BB_STRTOOFF bb_strtoul
199	# define STRTOOFF strtol
200	# define OFF_FMT "l"
201	# endif
202	#endif
203	/* scary. better ideas? (but do test them first!) */
204	#define OFF_T_MAX ((off_t)~((off_t)1 << (sizeof(off_t)*8-1)))
205
206	/* Some useful definitions */
207	#undef FALSE
208	#define FALSE ((int) 0)
209	#undef TRUE
210	#define TRUE ((int) 1)
211	#undef SKIP
212	#define SKIP ((int) 2)
213
214	/* for mtab.c */
215	#define MTAB_GETMOUNTPT '1'
216	#define MTAB_GETDEVICE '2'
217
218	#define BUF_SIZE 8192
219	#define EXPAND_ALLOC 1024
220
221	/* Macros for min/max. */
222	#ifndef MIN
223	#define MIN(a,b) (((a)<(b))?(a):(b))
224	#endif
225
226	#ifndef MAX
227	#define MAX(a,b) (((a)>(b))?(a):(b))
228	#endif
229
230	/* buffer allocation schemes */
231	#if ENABLE_FEATURE_BUFFERS_GO_ON_STACK
232	#define RESERVE_CONFIG_BUFFER(buffer,len) char buffer[len]
233	#define RESERVE_CONFIG_UBUFFER(buffer,len) unsigned char buffer[len]
234	#define RELEASE_CONFIG_BUFFER(buffer) ((void)0)
235	#else
236	#if ENABLE_FEATURE_BUFFERS_GO_IN_BSS
237	#define RESERVE_CONFIG_BUFFER(buffer,len) static char buffer[len]
238	#define RESERVE_CONFIG_UBUFFER(buffer,len) static unsigned char buffer[len]
239	#define RELEASE_CONFIG_BUFFER(buffer) ((void)0)
240	#else
241	#define RESERVE_CONFIG_BUFFER(buffer,len) char *buffer = xmalloc(len)
242	#define RESERVE_CONFIG_UBUFFER(buffer,len) unsigned char *buffer = xmalloc(len)
243	#define RELEASE_CONFIG_BUFFER(buffer) free(buffer)
244	#endif
245	#endif
246
247	#if defined(__GLIBC__)
248	/* glibc uses __errno_location() to get a ptr to errno */
249	/* We can just memorize it once - no multithreading in busybox :) */
250	extern int *const bb_errno;
251	#undef errno
252	#define errno (*bb_errno)
253	#endif
254
255	#if !(ULONG_MAX > 0xffffffff)
256	/* Only 32-bit CPUs need this, 64-bit ones use inlined version */
257	uint64_t bb_bswap_64(uint64_t x) FAST_FUNC;
258	#endif
259
260	unsigned long long monotonic_ns(void) FAST_FUNC;
261	unsigned long long monotonic_us(void) FAST_FUNC;
262	unsigned long long monotonic_ms(void) FAST_FUNC;
263	unsigned monotonic_sec(void) FAST_FUNC;
264
265	extern void chomp(char *s) FAST_FUNC;
266	extern void trim(char *s) FAST_FUNC;
267	extern char skip_whitespace(const char ) FAST_FUNC;
268	extern char skip_non_whitespace(const char ) FAST_FUNC;
269	extern char skip_dev_pfx(const char tty_name) FAST_FUNC;
270
271	extern char strrstr(const char haystack, const char *needle) FAST_FUNC;
272
273	//TODO: supply a pointer to char[11] buffer (avoid statics)?
274	extern const char *bb_mode_string(mode_t mode) FAST_FUNC;
275	extern int is_directory(const char name, int followLinks, struct stat statBuf) FAST_FUNC;
276	enum { /* DO NOT CHANGE THESE VALUES! cp.c, mv.c, install.c depend on them. */
277	FILEUTILS_PRESERVE_STATUS = 1 << 0, /* -p */
278	FILEUTILS_DEREFERENCE = 1 << 1, /* !-d */
279	FILEUTILS_RECUR = 1 << 2, /* -R */
280	FILEUTILS_FORCE = 1 << 3, /* -f */
281	FILEUTILS_INTERACTIVE = 1 << 4, /* -i */
282	FILEUTILS_MAKE_HARDLINK = 1 << 5, /* -l */
283	FILEUTILS_MAKE_SOFTLINK = 1 << 6, /* -s */
284	FILEUTILS_DEREF_SOFTLINK = 1 << 7, /* -L */
285	FILEUTILS_DEREFERENCE_L0 = 1 << 8, /* -H */
286	#if ENABLE_SELINUX
287	FILEUTILS_PRESERVE_SECURITY_CONTEXT = 1 << 9, /* -c */
288	FILEUTILS_SET_SECURITY_CONTEXT = 1 << 10,
289	#endif
290	};
291	#define FILEUTILS_CP_OPTSTR "pdRfilsLH" IF_SELINUX("c")
292	extern int remove_file(const char *path, int flags) FAST_FUNC;
293	/* NB: without FILEUTILS_RECUR in flags, it will basically "cat"
294	* the source, not copy (unless "source" is a directory).
295	* This makes "cp /dev/null file" and "install /dev/null file" (!!!)
296	* work coreutils-compatibly. */
297	extern int copy_file(const char source, const char dest, int flags) FAST_FUNC;
298
299	enum {
300	ACTION_RECURSE = (1 << 0),
301	ACTION_FOLLOWLINKS = (1 << 1),
302	ACTION_FOLLOWLINKS_L0 = (1 << 2),
303	ACTION_DEPTHFIRST = (1 << 3),
304	/ACTION_REVERSE = (1 << 4), - unused /
305	ACTION_QUIET = (1 << 5),
306	ACTION_DANGLING_OK = (1 << 6),
307	};
308	typedef uint8_t recurse_flags_t;
309	extern int recursive_action(const char *fileName, unsigned flags,
310	int FAST_FUNC (fileAction)(const char fileName, struct stat* statbuf, void* userData, int depth),
311	int FAST_FUNC (dirAction)(const char fileName, struct stat* statbuf, void* userData, int depth),
312	void* userData, unsigned depth) FAST_FUNC;
313	extern int device_open(const char *device, int mode) FAST_FUNC;
314	enum { GETPTY_BUFSIZE = 16 }; /* more than enough for "/dev/ttyXXX" */
315	extern int xgetpty(char *line) FAST_FUNC;
316	extern int get_console_fd_or_die(void) FAST_FUNC;
317	extern void console_make_active(int fd, const int vt_num) FAST_FUNC;
318	extern char find_block_device(const char path) FAST_FUNC;
319	/* bb_copyfd_XX print read/write errors and return -1 if they occur */
320	extern off_t bb_copyfd_eof(int fd1, int fd2) FAST_FUNC;
321	extern off_t bb_copyfd_size(int fd1, int fd2, off_t size) FAST_FUNC;
322	extern void bb_copyfd_exact_size(int fd1, int fd2, off_t size) FAST_FUNC;
323	/* "short" copy can be detected by return value < size */
324	/* this helper yells "short read!" if param is not -1 */
325	extern void complain_copyfd_and_die(off_t sz) NORETURN FAST_FUNC;
326	extern char bb_process_escape_sequence(const char **ptr) FAST_FUNC;
327	char* strcpy_and_process_escape_sequences(char dst, const char src) FAST_FUNC;
328	/* xxxx_strip version can modify its parameter:
329	* "/" -> "/"
330	* "abc" -> "abc"
331	* "abc/def" -> "def"
332	* "abc/def/" -> "def" !!
333	*/
334	extern char bb_get_last_path_component_strip(char path) FAST_FUNC;
335	/* "abc/def/" -> "" and it never modifies 'path' */
336	extern char bb_get_last_path_component_nostrip(const char path) FAST_FUNC;
337
338	int ndelay_on(int fd) FAST_FUNC;
339	int ndelay_off(int fd) FAST_FUNC;
340	int close_on_exec_on(int fd) FAST_FUNC;
341	void xdup2(int, int) FAST_FUNC;
342	void xmove_fd(int, int) FAST_FUNC;
343
344
345	DIR xopendir(const char path) FAST_FUNC;
346	DIR warn_opendir(const char path) FAST_FUNC;
347
348	char xmalloc_realpath(const char path) FAST_FUNC RETURNS_MALLOC;
349	char xmalloc_readlink(const char path) FAST_FUNC RETURNS_MALLOC;
350	char xmalloc_readlink_or_warn(const char path) FAST_FUNC RETURNS_MALLOC;
351	/* !RETURNS_MALLOC: it's a realloc-like function */
352	char xrealloc_getcwd_or_warn(char cwd) FAST_FUNC;
353
354	char xmalloc_follow_symlinks(const char path) FAST_FUNC RETURNS_MALLOC;
355
356
357	enum {
358	/* bb_signals(BB_FATAL_SIGS, handler) catches all signals which
359	* otherwise would kill us, except for those resulting from bugs:
360	* SIGSEGV, SIGILL, SIGFPE.
361	* Other fatal signals not included (TODO?):
362	* SIGBUS Bus error (bad memory access)
363	* SIGPOLL Pollable event. Synonym of SIGIO
364	* SIGPROF Profiling timer expired
365	* SIGSYS Bad argument to routine
366	* SIGTRAP Trace/breakpoint trap
367	*
368	* The only known arch with some of these sigs not fitting
369	* into 32 bits is parisc (SIGXCPU=33, SIGXFSZ=34, SIGSTKFLT=36).
370	* Dance around with long long to guard against that...
371	*/
372	BB_FATAL_SIGS = (int)(0
373	+ (1LL << SIGHUP)
374	+ (1LL << SIGINT)
375	+ (1LL << SIGTERM)
376	+ (1LL << SIGPIPE) // Write to pipe with no readers
377	+ (1LL << SIGQUIT) // Quit from keyboard
378	+ (1LL << SIGABRT) // Abort signal from abort(3)
379	+ (1LL << SIGALRM) // Timer signal from alarm(2)
380	+ (1LL << SIGVTALRM) // Virtual alarm clock
381	+ (1LL << SIGXCPU) // CPU time limit exceeded
382	+ (1LL << SIGXFSZ) // File size limit exceeded
383	+ (1LL << SIGUSR1) // Yes kids, these are also fatal!
384	+ (1LL << SIGUSR2)
385	+ 0),
386	};
387	void bb_signals(int sigs, void (*f)(int)) FAST_FUNC;
388	/* Unlike signal() and bb_signals, sets handler with sigaction()
389	* and in a way that while signal handler is run, no other signals
390	* will be blocked; syscalls will not be restarted: */
391	void bb_signals_recursive_norestart(int sigs, void (*f)(int)) FAST_FUNC;
392	/* syscalls like read() will be interrupted with EINTR: */
393	void signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
394	/* syscalls like read() won't be interrupted (though select/poll will be): */
395	void signal_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
396	void wait_for_any_sig(void) FAST_FUNC;
397	void kill_myself_with_sig(int sig) NORETURN FAST_FUNC;
398	void sig_block(int sig) FAST_FUNC;
399	void sig_unblock(int sig) FAST_FUNC;
400	/* Will do sigaction(signum, act, NULL): */
401	int sigaction_set(int sig, const struct sigaction *act) FAST_FUNC;
402	/* SIG_BLOCK/SIG_UNBLOCK all signals: */
403	int sigprocmask_allsigs(int how) FAST_FUNC;
404	/* Standard handler which just records signo */
405	extern smallint bb_got_signal;
406	void record_signo(int signo); /* not FAST_FUNC! */
407
408
409	void xsetgid(gid_t gid) FAST_FUNC;
410	void xsetuid(uid_t uid) FAST_FUNC;
411	void xchdir(const char *path) FAST_FUNC;
412	void xchroot(const char *path) FAST_FUNC;
413	void xsetenv(const char key, const char value) FAST_FUNC;
414	void bb_unsetenv(const char *key) FAST_FUNC;
415	void bb_unsetenv_and_free(char *key) FAST_FUNC;
416	void xunlink(const char *pathname) FAST_FUNC;
417	void xstat(const char pathname, struct stat buf) FAST_FUNC;
418	void xfstat(int fd, struct stat buf, const char errmsg) FAST_FUNC;
419	int xopen(const char *pathname, int flags) FAST_FUNC;
420	int xopen_nonblocking(const char *pathname) FAST_FUNC;
421	int xopen3(const char *pathname, int flags, int mode) FAST_FUNC;
422	int open_or_warn(const char *pathname, int flags) FAST_FUNC;
423	int open3_or_warn(const char *pathname, int flags, int mode) FAST_FUNC;
424	int open_or_warn_stdin(const char *pathname) FAST_FUNC;
425	int xopen_stdin(const char *pathname) FAST_FUNC;
426	void xrename(const char oldpath, const char newpath) FAST_FUNC;
427	int rename_or_warn(const char oldpath, const char newpath) FAST_FUNC;
428	off_t xlseek(int fd, off_t offset, int whence) FAST_FUNC;
429	int xmkstemp(char *template) FAST_FUNC;
430	off_t fdlength(int fd) FAST_FUNC;
431
432	uoff_t FAST_FUNC get_volume_size_in_bytes(int fd,
433	const char *override,
434	unsigned override_units,
435	int extend);
436
437	void xpipe(int filedes[2]) FAST_FUNC;
438	/* In this form code with pipes is much more readable */
439	struct fd_pair { int rd; int wr; };
440	#define piped_pair(pair) pipe(&((pair).rd))
441	#define xpiped_pair(pair) xpipe(&((pair).rd))
442
443	/* Useful for having small structure members/global variables */
444	typedef int8_t socktype_t;
445	typedef int8_t family_t;
446	struct BUG_too_small {
447	char BUG_socktype_t_too_small[(0
448	\| SOCK_STREAM
449	\| SOCK_DGRAM
450	\| SOCK_RDM
451	\| SOCK_SEQPACKET
452	\| SOCK_RAW
453	) <= 127 ? 1 : -1];
454	char BUG_family_t_too_small[(0
455	\| AF_UNSPEC
456	\| AF_INET
457	\| AF_INET6
458	\| AF_UNIX
459	#ifdef AF_PACKET
460	\| AF_PACKET
461	#endif
462	#ifdef AF_NETLINK
463	\| AF_NETLINK
464	#endif
465	/* \| AF_DECnet */
466	/* \| AF_IPX */
467	) <= 127 ? 1 : -1];
468	};
469
470
471	void parse_datestr(const char date_str, struct tm ptm) FAST_FUNC;
472	time_t validate_tm_time(const char date_str, struct tm ptm) FAST_FUNC;
473
474
475	int xsocket(int domain, int type, int protocol) FAST_FUNC;
476	void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen) FAST_FUNC;
477	void xlisten(int s, int backlog) FAST_FUNC;
478	void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen) FAST_FUNC;
479	ssize_t xsendto(int s, const void buf, size_t len, const struct sockaddr to,
480	socklen_t tolen) FAST_FUNC;
481	/* SO_REUSEADDR allows a server to rebind to an address that is already
482	* "in use" by old connections to e.g. previous server instance which is
483	* killed or crashed. Without it bind will fail until all such connections
484	* time out. Linux does not allow multiple live binds on same ip:port
485	* regardless of SO_REUSEADDR (unlike some other flavors of Unix).
486	* Turn it on before you call bind(). */
487	void setsockopt_reuseaddr(int fd) FAST_FUNC; /* On Linux this never fails. */
488	int setsockopt_broadcast(int fd) FAST_FUNC;
489	int setsockopt_bindtodevice(int fd, const char *iface) FAST_FUNC;
490	/* NB: returns port in host byte order */
491	unsigned bb_lookup_port(const char port, const char protocol, unsigned default_port) FAST_FUNC;
492	typedef struct len_and_sockaddr {
493	socklen_t len;
494	union {
495	struct sockaddr sa;
496	struct sockaddr_in sin;
497	#if ENABLE_FEATURE_IPV6
498	struct sockaddr_in6 sin6;
499	#endif
500	} u;
501	} len_and_sockaddr;
502	enum {
503	LSA_LEN_SIZE = offsetof(len_and_sockaddr, u),
504	LSA_SIZEOF_SA = sizeof(
505	union {
506	struct sockaddr sa;
507	struct sockaddr_in sin;
508	#if ENABLE_FEATURE_IPV6
509	struct sockaddr_in6 sin6;
510	#endif
511	}
512	)
513	};
514	/* Create stream socket, and allocate suitable lsa.
515	* (lsa of correct size and lsa->sa.sa_family (AF_INET/AF_INET6))
516	* af == AF_UNSPEC will result in trying to create IPv6 socket,
517	* and if kernel doesn't support it, fall back to IPv4.
518	* This is useful if you plan to bind to resulting local lsa.
519	*/
520	#if ENABLE_FEATURE_IPV6
521	int xsocket_type(len_and_sockaddr **lsap, int af, int sock_type) FAST_FUNC;
522	#else
523	int xsocket_type(len_and_sockaddr **lsap, int sock_type) FAST_FUNC;
524	#define xsocket_type(lsap, af, sock_type) xsocket_type((lsap), (sock_type))
525	#endif
526	int xsocket_stream(len_and_sockaddr **lsap) FAST_FUNC;
527	/* Create server socket bound to bindaddr:port. bindaddr can be NULL,
528	* numeric IP ("N.N.N.N") or numeric IPv6 address,
529	* and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
530	* Only if there is no suffix, port argument is used */
531	/* NB: these set SO_REUSEADDR before bind */
532	int create_and_bind_stream_or_die(const char *bindaddr, int port) FAST_FUNC;
533	int create_and_bind_dgram_or_die(const char *bindaddr, int port) FAST_FUNC;
534	/* Create client TCP socket connected to peer:port. Peer cannot be NULL.
535	* Peer can be numeric IP ("N.N.N.N"), numeric IPv6 address or hostname,
536	* and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
537	* If there is no suffix, port argument is used */
538	int create_and_connect_stream_or_die(const char *peer, int port) FAST_FUNC;
539	/* Connect to peer identified by lsa */
540	int xconnect_stream(const len_and_sockaddr *lsa) FAST_FUNC;
541	/* Get local address of bound or accepted socket */
542	len_and_sockaddr *get_sock_lsa(int fd) FAST_FUNC RETURNS_MALLOC;
543	/* Get remote address of connected or accepted socket */
544	len_and_sockaddr *get_peer_lsa(int fd) FAST_FUNC RETURNS_MALLOC;
545	/* Return malloc'ed len_and_sockaddr with socket address of host:port
546	* Currently will return IPv4 or IPv6 sockaddrs only
547	* (depending on host), but in theory nothing prevents e.g.
548	* UNIX socket address being returned, IPX sockaddr etc...
549	* On error does bb_error_msg and returns NULL */
550	len_and_sockaddr* host2sockaddr(const char *host, int port) FAST_FUNC RETURNS_MALLOC;
551	/* Version which dies on error */
552	len_and_sockaddr* xhost2sockaddr(const char *host, int port) FAST_FUNC RETURNS_MALLOC;
553	len_and_sockaddr* xdotted2sockaddr(const char *host, int port) FAST_FUNC RETURNS_MALLOC;
554	/* Same, useful if you want to force family (e.g. IPv6) */
555	#if !ENABLE_FEATURE_IPV6
556	#define host_and_af2sockaddr(host, port, af) host2sockaddr((host), (port))
557	#define xhost_and_af2sockaddr(host, port, af) xhost2sockaddr((host), (port))
558	#else
559	len_and_sockaddr* host_and_af2sockaddr(const char *host, int port, sa_family_t af) FAST_FUNC RETURNS_MALLOC;
560	len_and_sockaddr* xhost_and_af2sockaddr(const char *host, int port, sa_family_t af) FAST_FUNC RETURNS_MALLOC;
561	#endif
562	/* Assign sin[6]_port member if the socket is an AF_INET[6] one,
563	* otherwise no-op. Useful for ftp.
564	* NB: does NOT do htons() internally, just direct assignment. */
565	void set_nport(len_and_sockaddr *lsa, unsigned port) FAST_FUNC;
566	/* Retrieve sin[6]_port or return -1 for non-INET[6] lsa's */
567	int get_nport(const struct sockaddr *sa) FAST_FUNC;
568	/* Reverse DNS. Returns NULL on failure. */
569	char* xmalloc_sockaddr2host(const struct sockaddr *sa) FAST_FUNC RETURNS_MALLOC;
570	/* This one doesn't append :PORTNUM */
571	char* xmalloc_sockaddr2host_noport(const struct sockaddr *sa) FAST_FUNC RETURNS_MALLOC;
572	/* This one also doesn't fall back to dotted IP (returns NULL) */
573	char* xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa) FAST_FUNC RETURNS_MALLOC;
574	/* inet_[ap]ton on steroids */
575	char* xmalloc_sockaddr2dotted(const struct sockaddr *sa) FAST_FUNC RETURNS_MALLOC;
576	char* xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa) FAST_FUNC RETURNS_MALLOC;
577	// "old" (ipv4 only) API
578	// users: traceroute.c hostname.c - use _list_ of all IPs
579	struct hostent xgethostbyname(const char name) FAST_FUNC;
580	// Also mount.c and inetd.c are using gethostbyname(),
581	// + inet_common.c has additional IPv4-only stuff
582
583
584	void socket_want_pktinfo(int fd) FAST_FUNC;
585	ssize_t send_to_from(int fd, void *buf, size_t len, int flags,
586	const struct sockaddr *to,
587	const struct sockaddr *from,
588	socklen_t tolen) FAST_FUNC;
589	ssize_t recv_from_to(int fd, void *buf, size_t len, int flags,
590	struct sockaddr *from,
591	struct sockaddr *to,
592	socklen_t sa_size) FAST_FUNC;
593
594
595	char xstrdup(const char s) FAST_FUNC RETURNS_MALLOC;
596	char xstrndup(const char s, int n) FAST_FUNC RETURNS_MALLOC;
597	void overlapping_strcpy(char dst, const char src) FAST_FUNC;
598	char safe_strncpy(char dst, const char *src, size_t size) FAST_FUNC;
599	char strncpy_IFNAMSIZ(char dst, const char *src) FAST_FUNC;
600	/* Guaranteed to NOT be a macro (smallest code). Saves nearly 2k on uclibc.
601	* But potentially slow, don't use in one-billion-times loops */
602	int bb_putchar(int ch) FAST_FUNC;
603	/* Note: does not use stdio, writes to fd 2 directly */
604	int bb_putchar_stderr(char ch) FAST_FUNC;
605	char xasprintf(const char format, ...) __attribute__ ((format(printf, 1, 2))) FAST_FUNC RETURNS_MALLOC;
606	// gcc-4.1.1 still isn't good enough at optimizing it
607	// (+200 bytes compared to macro)
608	//static ALWAYS_INLINE
609	//int LONE_DASH(const char *s) { return s[0] == '-' && !s[1]; }
610	//static ALWAYS_INLINE
611	//int NOT_LONE_DASH(const char *s) { return s[0] != '-' \|\| s[1]; }
612	#define LONE_DASH(s) ((s)[0] == '-' && !(s)[1])
613	#define NOT_LONE_DASH(s) ((s)[0] != '-' \|\| (s)[1])
614	#define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
615	#define NOT_LONE_CHAR(s,c) ((s)[0] != (c) \|\| (s)[1])
616	#define DOT_OR_DOTDOT(s) ((s)[0] == '.' && (!(s)[1] \|\| ((s)[1] == '.' && !(s)[2])))
617
618	typedef struct uni_stat_t {
619	unsigned byte_count;
620	unsigned unicode_count;
621	unsigned unicode_width;
622	} uni_stat_t;
623	/* Returns a string with unprintable chars replaced by '?' or
624	* SUBST_WCHAR. This function is unicode-aware. */
625	const char* FAST_FUNC printable_string(uni_stat_t stats, const char str);
626	/* Prints unprintable char ch as ^C or M-c to file
627	* (M-c is used only if ch is ORed with PRINTABLE_META),
628	* else it is printed as-is (except for ch = 0x9b) */
629	enum { PRINTABLE_META = 0x100 };
630	void fputc_printable(int ch, FILE *file) FAST_FUNC;
631
632	/* dmalloc will redefine these to it's own implementation. It is safe
633	* to have the prototypes here unconditionally. */
634	void *malloc_or_warn(size_t size) FAST_FUNC RETURNS_MALLOC;
635	void *xmalloc(size_t size) FAST_FUNC RETURNS_MALLOC;
636	void *xzalloc(size_t size) FAST_FUNC RETURNS_MALLOC;
637	void xrealloc(void old, size_t size) FAST_FUNC;
638	/* After xrealloc_vector(v, 4, idx) it's ok to use
639	* at least v[idx] and v[idx+1], for all idx values.
640	* shift specifies how many new elements are added (1: 2, 2: 4... 8: 256...)
641	* when all elements are used up. New elements are zeroed out. */
642	#define xrealloc_vector(vector, shift, idx) \
643	xrealloc_vector_helper((vector), (sizeof((vector)[0]) << 8) + (shift), (idx))
644	void* xrealloc_vector_helper(void *vector, unsigned sizeof_and_shift, int idx) FAST_FUNC;
645
646
647	extern ssize_t safe_read(int fd, void *buf, size_t count) FAST_FUNC;
648	extern ssize_t nonblock_safe_read(int fd, void *buf, size_t count) FAST_FUNC;
649	// NB: will return short read on error, not -1,
650	// if some data was read before error occurred
651	extern ssize_t full_read(int fd, void *buf, size_t count) FAST_FUNC;
652	extern void xread(int fd, void *buf, size_t count) FAST_FUNC;
653	extern unsigned char xread_char(int fd) FAST_FUNC;
654	extern ssize_t read_close(int fd, void *buf, size_t maxsz) FAST_FUNC;
655	extern ssize_t open_read_close(const char filename, void buf, size_t maxsz) FAST_FUNC;
656	// Reads one line a-la fgets (but doesn't save terminating '\n').
657	// Reads byte-by-byte. Useful when it is important to not read ahead.
658	// Bytes are appended to pfx (which must be malloced, or NULL).
659	extern char xmalloc_reads(int fd, char pfx, size_t *maxsz_p) FAST_FUNC;
660	/* Reads block up to maxsz_p (default: INT_MAX - 4095) /
661	extern void xmalloc_read(int fd, size_t maxsz_p) FAST_FUNC RETURNS_MALLOC;
662	/* Returns NULL if file can't be opened (default max size: INT_MAX - 4095) */
663	extern void xmalloc_open_read_close(const char filename, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
664	/* Autodetects gzip/bzip2 formats. fd may be in the middle of the file! */
665	#if ENABLE_FEATURE_SEAMLESS_LZMA \
666	\|\| ENABLE_FEATURE_SEAMLESS_BZ2 \
667	\|\| ENABLE_FEATURE_SEAMLESS_GZ \
668	/* \|\| ENABLE_FEATURE_SEAMLESS_Z */
669	extern void setup_unzip_on_fd(int fd /, int fail_if_not_detected/) FAST_FUNC;
670	#else
671	# define setup_unzip_on_fd(...) ((void)0)
672	#endif
673	/* Autodetects .gz etc */
674	extern int open_zipped(const char *fname) FAST_FUNC;
675	extern void xmalloc_open_zipped_read_close(const char fname, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
676	/* Never returns NULL */
677	extern void xmalloc_xopen_read_close(const char filename, size_t *maxsz_p) FAST_FUNC RETURNS_MALLOC;
678
679	extern ssize_t safe_write(int fd, const void *buf, size_t count) FAST_FUNC;
680	// NB: will return short write on error, not -1,
681	// if some data was written before error occurred
682	extern ssize_t full_write(int fd, const void *buf, size_t count) FAST_FUNC;
683	extern void xwrite(int fd, const void *buf, size_t count) FAST_FUNC;
684	extern void xwrite_str(int fd, const char *str) FAST_FUNC;
685	extern ssize_t full_write1_str(const char *str) FAST_FUNC;
686	extern ssize_t full_write2_str(const char *str) FAST_FUNC;
687	extern void xopen_xwrite_close(const char* file, const char *str) FAST_FUNC;
688
689	/* Close fd, but check for failures (some types of write errors) */
690	extern void xclose(int fd) FAST_FUNC;
691
692	/* Reads and prints to stdout till eof, then closes FILE. Exits on error: */
693	extern void xprint_and_close_file(FILE *file) FAST_FUNC;
694
695	extern char bb_get_chunk_from_file(FILE file, int *end) FAST_FUNC;
696	extern char bb_get_chunk_with_continuation(FILE file, int end, int lineno) FAST_FUNC;
697	/* Reads up to (and including) TERMINATING_STRING: */
698	extern char xmalloc_fgets_str(FILE file, const char *terminating_string) FAST_FUNC RETURNS_MALLOC;
699	/* Same, with limited max size, and returns the length (excluding NUL): */
700	extern char xmalloc_fgets_str_len(FILE file, const char terminating_string, size_t maxsz_p) FAST_FUNC RETURNS_MALLOC;
701	/* Chops off TERMINATING_STRING from the end: */
702	extern char xmalloc_fgetline_str(FILE file, const char *terminating_string) FAST_FUNC RETURNS_MALLOC;
703	/* Reads up to (and including) "\n" or NUL byte: */
704	extern char xmalloc_fgets(FILE file) FAST_FUNC RETURNS_MALLOC;
705	/* Chops off '\n' from the end, unlike fgets: */
706	extern char xmalloc_fgetline(FILE file) FAST_FUNC RETURNS_MALLOC;
707	/* Same, but doesn't try to conserve space (may have some slack after the end) */
708	/* extern char xmalloc_fgetline_fast(FILE file) FAST_FUNC RETURNS_MALLOC; */
709
710	void die_if_ferror(FILE file, const char msg) FAST_FUNC;
711	void die_if_ferror_stdout(void) FAST_FUNC;
712	int fflush_all(void) FAST_FUNC;
713	void fflush_stdout_and_exit(int retval) NORETURN FAST_FUNC;
714	int fclose_if_not_stdin(FILE *file) FAST_FUNC;
715	FILE* xfopen(const char filename, const char mode) FAST_FUNC;
716	/* Prints warning to stderr and returns NULL on failure: */
717	FILE* fopen_or_warn(const char filename, const char mode) FAST_FUNC;
718	/* "Opens" stdin if filename is special, else just opens file: */
719	FILE* xfopen_stdin(const char *filename) FAST_FUNC;
720	FILE* fopen_or_warn_stdin(const char *filename) FAST_FUNC;
721	FILE* fopen_for_read(const char *path) FAST_FUNC;
722	FILE* xfopen_for_read(const char *path) FAST_FUNC;
723	FILE* fopen_for_write(const char *path) FAST_FUNC;
724	FILE* xfopen_for_write(const char *path) FAST_FUNC;
725	FILE* xfdopen_for_read(int fd) FAST_FUNC;
726	FILE* xfdopen_for_write(int fd) FAST_FUNC;
727
728	int bb_pstrcmp(const void a, const void b) /* not FAST_FUNC! */;
729	void qsort_string_vector(char **sv, unsigned count) FAST_FUNC;
730
731	/* Wrapper which restarts poll on EINTR or ENOMEM.
732	* On other errors complains [perror("poll")] and returns.
733	* Warning! May take (much) longer than timeout_ms to return!
734	* If this is a problem, use bare poll and open-code EINTR/ENOMEM handling */
735	int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout_ms) FAST_FUNC;
736
737	char *safe_gethostname(void) FAST_FUNC;
738	char *safe_getdomainname(void) FAST_FUNC;
739
740	/* Convert each alpha char in str to lower-case */
741	char* str_tolower(char *str) FAST_FUNC;
742
743	char *utoa(unsigned n) FAST_FUNC;
744	char *itoa(int n) FAST_FUNC;
745	/* Returns a pointer past the formatted number, does NOT null-terminate */
746	char utoa_to_buf(unsigned n, char buf, unsigned buflen) FAST_FUNC;
747	char itoa_to_buf(int n, char buf, unsigned buflen) FAST_FUNC;
748	/* Intelligent formatters of bignums */
749	void smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale) FAST_FUNC;
750	void smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
751	/* If block_size == 0, display size without fractional part,
752	* else display (size * block_size) with one decimal digit.
753	* If display_unit == 0, show value no bigger than 1024 with suffix (K,M,G...),
754	* else divide by display_unit and do not use suffix. */
755	#define HUMAN_READABLE_MAX_WIDTH 7 /* "1024.0G" */
756	#define HUMAN_READABLE_MAX_WIDTH_STR "7"
757	//TODO: provide pointer to buf (avoid statics)?
758	const char *make_human_readable_str(unsigned long long size,
759	unsigned long block_size, unsigned long display_unit) FAST_FUNC;
760	/* Put a string of hex bytes ("1b2e66fe"...), return advanced pointer */
761	char bin2hex(char buf, const char *cp, int count) FAST_FUNC;
762	/* Reverse */
763	char* hex2bin(char dst, const char str, int count) FAST_FUNC;
764
765	/* Generate a UUID */
766	void generate_uuid(uint8_t *buf) FAST_FUNC;
767
768	/* Last element is marked by mult == 0 */
769	struct suffix_mult {
770	char suffix[4];
771	unsigned mult;
772	};
773	#include "xatonum.h"
774	/* Specialized: */
775
776	/* Using xatoi() instead of naive atoi() is not always convenient -
777	* in many places people want non-negative values, but store them
778	* in signed int. Therefore we need this one:
779	* dies if input is not in [0, INT_MAX] range. Also will reject '-0' etc.
780	* It should really be named xatoi_nonnegative (since it allows 0),
781	* but that would be too long.
782	*/
783	int xatoi_positive(const char *numstr) FAST_FUNC;
784
785	/* Useful for reading port numbers */
786	uint16_t xatou16(const char *numstr) FAST_FUNC;
787
788
789	/* These parse entries in /etc/passwd and /etc/group. This is desirable
790	* for BusyBox since we want to avoid using the glibc NSS stuff, which
791	* increases target size and is often not needed on embedded systems. */
792	long xuname2uid(const char *name) FAST_FUNC;
793	long xgroup2gid(const char *name) FAST_FUNC;
794	/* wrapper: allows string to contain numeric uid or gid */
795	unsigned long get_ug_id(const char s, long FAST_FUNC (xname2id)(const char *)) FAST_FUNC;
796	/* from chpst. Does not die, returns 0 on failure */
797	struct bb_uidgid_t {
798	uid_t uid;
799	gid_t gid;
800	};
801	/* always sets uid and gid */
802	int get_uidgid(struct bb_uidgid_t, const char, int numeric_ok) FAST_FUNC;
803	/* always sets uid and gid, allows numeric; exits on failure */
804	void xget_uidgid(struct bb_uidgid_t, const char) FAST_FUNC;
805	/* chown-like handling of "user[:[group]" */
806	void parse_chown_usergroup_or_die(struct bb_uidgid_t u, char user_group) FAST_FUNC;
807	struct passwd* xgetpwnam(const char *name) FAST_FUNC;
808	struct group* xgetgrnam(const char *name) FAST_FUNC;
809	struct passwd* xgetpwuid(uid_t uid) FAST_FUNC;
810	struct group* xgetgrgid(gid_t gid) FAST_FUNC;
811	char* xuid2uname(uid_t uid) FAST_FUNC;
812	char* xgid2group(gid_t gid) FAST_FUNC;
813	char* uid2uname(uid_t uid) FAST_FUNC;
814	char* gid2group(gid_t gid) FAST_FUNC;
815	char* uid2uname_utoa(long uid) FAST_FUNC;
816	char* gid2group_utoa(long gid) FAST_FUNC;
817	/* versions which cache results (useful for ps, ls etc) */
818	const char* get_cached_username(uid_t uid) FAST_FUNC;
819	const char* get_cached_groupname(gid_t gid) FAST_FUNC;
820	void clear_username_cache(void) FAST_FUNC;
821	/* internally usernames are saved in fixed-sized char[] buffers */
822	enum { USERNAME_MAX_SIZE = 16 - sizeof(int) };
823	#if ENABLE_FEATURE_CHECK_NAMES
824	void die_if_bad_username(const char* name) FAST_FUNC;
825	#else
826	#define die_if_bad_username(name) ((void)(name))
827	#endif
828
829	#if ENABLE_FEATURE_UTMP
830	void FAST_FUNC write_new_utmp(pid_t pid, int new_type, const char tty_name, const char username, const char *hostname);
831	void FAST_FUNC update_utmp(pid_t pid, int new_type, const char tty_name, const char username, const char *hostname);
832	#else
833	# define write_new_utmp(pid, new_type, tty_name, username, hostname) ((void)0)
834	# define update_utmp(pid, new_type, tty_name, username, hostname) ((void)0)
835	#endif
836
837	int execable_file(const char *name) FAST_FUNC;
838	char find_execable(const char filename, char **PATHp) FAST_FUNC;
839	int exists_execable(const char *filename) FAST_FUNC;
840
841	/* BB_EXECxx always execs (it's not doing NOFORK/NOEXEC stuff),
842	* but it may exec busybox and call applet instead of searching PATH.
843	*/
844	#if ENABLE_FEATURE_PREFER_APPLETS
845	int bb_execvp(const char file, char const argv[]) FAST_FUNC;
846	#define BB_EXECVP(prog,cmd) bb_execvp(prog,cmd)
847	#define BB_EXECLP(prog,cmd,...) \
848	execlp((find_applet_by_name(prog) >= 0) ? CONFIG_BUSYBOX_EXEC_PATH : prog, \
849	cmd, __VA_ARGS__)
850	#else
851	#define BB_EXECVP(prog,cmd) execvp(prog,cmd)
852	#define BB_EXECLP(prog,cmd,...) execlp(prog,cmd, __VA_ARGS__)
853	#endif
854	int BB_EXECVP_or_die(char **argv) NORETURN FAST_FUNC;
855
856	/* xvfork() can't be a _function_, return after vfork mangles stack
857	* in the parent. It must be a macro. */
858	#define xvfork() \
859	({ \
860	pid_t bb__xvfork_pid = vfork(); \
861	if (bb__xvfork_pid < 0) \
862	bb_perror_msg_and_die("vfork"); \
863	bb__xvfork_pid; \
864	})
865	#if BB_MMU
866	pid_t xfork(void) FAST_FUNC;
867	#endif
868
869	/* NOMMU friendy fork+exec: */
870	pid_t spawn(char **argv) FAST_FUNC;
871	pid_t xspawn(char **argv) FAST_FUNC;
872
873	pid_t safe_waitpid(pid_t pid, int *wstat, int options) FAST_FUNC;
874	pid_t wait_any_nohang(int *wstat) FAST_FUNC;
875	/* wait4pid: unlike waitpid, waits ONLY for one process.
876	* Returns sig + 0x180 if child is killed by signal.
877	* It's safe to pass negative 'pids' from failed [v]fork -
878	* wait4pid will return -1 (and will not clobber [v]fork's errno).
879	* IOW: rc = wait4pid(spawn(argv));
880	* if (rc < 0) bb_perror_msg("%s", argv[0]);
881	* if (rc > 0) bb_error_msg("exit code: %d", rc & 0xff);
882	*/
883	int wait4pid(pid_t pid) FAST_FUNC;
884	/* Same as wait4pid(spawn(argv)), but with NOFORK/NOEXEC if configured: */
885	int spawn_and_wait(char **argv) FAST_FUNC;
886	struct nofork_save_area {
887	jmp_buf die_jmp;
888	const char *applet_name;
889	uint32_t option_mask32;
890	int die_sleep;
891	uint8_t xfunc_error_retval;
892	smallint saved;
893	};
894	void save_nofork_data(struct nofork_save_area *save) FAST_FUNC;
895	void restore_nofork_data(struct nofork_save_area *save) FAST_FUNC;
896	/* Does NOT check that applet is NOFORK, just blindly runs it */
897	int run_nofork_applet(int applet_no, char **argv) FAST_FUNC;
898	int run_nofork_applet_prime(struct nofork_save_area old, int applet_no, char *argv) FAST_FUNC;
899
900	/* Helpers for daemonization.
901	*
902	* bb_daemonize(flags) = daemonize, does not compile on NOMMU
903	*
904	* bb_daemonize_or_rexec(flags, argv) = daemonizes on MMU (and ignores argv),
905	* rexec's itself on NOMMU with argv passed as command line.
906	* Thus bb_daemonize_or_rexec may cause your <applet>_main() to be re-executed
907	* from the start. (It will detect it and not reexec again second time).
908	* You have to audit carefully that you don't do something twice as a result
909	* (opening files/sockets, parsing config files etc...)!
910	*
911	* Both of the above will redirect fd 0,1,2 to /dev/null and drop ctty
912	* (will do setsid()).
913	*
914	* fork_or_rexec(argv) = bare-bones fork on MMU,
915	* "vfork + re-exec ourself" on NOMMU. No fd redirection, no setsid().
916	* On MMU ignores argv.
917	*
918	* Helper for network daemons in foreground mode:
919	*
920	* bb_sanitize_stdio() = make sure that fd 0,1,2 are opened by opening them
921	* to /dev/null if they are not.
922	*/
923	enum {
924	DAEMON_CHDIR_ROOT = 1,
925	DAEMON_DEVNULL_STDIO = 2,
926	DAEMON_CLOSE_EXTRA_FDS = 4,
927	DAEMON_ONLY_SANITIZE = 8, /* internal use */
928	};
929	#if BB_MMU
930	enum { re_execed = 0 };
931	# define fork_or_rexec(argv) xfork()
932	# define bb_daemonize_or_rexec(flags, argv) bb_daemonize_or_rexec(flags)
933	# define bb_daemonize(flags) bb_daemonize_or_rexec(flags, bogus)
934	#else
935	extern bool re_execed;
936	void re_exec(char **argv) NORETURN FAST_FUNC;
937	pid_t fork_or_rexec(char **argv) FAST_FUNC;
938	int BUG_fork_is_unavailable_on_nommu(void) FAST_FUNC;
939	int BUG_daemon_is_unavailable_on_nommu(void) FAST_FUNC;
940	void BUG_bb_daemonize_is_unavailable_on_nommu(void) FAST_FUNC;
941	# define fork() BUG_fork_is_unavailable_on_nommu()
942	# define xfork() BUG_fork_is_unavailable_on_nommu()
943	# define daemon(a,b) BUG_daemon_is_unavailable_on_nommu()
944	# define bb_daemonize(a) BUG_bb_daemonize_is_unavailable_on_nommu()
945	#endif
946	void bb_daemonize_or_rexec(int flags, char **argv) FAST_FUNC;
947	void bb_sanitize_stdio(void) FAST_FUNC;
948	/* Clear dangerous stuff, set PATH. Return 1 if was run by different user. */
949	int sanitize_env_if_suid(void) FAST_FUNC;
950
951
952	char* single_argv(char **argv) FAST_FUNC;
953	extern const char const bb_argv_dash[]; / "-", NULL */
954	extern const char *opt_complementary;
955	#if ENABLE_LONG_OPTS \|\| ENABLE_FEATURE_GETOPT_LONG
956	#define No_argument "\0"
957	#define Required_argument "\001"
958	#define Optional_argument "\002"
959	extern const char *applet_long_options;
960	#endif
961	extern uint32_t option_mask32;
962	extern uint32_t getopt32(char *argv, const char applet_opts, ...) FAST_FUNC;
963
964
965	typedef struct llist_t {
966	char *data;
967	struct llist_t *link;
968	} llist_t;
969	void llist_add_to(llist_t *old_head, void data) FAST_FUNC;
970	void llist_add_to_end(llist_t *list_head, void data) FAST_FUNC;
971	void llist_pop(llist_t *elm) FAST_FUNC;
972	void llist_unlink(llist_t *head, llist_t elm) FAST_FUNC;
973	void llist_free(llist_t elm, void (freeit)(void *data)) FAST_FUNC;
974	llist_t llist_rev(llist_t list) FAST_FUNC;
975	llist_t llist_find_str(llist_t first, const char *str) FAST_FUNC;
976	/* BTW, surprisingly, changing API to
977	* llist_t llist_add_to(llist_t old_head, void *data)
978	* etc does not result in smaller code... */
979
980	/* start_stop_daemon and udhcpc are special - they want
981	* to create pidfiles regardless of FEATURE_PIDFILE */
982	#if ENABLE_FEATURE_PIDFILE \|\| defined(WANT_PIDFILE)
983	/* True only if we created pidfile which is file, not /dev/null etc */
984	extern smallint wrote_pidfile;
985	void write_pidfile(const char *path) FAST_FUNC;
986	#define remove_pidfile(path) do { if (wrote_pidfile) unlink(path); } while (0)
987	#else
988	enum { wrote_pidfile = 0 };
989	#define write_pidfile(path) ((void)0)
990	#define remove_pidfile(path) ((void)0)
991	#endif
992
993	enum {
994	LOGMODE_NONE = 0,
995	LOGMODE_STDIO = (1 << 0),
996	LOGMODE_SYSLOG = (1 << 1) * ENABLE_FEATURE_SYSLOG,
997	LOGMODE_BOTH = LOGMODE_SYSLOG + LOGMODE_STDIO,
998	};
999	extern const char *msg_eol;
1000	extern smallint logmode;
1001	extern int die_sleep;
1002	extern uint8_t xfunc_error_retval;
1003	extern jmp_buf die_jmp;
1004	extern void xfunc_die(void) NORETURN FAST_FUNC;
1005	extern void bb_show_usage(void) NORETURN FAST_FUNC;
1006	extern void bb_error_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
1007	extern void bb_error_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2))) FAST_FUNC;
1008	extern void bb_perror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
1009	extern void bb_simple_perror_msg(const char *s) FAST_FUNC;
1010	extern void bb_perror_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2))) FAST_FUNC;
1011	extern void bb_simple_perror_msg_and_die(const char *s) NORETURN FAST_FUNC;
1012	extern void bb_herror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
1013	extern void bb_herror_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2))) FAST_FUNC;
1014	extern void bb_perror_nomsg_and_die(void) NORETURN FAST_FUNC;
1015	extern void bb_perror_nomsg(void) FAST_FUNC;
1016	extern void bb_info_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
1017	extern void bb_verror_msg(const char s, va_list p, const char strerr) FAST_FUNC;
1018
1019	/* We need to export XXX_main from libbusybox
1020	* only if we build "individual" binaries
1021	*/
1022	#if ENABLE_FEATURE_INDIVIDUAL
1023	#define MAIN_EXTERNALLY_VISIBLE EXTERNALLY_VISIBLE
1024	#else
1025	#define MAIN_EXTERNALLY_VISIBLE
1026	#endif
1027
1028
1029	/* Applets which are useful from another applets */
1030	int bb_cat(char** argv);
1031	/* If shell needs them, they exist even if not enabled as applets */
1032	int echo_main(int argc, char** argv) IF_ECHO(MAIN_EXTERNALLY_VISIBLE);
1033	int printf_main(int argc, char **argv) IF_PRINTF(MAIN_EXTERNALLY_VISIBLE);
1034	int test_main(int argc, char **argv) IF_TEST(MAIN_EXTERNALLY_VISIBLE);
1035	int kill_main(int argc, char **argv) IF_KILL(MAIN_EXTERNALLY_VISIBLE);
1036	/* Similar, but used by chgrp, not shell */
1037	int chown_main(int argc, char **argv) IF_CHOWN(MAIN_EXTERNALLY_VISIBLE);
1038	/* Used by ftpd */
1039	int ls_main(int argc, char **argv) IF_LS(MAIN_EXTERNALLY_VISIBLE);
1040	/* Don't need IF_xxx() guard for these */
1041	int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1042	int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1043
1044	#if ENABLE_ROUTE
1045	void bb_displayroutes(int noresolve, int netstatfmt) FAST_FUNC;
1046	#endif
1047
1048
1049	/* Networking */
1050	int create_icmp_socket(void) FAST_FUNC;
1051	int create_icmp6_socket(void) FAST_FUNC;
1052	/* interface.c */
1053	/* This structure defines protocol families and their handlers. */
1054	struct aftype {
1055	const char *name;
1056	const char *title;
1057	int af;
1058	int alen;
1059	char* FAST_FUNC (print)(unsigned char );
1060	const char* FAST_FUNC (sprint)(struct sockaddr , int numeric);
1061	int FAST_FUNC (input)(/int type,/ const char bufp, struct sockaddr *);
1062	void FAST_FUNC (herror)(char text);
1063	int FAST_FUNC (*rprint)(int options);
1064	int FAST_FUNC (rinput)(int typ, int ext, char *argv);
1065	/* may modify src */
1066	int FAST_FUNC (getmask)(char src, struct sockaddr mask, char name);
1067	};
1068	/* This structure defines hardware protocols and their handlers. */
1069	struct hwtype {
1070	const char *name;
1071	const char *title;
1072	int type;
1073	int alen;
1074	char* FAST_FUNC (print)(unsigned char );
1075	int FAST_FUNC (input)(const char , struct sockaddr *);
1076	int FAST_FUNC (*activate)(int fd);
1077	int suppress_null_addr;
1078	};
1079	extern smallint interface_opt_a;
1080	int display_interfaces(char *ifname) FAST_FUNC;
1081	#if ENABLE_FEATURE_HWIB
1082	int in_ib(const char bufp, struct sockaddr sap) FAST_FUNC;
1083	#else
1084	#define in_ib(a, b) 1 /* fail */
1085	#endif
1086	const struct aftype get_aftype(const char name) FAST_FUNC;
1087	const struct hwtype get_hwtype(const char name) FAST_FUNC;
1088	const struct hwtype *get_hwntype(int type) FAST_FUNC;
1089
1090
1091	#ifndef BUILD_INDIVIDUAL
1092	extern int find_applet_by_name(const char *name) FAST_FUNC;
1093	/* Returns only if applet is not found. */
1094	extern void run_applet_and_exit(const char name, char *argv) FAST_FUNC;
1095	extern void run_applet_no_and_exit(int a, char **argv) NORETURN FAST_FUNC;
1096	#endif
1097
1098	#ifdef HAVE_MNTENT_H
1099	extern int match_fstype(const struct mntent mt, const char fstypes) FAST_FUNC;
1100	extern struct mntent find_mount_point(const char name, int subdir_too) FAST_FUNC;
1101	#endif
1102	extern void erase_mtab(const char * name) FAST_FUNC;
1103	extern unsigned int tty_baud_to_value(speed_t speed) FAST_FUNC;
1104	extern speed_t tty_value_to_baud(unsigned int value) FAST_FUNC;
1105	#if ENABLE_DESKTOP
1106	extern void bb_warn_ignoring_args(char *arg) FAST_FUNC;
1107	#else
1108	# define bb_warn_ignoring_args(arg) ((void)0)
1109	#endif
1110
1111	extern int get_linux_version_code(void) FAST_FUNC;
1112
1113	extern char query_loop(const char device) FAST_FUNC;
1114	extern int del_loop(const char *device) FAST_FUNC;
1115	/* If *devname is not NULL, use that name, otherwise try to find free one,
1116	* malloc and return it in *devname.
1117	* return value: 1: read-only loopdev was setup, 0: rw, < 0: error */
1118	extern int set_loop(char *devname, const char file, unsigned long long offset) FAST_FUNC;
1119
1120	/* Like bb_ask below, but asks on stdin with no timeout. */
1121	char bb_ask_stdin(const char prompt) FAST_FUNC;
1122	//TODO: pass buf pointer or return allocated buf (avoid statics)?
1123	char bb_ask(const int fd, int timeout, const char prompt) FAST_FUNC;
1124	int bb_ask_confirmation(void) FAST_FUNC;
1125
1126	int bb_parse_mode(const char* s, mode_t* theMode) FAST_FUNC;
1127
1128	/*
1129	* Config file parser
1130	*/
1131	enum {
1132	PARSE_COLLAPSE = 0x00010000, // treat consecutive delimiters as one
1133	PARSE_TRIM = 0x00020000, // trim leading and trailing delimiters
1134	// TODO: COLLAPSE and TRIM seem to always go in pair
1135	PARSE_GREEDY = 0x00040000, // last token takes entire remainder of the line
1136	PARSE_MIN_DIE = 0x00100000, // die if < min tokens found
1137	// keep a copy of current line
1138	PARSE_KEEP_COPY = 0x00200000 * ENABLE_FEATURE_CROND_D,
1139	// PARSE_ESCAPE = 0x00400000, // process escape sequences in tokens
1140	// NORMAL is:
1141	// * remove leading and trailing delimiters and collapse
1142	// multiple delimiters into one
1143	// * warn and continue if less than mintokens delimiters found
1144	// * grab everything into last token
1145	PARSE_NORMAL = PARSE_COLLAPSE \| PARSE_TRIM \| PARSE_GREEDY,
1146	};
1147	typedef struct parser_t {
1148	FILE *fp;
1149	char *line;
1150	char *data;
1151	int lineno;
1152	} parser_t;
1153	parser_t* config_open(const char *filename) FAST_FUNC;
1154	parser_t* config_open2(const char filename, FILE FAST_FUNC (fopen_func)(const char path)) FAST_FUNC;
1155	/* delims[0] is a comment char (use '\0' to disable), the rest are token delimiters */
1156	int config_read(parser_t parser, char tokens, unsigned flags, const char delims) FAST_FUNC;
1157	#define config_read(parser, tokens, max, min, str, flags) \
1158	config_read(parser, tokens, ((flags) \| (((min) & 0xFF) << 8) \| ((max) & 0xFF)), str)
1159	void config_close(parser_t *parser) FAST_FUNC;
1160
1161	/* Concatenate path and filename to new allocated buffer.
1162	* Add "/" only as needed (no duplicate "//" are produced).
1163	* If path is NULL, it is assumed to be "/".
1164	* filename should not be NULL. */
1165	char concat_path_file(const char path, const char *filename) FAST_FUNC;
1166	char concat_subpath_file(const char path, const char *filename) FAST_FUNC;
1167	const char bb_basename(const char name) FAST_FUNC;
1168	/* NB: can violate const-ness (similarly to strchr) */
1169	char last_char_is(const char s, int c) FAST_FUNC;
1170
1171
1172	int bb_make_directory(char *path, long mode, int flags) FAST_FUNC;
1173
1174	int get_signum(const char *name) FAST_FUNC;
1175	const char *get_signame(int number) FAST_FUNC;
1176	void print_signames(void) FAST_FUNC;
1177
1178	char bb_simplify_path(const char path) FAST_FUNC;
1179	/* Returns ptr to NUL */
1180	char bb_simplify_abs_path_inplace(char path) FAST_FUNC;
1181
1182	#define FAIL_DELAY 3
1183	extern void bb_do_delay(int seconds) FAST_FUNC;
1184	extern void change_identity(const struct passwd *pw) FAST_FUNC;
1185	extern void run_shell(const char shell, int loginshell, const char command, const char **additional_args) NORETURN FAST_FUNC;
1186	#if ENABLE_SELINUX
1187	extern void renew_current_security_context(void) FAST_FUNC;
1188	extern void set_current_security_context(security_context_t sid) FAST_FUNC;
1189	extern context_t set_security_context_component(security_context_t cur_context,
1190	char user, char role, char type, char range) FAST_FUNC;
1191	extern void setfscreatecon_or_die(security_context_t scontext) FAST_FUNC;
1192	extern void selinux_preserve_fcontext(int fdesc) FAST_FUNC;
1193	#else
1194	#define selinux_preserve_fcontext(fdesc) ((void)0)
1195	#endif
1196	extern void selinux_or_die(void) FAST_FUNC;
1197
1198	/* setup_environment:
1199	* if chdir pw->pw_dir: ok: else if to_tmp == 1: goto /tmp else: goto / or die
1200	* if clear_env = 1: cd(pw->pw_dir), clear environment, then set
1201	* TERM=(old value)
1202	* USER=pw->pw_name, LOGNAME=pw->pw_name
1203	* PATH=bb_default_[root_]path
1204	* HOME=pw->pw_dir
1205	* SHELL=shell
1206	* else if change_env = 1:
1207	* if not root (if pw->pw_uid != 0):
1208	* USER=pw->pw_name, LOGNAME=pw->pw_name
1209	* HOME=pw->pw_dir
1210	* SHELL=shell
1211	* else does nothing
1212	*/
1213	#define SETUP_ENV_CHANGEENV (1 << 0)
1214	#define SETUP_ENV_CLEARENV (1 << 1)
1215	#define SETUP_ENV_TO_TMP (1 << 2)
1216	extern void setup_environment(const char shell, int flags, const struct passwd pw) FAST_FUNC;
1217	extern int correct_password(const struct passwd *pw) FAST_FUNC;
1218	/* Returns a malloced string */
1219	#if !ENABLE_USE_BB_CRYPT
1220	#define pw_encrypt(clear, salt, cleanup) pw_encrypt(clear, salt)
1221	#endif
1222	extern char pw_encrypt(const char clear, const char *salt, int cleanup) FAST_FUNC;
1223	extern int obscure(const char old, const char newval, const struct passwd *pwdp) FAST_FUNC;
1224	/* rnd is additional random input. New one is returned.
1225	* Useful if you call crypt_make_salt many times in a row:
1226	* rnd = crypt_make_salt(buf1, 4, 0);
1227	* rnd = crypt_make_salt(buf2, 4, rnd);
1228	* rnd = crypt_make_salt(buf3, 4, rnd);
1229	* (otherwise we risk having same salt generated)
1230	*/
1231	extern int crypt_make_salt(char *p, int cnt, int rnd) FAST_FUNC;
1232
1233	/* Returns number of lines changed, or -1 on error */
1234	#if !(ENABLE_FEATURE_ADDUSER_TO_GROUP \|\| ENABLE_FEATURE_DEL_USER_FROM_GROUP)
1235	#define update_passwd(filename, username, data, member) \
1236	update_passwd(filename, username, data)
1237	#endif
1238	extern int update_passwd(const char *filename,
1239	const char *username,
1240	const char *data,
1241	const char *member) FAST_FUNC;
1242
1243	int index_in_str_array(const char const string_array[], const char key) FAST_FUNC;
1244	int index_in_strings(const char strings, const char key) FAST_FUNC;
1245	int index_in_substr_array(const char const string_array[], const char key) FAST_FUNC;
1246	int index_in_substrings(const char strings, const char key) FAST_FUNC;
1247	const char nth_string(const char strings, int n) FAST_FUNC;
1248
1249	extern void print_login_issue(const char issue_file, const char tty) FAST_FUNC;
1250	extern void print_login_prompt(void) FAST_FUNC;
1251
1252	char *xmalloc_ttyname(int fd) FAST_FUNC RETURNS_MALLOC;
1253	/* NB: typically you want to pass fd 0, not 1. Think 'applet \| grep something' */
1254	int get_terminal_width_height(int fd, unsigned width, unsigned height) FAST_FUNC;
1255
1256	int tcsetattr_stdin_TCSANOW(const struct termios *tp) FAST_FUNC;
1257
1258	/* NB: "unsigned request" is crucial! "int request" will break some arches! */
1259	int ioctl_or_perror(int fd, unsigned request, void argp, const char fmt,...) __attribute__ ((format (printf, 4, 5))) FAST_FUNC;
1260	int ioctl_or_perror_and_die(int fd, unsigned request, void argp, const char fmt,...) __attribute__ ((format (printf, 4, 5))) FAST_FUNC;
1261	#if ENABLE_IOCTL_HEX2STR_ERROR
1262	int bb_ioctl_or_warn(int fd, unsigned request, void argp, const char ioctl_name) FAST_FUNC;
1263	int bb_xioctl(int fd, unsigned request, void argp, const char ioctl_name) FAST_FUNC;
1264	#define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp,#request)
1265	#define xioctl(fd,request,argp) bb_xioctl(fd,request,argp,#request)
1266	#else
1267	int bb_ioctl_or_warn(int fd, unsigned request, void *argp) FAST_FUNC;
1268	int bb_xioctl(int fd, unsigned request, void *argp) FAST_FUNC;
1269	#define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp)
1270	#define xioctl(fd,request,argp) bb_xioctl(fd,request,argp)
1271	#endif
1272
1273	char is_in_ino_dev_hashtable(const struct stat statbuf) FAST_FUNC;
1274	void add_to_ino_dev_hashtable(const struct stat statbuf, const char name) FAST_FUNC;
1275	void reset_ino_dev_hashtable(void) FAST_FUNC;
1276	#ifdef __GLIBC__
1277	/* At least glibc has horrendously large inline for this, so wrap it */
1278	unsigned long long bb_makedev(unsigned int major, unsigned int minor) FAST_FUNC;
1279	#undef makedev
1280	#define makedev(a,b) bb_makedev(a,b)
1281	#endif
1282
1283
1284	/* "Keycodes" that report an escape sequence.
1285	* We use something which fits into signed char,
1286	* yet doesn't represent any valid Unicode character.
1287	* Also, -1 is reserved for error indication and we don't use it. */
1288	enum {
1289	KEYCODE_UP = -2,
1290	KEYCODE_DOWN = -3,
1291	KEYCODE_RIGHT = -4,
1292	KEYCODE_LEFT = -5,
1293	KEYCODE_HOME = -6,
1294	KEYCODE_END = -7,
1295	KEYCODE_INSERT = -8,
1296	KEYCODE_DELETE = -9,
1297	KEYCODE_PAGEUP = -10,
1298	KEYCODE_PAGEDOWN = -11,
1299
1300	KEYCODE_CTRL_UP = KEYCODE_UP & ~0x40,
1301	KEYCODE_CTRL_DOWN = KEYCODE_DOWN & ~0x40,
1302	KEYCODE_CTRL_RIGHT = KEYCODE_RIGHT & ~0x40,
1303	KEYCODE_CTRL_LEFT = KEYCODE_LEFT & ~0x40,
1304	#if 0
1305	KEYCODE_FUN1 = -12,
1306	KEYCODE_FUN2 = -13,
1307	KEYCODE_FUN3 = -14,
1308	KEYCODE_FUN4 = -15,
1309	KEYCODE_FUN5 = -16,
1310	KEYCODE_FUN6 = -17,
1311	KEYCODE_FUN7 = -18,
1312	KEYCODE_FUN8 = -19,
1313	KEYCODE_FUN9 = -20,
1314	KEYCODE_FUN10 = -21,
1315	KEYCODE_FUN11 = -22,
1316	KEYCODE_FUN12 = -23,
1317	#endif
1318	KEYCODE_CURSOR_POS = -0x100, /* 0xfff..fff00 */
1319	/* How long is the longest ESC sequence we know?
1320	* We want it big enough to be able to contain
1321	* cursor position sequence "ESC [ 9999 ; 9999 R"
1322	*/
1323	KEYCODE_BUFFER_SIZE = 16
1324	};
1325	/* Note: fd may be in blocking or non-blocking mode, both make sense.
1326	* For one, less uses non-blocking mode.
1327	* Only the first read syscall inside read_key may block indefinitely
1328	* (unless fd is in non-blocking mode),
1329	* subsequent reads will time out after a few milliseconds.
1330	* Return of -1 means EOF or error (errno == 0 on EOF).
1331	* buffer[0] is used as a counter of buffered chars and must be 0
1332	* on first call.
1333	* timeout:
1334	* -2: do not poll for input;
1335	* -1: poll(-1) (i.e. block);
1336	* >=0: poll for TIMEOUT milliseconds, return -1/EAGAIN on timeout
1337	*/
1338	int64_t read_key(int fd, char *buffer, int timeout) FAST_FUNC;
1339	void read_key_ungets(char buffer, const char str, unsigned len) FAST_FUNC;
1340
1341
1342	#if ENABLE_FEATURE_EDITING
1343	/* It's NOT just ENABLEd or disabled. It's a number: */
1344	# ifdef CONFIG_FEATURE_EDITING_HISTORY
1345	# define MAX_HISTORY (CONFIG_FEATURE_EDITING_HISTORY + 0)
1346	# else
1347	# define MAX_HISTORY 0
1348	# endif
1349	typedef struct line_input_t {
1350	int flags;
1351	const char *path_lookup;
1352	# if MAX_HISTORY
1353	int cnt_history;
1354	int cur_history;
1355	# if ENABLE_FEATURE_EDITING_SAVEHISTORY
1356	unsigned cnt_history_in_file;
1357	const char *hist_file;
1358	# endif
1359	char *history[MAX_HISTORY + 1];
1360	# endif
1361	} line_input_t;
1362	enum {
1363	DO_HISTORY = 1 * (MAX_HISTORY > 0),
1364	SAVE_HISTORY = 2 * (MAX_HISTORY > 0) * ENABLE_FEATURE_EDITING_SAVEHISTORY,
1365	TAB_COMPLETION = 4 * ENABLE_FEATURE_TAB_COMPLETION,
1366	USERNAME_COMPLETION = 8 * ENABLE_FEATURE_USERNAME_COMPLETION,
1367	VI_MODE = 0x10 * ENABLE_FEATURE_EDITING_VI,
1368	WITH_PATH_LOOKUP = 0x20,
1369	FOR_SHELL = DO_HISTORY \| SAVE_HISTORY \| TAB_COMPLETION \| USERNAME_COMPLETION,
1370	};
1371	line_input_t *new_line_input_t(int flags) FAST_FUNC;
1372	/* So far static: void free_line_input_t(line_input_t n) FAST_FUNC; /
1373	/* maxsize must be >= 2.
1374	* Returns:
1375	* -1 on read errors or EOF, or on bare Ctrl-D,
1376	* 0 on ctrl-C (the line entered is still returned in 'command'),
1377	* >0 length of input string, including terminating '\n'
1378	*/
1379	int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *state) FAST_FUNC;
1380	#else
1381	#define MAX_HISTORY 0
1382	int read_line_input(const char* prompt, char* command, int maxsize) FAST_FUNC;
1383	#define read_line_input(prompt, command, maxsize, state) \
1384	read_line_input(prompt, command, maxsize)
1385	#endif
1386
1387
1388	#ifndef COMM_LEN
1389	# ifdef TASK_COMM_LEN
1390	enum { COMM_LEN = TASK_COMM_LEN };
1391	# else
1392	/* synchronize with sizeof(task_struct.comm) in /usr/include/linux/sched.h */
1393	enum { COMM_LEN = 16 };
1394	# endif
1395	#endif
1396
1397	struct smaprec {
1398	unsigned long mapped_rw;
1399	unsigned long mapped_ro;
1400	unsigned long shared_clean;
1401	unsigned long shared_dirty;
1402	unsigned long private_clean;
1403	unsigned long private_dirty;
1404	unsigned long stack;
1405	unsigned long smap_pss, smap_swap;
1406	unsigned long smap_size;
1407	unsigned long smap_start;
1408	char smap_mode[5];
1409	char *smap_name;
1410	};
1411
1412	#if !ENABLE_PMAP
1413	#define procps_read_smaps(pid, total, cb, data) \
1414	procps_read_smaps(pid, total)
1415	#endif
1416	int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
1417	void (cb)(struct smaprec , void ), void data);
1418
1419	typedef struct procps_status_t {
1420	DIR *dir;
1421	IF_FEATURE_SHOW_THREADS(DIR *task_dir;)
1422	uint8_t shift_pages_to_bytes;
1423	uint8_t shift_pages_to_kb;
1424	/* Fields are set to 0/NULL if failed to determine (or not requested) */
1425	uint16_t argv_len;
1426	char *argv0;
1427	char *exe;
1428	IF_SELINUX(char *context;)
1429	/* Everything below must contain no ptrs to malloc'ed data:
1430	* it is memset(0) for each process in procps_scan() */
1431	unsigned long vsz, rss; /* we round it to kbytes */
1432	unsigned long stime, utime;
1433	unsigned long start_time;
1434	unsigned pid;
1435	unsigned ppid;
1436	unsigned pgid;
1437	unsigned sid;
1438	unsigned uid;
1439	unsigned gid;
1440	#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
1441	unsigned ruid;
1442	unsigned rgid;
1443	int niceness;
1444	#endif
1445	unsigned tty_major,tty_minor;
1446	#if ENABLE_FEATURE_TOPMEM
1447	struct smaprec smaps;
1448	#endif
1449	char state[4];
1450	/* basename of executable in exec(2), read from /proc/N/stat
1451	* (if executable is symlink or script, it is NOT replaced
1452	* by link target or interpreter name) */
1453	char comm[COMM_LEN];
1454	/* user/group? - use passwd/group parsing functions */
1455	#if ENABLE_FEATURE_TOP_SMP_PROCESS
1456	int last_seen_on_cpu;
1457	#endif
1458	} procps_status_t;
1459	/* flag bits for procps_scan(xx, flags) calls */
1460	enum {
1461	PSSCAN_PID = 1 << 0,
1462	PSSCAN_PPID = 1 << 1,
1463	PSSCAN_PGID = 1 << 2,
1464	PSSCAN_SID = 1 << 3,
1465	PSSCAN_UIDGID = 1 << 4,
1466	PSSCAN_COMM = 1 << 5,
1467	/* PSSCAN_CMD = 1 << 6, - use read_cmdline instead */
1468	PSSCAN_ARGV0 = 1 << 7,
1469	PSSCAN_EXE = 1 << 8,
1470	PSSCAN_STATE = 1 << 9,
1471	PSSCAN_VSZ = 1 << 10,
1472	PSSCAN_RSS = 1 << 11,
1473	PSSCAN_STIME = 1 << 12,
1474	PSSCAN_UTIME = 1 << 13,
1475	PSSCAN_TTY = 1 << 14,
1476	PSSCAN_SMAPS = (1 << 15) * ENABLE_FEATURE_TOPMEM,
1477	/* NB: used by find_pid_by_name(). Any applet using it
1478	* needs to be mentioned here. */
1479	PSSCAN_ARGVN = (1 << 16) * (ENABLE_KILLALL
1480	\|\| ENABLE_PGREP \|\| ENABLE_PKILL
1481	\|\| ENABLE_PIDOF
1482	\|\| ENABLE_SESTATUS
1483	),
1484	PSSCAN_CONTEXT = (1 << 17) * ENABLE_SELINUX,
1485	PSSCAN_START_TIME = 1 << 18,
1486	PSSCAN_CPU = (1 << 19) * ENABLE_FEATURE_TOP_SMP_PROCESS,
1487	PSSCAN_NICE = (1 << 20) * ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS,
1488	PSSCAN_RUIDGID = (1 << 21) * ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS,
1489	PSSCAN_TASKS = (1 << 22) * ENABLE_FEATURE_SHOW_THREADS,
1490	/* These are all retrieved from proc/NN/stat in one go: */
1491	PSSCAN_STAT = PSSCAN_PPID \| PSSCAN_PGID \| PSSCAN_SID
1492	/**/ \| PSSCAN_COMM \| PSSCAN_STATE
1493	/**/ \| PSSCAN_VSZ \| PSSCAN_RSS
1494	/**/ \| PSSCAN_STIME \| PSSCAN_UTIME \| PSSCAN_START_TIME
1495	/**/ \| PSSCAN_TTY \| PSSCAN_NICE
1496	/**/ \| PSSCAN_CPU
1497	};
1498	//procps_status_t* alloc_procps_scan(void) FAST_FUNC;
1499	void free_procps_scan(procps_status_t* sp) FAST_FUNC;
1500	procps_status_t* procps_scan(procps_status_t* sp, int flags) FAST_FUNC;
1501	/* Format cmdline (up to col chars) into char buf[size] */
1502	/* Puts [comm] if cmdline is empty (-> process is a kernel thread) */
1503	void read_cmdline(char buf, int size, unsigned pid, const char comm) FAST_FUNC;
1504	pid_t find_pid_by_name(const char procName) FAST_FUNC;
1505	pid_t pidlist_reverse(pid_t pidList) FAST_FUNC;
1506	int starts_with_cpu(const char *str) FAST_FUNC;
1507	unsigned get_cpu_count(void) FAST_FUNC;
1508
1509
1510	extern const char bb_uuenc_tbl_base64[];
1511	extern const char bb_uuenc_tbl_std[];
1512	void bb_uuencode(char store, const void s, int length, const char *tbl) FAST_FUNC;
1513	enum {
1514	BASE64_FLAG_UU_STOP = 0x100,
1515	/* Sign-extends to a value which never matches fgetc result: */
1516	BASE64_FLAG_NO_STOP_CHAR = 0x80,
1517	};
1518	void FAST_FUNC read_base64(FILE src_stream, FILE dst_stream, int flags);
1519
1520	typedef struct md5_ctx_t {
1521	uint8_t wbuffer[64]; /* always correctly aligned for uint64_t */
1522	void (process_block)(struct md5_ctx_t) FAST_FUNC;
1523	uint64_t total64; /* must be directly before hash[] */
1524	uint32_t hash[8]; /* 4 elements for md5, 5 for sha1, 8 for sha256 */
1525	} md5_ctx_t;
1526	typedef struct md5_ctx_t sha1_ctx_t;
1527	typedef struct md5_ctx_t sha256_ctx_t;
1528	typedef struct sha512_ctx_t {
1529	uint64_t total64[2]; /* must be directly before hash[] */
1530	uint64_t hash[8];
1531	uint8_t wbuffer[128]; /* always correctly aligned for uint64_t */
1532	} sha512_ctx_t;
1533	void md5_begin(md5_ctx_t *ctx) FAST_FUNC;
1534	void md5_hash(md5_ctx_t ctx, const void data, size_t length) FAST_FUNC;
1535	void md5_end(md5_ctx_t ctx, void resbuf) FAST_FUNC;
1536	void sha1_begin(sha1_ctx_t *ctx) FAST_FUNC;
1537	#define sha1_hash md5_hash
1538	void sha1_end(sha1_ctx_t ctx, void resbuf) FAST_FUNC;
1539	void sha256_begin(sha256_ctx_t *ctx) FAST_FUNC;
1540	#define sha256_hash md5_hash
1541	#define sha256_end sha1_end
1542	void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;
1543	void sha512_hash(sha512_ctx_t ctx, const void buffer, size_t len) FAST_FUNC;
1544	void sha512_end(sha512_ctx_t ctx, void resbuf) FAST_FUNC;
1545
1546	extern uint32_t *global_crc32_table;
1547	uint32_t crc32_filltable(uint32_t tbl256, int endian) FAST_FUNC;
1548	uint32_t crc32_block_endian1(uint32_t val, const void buf, unsigned len, uint32_t crc_table) FAST_FUNC;
1549	uint32_t crc32_block_endian0(uint32_t val, const void buf, unsigned len, uint32_t crc_table) FAST_FUNC;
1550
1551	typedef struct masks_labels_t {
1552	const char *labels;
1553	const int masks[];
1554	} masks_labels_t;
1555	int print_flags_separated(const int masks, const char labels,
1556	int flags, const char *separator) FAST_FUNC;
1557	int print_flags(const masks_labels_t *ml, int flags) FAST_FUNC;
1558
1559	typedef struct bb_progress_t {
1560	off_t lastsize;
1561	unsigned lastupdate_sec;
1562	unsigned start_sec;
1563	smallint inited;
1564	} bb_progress_t;
1565
1566	void bb_progress_init(bb_progress_t *p) FAST_FUNC;
1567	void bb_progress_update(bb_progress_t p, const char curfile,
1568	off_t beg_range, off_t transferred,
1569	off_t totalsize) FAST_FUNC;
1570
1571	extern const char *applet_name;
1572
1573	/* Some older linkers don't perform string merging, we used to have common strings
1574	* as global arrays to do it by hand. But:
1575	* (1) newer linkers do it themselves,
1576	* (2) however, they DONT merge string constants with global arrays,
1577	* even if the value is the same (!). Thus global arrays actually
1578	* increased size a bit: for example, "/etc/passwd" string from libc
1579	* wasn't merged with bb_path_passwd_file[] array!
1580	* Therefore now we use #defines.
1581	*/
1582	/* "BusyBox vN.N.N (timestamp or extra_version)" */
1583	extern const char bb_banner[];
1584	extern const char bb_msg_memory_exhausted[];
1585	extern const char bb_msg_invalid_date[];
1586	#define bb_msg_read_error "read error"
1587	#define bb_msg_write_error "write error"
1588	extern const char bb_msg_unknown[];
1589	extern const char bb_msg_can_not_create_raw_socket[];
1590	extern const char bb_msg_perm_denied_are_you_root[];
1591	extern const char bb_msg_you_must_be_root[];
1592	extern const char bb_msg_requires_arg[];
1593	extern const char bb_msg_invalid_arg[];
1594	extern const char bb_msg_standard_input[];
1595	extern const char bb_msg_standard_output[];
1596
1597	/* NB: (bb_hexdigits_upcase[i] \| 0x20) -> lowercase hex digit */
1598	extern const char bb_hexdigits_upcase[];
1599
1600	extern const char bb_path_wtmp_file[];
1601
1602	/* Busybox mount uses either /proc/mounts or /etc/mtab to
1603	* get the list of currently mounted filesystems */
1604	#define bb_path_mtab_file IF_FEATURE_MTAB_SUPPORT("/etc/mtab")IF_NOT_FEATURE_MTAB_SUPPORT("/proc/mounts")
1605
1606	#define bb_path_passwd_file "/etc/passwd"
1607	#define bb_path_shadow_file "/etc/shadow"
1608	#define bb_path_gshadow_file "/etc/gshadow"
1609	#define bb_path_group_file "/etc/group"
1610
1611	#define bb_path_motd_file "/etc/motd"
1612
1613	#define bb_dev_null "/dev/null"
1614	extern const char bb_busybox_exec_path[];
1615	/* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
1616	* but I want to save a few bytes here */
1617	extern const char bb_PATH_root_path[]; /* "PATH=/sbin:/usr/sbin:/bin:/usr/bin" */
1618	#define bb_default_root_path (bb_PATH_root_path + sizeof("PATH"))
1619	#define bb_default_path (bb_PATH_root_path + sizeof("PATH=/sbin:/usr/sbin"))
1620
1621	extern const int const_int_0;
1622	extern const int const_int_1;
1623
1624
1625	/* Providing hard guarantee on minimum size (think of BUFSIZ == 128) */
1626	enum { COMMON_BUFSIZE = (BUFSIZ >= 256sizeof(void) ? BUFSIZ+1 : 256sizeof(void)) };
1627	extern char bb_common_bufsiz1[COMMON_BUFSIZE];
1628	/* This struct is deliberately not defined. */
1629	/* See docs/keep_data_small.txt */
1630	struct globals;
1631	/* '*const' ptr makes gcc optimize code much better.
1632	* Magic prevents ptr_to_globals from going into rodata.
1633	* If you want to assign a value, use SET_PTR_TO_GLOBALS(x) */
1634	extern struct globals *const ptr_to_globals;
1635	/* At least gcc 3.4.6 on mipsel system needs optimization barrier */
1636	#define barrier() __asm__ __volatile__("":::"memory")
1637	#define SET_PTR_TO_GLOBALS(x) do { \
1638	((struct globals)&ptr_to_globals) = (void)(x); \
1639	barrier(); \
1640	} while (0)
1641
1642	/* You can change LIBBB_DEFAULT_LOGIN_SHELL, but don't use it,
1643	* use bb_default_login_shell and following defines.
1644	* If you change LIBBB_DEFAULT_LOGIN_SHELL,
1645	* don't forget to change increment constant. */
1646	#define LIBBB_DEFAULT_LOGIN_SHELL "-/bin/sh"
1647	extern const char bb_default_login_shell[];
1648	/* "/bin/sh" */
1649	#define DEFAULT_SHELL (bb_default_login_shell+1)
1650	/* "sh" */
1651	#define DEFAULT_SHELL_SHORT_NAME (bb_default_login_shell+6)
1652
1653	/* The following devices are the same on all systems. */
1654	#define CURRENT_TTY "/dev/tty"
1655	#define DEV_CONSOLE "/dev/console"
1656
1657	#if defined(__FreeBSD_kernel__)
1658	# define CURRENT_VC CURRENT_TTY
1659	# define VC_1 "/dev/ttyv0"
1660	# define VC_2 "/dev/ttyv1"
1661	# define VC_3 "/dev/ttyv2"
1662	# define VC_4 "/dev/ttyv3"
1663	# define VC_5 "/dev/ttyv4"
1664	# define VC_FORMAT "/dev/ttyv%d"
1665	#elif defined(__GNU__)
1666	# define CURRENT_VC CURRENT_TTY
1667	# define VC_1 "/dev/tty1"
1668	# define VC_2 "/dev/tty2"
1669	# define VC_3 "/dev/tty3"
1670	# define VC_4 "/dev/tty4"
1671	# define VC_5 "/dev/tty5"
1672	# define VC_FORMAT "/dev/tty%d"
1673	#elif ENABLE_FEATURE_DEVFS
1674	/Linux, obsolete devfs names /
1675	# define CURRENT_VC "/dev/vc/0"
1676	# define VC_1 "/dev/vc/1"
1677	# define VC_2 "/dev/vc/2"
1678	# define VC_3 "/dev/vc/3"
1679	# define VC_4 "/dev/vc/4"
1680	# define VC_5 "/dev/vc/5"
1681	# define VC_FORMAT "/dev/vc/%d"
1682	# define LOOP_FORMAT "/dev/loop/%d"
1683	# define LOOP_NAMESIZE (sizeof("/dev/loop/") + sizeof(int)*3 + 1)
1684	# define LOOP_NAME "/dev/loop/"
1685	# define FB_0 "/dev/fb/0"
1686	#else
1687	/Linux, normal names /
1688	# define CURRENT_VC "/dev/tty0"
1689	# define VC_1 "/dev/tty1"
1690	# define VC_2 "/dev/tty2"
1691	# define VC_3 "/dev/tty3"
1692	# define VC_4 "/dev/tty4"
1693	# define VC_5 "/dev/tty5"
1694	# define VC_FORMAT "/dev/tty%d"
1695	# define LOOP_FORMAT "/dev/loop%d"
1696	# define LOOP_NAMESIZE (sizeof("/dev/loop") + sizeof(int)*3 + 1)
1697	# define LOOP_NAME "/dev/loop"
1698	# define FB_0 "/dev/fb0"
1699	#endif
1700
1701
1702	#define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))
1703
1704
1705	/* We redefine ctype macros. Unicode-correct handling of char types
1706	* can't be done with such byte-oriented operations anyway,
1707	* we don't lose anything.
1708	*/
1709	#undef isalnum
1710	#undef isalpha
1711	#undef isascii
1712	#undef isblank
1713	#undef iscntrl
1714	#undef isdigit
1715	#undef isgraph
1716	#undef islower
1717	#undef isprint
1718	#undef ispunct
1719	#undef isspace
1720	#undef isupper
1721	#undef isxdigit
1722	#undef toupper
1723	#undef tolower
1724
1725	/* We save ~500 bytes on isdigit alone.
1726	* BTW, x86 likes (unsigned char) cast more than (unsigned). */
1727
1728	/* These work the same for ASCII and Unicode,
1729	* assuming no one asks "is this a Unicode letter?" using isalpha(letter) */
1730	#define isascii(a) ((unsigned char)(a) <= 0x7f)
1731	#define isdigit(a) ((unsigned char)((a) - '0') <= 9)
1732	#define isupper(a) ((unsigned char)((a) - 'A') <= ('Z' - 'A'))
1733	#define islower(a) ((unsigned char)((a) - 'a') <= ('z' - 'a'))
1734	#define isalpha(a) ((unsigned char)(((a)\|0x20) - 'a') <= ('z' - 'a'))
1735	#define isblank(a) ({ unsigned char bb__isblank = (a); bb__isblank == ' ' \|\| bb__isblank == '\t'; })
1736	#define iscntrl(a) ({ unsigned char bb__iscntrl = (a); bb__iscntrl < ' ' \|\| bb__iscntrl == 0x7f; })
1737	/* In POSIX/C locale isspace is only these chars: "\t\n\v\f\r" and space.
1738	* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
1739	*/
1740	#define isspace(a) ({ unsigned char bb__isspace = (a) - 9; bb__isspace == (' ' - 9) \|\| bb__isspace <= (13 - 9); })
1741	// Unsafe wrt NUL: #define ispunct(a) (strchr("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{\|}~", (a)) != NULL)
1742	#define ispunct(a) (strchrnul("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{\|}~", (a))[0])
1743	// Bigger code: #define isalnum(a) ({ unsigned char bb__isalnum = (a) - '0'; bb__isalnum <= 9 \|\| ((bb__isalnum - ('A' - '0')) & 0xdf) <= 25; })
1744	#define isalnum(a) bb_ascii_isalnum(a)
1745	static ALWAYS_INLINE int bb_ascii_isalnum(unsigned char a)
1746	{
1747	unsigned char b = a - '0';
1748	if (b <= 9)
1749	return (b <= 9);
1750	b = (a\|0x20) - 'a';
1751	return b <= 'z' - 'a';
1752	}
1753	#define isxdigit(a) bb_ascii_isxdigit(a)
1754	static ALWAYS_INLINE int bb_ascii_isxdigit(unsigned char a)
1755	{
1756	unsigned char b = a - '0';
1757	if (b <= 9)
1758	return (b <= 9);
1759	b = (a\|0x20) - 'a';
1760	return b <= 'f' - 'a';
1761	}
1762	#define toupper(a) bb_ascii_toupper(a)
1763	static ALWAYS_INLINE unsigned char bb_ascii_toupper(unsigned char a)
1764	{
1765	unsigned char b = a - 'a';
1766	if (b <= ('z' - 'a'))
1767	a -= 'a' - 'A';
1768	return a;
1769	}
1770	#define tolower(a) bb_ascii_tolower(a)
1771	static ALWAYS_INLINE unsigned char bb_ascii_tolower(unsigned char a)
1772	{
1773	unsigned char b = a - 'A';
1774	if (b <= ('Z' - 'A'))
1775	a += 'a' - 'A';
1776	return a;
1777	}
1778
1779	/* In ASCII and Unicode, these are likely to be very different.
1780	* Let's prevent ambiguous usage from the start */
1781	#define isgraph(a) isgraph_is_ambiguous_dont_use(a)
1782	#define isprint(a) isprint_is_ambiguous_dont_use(a)
1783	/* NB: must not treat EOF as isgraph or isprint */
1784	#define isgraph_asciionly(a) ((unsigned)((a) - 0x21) <= 0x7e - 0x21)
1785	#define isprint_asciionly(a) ((unsigned)((a) - 0x20) <= 0x7e - 0x20)
1786
1787
1788	POP_SAVED_FUNCTION_VISIBILITY
1789
1790	#endif

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