1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Utility routines.
|
---|
4 | *
|
---|
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
---|
6 | * Copyright (C) 2006 Rob Landley
|
---|
7 | * Copyright (C) 2006 Denis Vlasenko
|
---|
8 | *
|
---|
9 | * Licensed under GPL version 2, see file LICENSE in this tarball for details.
|
---|
10 | */
|
---|
11 |
|
---|
12 | #include "libbb.h"
|
---|
13 |
|
---|
14 | /* All the functions starting with "x" call bb_error_msg_and_die() if they
|
---|
15 | * fail, so callers never need to check for errors. If it returned, it
|
---|
16 | * succeeded. */
|
---|
17 |
|
---|
18 | #ifndef DMALLOC
|
---|
19 | /* dmalloc provides variants of these that do abort() on failure.
|
---|
20 | * Since dmalloc's prototypes overwrite the impls here as they are
|
---|
21 | * included after these prototypes in libbb.h, all is well.
|
---|
22 | */
|
---|
23 | // Warn if we can't allocate size bytes of memory.
|
---|
24 | void *malloc_or_warn(size_t size)
|
---|
25 | {
|
---|
26 | void *ptr = malloc(size);
|
---|
27 | if (ptr == NULL && size != 0)
|
---|
28 | bb_error_msg(bb_msg_memory_exhausted);
|
---|
29 | return ptr;
|
---|
30 | }
|
---|
31 |
|
---|
32 | // Die if we can't allocate size bytes of memory.
|
---|
33 | void *xmalloc(size_t size)
|
---|
34 | {
|
---|
35 | void *ptr = malloc(size);
|
---|
36 | if (ptr == NULL && size != 0)
|
---|
37 | bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
38 | return ptr;
|
---|
39 | }
|
---|
40 |
|
---|
41 | // Die if we can't resize previously allocated memory. (This returns a pointer
|
---|
42 | // to the new memory, which may or may not be the same as the old memory.
|
---|
43 | // It'll copy the contents to a new chunk and free the old one if necessary.)
|
---|
44 | void *xrealloc(void *ptr, size_t size)
|
---|
45 | {
|
---|
46 | ptr = realloc(ptr, size);
|
---|
47 | if (ptr == NULL && size != 0)
|
---|
48 | bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
49 | return ptr;
|
---|
50 | }
|
---|
51 | #endif /* DMALLOC */
|
---|
52 |
|
---|
53 | // Die if we can't allocate and zero size bytes of memory.
|
---|
54 | void *xzalloc(size_t size)
|
---|
55 | {
|
---|
56 | void *ptr = xmalloc(size);
|
---|
57 | memset(ptr, 0, size);
|
---|
58 | return ptr;
|
---|
59 | }
|
---|
60 |
|
---|
61 | // Die if we can't copy a string to freshly allocated memory.
|
---|
62 | char * xstrdup(const char *s)
|
---|
63 | {
|
---|
64 | char *t;
|
---|
65 |
|
---|
66 | if (s == NULL)
|
---|
67 | return NULL;
|
---|
68 |
|
---|
69 | t = strdup(s);
|
---|
70 |
|
---|
71 | if (t == NULL)
|
---|
72 | bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
73 |
|
---|
74 | return t;
|
---|
75 | }
|
---|
76 |
|
---|
77 | // Die if we can't allocate n+1 bytes (space for the null terminator) and copy
|
---|
78 | // the (possibly truncated to length n) string into it.
|
---|
79 | char * xstrndup(const char *s, int n)
|
---|
80 | {
|
---|
81 | int m;
|
---|
82 | char *t;
|
---|
83 |
|
---|
84 | if (ENABLE_DEBUG && s == NULL)
|
---|
85 | bb_error_msg_and_die("xstrndup bug");
|
---|
86 |
|
---|
87 | /* We can just xmalloc(n+1) and strncpy into it, */
|
---|
88 | /* but think about xstrndup("abc", 10000) wastage! */
|
---|
89 | m = n;
|
---|
90 | t = (char*) s;
|
---|
91 | while (m) {
|
---|
92 | if (!*t) break;
|
---|
93 | m--;
|
---|
94 | t++;
|
---|
95 | }
|
---|
96 | n -= m;
|
---|
97 | t = xmalloc(n + 1);
|
---|
98 | t[n] = '\0';
|
---|
99 |
|
---|
100 | return memcpy(t, s, n);
|
---|
101 | }
|
---|
102 |
|
---|
103 | // Die if we can't open a file and return a FILE * to it.
|
---|
104 | // Notice we haven't got xfread(), This is for use with fscanf() and friends.
|
---|
105 | FILE *xfopen(const char *path, const char *mode)
|
---|
106 | {
|
---|
107 | FILE *fp = fopen(path, mode);
|
---|
108 | if (fp == NULL)
|
---|
109 | bb_perror_msg_and_die("can't open '%s'", path);
|
---|
110 | return fp;
|
---|
111 | }
|
---|
112 |
|
---|
113 | // Die if we can't open a file and return a fd.
|
---|
114 | int xopen3(const char *pathname, int flags, int mode)
|
---|
115 | {
|
---|
116 | int ret;
|
---|
117 |
|
---|
118 | ret = open(pathname, flags, mode);
|
---|
119 | if (ret < 0) {
|
---|
120 | bb_perror_msg_and_die("can't open '%s'", pathname);
|
---|
121 | }
|
---|
122 | return ret;
|
---|
123 | }
|
---|
124 |
|
---|
125 | // Die if we can't open an existing file and return a fd.
|
---|
126 | int xopen(const char *pathname, int flags)
|
---|
127 | {
|
---|
128 | return xopen3(pathname, flags, 0666);
|
---|
129 | }
|
---|
130 |
|
---|
131 | // Warn if we can't open a file and return a fd.
|
---|
132 | int open3_or_warn(const char *pathname, int flags, int mode)
|
---|
133 | {
|
---|
134 | int ret;
|
---|
135 |
|
---|
136 | ret = open(pathname, flags, mode);
|
---|
137 | if (ret < 0) {
|
---|
138 | bb_perror_msg("can't open '%s'", pathname);
|
---|
139 | }
|
---|
140 | return ret;
|
---|
141 | }
|
---|
142 |
|
---|
143 | // Warn if we can't open a file and return a fd.
|
---|
144 | int open_or_warn(const char *pathname, int flags)
|
---|
145 | {
|
---|
146 | return open3_or_warn(pathname, flags, 0666);
|
---|
147 | }
|
---|
148 |
|
---|
149 | void xpipe(int filedes[2])
|
---|
150 | {
|
---|
151 | if (pipe(filedes))
|
---|
152 | bb_perror_msg_and_die("can't create pipe");
|
---|
153 | }
|
---|
154 |
|
---|
155 | void xunlink(const char *pathname)
|
---|
156 | {
|
---|
157 | if (unlink(pathname))
|
---|
158 | bb_perror_msg_and_die("can't remove file '%s'", pathname);
|
---|
159 | }
|
---|
160 |
|
---|
161 | // Turn on nonblocking I/O on a fd
|
---|
162 | int ndelay_on(int fd)
|
---|
163 | {
|
---|
164 | return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);
|
---|
165 | }
|
---|
166 |
|
---|
167 | int ndelay_off(int fd)
|
---|
168 | {
|
---|
169 | return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);
|
---|
170 | }
|
---|
171 |
|
---|
172 | void xdup2(int from, int to)
|
---|
173 | {
|
---|
174 | if (dup2(from, to) != to)
|
---|
175 | bb_perror_msg_and_die("can't duplicate file descriptor");
|
---|
176 | }
|
---|
177 |
|
---|
178 | // "Renumber" opened fd
|
---|
179 | void xmove_fd(int from, int to)
|
---|
180 | {
|
---|
181 | if (from == to)
|
---|
182 | return;
|
---|
183 | xdup2(from, to);
|
---|
184 | close(from);
|
---|
185 | }
|
---|
186 |
|
---|
187 | // Die with an error message if we can't write the entire buffer.
|
---|
188 | void xwrite(int fd, const void *buf, size_t count)
|
---|
189 | {
|
---|
190 | if (count) {
|
---|
191 | ssize_t size = full_write(fd, buf, count);
|
---|
192 | if (size != count)
|
---|
193 | bb_error_msg_and_die("short write");
|
---|
194 | }
|
---|
195 | }
|
---|
196 |
|
---|
197 | // Die with an error message if we can't lseek to the right spot.
|
---|
198 | off_t xlseek(int fd, off_t offset, int whence)
|
---|
199 | {
|
---|
200 | off_t off = lseek(fd, offset, whence);
|
---|
201 | if (off == (off_t)-1) {
|
---|
202 | if (whence == SEEK_SET)
|
---|
203 | bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
|
---|
204 | bb_perror_msg_and_die("lseek");
|
---|
205 | }
|
---|
206 | return off;
|
---|
207 | }
|
---|
208 |
|
---|
209 | // Die with supplied filename if this FILE * has ferror set.
|
---|
210 | void die_if_ferror(FILE *fp, const char *fn)
|
---|
211 | {
|
---|
212 | if (ferror(fp)) {
|
---|
213 | /* ferror doesn't set useful errno */
|
---|
214 | bb_error_msg_and_die("%s: I/O error", fn);
|
---|
215 | }
|
---|
216 | }
|
---|
217 |
|
---|
218 | // Die with an error message if stdout has ferror set.
|
---|
219 | void die_if_ferror_stdout(void)
|
---|
220 | {
|
---|
221 | die_if_ferror(stdout, bb_msg_standard_output);
|
---|
222 | }
|
---|
223 |
|
---|
224 | // Die with an error message if we have trouble flushing stdout.
|
---|
225 | void xfflush_stdout(void)
|
---|
226 | {
|
---|
227 | if (fflush(stdout)) {
|
---|
228 | bb_perror_msg_and_die(bb_msg_standard_output);
|
---|
229 | }
|
---|
230 | }
|
---|
231 |
|
---|
232 | void sig_block(int sig)
|
---|
233 | {
|
---|
234 | sigset_t ss;
|
---|
235 | sigemptyset(&ss);
|
---|
236 | sigaddset(&ss, sig);
|
---|
237 | sigprocmask(SIG_BLOCK, &ss, NULL);
|
---|
238 | }
|
---|
239 |
|
---|
240 | void sig_unblock(int sig)
|
---|
241 | {
|
---|
242 | sigset_t ss;
|
---|
243 | sigemptyset(&ss);
|
---|
244 | sigaddset(&ss, sig);
|
---|
245 | sigprocmask(SIG_UNBLOCK, &ss, NULL);
|
---|
246 | }
|
---|
247 |
|
---|
248 | #if 0
|
---|
249 | void sig_blocknone(void)
|
---|
250 | {
|
---|
251 | sigset_t ss;
|
---|
252 | sigemptyset(&ss);
|
---|
253 | sigprocmask(SIG_SETMASK, &ss, NULL);
|
---|
254 | }
|
---|
255 | #endif
|
---|
256 |
|
---|
257 | void sig_catch(int sig, void (*f)(int))
|
---|
258 | {
|
---|
259 | struct sigaction sa;
|
---|
260 | sa.sa_handler = f;
|
---|
261 | sa.sa_flags = 0;
|
---|
262 | sigemptyset(&sa.sa_mask);
|
---|
263 | sigaction(sig, &sa, NULL);
|
---|
264 | }
|
---|
265 |
|
---|
266 | void sig_pause(void)
|
---|
267 | {
|
---|
268 | sigset_t ss;
|
---|
269 | sigemptyset(&ss);
|
---|
270 | sigsuspend(&ss);
|
---|
271 | }
|
---|
272 |
|
---|
273 |
|
---|
274 | void xsetenv(const char *key, const char *value)
|
---|
275 | {
|
---|
276 | if (setenv(key, value, 1))
|
---|
277 | bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
278 | }
|
---|
279 |
|
---|
280 | // Converts unsigned long long value into compact 4-char
|
---|
281 | // representation. Examples: "1234", "1.2k", " 27M", "123T"
|
---|
282 | // Fifth char is always '\0'
|
---|
283 | void smart_ulltoa5(unsigned long long ul, char buf[5])
|
---|
284 | {
|
---|
285 | const char *fmt;
|
---|
286 | char c;
|
---|
287 | unsigned v,idx = 0;
|
---|
288 | ul *= 10;
|
---|
289 | if (ul > 9999*10) { // do not scale if 9999 or less
|
---|
290 | while (ul >= 10000) {
|
---|
291 | ul /= 1024;
|
---|
292 | idx++;
|
---|
293 | }
|
---|
294 | }
|
---|
295 | v = ul; // ullong divisions are expensive, avoid them
|
---|
296 |
|
---|
297 | fmt = " 123456789";
|
---|
298 | if (!idx) { // 9999 or less: use 1234 format
|
---|
299 | c = buf[0] = " 123456789"[v/10000];
|
---|
300 | if (c != ' ') fmt = "0123456789";
|
---|
301 | c = buf[1] = fmt[v/1000%10];
|
---|
302 | if (c != ' ') fmt = "0123456789";
|
---|
303 | buf[2] = fmt[v/100%10];
|
---|
304 | buf[3] = "0123456789"[v/10%10];
|
---|
305 | } else {
|
---|
306 | if (v >= 10*10) { // scaled value is >=10: use 123M format
|
---|
307 | c = buf[0] = " 123456789"[v/1000];
|
---|
308 | if (c != ' ') fmt = "0123456789";
|
---|
309 | buf[1] = fmt[v/100%10];
|
---|
310 | buf[2] = "0123456789"[v/10%10];
|
---|
311 | } else { // scaled value is <10: use 1.2M format
|
---|
312 | buf[0] = "0123456789"[v/10];
|
---|
313 | buf[1] = '.';
|
---|
314 | buf[2] = "0123456789"[v%10];
|
---|
315 | }
|
---|
316 | // see http://en.wikipedia.org/wiki/Tera
|
---|
317 | buf[3] = " kMGTPEZY"[idx];
|
---|
318 | }
|
---|
319 | buf[4] = '\0';
|
---|
320 | }
|
---|
321 |
|
---|
322 | // Convert unsigned integer to ascii, writing into supplied buffer.
|
---|
323 | // A truncated result contains the first few digits of the result ala strncpy.
|
---|
324 | // Returns a pointer past last generated digit, does _not_ store NUL.
|
---|
325 | void BUG_sizeof_unsigned_not_4(void);
|
---|
326 | char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
|
---|
327 | {
|
---|
328 | unsigned i, out, res;
|
---|
329 | if (sizeof(unsigned) != 4)
|
---|
330 | BUG_sizeof_unsigned_not_4();
|
---|
331 | if (buflen) {
|
---|
332 | out = 0;
|
---|
333 | for (i = 1000000000; i; i /= 10) {
|
---|
334 | res = n / i;
|
---|
335 | if (res || out || i == 1) {
|
---|
336 | if (!--buflen) break;
|
---|
337 | out++;
|
---|
338 | n -= res*i;
|
---|
339 | *buf++ = '0' + res;
|
---|
340 | }
|
---|
341 | }
|
---|
342 | }
|
---|
343 | return buf;
|
---|
344 | }
|
---|
345 |
|
---|
346 | // Convert signed integer to ascii, like utoa_to_buf()
|
---|
347 | char *itoa_to_buf(int n, char *buf, unsigned buflen)
|
---|
348 | {
|
---|
349 | if (buflen && n<0) {
|
---|
350 | n = -n;
|
---|
351 | *buf++ = '-';
|
---|
352 | buflen--;
|
---|
353 | }
|
---|
354 | return utoa_to_buf((unsigned)n, buf, buflen);
|
---|
355 | }
|
---|
356 |
|
---|
357 | // The following two functions use a static buffer, so calling either one a
|
---|
358 | // second time will overwrite previous results.
|
---|
359 | //
|
---|
360 | // The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
|
---|
361 | // Int should always be 32 bits on any remotely Unix-like system, see
|
---|
362 | // http://www.unix.org/whitepapers/64bit.html for the reasons why.
|
---|
363 |
|
---|
364 | static char local_buf[12];
|
---|
365 |
|
---|
366 | // Convert unsigned integer to ascii using a static buffer (returned).
|
---|
367 | char *utoa(unsigned n)
|
---|
368 | {
|
---|
369 | *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
|
---|
370 |
|
---|
371 | return local_buf;
|
---|
372 | }
|
---|
373 |
|
---|
374 | // Convert signed integer to ascii using a static buffer (returned).
|
---|
375 | char *itoa(int n)
|
---|
376 | {
|
---|
377 | *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
|
---|
378 |
|
---|
379 | return local_buf;
|
---|
380 | }
|
---|
381 |
|
---|
382 | // Emit a string of hex representation of bytes
|
---|
383 | char *bin2hex(char *p, const char *cp, int count)
|
---|
384 | {
|
---|
385 | while (count) {
|
---|
386 | unsigned char c = *cp++;
|
---|
387 | /* put lowercase hex digits */
|
---|
388 | *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
|
---|
389 | *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
|
---|
390 | count--;
|
---|
391 | }
|
---|
392 | return p;
|
---|
393 | }
|
---|
394 |
|
---|
395 | // Die with an error message if we can't set gid. (Because resource limits may
|
---|
396 | // limit this user to a given number of processes, and if that fills up the
|
---|
397 | // setgid() will fail and we'll _still_be_root_, which is bad.)
|
---|
398 | void xsetgid(gid_t gid)
|
---|
399 | {
|
---|
400 | if (setgid(gid)) bb_perror_msg_and_die("setgid");
|
---|
401 | }
|
---|
402 |
|
---|
403 | // Die with an error message if we can't set uid. (See xsetgid() for why.)
|
---|
404 | void xsetuid(uid_t uid)
|
---|
405 | {
|
---|
406 | if (setuid(uid)) bb_perror_msg_and_die("setuid");
|
---|
407 | }
|
---|
408 |
|
---|
409 | // Return how long the file at fd is, if there's any way to determine it.
|
---|
410 | off_t fdlength(int fd)
|
---|
411 | {
|
---|
412 | off_t bottom = 0, top = 0, pos;
|
---|
413 | long size;
|
---|
414 |
|
---|
415 | // If the ioctl works for this, return it.
|
---|
416 |
|
---|
417 | if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
|
---|
418 |
|
---|
419 | // FIXME: explain why lseek(SEEK_END) is not used here!
|
---|
420 |
|
---|
421 | // If not, do a binary search for the last location we can read. (Some
|
---|
422 | // block devices don't do BLKGETSIZE right.)
|
---|
423 |
|
---|
424 | do {
|
---|
425 | char temp;
|
---|
426 |
|
---|
427 | pos = bottom + (top - bottom) / 2;
|
---|
428 |
|
---|
429 | // If we can read from the current location, it's bigger.
|
---|
430 |
|
---|
431 | if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
|
---|
432 | if (bottom == top) bottom = top = (top+1) * 2;
|
---|
433 | else bottom = pos;
|
---|
434 |
|
---|
435 | // If we can't, it's smaller.
|
---|
436 |
|
---|
437 | } else {
|
---|
438 | if (bottom == top) {
|
---|
439 | if (!top) return 0;
|
---|
440 | bottom = top/2;
|
---|
441 | }
|
---|
442 | else top = pos;
|
---|
443 | }
|
---|
444 | } while (bottom + 1 != top);
|
---|
445 |
|
---|
446 | return pos + 1;
|
---|
447 | }
|
---|
448 |
|
---|
449 | // Die with an error message if we can't malloc() enough space and do an
|
---|
450 | // sprintf() into that space.
|
---|
451 | char *xasprintf(const char *format, ...)
|
---|
452 | {
|
---|
453 | va_list p;
|
---|
454 | int r;
|
---|
455 | char *string_ptr;
|
---|
456 |
|
---|
457 | #if 1
|
---|
458 | // GNU extension
|
---|
459 | va_start(p, format);
|
---|
460 | r = vasprintf(&string_ptr, format, p);
|
---|
461 | va_end(p);
|
---|
462 | #else
|
---|
463 | // Bloat for systems that haven't got the GNU extension.
|
---|
464 | va_start(p, format);
|
---|
465 | r = vsnprintf(NULL, 0, format, p);
|
---|
466 | va_end(p);
|
---|
467 | string_ptr = xmalloc(r+1);
|
---|
468 | va_start(p, format);
|
---|
469 | r = vsnprintf(string_ptr, r+1, format, p);
|
---|
470 | va_end(p);
|
---|
471 | #endif
|
---|
472 |
|
---|
473 | if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
474 | return string_ptr;
|
---|
475 | }
|
---|
476 |
|
---|
477 | #if 0 /* If we will ever meet a libc which hasn't [f]dprintf... */
|
---|
478 | int fdprintf(int fd, const char *format, ...)
|
---|
479 | {
|
---|
480 | va_list p;
|
---|
481 | int r;
|
---|
482 | char *string_ptr;
|
---|
483 |
|
---|
484 | #if 1
|
---|
485 | // GNU extension
|
---|
486 | va_start(p, format);
|
---|
487 | r = vasprintf(&string_ptr, format, p);
|
---|
488 | va_end(p);
|
---|
489 | #else
|
---|
490 | // Bloat for systems that haven't got the GNU extension.
|
---|
491 | va_start(p, format);
|
---|
492 | r = vsnprintf(NULL, 0, format, p) + 1;
|
---|
493 | va_end(p);
|
---|
494 | string_ptr = malloc(r);
|
---|
495 | if (string_ptr) {
|
---|
496 | va_start(p, format);
|
---|
497 | r = vsnprintf(string_ptr, r, format, p);
|
---|
498 | va_end(p);
|
---|
499 | }
|
---|
500 | #endif
|
---|
501 |
|
---|
502 | if (r >= 0) {
|
---|
503 | full_write(fd, string_ptr, r);
|
---|
504 | free(string_ptr);
|
---|
505 | }
|
---|
506 | return r;
|
---|
507 | }
|
---|
508 | #endif
|
---|
509 |
|
---|
510 | // Die with an error message if we can't copy an entire FILE * to stdout, then
|
---|
511 | // close that file.
|
---|
512 | void xprint_and_close_file(FILE *file)
|
---|
513 | {
|
---|
514 | fflush(stdout);
|
---|
515 | // copyfd outputs error messages for us.
|
---|
516 | if (bb_copyfd_eof(fileno(file), 1) == -1)
|
---|
517 | xfunc_die();
|
---|
518 |
|
---|
519 | fclose(file);
|
---|
520 | }
|
---|
521 |
|
---|
522 | // Die if we can't chdir to a new path.
|
---|
523 | void xchdir(const char *path)
|
---|
524 | {
|
---|
525 | if (chdir(path))
|
---|
526 | bb_perror_msg_and_die("chdir(%s)", path);
|
---|
527 | }
|
---|
528 |
|
---|
529 | // Print a warning message if opendir() fails, but don't die.
|
---|
530 | DIR *warn_opendir(const char *path)
|
---|
531 | {
|
---|
532 | DIR *dp;
|
---|
533 |
|
---|
534 | dp = opendir(path);
|
---|
535 | if (!dp)
|
---|
536 | bb_perror_msg("can't open '%s'", path);
|
---|
537 | return dp;
|
---|
538 | }
|
---|
539 |
|
---|
540 | // Die with an error message if opendir() fails.
|
---|
541 | DIR *xopendir(const char *path)
|
---|
542 | {
|
---|
543 | DIR *dp;
|
---|
544 |
|
---|
545 | dp = opendir(path);
|
---|
546 | if (!dp)
|
---|
547 | bb_perror_msg_and_die("can't open '%s'", path);
|
---|
548 | return dp;
|
---|
549 | }
|
---|
550 |
|
---|
551 | // Die with an error message if we can't open a new socket.
|
---|
552 | int xsocket(int domain, int type, int protocol)
|
---|
553 | {
|
---|
554 | int r = socket(domain, type, protocol);
|
---|
555 |
|
---|
556 | if (r < 0) {
|
---|
557 | /* Hijack vaguely related config option */
|
---|
558 | #if ENABLE_VERBOSE_RESOLUTION_ERRORS
|
---|
559 | const char *s = "INET";
|
---|
560 | if (domain == AF_PACKET) s = "PACKET";
|
---|
561 | if (domain == AF_NETLINK) s = "NETLINK";
|
---|
562 | USE_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
|
---|
563 | bb_perror_msg_and_die("socket(AF_%s)", s);
|
---|
564 | #else
|
---|
565 | bb_perror_msg_and_die("socket");
|
---|
566 | #endif
|
---|
567 | }
|
---|
568 |
|
---|
569 | return r;
|
---|
570 | }
|
---|
571 |
|
---|
572 | // Die with an error message if we can't bind a socket to an address.
|
---|
573 | void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
|
---|
574 | {
|
---|
575 | if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
|
---|
576 | }
|
---|
577 |
|
---|
578 | // Die with an error message if we can't listen for connections on a socket.
|
---|
579 | void xlisten(int s, int backlog)
|
---|
580 | {
|
---|
581 | if (listen(s, backlog)) bb_perror_msg_and_die("listen");
|
---|
582 | }
|
---|
583 |
|
---|
584 | /* Die with an error message if sendto failed.
|
---|
585 | * Return bytes sent otherwise */
|
---|
586 | ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
|
---|
587 | socklen_t tolen)
|
---|
588 | {
|
---|
589 | ssize_t ret = sendto(s, buf, len, 0, to, tolen);
|
---|
590 | if (ret < 0) {
|
---|
591 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
592 | close(s);
|
---|
593 | bb_perror_msg_and_die("sendto");
|
---|
594 | }
|
---|
595 | return ret;
|
---|
596 | }
|
---|
597 |
|
---|
598 | // xstat() - a stat() which dies on failure with meaningful error message
|
---|
599 | void xstat(const char *name, struct stat *stat_buf)
|
---|
600 | {
|
---|
601 | if (stat(name, stat_buf))
|
---|
602 | bb_perror_msg_and_die("can't stat '%s'", name);
|
---|
603 | }
|
---|
604 |
|
---|
605 | // selinux_or_die() - die if SELinux is disabled.
|
---|
606 | void selinux_or_die(void)
|
---|
607 | {
|
---|
608 | #if ENABLE_SELINUX
|
---|
609 | int rc = is_selinux_enabled();
|
---|
610 | if (rc == 0) {
|
---|
611 | bb_error_msg_and_die("SELinux is disabled");
|
---|
612 | } else if (rc < 0) {
|
---|
613 | bb_error_msg_and_die("is_selinux_enabled() failed");
|
---|
614 | }
|
---|
615 | #else
|
---|
616 | bb_error_msg_and_die("SELinux support is disabled");
|
---|
617 | #endif
|
---|
618 | }
|
---|
619 |
|
---|
620 | /* It is perfectly ok to pass in a NULL for either width or for
|
---|
621 | * height, in which case that value will not be set. */
|
---|
622 | int get_terminal_width_height(int fd, int *width, int *height)
|
---|
623 | {
|
---|
624 | struct winsize win = { 0, 0, 0, 0 };
|
---|
625 | int ret = ioctl(fd, TIOCGWINSZ, &win);
|
---|
626 |
|
---|
627 | if (height) {
|
---|
628 | if (!win.ws_row) {
|
---|
629 | char *s = getenv("LINES");
|
---|
630 | if (s) win.ws_row = atoi(s);
|
---|
631 | }
|
---|
632 | if (win.ws_row <= 1 || win.ws_row >= 30000)
|
---|
633 | win.ws_row = 24;
|
---|
634 | *height = (int) win.ws_row;
|
---|
635 | }
|
---|
636 |
|
---|
637 | if (width) {
|
---|
638 | if (!win.ws_col) {
|
---|
639 | char *s = getenv("COLUMNS");
|
---|
640 | if (s) win.ws_col = atoi(s);
|
---|
641 | }
|
---|
642 | if (win.ws_col <= 1 || win.ws_col >= 30000)
|
---|
643 | win.ws_col = 80;
|
---|
644 | *width = (int) win.ws_col;
|
---|
645 | }
|
---|
646 |
|
---|
647 | return ret;
|
---|
648 | }
|
---|
649 |
|
---|
650 | void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...)
|
---|
651 | {
|
---|
652 | va_list p;
|
---|
653 |
|
---|
654 | if (ioctl(fd, request, argp) < 0) {
|
---|
655 | va_start(p, fmt);
|
---|
656 | bb_verror_msg(fmt, p, strerror(errno));
|
---|
657 | /* xfunc_die can actually longjmp, so be nice */
|
---|
658 | va_end(p);
|
---|
659 | xfunc_die();
|
---|
660 | }
|
---|
661 | }
|
---|
662 |
|
---|
663 | int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
|
---|
664 | {
|
---|
665 | va_list p;
|
---|
666 | int ret = ioctl(fd, request, argp);
|
---|
667 |
|
---|
668 | if (ret < 0) {
|
---|
669 | va_start(p, fmt);
|
---|
670 | bb_verror_msg(fmt, p, strerror(errno));
|
---|
671 | va_end(p);
|
---|
672 | }
|
---|
673 | return ret;
|
---|
674 | }
|
---|
675 |
|
---|
676 | #if ENABLE_IOCTL_HEX2STR_ERROR
|
---|
677 | int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name)
|
---|
678 | {
|
---|
679 | int ret;
|
---|
680 |
|
---|
681 | ret = ioctl(fd, request, argp);
|
---|
682 | if (ret < 0)
|
---|
683 | bb_perror_msg("%s", ioctl_name);
|
---|
684 | return ret;
|
---|
685 | }
|
---|
686 | void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name)
|
---|
687 | {
|
---|
688 | if (ioctl(fd, request, argp) < 0)
|
---|
689 | bb_perror_msg_and_die("%s", ioctl_name);
|
---|
690 | }
|
---|
691 | #else
|
---|
692 | int bb_ioctl_or_warn(int fd, int request, void *argp)
|
---|
693 | {
|
---|
694 | int ret;
|
---|
695 |
|
---|
696 | ret = ioctl(fd, request, argp);
|
---|
697 | if (ret < 0)
|
---|
698 | bb_perror_msg("ioctl %#x failed", request);
|
---|
699 | return ret;
|
---|
700 | }
|
---|
701 | void bb_xioctl(int fd, int request, void *argp)
|
---|
702 | {
|
---|
703 | if (ioctl(fd, request, argp) < 0)
|
---|
704 | bb_perror_msg_and_die("ioctl %#x failed", request);
|
---|
705 | }
|
---|
706 | #endif
|
---|