Ignore:
Timestamp:
Nov 4, 2007, 3:16:40 AM (12 years ago)
Author:
Bruno Cornec
Message:

Update to busybox 1.7.2

File:
1 edited

Legend:

Unmodified
Added
Removed
  • branches/2.2.5/mindi-busybox/libbb/xfuncs.c

    r821 r1765  
    44 *
    55 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
     6 * Copyright (C) 2006 Rob Landley
     7 * Copyright (C) 2006 Denis Vlasenko
    68 *
    7  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
     9 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
    810 */
    911
    10 #include <sys/types.h>
    11 #include <sys/stat.h>
    12 #include <sys/wait.h>
    13 #include <stdio.h>
    14 #include <string.h>
    15 #include <stdlib.h>
    16 #include <unistd.h>
    17 #include <fcntl.h>
    18 #include "busybox.h"
     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. */
    1917
    2018#ifndef DMALLOC
    21 #ifdef L_xmalloc
     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.
     24void *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.
    2233void *xmalloc(size_t size)
    2334{
     
    2738    return ptr;
    2839}
    29 #endif
    30 
    31 #ifdef L_xrealloc
     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.)
    3244void *xrealloc(void *ptr, size_t size)
    3345{
     
    3749    return ptr;
    3850}
    39 #endif
    40 
    41 #ifdef L_xzalloc
     51#endif /* DMALLOC */
     52
     53// Die if we can't allocate and zero size bytes of memory.
    4254void *xzalloc(size_t size)
    4355{
     
    4658    return ptr;
    4759}
    48 #endif
    49 
    50 #ifdef L_xcalloc
    51 void *xcalloc(size_t nmemb, size_t size)
    52 {
    53     void *ptr = calloc(nmemb, size);
    54     if (ptr == NULL && nmemb != 0 && size != 0)
    55         bb_error_msg_and_die(bb_msg_memory_exhausted);
    56     return ptr;
    57 }
    58 #endif
    59 #endif /* DMALLOC */
    60 
    61 #ifdef L_xstrdup
    62 char * bb_xstrdup (const char *s)
     60
     61// Die if we can't copy a string to freshly allocated memory.
     62char * xstrdup(const char *s)
    6363{
    6464    char *t;
     
    6767        return NULL;
    6868
    69     t = strdup (s);
     69    t = strdup(s);
    7070
    7171    if (t == NULL)
     
    7474    return t;
    7575}
    76 #endif
    77 
    78 #ifdef L_xstrndup
    79 char * bb_xstrndup (const char *s, int n)
    80 {
     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.
     79char * xstrndup(const char *s, int n)
     80{
     81    int m;
    8182    char *t;
    8283
    8384    if (ENABLE_DEBUG && s == NULL)
    84         bb_error_msg_and_die("bb_xstrndup bug");
    85 
    86     t = xmalloc(++n);
    87 
    88     return safe_strncpy(t,s,n);
    89 }
    90 #endif
    91 
    92 #ifdef L_xfopen
    93 FILE *bb_xfopen(const char *path, const char *mode)
    94 {
    95     FILE *fp;
    96     if ((fp = fopen(path, mode)) == NULL)
    97         bb_perror_msg_and_die("%s", path);
     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.
     105FILE *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);
    98110    return fp;
    99111}
    100 #endif
    101 
    102 #ifdef L_xopen
    103 int bb_xopen(const char *pathname, int flags)
    104 {
    105     return bb_xopen3(pathname, flags, 0777);
    106 }
    107 #endif
    108 
    109 #ifdef L_xopen3
    110 int bb_xopen3(const char *pathname, int flags, int mode)
     112
     113// Die if we can't open a file and return a fd.
     114int xopen3(const char *pathname, int flags, int mode)
    111115{
    112116    int ret;
     
    114118    ret = open(pathname, flags, mode);
    115119    if (ret < 0) {
    116         bb_perror_msg_and_die("%s", pathname);
     120        bb_perror_msg_and_die("can't open '%s'", pathname);
    117121    }
    118122    return ret;
    119123}
    120 #endif
    121 
    122 #ifdef L_xread
    123 ssize_t bb_xread(int fd, void *buf, size_t count)
    124 {
    125     ssize_t size;
    126 
    127     size = read(fd, buf, count);
    128     if (size < 0) {
    129         bb_perror_msg_and_die(bb_msg_read_error);
    130     }
    131     return(size);
    132 }
    133 #endif
    134 
    135 #ifdef L_xread_all
    136 void bb_xread_all(int fd, void *buf, size_t count)
    137 {
    138     ssize_t size;
    139 
    140     while (count) {
    141         if ((size = bb_xread(fd, buf, count)) == 0) {   /* EOF */
    142             bb_error_msg_and_die("Short read");
    143         }
    144         count -= size;
    145         buf = ((char *) buf) + size;
    146     }
    147     return;
    148 }
    149 #endif
    150 
    151 #ifdef L_xread_char
    152 unsigned char bb_xread_char(int fd)
    153 {
    154     char tmp;
    155 
    156     bb_xread_all(fd, &tmp, 1);
    157 
    158     return(tmp);
    159 }
    160 #endif
    161 
    162 #ifdef L_xferror
    163 void bb_xferror(FILE *fp, const char *fn)
     124
     125// Die if we can't open an existing file and return a fd.
     126int 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.
     132int 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.
     144int open_or_warn(const char *pathname, int flags)
     145{
     146    return open3_or_warn(pathname, flags, 0666);
     147}
     148
     149void xpipe(int filedes[2])
     150{
     151    if (pipe(filedes))
     152        bb_perror_msg_and_die("can't create pipe");
     153}
     154
     155void 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
     162int ndelay_on(int fd)
     163{
     164    return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);
     165}
     166
     167int ndelay_off(int fd)
     168{
     169    return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);
     170}
     171
     172void 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
     179void 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.
     188void 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.
     198off_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.
     210void die_if_ferror(FILE *fp, const char *fn)
    164211{
    165212    if (ferror(fp)) {
    166         bb_error_msg_and_die("%s", fn);
    167     }
    168 }
    169 #endif
    170 
    171 #ifdef L_xferror_stdout
    172 void bb_xferror_stdout(void)
    173 {
    174     bb_xferror(stdout, bb_msg_standard_output);
    175 }
    176 #endif
    177 
    178 #ifdef L_xfflush_stdout
    179 void bb_xfflush_stdout(void)
     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.
     219void 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.
     225void xfflush_stdout(void)
    180226{
    181227    if (fflush(stdout)) {
     
    183229    }
    184230}
     231
     232void sig_block(int sig)
     233{
     234    sigset_t ss;
     235    sigemptyset(&ss);
     236    sigaddset(&ss, sig);
     237    sigprocmask(SIG_BLOCK, &ss, NULL);
     238}
     239
     240void 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
     249void sig_blocknone(void)
     250{
     251    sigset_t ss;
     252    sigemptyset(&ss);
     253    sigprocmask(SIG_SETMASK, &ss, NULL);
     254}
    185255#endif
    186256
    187 #ifdef L_spawn
    188 // This does a fork/exec in one call, using vfork().
    189 pid_t bb_spawn(char **argv)
    190 {
    191     static int failed;
    192     pid_t pid;
    193     void *app = find_applet_by_name(argv[0]);
    194 
    195     // Be nice to nommu machines.
    196     failed = 0;
    197     pid = vfork();
    198     if (pid < 0) return pid;
    199     if (!pid) {
    200         execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);
    201 
    202         // We're sharing a stack with blocked parent, let parent know we failed
    203         // and then exit to unblock parent (but don't run atexit() stuff, which
    204         // would screw up parent.)
    205 
    206         failed = -1;
    207         _exit(0);
    208     }
    209     return failed ? failed : pid;
    210 }
     257void 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
     266void sig_pause(void)
     267{
     268    sigset_t ss;
     269    sigemptyset(&ss);
     270    sigsuspend(&ss);
     271}
     272
     273
     274void 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'
     283void 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.
     325void BUG_sizeof_unsigned_not_4(void);
     326char *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()
     347char *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
     364static char local_buf[12];
     365
     366// Convert unsigned integer to ascii using a static buffer (returned).
     367char *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).
     375char *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
     383char *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.)
     398void 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.)
     404void 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.
     410off_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.
     451char *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);
    211471#endif
    212472
    213 #ifdef L_xspawn
    214 pid_t bb_xspawn(char **argv)
    215 {
    216     pid_t pid = bb_spawn(argv);
    217     if (pid < 0) bb_perror_msg_and_die("%s", *argv);
    218     return pid;
    219 }
     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... */
     478int 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    }
    220500#endif
    221501
    222 #ifdef L_wait4
    223 int wait4pid(int pid)
    224 {
    225     int status;
    226 
    227     if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1;
    228     if (WIFEXITED(status)) return WEXITSTATUS(status);
    229     if (WIFSIGNALED(status)) return WTERMSIG(status);
    230     return 0;
    231 }
    232 #endif 
    233 
    234 #ifdef L_setuid
    235 void xsetgid(gid_t gid)
    236 {
    237     if (setgid(gid)) bb_error_msg_and_die("setgid");
    238 }
    239 
    240 void xsetuid(uid_t uid)
    241 {
    242     if (setuid(uid)) bb_error_msg_and_die("setuid");
     502    if (r >= 0) {
     503        full_write(fd, string_ptr, r);
     504        free(string_ptr);
     505    }
     506    return r;
    243507}
    244508#endif
     509
     510// Die with an error message if we can't copy an entire FILE * to stdout, then
     511// close that file.
     512void 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.
     523void 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.
     530DIR *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.
     541DIR *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.
     552int 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";
     562USE_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.
     573void 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.
     579void 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  */
     586ssize_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
     599void 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.
     606void 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.  */
     622int 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
     650void 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
     663int 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
     677int 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}
     686void 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
     692int 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}
     701void 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
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