blob: f569b0263bfe2ceb0aee4433db59a34bcdce24f2 [file] [log] [blame]
Denis Vlasenko858ebf12008-04-09 00:33:53 +00001/* 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 Denys Vlasenko
8 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02009 * Licensed under GPLv2, see file LICENSE in this source tree.
Denis Vlasenko858ebf12008-04-09 00:33:53 +000010 */
11
12/* We need to have separate xfuncs.c and xfuncs_printf.c because
13 * with current linkers, even with section garbage collection,
14 * if *.o module references any of XXXprintf functions, you pull in
15 * entire printf machinery. Even if you do not use the function
16 * which uses XXXprintf.
17 *
18 * xfuncs.c contains functions (not necessarily xfuncs)
19 * which do not pull in printf, directly or indirectly.
20 * xfunc_printf.c contains those which do.
21 */
22
23#include "libbb.h"
24
25
26/* All the functions starting with "x" call bb_error_msg_and_die() if they
27 * fail, so callers never need to check for errors. If it returned, it
28 * succeeded. */
29
30#ifndef DMALLOC
31/* dmalloc provides variants of these that do abort() on failure.
32 * Since dmalloc's prototypes overwrite the impls here as they are
33 * included after these prototypes in libbb.h, all is well.
34 */
35// Warn if we can't allocate size bytes of memory.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000036void* FAST_FUNC malloc_or_warn(size_t size)
Denis Vlasenko858ebf12008-04-09 00:33:53 +000037{
38 void *ptr = malloc(size);
39 if (ptr == NULL && size != 0)
40 bb_error_msg(bb_msg_memory_exhausted);
41 return ptr;
42}
43
44// Die if we can't allocate size bytes of memory.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000045void* FAST_FUNC xmalloc(size_t size)
Denis Vlasenko858ebf12008-04-09 00:33:53 +000046{
47 void *ptr = malloc(size);
48 if (ptr == NULL && size != 0)
49 bb_error_msg_and_die(bb_msg_memory_exhausted);
50 return ptr;
51}
52
53// Die if we can't resize previously allocated memory. (This returns a pointer
54// to the new memory, which may or may not be the same as the old memory.
55// It'll copy the contents to a new chunk and free the old one if necessary.)
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000056void* FAST_FUNC xrealloc(void *ptr, size_t size)
Denis Vlasenko858ebf12008-04-09 00:33:53 +000057{
58 ptr = realloc(ptr, size);
59 if (ptr == NULL && size != 0)
60 bb_error_msg_and_die(bb_msg_memory_exhausted);
61 return ptr;
62}
63#endif /* DMALLOC */
64
65// Die if we can't allocate and zero size bytes of memory.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000066void* FAST_FUNC xzalloc(size_t size)
Denis Vlasenko858ebf12008-04-09 00:33:53 +000067{
68 void *ptr = xmalloc(size);
69 memset(ptr, 0, size);
70 return ptr;
71}
72
73// Die if we can't copy a string to freshly allocated memory.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000074char* FAST_FUNC xstrdup(const char *s)
Denis Vlasenko858ebf12008-04-09 00:33:53 +000075{
76 char *t;
77
78 if (s == NULL)
79 return NULL;
80
81 t = strdup(s);
82
83 if (t == NULL)
84 bb_error_msg_and_die(bb_msg_memory_exhausted);
85
86 return t;
87}
88
89// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
90// the (possibly truncated to length n) string into it.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000091char* FAST_FUNC xstrndup(const char *s, int n)
Denis Vlasenko858ebf12008-04-09 00:33:53 +000092{
93 int m;
94 char *t;
95
96 if (ENABLE_DEBUG && s == NULL)
97 bb_error_msg_and_die("xstrndup bug");
98
99 /* We can just xmalloc(n+1) and strncpy into it, */
100 /* but think about xstrndup("abc", 10000) wastage! */
101 m = n;
102 t = (char*) s;
103 while (m) {
104 if (!*t) break;
105 m--;
106 t++;
107 }
108 n -= m;
109 t = xmalloc(n + 1);
110 t[n] = '\0';
111
112 return memcpy(t, s, n);
113}
114
Ron Yorstond840c5d2015-07-19 23:05:20 +0200115void* FAST_FUNC xmemdup(const void *s, int n)
116{
117 return memcpy(xmalloc(n), s, n);
118}
119
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000120// Die if we can't open a file and return a FILE* to it.
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000121// Notice we haven't got xfread(), This is for use with fscanf() and friends.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000122FILE* FAST_FUNC xfopen(const char *path, const char *mode)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000123{
124 FILE *fp = fopen(path, mode);
125 if (fp == NULL)
126 bb_perror_msg_and_die("can't open '%s'", path);
127 return fp;
128}
129
130// Die if we can't open a file and return a fd.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000131int FAST_FUNC xopen3(const char *pathname, int flags, int mode)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000132{
133 int ret;
134
135 ret = open(pathname, flags, mode);
136 if (ret < 0) {
137 bb_perror_msg_and_die("can't open '%s'", pathname);
138 }
139 return ret;
140}
141
Denys Vlasenkoc05387d2010-10-18 02:38:27 +0200142// Die if we can't open a file and return a fd.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000143int FAST_FUNC xopen(const char *pathname, int flags)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000144{
145 return xopen3(pathname, flags, 0666);
146}
147
148// Warn if we can't open a file and return a fd.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000149int FAST_FUNC open3_or_warn(const char *pathname, int flags, int mode)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000150{
151 int ret;
152
153 ret = open(pathname, flags, mode);
154 if (ret < 0) {
155 bb_perror_msg("can't open '%s'", pathname);
156 }
157 return ret;
158}
159
160// Warn if we can't open a file and return a fd.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000161int FAST_FUNC open_or_warn(const char *pathname, int flags)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000162{
163 return open3_or_warn(pathname, flags, 0666);
164}
165
Ryan Mallon5906a5c2013-10-08 14:52:49 +0200166/* Die if we can't open an existing file readonly with O_NONBLOCK
167 * and return the fd.
168 * Note that for ioctl O_RDONLY is sufficient.
169 */
170int FAST_FUNC xopen_nonblocking(const char *pathname)
171{
172 return xopen(pathname, O_RDONLY | O_NONBLOCK);
173}
174
175int FAST_FUNC xopen_as_uid_gid(const char *pathname, int flags, uid_t u, gid_t g)
176{
177 int fd;
178 uid_t old_euid = geteuid();
179 gid_t old_egid = getegid();
180
181 xsetegid(g);
182 xseteuid(u);
183
184 fd = xopen(pathname, flags);
185
186 xseteuid(old_euid);
187 xsetegid(old_egid);
188
189 return fd;
190}
191
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000192void FAST_FUNC xunlink(const char *pathname)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000193{
194 if (unlink(pathname))
195 bb_perror_msg_and_die("can't remove file '%s'", pathname);
196}
197
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000198void FAST_FUNC xrename(const char *oldpath, const char *newpath)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000199{
200 if (rename(oldpath, newpath))
201 bb_perror_msg_and_die("can't move '%s' to '%s'", oldpath, newpath);
202}
203
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000204int FAST_FUNC rename_or_warn(const char *oldpath, const char *newpath)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000205{
206 int n = rename(oldpath, newpath);
207 if (n)
208 bb_perror_msg("can't move '%s' to '%s'", oldpath, newpath);
209 return n;
210}
211
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000212void FAST_FUNC xpipe(int filedes[2])
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000213{
214 if (pipe(filedes))
215 bb_perror_msg_and_die("can't create pipe");
216}
217
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000218void FAST_FUNC xdup2(int from, int to)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000219{
220 if (dup2(from, to) != to)
221 bb_perror_msg_and_die("can't duplicate file descriptor");
222}
223
224// "Renumber" opened fd
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000225void FAST_FUNC xmove_fd(int from, int to)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000226{
227 if (from == to)
228 return;
229 xdup2(from, to);
230 close(from);
231}
232
233// Die with an error message if we can't write the entire buffer.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000234void FAST_FUNC xwrite(int fd, const void *buf, size_t count)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000235{
236 if (count) {
237 ssize_t size = full_write(fd, buf, count);
Denys Vlasenko9fd61be2016-09-05 15:20:10 +0200238 if ((size_t)size != count) {
239 /*
240 * Two cases: write error immediately;
241 * or some writes succeeded, then we hit an error.
242 * In either case, errno is set.
243 */
244 bb_perror_msg_and_die(
245 size >= 0 ? "short write" : "write error"
246 );
247 }
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000248 }
249}
Denis Vlasenko73c571a2009-03-09 00:12:37 +0000250void FAST_FUNC xwrite_str(int fd, const char *str)
251{
252 xwrite(fd, str, strlen(str));
253}
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000254
Denys Vlasenkodcd27ab2009-10-05 03:03:07 +0200255void FAST_FUNC xclose(int fd)
256{
257 if (close(fd))
258 bb_perror_msg_and_die("close failed");
259}
260
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000261// Die with an error message if we can't lseek to the right spot.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000262off_t FAST_FUNC xlseek(int fd, off_t offset, int whence)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000263{
264 off_t off = lseek(fd, offset, whence);
265 if (off == (off_t)-1) {
266 if (whence == SEEK_SET)
267 bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
268 bb_perror_msg_and_die("lseek");
269 }
270 return off;
271}
272
Alexander Shishkin67227372010-10-22 13:27:16 +0200273int FAST_FUNC xmkstemp(char *template)
274{
275 int fd = mkstemp(template);
276 if (fd < 0)
277 bb_perror_msg_and_die("can't create temp file '%s'", template);
278 return fd;
279}
280
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000281// Die with supplied filename if this FILE* has ferror set.
282void FAST_FUNC die_if_ferror(FILE *fp, const char *fn)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000283{
284 if (ferror(fp)) {
285 /* ferror doesn't set useful errno */
286 bb_error_msg_and_die("%s: I/O error", fn);
287 }
288}
289
290// Die with an error message if stdout has ferror set.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000291void FAST_FUNC die_if_ferror_stdout(void)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000292{
293 die_if_ferror(stdout, bb_msg_standard_output);
294}
295
Denys Vlasenko8131eea2009-11-02 14:19:51 +0100296int FAST_FUNC fflush_all(void)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000297{
Denys Vlasenko8131eea2009-11-02 14:19:51 +0100298 return fflush(NULL);
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000299}
300
301
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000302int FAST_FUNC bb_putchar(int ch)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000303{
Denys Vlasenkoc0664722010-01-02 18:49:22 +0100304 return putchar(ch);
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000305}
306
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000307/* Die with an error message if we can't copy an entire FILE* to stdout,
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000308 * then close that file. */
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000309void FAST_FUNC xprint_and_close_file(FILE *file)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000310{
Denys Vlasenko8131eea2009-11-02 14:19:51 +0100311 fflush_all();
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000312 // copyfd outputs error messages for us.
Denys Vlasenko8131eea2009-11-02 14:19:51 +0100313 if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000314 xfunc_die();
315
316 fclose(file);
317}
318
319// Die with an error message if we can't malloc() enough space and do an
320// sprintf() into that space.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000321char* FAST_FUNC xasprintf(const char *format, ...)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000322{
323 va_list p;
324 int r;
325 char *string_ptr;
326
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000327 va_start(p, format);
328 r = vasprintf(&string_ptr, format, p);
329 va_end(p);
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000330
331 if (r < 0)
332 bb_error_msg_and_die(bb_msg_memory_exhausted);
333 return string_ptr;
334}
335
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000336void FAST_FUNC xsetenv(const char *key, const char *value)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000337{
338 if (setenv(key, value, 1))
339 bb_error_msg_and_die(bb_msg_memory_exhausted);
340}
341
Denis Vlasenko76ddc2e2008-12-30 05:05:31 +0000342/* Handles "VAR=VAL" strings, even those which are part of environ
343 * _right now_
344 */
345void FAST_FUNC bb_unsetenv(const char *var)
346{
Denys Vlasenkoef0366e2017-07-22 02:15:17 +0200347 char onstack[128 - 16]; /* smaller stack setup code on x86 */
348 char *tp;
Denis Vlasenko76ddc2e2008-12-30 05:05:31 +0000349
Denys Vlasenkoef0366e2017-07-22 02:15:17 +0200350 tp = strchr(var, '=');
351 if (tp) {
352 /* In case var was putenv'ed, we can't replace '='
353 * with NUL and unsetenv(var) - it won't work,
354 * env is modified by the replacement, unsetenv
355 * sees "VAR" instead of "VAR=VAL" and does not remove it!
356 * Horror :(
357 */
358 unsigned sz = tp - var;
359 if (sz < sizeof(onstack)) {
360 ((char*)mempcpy(onstack, var, sz))[0] = '\0';
361 tp = NULL;
362 var = onstack;
363 } else {
364 /* unlikely: very long var name */
365 var = tp = xstrndup(var, sz);
366 }
Denis Vlasenko76ddc2e2008-12-30 05:05:31 +0000367 }
Denys Vlasenkoef0366e2017-07-22 02:15:17 +0200368 unsetenv(var);
Denis Vlasenko76ddc2e2008-12-30 05:05:31 +0000369 free(tp);
370}
371
Denys Vlasenkodd8adde2010-06-24 05:00:50 +0200372void FAST_FUNC bb_unsetenv_and_free(char *var)
373{
374 bb_unsetenv(var);
375 free(var);
376}
Denis Vlasenko76ddc2e2008-12-30 05:05:31 +0000377
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000378// Die with an error message if we can't set gid. (Because resource limits may
379// limit this user to a given number of processes, and if that fills up the
380// setgid() will fail and we'll _still_be_root_, which is bad.)
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000381void FAST_FUNC xsetgid(gid_t gid)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000382{
383 if (setgid(gid)) bb_perror_msg_and_die("setgid");
384}
385
386// Die with an error message if we can't set uid. (See xsetgid() for why.)
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000387void FAST_FUNC xsetuid(uid_t uid)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000388{
389 if (setuid(uid)) bb_perror_msg_and_die("setuid");
390}
391
Ryan Mallon5906a5c2013-10-08 14:52:49 +0200392void FAST_FUNC xsetegid(gid_t egid)
393{
394 if (setegid(egid)) bb_perror_msg_and_die("setegid");
395}
396
397void FAST_FUNC xseteuid(uid_t euid)
398{
399 if (seteuid(euid)) bb_perror_msg_and_die("seteuid");
400}
401
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000402// Die if we can't chdir to a new path.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000403void FAST_FUNC xchdir(const char *path)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000404{
405 if (chdir(path))
Pascal Bellard70fc8c12012-06-12 13:21:02 +0200406 bb_perror_msg_and_die("can't change directory to '%s'", path);
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000407}
408
Denys Vlasenkoc4199f22016-04-01 22:12:44 +0200409void FAST_FUNC xfchdir(int fd)
410{
411 if (fchdir(fd))
412 bb_perror_msg_and_die("fchdir");
413}
414
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000415void FAST_FUNC xchroot(const char *path)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000416{
417 if (chroot(path))
Pascal Bellard70fc8c12012-06-12 13:21:02 +0200418 bb_perror_msg_and_die("can't change root directory to '%s'", path);
Denys Vlasenko0687a5b2012-03-08 00:28:24 +0100419 xchdir("/");
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000420}
421
422// Print a warning message if opendir() fails, but don't die.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000423DIR* FAST_FUNC warn_opendir(const char *path)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000424{
425 DIR *dp;
426
427 dp = opendir(path);
428 if (!dp)
429 bb_perror_msg("can't open '%s'", path);
430 return dp;
431}
432
433// Die with an error message if opendir() fails.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000434DIR* FAST_FUNC xopendir(const char *path)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000435{
436 DIR *dp;
437
438 dp = opendir(path);
439 if (!dp)
440 bb_perror_msg_and_die("can't open '%s'", path);
441 return dp;
442}
443
444// Die with an error message if we can't open a new socket.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000445int FAST_FUNC xsocket(int domain, int type, int protocol)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000446{
447 int r = socket(domain, type, protocol);
448
449 if (r < 0) {
450 /* Hijack vaguely related config option */
451#if ENABLE_VERBOSE_RESOLUTION_ERRORS
452 const char *s = "INET";
Jeremie Koenig29885112010-05-27 15:39:24 +0200453# ifdef AF_PACKET
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000454 if (domain == AF_PACKET) s = "PACKET";
Jeremie Koenig29885112010-05-27 15:39:24 +0200455# endif
456# ifdef AF_NETLINK
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000457 if (domain == AF_NETLINK) s = "NETLINK";
Jeremie Koenig29885112010-05-27 15:39:24 +0200458# endif
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000459IF_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
Denys Vlasenkob2e5fc32009-11-25 14:52:47 +0100460 bb_perror_msg_and_die("socket(AF_%s,%d,%d)", s, type, protocol);
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000461#else
462 bb_perror_msg_and_die("socket");
463#endif
464 }
465
466 return r;
467}
468
469// Die with an error message if we can't bind a socket to an address.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000470void FAST_FUNC xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000471{
472 if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
473}
474
475// Die with an error message if we can't listen for connections on a socket.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000476void FAST_FUNC xlisten(int s, int backlog)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000477{
478 if (listen(s, backlog)) bb_perror_msg_and_die("listen");
479}
480
481/* Die with an error message if sendto failed.
482 * Return bytes sent otherwise */
Denis Vlasenkofa65a3d2009-01-24 20:11:36 +0000483ssize_t FAST_FUNC xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000484 socklen_t tolen)
485{
486 ssize_t ret = sendto(s, buf, len, 0, to, tolen);
487 if (ret < 0) {
488 if (ENABLE_FEATURE_CLEAN_UP)
489 close(s);
490 bb_perror_msg_and_die("sendto");
491 }
492 return ret;
493}
494
495// xstat() - a stat() which dies on failure with meaningful error message
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000496void FAST_FUNC xstat(const char *name, struct stat *stat_buf)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000497{
498 if (stat(name, stat_buf))
499 bb_perror_msg_and_die("can't stat '%s'", name);
500}
501
Denys Vlasenko8d3e2252010-08-31 12:42:06 +0200502void FAST_FUNC xfstat(int fd, struct stat *stat_buf, const char *errmsg)
503{
504 /* errmsg is usually a file name, but not always:
505 * xfstat may be called in a spot where file name is no longer
506 * available, and caller may give e.g. "can't stat input file" string.
507 */
508 if (fstat(fd, stat_buf))
509 bb_simple_perror_msg_and_die(errmsg);
510}
511
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000512// selinux_or_die() - die if SELinux is disabled.
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000513void FAST_FUNC selinux_or_die(void)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000514{
515#if ENABLE_SELINUX
516 int rc = is_selinux_enabled();
517 if (rc == 0) {
518 bb_error_msg_and_die("SELinux is disabled");
519 } else if (rc < 0) {
520 bb_error_msg_and_die("is_selinux_enabled() failed");
521 }
522#else
523 bb_error_msg_and_die("SELinux support is disabled");
524#endif
525}
526
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000527int FAST_FUNC ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000528{
529 int ret;
530 va_list p;
531
532 ret = ioctl(fd, request, argp);
533 if (ret < 0) {
534 va_start(p, fmt);
535 bb_verror_msg(fmt, p, strerror(errno));
536 /* xfunc_die can actually longjmp, so be nice */
537 va_end(p);
538 xfunc_die();
539 }
540 return ret;
541}
542
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000543int FAST_FUNC ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000544{
545 va_list p;
546 int ret = ioctl(fd, request, argp);
547
548 if (ret < 0) {
549 va_start(p, fmt);
550 bb_verror_msg(fmt, p, strerror(errno));
551 va_end(p);
552 }
553 return ret;
554}
555
556#if ENABLE_IOCTL_HEX2STR_ERROR
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000557int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000558{
559 int ret;
560
561 ret = ioctl(fd, request, argp);
562 if (ret < 0)
563 bb_simple_perror_msg(ioctl_name);
564 return ret;
565}
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000566int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000567{
568 int ret;
569
570 ret = ioctl(fd, request, argp);
571 if (ret < 0)
572 bb_simple_perror_msg_and_die(ioctl_name);
573 return ret;
574}
575#else
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000576int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000577{
578 int ret;
579
580 ret = ioctl(fd, request, argp);
581 if (ret < 0)
582 bb_perror_msg("ioctl %#x failed", request);
583 return ret;
584}
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000585int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp)
Denis Vlasenko858ebf12008-04-09 00:33:53 +0000586{
587 int ret;
588
589 ret = ioctl(fd, request, argp);
590 if (ret < 0)
591 bb_perror_msg_and_die("ioctl %#x failed", request);
592 return ret;
593}
594#endif
Denys Vlasenko19ced5c2010-06-06 21:53:09 +0200595
596char* FAST_FUNC xmalloc_ttyname(int fd)
597{
Denys Vlasenko543efd72013-08-06 00:41:06 +0200598 char buf[128];
599 int r = ttyname_r(fd, buf, sizeof(buf) - 1);
600 if (r)
601 return NULL;
602 return xstrdup(buf);
Denys Vlasenko19ced5c2010-06-06 21:53:09 +0200603}
604
605void FAST_FUNC generate_uuid(uint8_t *buf)
606{
607 /* http://www.ietf.org/rfc/rfc4122.txt
608 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
609 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
610 * | time_low |
611 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
612 * | time_mid | time_hi_and_version |
613 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
614 * |clk_seq_and_variant | node (0-1) |
615 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
616 * | node (2-5) |
617 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
618 * IOW, uuid has this layout:
619 * uint32_t time_low (big endian)
620 * uint16_t time_mid (big endian)
621 * uint16_t time_hi_and_version (big endian)
622 * version is a 4-bit field:
623 * 1 Time-based
624 * 2 DCE Security, with embedded POSIX UIDs
625 * 3 Name-based (MD5)
626 * 4 Randomly generated
627 * 5 Name-based (SHA-1)
628 * uint16_t clk_seq_and_variant (big endian)
629 * variant is a 3-bit field:
630 * 0xx Reserved, NCS backward compatibility
631 * 10x The variant specified in rfc4122
632 * 110 Reserved, Microsoft backward compatibility
633 * 111 Reserved for future definition
634 * uint8_t node[6]
635 *
636 * For version 4, these bits are set/cleared:
637 * time_hi_and_version & 0x0fff | 0x4000
638 * clk_seq_and_variant & 0x3fff | 0x8000
639 */
640 pid_t pid;
641 int i;
642
643 i = open("/dev/urandom", O_RDONLY);
644 if (i >= 0) {
645 read(i, buf, 16);
646 close(i);
647 }
648 /* Paranoia. /dev/urandom may be missing.
649 * rand() is guaranteed to generate at least [0, 2^15) range,
650 * but lowest bits in some libc are not so "random". */
651 srand(monotonic_us()); /* pulls in printf */
652 pid = getpid();
653 while (1) {
654 for (i = 0; i < 16; i++)
655 buf[i] ^= rand() >> 5;
656 if (pid == 0)
657 break;
658 srand(pid);
659 pid = 0;
660 }
661
662 /* version = 4 */
663 buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
664 /* variant = 10x */
665 buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
666}
Pascal Bellard926031b2010-07-04 15:32:38 +0200667
668#if BB_MMU
669pid_t FAST_FUNC xfork(void)
670{
671 pid_t pid;
672 pid = fork();
673 if (pid < 0) /* wtf? */
674 bb_perror_msg_and_die("vfork"+1);
675 return pid;
676}
677#endif
Denys Vlasenko82203992016-04-02 18:06:24 +0200678
679void FAST_FUNC xvfork_parent_waits_and_exits(void)
680{
681 pid_t pid;
682
683 fflush_all();
684 pid = xvfork();
685 if (pid > 0) {
686 /* Parent */
687 int exit_status = wait_for_exitstatus(pid);
688 if (WIFSIGNALED(exit_status))
689 kill_myself_with_sig(WTERMSIG(exit_status));
690 _exit(WEXITSTATUS(exit_status));
691 }
692 /* Child continues */
693}