2001-03-17 04:17:14 +05:30
|
|
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/* vi: set sw=4 ts=4: */
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|
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/*
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* Utility routines.
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*
|
2004-03-15 13:59:22 +05:30
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
2006-08-03 21:11:12 +05:30
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* Copyright (C) 2006 Rob Landley
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|
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* Copyright (C) 2006 Denis Vlasenko
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2001-03-17 04:17:14 +05:30
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*
|
2006-09-21 03:36:01 +05:30
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* Licensed under GPL version 2, see file LICENSE in this tarball for details.
|
2001-03-17 04:17:14 +05:30
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|
*/
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2006-05-05 02:52:27 +05:30
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|
|
#include "busybox.h"
|
2001-03-17 04:17:14 +05:30
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|
|
2006-08-05 01:50:03 +05:30
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|
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/* All the functions starting with "x" call bb_error_msg_and_die() if they
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* fail, so callers never need to check for errors. If it returned, it
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* succeeded. */
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2001-03-17 04:17:14 +05:30
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|
|
#ifndef DMALLOC
|
2006-08-29 05:01:54 +05:30
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|
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/* dmalloc provides variants of these that do abort() on failure.
|
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|
|
* Since dmalloc's prototypes overwrite the impls here as they are
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|
|
* included after these prototypes in libbb.h, all is well.
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|
|
|
*/
|
2006-09-15 01:22:07 +05:30
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|
|
// Die if we can't allocate size bytes of memory.
|
2006-03-07 02:17:33 +05:30
|
|
|
void *xmalloc(size_t size)
|
2001-03-17 04:17:14 +05:30
|
|
|
{
|
|
|
|
void *ptr = malloc(size);
|
2002-02-26 20:58:22 +05:30
|
|
|
if (ptr == NULL && size != 0)
|
2003-03-19 14:43:01 +05:30
|
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
2001-03-17 04:17:14 +05:30
|
|
|
return ptr;
|
|
|
|
}
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|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't resize previously allocated memory. (This returns a pointer
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|
|
// to the new memory, which may or may not be the same as the old memory.
|
|
|
|
// It'll copy the contents to a new chunk and free the old one if necessary.)
|
2006-03-07 02:17:33 +05:30
|
|
|
void *xrealloc(void *ptr, size_t size)
|
2001-03-17 04:17:14 +05:30
|
|
|
{
|
2002-02-26 20:58:22 +05:30
|
|
|
ptr = realloc(ptr, size);
|
|
|
|
if (ptr == NULL && size != 0)
|
2003-03-19 14:43:01 +05:30
|
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
2001-03-17 04:17:14 +05:30
|
|
|
return ptr;
|
|
|
|
}
|
2006-08-29 05:01:54 +05:30
|
|
|
#endif /* DMALLOC */
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|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't allocate and zero size bytes of memory.
|
2006-05-20 02:06:49 +05:30
|
|
|
void *xzalloc(size_t size)
|
|
|
|
{
|
|
|
|
void *ptr = xmalloc(size);
|
|
|
|
memset(ptr, 0, size);
|
|
|
|
return ptr;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't copy a string to freshly allocated memory.
|
2006-08-05 01:50:03 +05:30
|
|
|
char * xstrdup(const char *s)
|
2006-03-15 03:15:38 +05:30
|
|
|
{
|
2001-03-17 04:17:14 +05:30
|
|
|
char *t;
|
|
|
|
|
|
|
|
if (s == NULL)
|
|
|
|
return NULL;
|
|
|
|
|
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|
|
t = strdup (s);
|
|
|
|
|
|
|
|
if (t == NULL)
|
2003-03-19 14:43:01 +05:30
|
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
2001-03-17 04:17:14 +05:30
|
|
|
|
|
|
|
return t;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
|
|
|
|
// the (possibly truncated to length n) string into it.
|
2006-08-05 01:50:03 +05:30
|
|
|
char * xstrndup(const char *s, int n)
|
2006-03-15 03:15:38 +05:30
|
|
|
{
|
2001-03-17 04:17:14 +05:30
|
|
|
char *t;
|
|
|
|
|
2006-06-30 22:06:56 +05:30
|
|
|
if (ENABLE_DEBUG && s == NULL)
|
2006-08-03 21:11:12 +05:30
|
|
|
bb_error_msg_and_die("xstrndup bug");
|
2001-03-17 04:17:14 +05:30
|
|
|
|
|
|
|
t = xmalloc(++n);
|
2004-03-15 13:59:22 +05:30
|
|
|
|
2001-03-17 04:17:14 +05:30
|
|
|
return safe_strncpy(t,s,n);
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't open a file and return a FILE * to it.
|
|
|
|
// Notice we haven't got xfread(), This is for use with fscanf() and friends.
|
2006-08-03 21:11:12 +05:30
|
|
|
FILE *xfopen(const char *path, const char *mode)
|
2001-03-17 04:17:14 +05:30
|
|
|
{
|
|
|
|
FILE *fp;
|
|
|
|
if ((fp = fopen(path, mode)) == NULL)
|
2003-03-19 14:43:01 +05:30
|
|
|
bb_perror_msg_and_die("%s", path);
|
2001-03-17 04:17:14 +05:30
|
|
|
return fp;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't open an existing file and return an fd.
|
2006-08-03 21:11:12 +05:30
|
|
|
int xopen(const char *pathname, int flags)
|
2006-04-13 18:15:04 +05:30
|
|
|
{
|
2006-09-05 15:06:19 +05:30
|
|
|
if (ENABLE_DEBUG && (flags & O_CREAT))
|
2006-09-07 00:32:46 +05:30
|
|
|
bb_error_msg_and_die("xopen() with O_CREAT");
|
2006-08-05 01:50:03 +05:30
|
|
|
|
2006-10-14 07:53:43 +05:30
|
|
|
return xopen3(pathname, flags, 0666);
|
2006-04-13 18:15:04 +05:30
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't open a new file and return an fd.
|
2006-08-03 21:11:12 +05:30
|
|
|
int xopen3(const char *pathname, int flags, int mode)
|
2002-09-25 08:17:48 +05:30
|
|
|
{
|
|
|
|
int ret;
|
2004-03-15 13:59:22 +05:30
|
|
|
|
2006-04-13 18:15:04 +05:30
|
|
|
ret = open(pathname, flags, mode);
|
|
|
|
if (ret < 0) {
|
2003-03-19 14:43:01 +05:30
|
|
|
bb_perror_msg_and_die("%s", pathname);
|
2002-09-25 08:17:48 +05:30
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't write the entire buffer.
|
2006-07-16 13:44:35 +05:30
|
|
|
void xwrite(int fd, void *buf, size_t count)
|
|
|
|
{
|
2006-10-13 04:14:13 +05:30
|
|
|
if (count) {
|
|
|
|
ssize_t size = full_write(fd, buf, count);
|
|
|
|
if (size != count)
|
2006-10-12 02:29:02 +05:30
|
|
|
bb_error_msg_and_die("short write");
|
2002-09-25 08:17:48 +05:30
|
|
|
}
|
2006-07-16 13:44:35 +05:30
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't lseek to the right spot.
|
2006-10-14 07:53:43 +05:30
|
|
|
off_t xlseek(int fd, off_t offset, int whence)
|
2006-07-16 13:44:35 +05:30
|
|
|
{
|
2006-10-14 07:53:43 +05:30
|
|
|
off_t off = lseek(fd, offset, whence);
|
|
|
|
if (off == (off_t)-1)
|
|
|
|
bb_perror_msg_and_die("lseek");
|
|
|
|
return off;
|
2002-09-25 08:17:48 +05:30
|
|
|
}
|
2003-03-19 14:43:01 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with supplied error message if this FILE * has ferror set.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xferror(FILE *fp, const char *fn)
|
2003-03-19 14:43:01 +05:30
|
|
|
{
|
|
|
|
if (ferror(fp)) {
|
|
|
|
bb_error_msg_and_die("%s", fn);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if stdout has ferror set.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xferror_stdout(void)
|
2003-03-19 14:43:01 +05:30
|
|
|
{
|
2006-08-03 21:11:12 +05:30
|
|
|
xferror(stdout, bb_msg_standard_output);
|
2003-03-19 14:43:01 +05:30
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we have trouble flushing stdout.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xfflush_stdout(void)
|
2003-03-19 14:43:01 +05:30
|
|
|
{
|
|
|
|
if (fflush(stdout)) {
|
|
|
|
bb_perror_msg_and_die(bb_msg_standard_output);
|
|
|
|
}
|
|
|
|
}
|
2006-05-26 04:32:40 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// This does a fork/exec in one call, using vfork(). Return PID of new child,
|
|
|
|
// -1 for failure. Runs argv[0], searching path if that has no / in it.
|
2006-08-03 21:11:12 +05:30
|
|
|
pid_t spawn(char **argv)
|
2006-05-26 04:32:40 +05:30
|
|
|
{
|
|
|
|
static int failed;
|
|
|
|
pid_t pid;
|
2006-08-10 02:26:23 +05:30
|
|
|
void *app = ENABLE_FEATURE_SH_STANDALONE_SHELL ? find_applet_by_name(argv[0]) : 0;
|
2006-05-26 04:32:40 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Be nice to nommu machines.
|
2006-05-26 04:32:40 +05:30
|
|
|
failed = 0;
|
|
|
|
pid = vfork();
|
|
|
|
if (pid < 0) return pid;
|
|
|
|
if (!pid) {
|
2006-06-14 06:54:33 +05:30
|
|
|
execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);
|
2006-05-26 04:32:40 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// We're sharing a stack with blocked parent, let parent know we failed
|
|
|
|
// and then exit to unblock parent (but don't run atexit() stuff, which
|
|
|
|
// would screw up parent.)
|
2006-05-26 04:32:40 +05:30
|
|
|
|
|
|
|
failed = -1;
|
|
|
|
_exit(0);
|
|
|
|
}
|
|
|
|
return failed ? failed : pid;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't spawn a child process.
|
2006-08-03 21:11:12 +05:30
|
|
|
pid_t xspawn(char **argv)
|
2006-05-26 04:32:40 +05:30
|
|
|
{
|
2006-08-03 21:11:12 +05:30
|
|
|
pid_t pid = spawn(argv);
|
2006-05-26 04:32:40 +05:30
|
|
|
if (pid < 0) bb_perror_msg_and_die("%s", *argv);
|
|
|
|
return pid;
|
|
|
|
}
|
2006-06-14 06:54:33 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Wait for the specified child PID to exit, returning child's error return.
|
2006-06-14 06:54:33 +05:30
|
|
|
int wait4pid(int pid)
|
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1;
|
|
|
|
if (WIFEXITED(status)) return WEXITSTATUS(status);
|
|
|
|
if (WIFSIGNALED(status)) return WTERMSIG(status);
|
|
|
|
return 0;
|
|
|
|
}
|
2006-07-10 13:11:34 +05:30
|
|
|
|
2006-10-03 21:27:40 +05:30
|
|
|
void xsetenv(const char *key, const char *value)
|
|
|
|
{
|
2006-10-12 02:29:02 +05:30
|
|
|
if (setenv(key, value, 1))
|
2006-10-03 21:27:40 +05:30
|
|
|
bb_error_msg_and_die(bb_msg_memory_exhausted);
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Convert unsigned integer to ascii, writing into supplied buffer. A
|
|
|
|
// truncated result is always null terminated (unless buflen is 0), and
|
|
|
|
// contains the first few digits of the result ala strncpy.
|
2006-07-11 06:14:36 +05:30
|
|
|
void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
|
2006-07-10 13:11:34 +05:30
|
|
|
{
|
|
|
|
int i, out = 0;
|
2006-07-11 06:14:36 +05:30
|
|
|
if (buflen) {
|
|
|
|
for (i=1000000000; i; i/=10) {
|
|
|
|
int res = n/i;
|
|
|
|
|
|
|
|
if ((res || out || i == 1) && --buflen>0) {
|
|
|
|
out++;
|
|
|
|
n -= res*i;
|
|
|
|
*buf++ = '0' + res;
|
|
|
|
}
|
2006-07-10 13:11:34 +05:30
|
|
|
}
|
2006-07-11 06:14:36 +05:30
|
|
|
*buf = 0;
|
2006-07-10 13:11:34 +05:30
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Convert signed integer to ascii, like utoa_to_buf()
|
2006-07-11 06:14:36 +05:30
|
|
|
void itoa_to_buf(int n, char *buf, unsigned buflen)
|
2006-07-10 13:11:34 +05:30
|
|
|
{
|
2006-07-11 06:14:36 +05:30
|
|
|
if (buflen && n<0) {
|
2006-07-10 13:11:34 +05:30
|
|
|
n = -n;
|
|
|
|
*buf++ = '-';
|
2006-07-11 06:14:36 +05:30
|
|
|
buflen--;
|
2006-07-10 13:11:34 +05:30
|
|
|
}
|
|
|
|
utoa_to_buf((unsigned)n, buf, buflen);
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// The following two functions use a static buffer, so calling either one a
|
|
|
|
// second time will overwrite previous results.
|
|
|
|
//
|
|
|
|
// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
|
|
|
|
// Int should always be 32 bits on any remotely Unix-like system, see
|
|
|
|
// http://www.unix.org/whitepapers/64bit.html for the reasons why.
|
|
|
|
|
2006-08-05 01:50:03 +05:30
|
|
|
static char local_buf[12];
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Convert unsigned integer to ascii using a static buffer (returned).
|
2006-08-05 01:50:03 +05:30
|
|
|
char *utoa(unsigned n)
|
|
|
|
{
|
|
|
|
utoa_to_buf(n, local_buf, sizeof(local_buf));
|
|
|
|
|
|
|
|
return local_buf;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Convert signed integer to ascii using a static buffer (returned).
|
2006-07-10 13:11:34 +05:30
|
|
|
char *itoa(int n)
|
|
|
|
{
|
|
|
|
itoa_to_buf(n, local_buf, sizeof(local_buf));
|
|
|
|
|
|
|
|
return local_buf;
|
|
|
|
}
|
2006-07-16 04:30:46 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't set gid. (Because resource limits may
|
|
|
|
// limit this user to a given number of processes, and if that fills up the
|
|
|
|
// setgid() will fail and we'll _still_be_root_, which is bad.)
|
2006-07-16 04:30:46 +05:30
|
|
|
void xsetgid(gid_t gid)
|
|
|
|
{
|
|
|
|
if (setgid(gid)) bb_error_msg_and_die("setgid");
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we cant' set uid. (See xsetgid() for why.)
|
2006-07-16 04:30:46 +05:30
|
|
|
void xsetuid(uid_t uid)
|
|
|
|
{
|
|
|
|
if (setuid(uid)) bb_error_msg_and_die("setuid");
|
|
|
|
}
|
2006-07-16 13:44:35 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Return how long the file at fd is, if there's any way to determine it.
|
2006-07-16 13:44:35 +05:30
|
|
|
off_t fdlength(int fd)
|
|
|
|
{
|
|
|
|
off_t bottom = 0, top = 0, pos;
|
|
|
|
long size;
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// If the ioctl works for this, return it.
|
2006-07-16 13:44:35 +05:30
|
|
|
|
|
|
|
if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// If not, do a binary search for the last location we can read. (Some
|
|
|
|
// block devices don't do BLKGETSIZE right.)
|
2006-07-16 13:44:35 +05:30
|
|
|
|
|
|
|
do {
|
|
|
|
char temp;
|
|
|
|
|
2006-09-05 15:06:19 +05:30
|
|
|
pos = bottom + (top - bottom) / 2;
|
2006-07-16 13:44:35 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// If we can read from the current location, it's bigger.
|
2006-07-16 13:44:35 +05:30
|
|
|
|
2006-10-14 07:53:43 +05:30
|
|
|
if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
|
2006-07-16 13:44:35 +05:30
|
|
|
if (bottom == top) bottom = top = (top+1) * 2;
|
|
|
|
else bottom = pos;
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// If we can't, it's smaller.
|
2006-07-16 13:44:35 +05:30
|
|
|
|
|
|
|
} else {
|
|
|
|
if (bottom == top) {
|
|
|
|
if (!top) return 0;
|
|
|
|
bottom = top/2;
|
|
|
|
}
|
|
|
|
else top = pos;
|
|
|
|
}
|
|
|
|
} while (bottom + 1 != top);
|
|
|
|
|
|
|
|
return pos + 1;
|
|
|
|
}
|
2006-08-03 21:11:12 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't malloc() enough space and do an
|
|
|
|
// sprintf() into that space.
|
2006-08-03 21:11:12 +05:30
|
|
|
char *xasprintf(const char *format, ...)
|
|
|
|
{
|
|
|
|
va_list p;
|
|
|
|
int r;
|
|
|
|
char *string_ptr;
|
|
|
|
|
|
|
|
#if 1
|
|
|
|
// GNU extension
|
|
|
|
va_start(p, format);
|
|
|
|
r = vasprintf(&string_ptr, format, p);
|
|
|
|
va_end(p);
|
|
|
|
#else
|
|
|
|
// Bloat for systems that haven't got the GNU extension.
|
|
|
|
va_start(p, format);
|
|
|
|
r = vsnprintf(NULL, 0, format, p);
|
|
|
|
va_end(p);
|
|
|
|
string_ptr = xmalloc(r+1);
|
|
|
|
va_start(p, format);
|
|
|
|
r = vsnprintf(string_ptr, r+1, format, p);
|
|
|
|
va_end(p);
|
|
|
|
#endif
|
|
|
|
|
2006-09-07 00:06:50 +05:30
|
|
|
if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted);
|
2006-08-03 21:11:12 +05:30
|
|
|
return string_ptr;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't copy an entire FILE * to stdout, then
|
|
|
|
// close that file.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xprint_and_close_file(FILE *file)
|
|
|
|
{
|
|
|
|
// copyfd outputs error messages for us.
|
2006-09-07 21:50:03 +05:30
|
|
|
if (bb_copyfd_eof(fileno(file), 1) == -1)
|
2006-10-04 01:58:06 +05:30
|
|
|
exit(xfunc_error_retval);
|
2006-08-03 21:11:12 +05:30
|
|
|
|
|
|
|
fclose(file);
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die if we can't chdir to a new path.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xchdir(const char *path)
|
|
|
|
{
|
|
|
|
if (chdir(path))
|
|
|
|
bb_perror_msg_and_die("chdir(%s)", path);
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Print a warning message if opendir() fails, but don't die.
|
2006-08-03 21:11:12 +05:30
|
|
|
DIR *warn_opendir(const char *path)
|
|
|
|
{
|
|
|
|
DIR *dp;
|
|
|
|
|
|
|
|
if ((dp = opendir(path)) == NULL) {
|
|
|
|
bb_perror_msg("unable to open `%s'", path);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return dp;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if opendir() fails.
|
2006-08-03 21:11:12 +05:30
|
|
|
DIR *xopendir(const char *path)
|
|
|
|
{
|
|
|
|
DIR *dp;
|
|
|
|
|
|
|
|
if ((dp = opendir(path)) == NULL)
|
|
|
|
bb_perror_msg_and_die("unable to open `%s'", path);
|
|
|
|
return dp;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifndef BB_NOMMU
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't daemonize.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xdaemon(int nochdir, int noclose)
|
|
|
|
{
|
2006-09-03 17:51:59 +05:30
|
|
|
if (daemon(nochdir, noclose)) bb_perror_msg_and_die("daemon");
|
2006-08-03 21:11:12 +05:30
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't open a new socket.
|
2006-08-03 21:11:12 +05:30
|
|
|
int xsocket(int domain, int type, int protocol)
|
|
|
|
{
|
|
|
|
int r = socket(domain, type, protocol);
|
|
|
|
|
|
|
|
if (r < 0) bb_perror_msg_and_die("socket");
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't bind a socket to an address.
|
2006-08-05 01:50:03 +05:30
|
|
|
void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
|
|
|
|
{
|
|
|
|
if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
|
|
|
|
}
|
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// Die with an error message if we can't listen for connections on a socket.
|
2006-08-03 21:11:12 +05:30
|
|
|
void xlisten(int s, int backlog)
|
|
|
|
{
|
|
|
|
if (listen(s, backlog)) bb_perror_msg_and_die("listen");
|
|
|
|
}
|
2006-09-11 14:48:09 +05:30
|
|
|
|
2006-09-15 01:22:07 +05:30
|
|
|
// xstat() - a stat() which dies on failure with meaningful error message
|
2006-09-13 03:12:17 +05:30
|
|
|
void xstat(char *name, struct stat *stat_buf)
|
2006-09-11 14:48:09 +05:30
|
|
|
{
|
2006-09-17 21:58:10 +05:30
|
|
|
if (stat(name, stat_buf))
|
2006-10-04 01:27:50 +05:30
|
|
|
bb_perror_msg_and_die("can't stat '%s'", name);
|
2006-09-11 14:48:09 +05:30
|
|
|
}
|
|
|
|
|
2006-09-21 03:36:01 +05:30
|
|
|
/* It is perfectly ok to pass in a NULL for either width or for
|
|
|
|
* * height, in which case that value will not be set. */
|
|
|
|
int get_terminal_width_height(int fd, int *width, int *height)
|
|
|
|
{
|
|
|
|
struct winsize win = { 0, 0, 0, 0 };
|
|
|
|
int ret = ioctl(fd, TIOCGWINSZ, &win);
|
|
|
|
if (!win.ws_row) {
|
|
|
|
char *s = getenv("LINES");
|
|
|
|
if (s) win.ws_row = atoi(s);
|
|
|
|
}
|
|
|
|
if (win.ws_row <= 1) win.ws_row = 24;
|
|
|
|
if (!win.ws_col) {
|
|
|
|
char *s = getenv("COLUMNS");
|
|
|
|
if (s) win.ws_col = atoi(s);
|
|
|
|
}
|
|
|
|
if (win.ws_col <= 1) win.ws_col = 80;
|
|
|
|
if (height) *height = (int) win.ws_row;
|
|
|
|
if (width) *width = (int) win.ws_col;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|