File: execlp.c

package info (click to toggle)
glibc 2.24-10
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 223,412 kB
  • sloc: ansic: 991,967; asm: 261,800; sh: 10,385; makefile: 9,710; cpp: 4,169; python: 3,971; perl: 2,254; awk: 1,753; pascal: 1,521; yacc: 291; sed: 80
file content (57 lines) | stat: -rw-r--r-- 1,786 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/param.h>

/* Execute FILE, searching in the `PATH' environment variable if
   it contains no slashes, with all arguments after FILE until a
   NULL pointer and environment from `environ'.  */
int
execlp (const char *file, const char *arg, ...)
{
  ptrdiff_t argc;
  va_list ap;
  va_start (ap, arg);
  for (argc = 1; va_arg (ap, const char *); argc++)
    {
      if (argc == INT_MAX)
	{
	  va_end (ap);
	  errno = E2BIG;
	  return -1;
	}
    }
  va_end (ap);

  /* Although posix does not state execlp as an async-safe function
     it can not use malloc to allocate the arguments since it might
     be used in a vfork scenario and it may lead to malloc internal
     bad state.  */
  ptrdiff_t i;
  char *argv[argc + 1];
  va_start (ap, arg);
  argv[0] = (char *) arg;
  for (i = 1; i <= argc; i++)
    argv[i] = va_arg (ap, char *);
  va_end (ap);

  return __execvpe (file, argv, __environ);
}
libc_hidden_def (execlp)