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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stackinfo.h>
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/* Execute PATH with all arguments after PATH until
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a NULL pointer and environment from `environ'. */
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int
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execl (const char *path, const char *arg, ...)
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{
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#define INITIAL_ARGV_MAX 1024
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size_t argv_max = INITIAL_ARGV_MAX;
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const char *initial_argv[INITIAL_ARGV_MAX];
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const char **argv = initial_argv;
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va_list args;
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argv[0] = arg;
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va_start (args, arg);
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unsigned int i = 0;
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while (argv[i++] != NULL)
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{
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if (i == argv_max)
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{
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argv_max *= 2;
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const char **nptr = realloc (argv == initial_argv ? NULL : argv,
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argv_max * sizeof (const char *));
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if (nptr == NULL)
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{
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if (argv != initial_argv)
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free (argv);
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va_end (args);
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return -1;
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}
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if (argv == initial_argv)
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/* We have to copy the already filled-in data ourselves. */
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memcpy (nptr, argv, i * sizeof (const char *));
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argv = nptr;
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}
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argv[i] = va_arg (args, const char *);
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}
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va_end (args);
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int ret = __execve (path, (char *const *) argv, __environ);
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if (argv != initial_argv)
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free (argv);
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return ret;
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}
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libc_hidden_def (execl)
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