mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-05-13 15:13:36 +00:00
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* execl() function: Execute a program, replacing the current process.
|
|
Copyright (C) 2020-2024 Free Software Foundation, Inc.
|
|
|
|
This file 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.
|
|
|
|
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
|
|
|
|
/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
|
|
may optimize away the arg0 == NULL test below. */
|
|
#define _GL_ARG_NONNULL(params)
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <unistd.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdarg.h>
|
|
|
|
#include "malloca.h"
|
|
|
|
int
|
|
execl (const char *program, const char *arg0, ...)
|
|
{
|
|
va_list args;
|
|
|
|
/* The callee is not expecting a NULL argv[0]. */
|
|
if (arg0 == NULL)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/* Count the number of arguments (including arg0 and the trailing NULL). */
|
|
size_t count = 1;
|
|
va_start (args, arg0);
|
|
for (;;)
|
|
{
|
|
count++;
|
|
if (va_arg (args, const char *) == NULL)
|
|
break;
|
|
}
|
|
va_end (args);
|
|
|
|
/* Allocate the argument vector. */
|
|
const char **argv = (const char **) malloca (count * sizeof (const char *));
|
|
if (argv == NULL)
|
|
{
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
/* Copy the arguments into the argument vector. */
|
|
{
|
|
size_t i = 0;
|
|
argv[i++] = arg0;
|
|
va_start (args, arg0);
|
|
for (; i < count;)
|
|
argv[i++] = va_arg (args, const char *);
|
|
va_end (args);
|
|
}
|
|
|
|
/* Invoke execv. */
|
|
execv (program, argv);
|
|
|
|
/* If execv returned, it must have failed. */
|
|
int saved_errno = errno;
|
|
freea (argv);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|