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/* execl() function: Execute a program, replacing the current process.
Copyright (C) 2020-2023 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;
}
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