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Collin Funk
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* execle() function: Execute a program, replacing the current process.
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Copyright (C) 2020-2026 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
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/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
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may optimize away the arg0 == NULL test below. */
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#define _GL_ARG_NONNULL(params)
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#include <config.h>
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/* Specification. */
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#include <unistd.h>
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#include <errno.h>
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#include <stdarg.h>
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#include "malloca.h"
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int
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execle (const char *program, const char *arg0, ...)
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{
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/* The callee is not expecting a NULL argv[0]. */
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if (arg0 == NULL)
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{
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errno = EINVAL;
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return -1;
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}
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/* Count the number of arguments (including arg0 and the trailing NULL). */
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size_t count = 1;
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{
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va_list args;
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va_start (args, arg0);
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for (;;)
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{
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count++;
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if (va_arg (args, const char *) == NULL)
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break;
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}
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va_end (args);
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}
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/* Allocate the argument vector. */
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const char **argv = (const char **) malloca (count * sizeof (const char *));
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if (argv == NULL)
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{
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errno = ENOMEM;
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return -1;
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}
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/* Copy the arguments into the argument vector. */
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va_list args;
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{
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size_t i = 0;
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argv[i++] = arg0;
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va_start (args, arg0);
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for (; i < count;)
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argv[i++] = va_arg (args, const char *);
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}
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char * const *env = va_arg (args, char * const *);
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va_end (args);
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/* Invoke execve. */
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execve (program, (char * const *) argv, env);
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/* If execve returned, it must have failed. */
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int saved_errno = errno;
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freea (argv);
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errno = saved_errno;
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return -1;
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}
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