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util-linux/lib/exec_shell.c

50 lines
1.4 KiB

/*
* exec_shell() - launch a shell, else exit!
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <libgen.h>
#include "nls.h"
#include "c.h"
#include "xalloc.h"
#include "exec_shell.h"
#define DEFAULT_SHELL "/bin/sh"
void __attribute__((__noreturn__)) exec_shell(void)
{
const char *shell = getenv("SHELL");
char *shellc = xstrdup(shell);
const char *shell_basename;
char *arg0;
if (!shell)
shell = DEFAULT_SHELL;
shell_basename = basename(shellc);
arg0 = xmalloc(strlen(shell_basename) + 2);
arg0[0] = '-';
strcpy(arg0 + 1, shell_basename);
execl(shell, arg0, NULL);
err(EXIT_FAILURE, _("failed to execute %s"), shell);
}