lib/exec_shell.c

   1 /*
   2  * exec_shell() - launch a shell, else exit!
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2, or (at your option) any
   7  * later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <sys/types.h>
  23 #include <libgen.h>
  24
  25 #include "nls.h"
  26 #include "c.h"
  27 #include "xalloc.h"
  28
  29 #include "exec_shell.h"
  30
  31 #define DEFAULT_SHELL "/bin/sh"
  32
  33 void __attribute__((__noreturn__)) exec_shell(void)
  34 {
  35         const char *shell = getenv("SHELL");
  36         char *shellc;
  37         const char *shell_basename;
  38         char *arg0;
  39
  40         if (!shell)
  41                 shell = DEFAULT_SHELL;
  42
  43         shellc = xstrdup(shell);
  44         shell_basename = basename(shellc);
  45         arg0 = xmalloc(strlen(shell_basename) + 2);
  46         arg0[0] = '-';
  47         strcpy(arg0 + 1, shell_basename);
  48
  49         execl(shell, arg0, NULL);
  50         errexec(shell);
  51 }