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/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <libc-lock.h>
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#include <sysdep-cancel.h>
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#include <sigsetops.h>
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#define SHELL_PATH "/bin/sh" /* Path of the shell. */
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#define SHELL_NAME "sh" /* Name to give it. */
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#ifdef _LIBC_REENTRANT
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static struct sigaction intr, quit;
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static int sa_refcntr;
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__libc_lock_define_initialized (static, lock);
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# define DO_LOCK() __libc_lock_lock (lock)
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# define DO_UNLOCK() __libc_lock_unlock (lock)
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# define INIT_LOCK() ({ __libc_lock_init (lock); sa_refcntr = 0; })
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# define ADD_REF() sa_refcntr++
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# define SUB_REF() --sa_refcntr
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#else
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# define DO_LOCK()
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# define DO_UNLOCK()
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# define INIT_LOCK()
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# define ADD_REF() 0
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# define SUB_REF() 0
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#endif
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/* Execute LINE as a shell command, returning its status. */
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static int
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do_system (const char *line)
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{
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int status, save;
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pid_t pid;
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struct sigaction sa;
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#ifndef _LIBC_REENTRANT
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struct sigaction intr, quit;
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#endif
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sigset_t omask;
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = 0;
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__sigemptyset (&sa.sa_mask);
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DO_LOCK ();
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if (ADD_REF () == 0)
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{
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if (__sigaction (SIGINT, &sa, &intr) < 0)
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{
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(void) SUB_REF ();
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goto out;
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}
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if (__sigaction (SIGQUIT, &sa, &quit) < 0)
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{
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save = errno;
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(void) SUB_REF ();
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goto out_restore_sigint;
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}
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}
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DO_UNLOCK ();
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/* We reuse the bitmap in the 'sa' structure. */
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__sigaddset (&sa.sa_mask, SIGCHLD);
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save = errno;
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if (__sigprocmask (SIG_BLOCK, &sa.sa_mask, &omask) < 0)
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{
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#ifndef _LIBC
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if (errno == ENOSYS)
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__set_errno (save);
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else
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#endif
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{
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DO_LOCK ();
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if (SUB_REF () == 0)
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{
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save = errno;
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(void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL);
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out_restore_sigint:
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(void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL);
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__set_errno (save);
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}
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out:
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DO_UNLOCK ();
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return -1;
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}
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}
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#ifdef CLEANUP_HANDLER
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CLEANUP_HANDLER;
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#endif
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#ifdef FORK
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pid = FORK ();
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#else
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pid = __fork ();
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#endif
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if (pid == (pid_t) 0)
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{
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/* Child side. */
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const char *new_argv[4];
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new_argv[0] = SHELL_NAME;
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new_argv[1] = "-c";
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new_argv[2] = line;
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new_argv[3] = NULL;
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/* Restore the signals. */
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(void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL);
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(void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL);
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(void) __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL);
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INIT_LOCK ();
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/* Exec the shell. */
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(void) __execve (SHELL_PATH, (char *const *) new_argv, __environ);
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_exit (127);
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}
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else if (pid < (pid_t) 0)
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/* The fork failed. */
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status = -1;
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else
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/* Parent side. */
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{
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/* Note the system() is a cancellation point. But since we call
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waitpid() which itself is a cancellation point we do not
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have to do anything here. */
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if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) != pid)
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status = -1;
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}
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#ifdef CLEANUP_HANDLER
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CLEANUP_RESET;
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#endif
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save = errno;
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DO_LOCK ();
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if ((SUB_REF () == 0
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&& (__sigaction (SIGINT, &intr, (struct sigaction *) NULL)
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| __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL)) != 0)
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|| __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL) != 0)
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{
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#ifndef _LIBC
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/* glibc cannot be used on systems without waitpid. */
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if (errno == ENOSYS)
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__set_errno (save);
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else
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#endif
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status = -1;
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}
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DO_UNLOCK ();
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return status;
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}
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int
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__libc_system (const char *line)
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{
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if (line == NULL)
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/* Check that we have a command processor available. It might
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not be available after a chroot(), for example. */
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return do_system ("exit 0") == 0;
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return do_system (line);
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}
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weak_alias (__libc_system, system)
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