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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2006,2007,2008,2009,2010,2011 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config-util.h>
#include <config.h>
#include <grub/misc.h>
#include <unistd.h>
#include <grub/emu/exec.h>
#include <grub/emu/hostdisk.h>
#include <grub/emu/getroot.h>
#include <grub/util/misc.h>
#include <grub/disk.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
int
grub_util_exec_redirect_all (const char *const *argv, const char *stdin_file,
const char *stdout_file, const char *stderr_file)
{
pid_t pid;
int status = -1;
char *str, *pstr;
const char *const *ptr;
grub_size_t strl = 0;
for (ptr = argv; *ptr; ptr++)
strl += grub_strlen (*ptr) + 1;
if (stdin_file)
strl += grub_strlen (stdin_file) + 2;
if (stdout_file)
strl += grub_strlen (stdout_file) + 2;
if (stderr_file)
strl += grub_strlen (stderr_file) + 3;
pstr = str = xmalloc (strl);
for (ptr = argv; *ptr; ptr++)
{
pstr = grub_stpcpy (pstr, *ptr);
*pstr++ = ' ';
}
if (stdin_file)
{
*pstr++ = '<';
pstr = grub_stpcpy (pstr, stdin_file);
*pstr++ = ' ';
}
if (stdout_file)
{
*pstr++ = '>';
pstr = grub_stpcpy (pstr, stdout_file);
*pstr++ = ' ';
}
if (stderr_file)
{
*pstr++ = '2';
*pstr++ = '>';
pstr = grub_stpcpy (pstr, stderr_file);
pstr++;
}
*--pstr = '\0';
grub_util_info ("executing %s", str);
grub_free (str);
pid = fork ();
if (pid < 0)
grub_util_error (_("Unable to fork: %s"), strerror (errno));
else if (pid == 0)
{
int fd;
/* Child. */
/* Close fd's. */
#ifdef GRUB_UTIL
grub_util_devmapper_cleanup ();
grub_diskfilter_fini ();
#endif
if (stdin_file)
{
fd = open (stdin_file, O_RDONLY);
if (fd < 0)
_exit (127);
dup2 (fd, STDIN_FILENO);
close (fd);
}
if (stdout_file)
{
fd = open (stdout_file, O_WRONLY | O_CREAT, 0700);
if (fd < 0)
_exit (127);
dup2 (fd, STDOUT_FILENO);
close (fd);
}
if (stderr_file)
{
fd = open (stderr_file, O_WRONLY | O_CREAT, 0700);
if (fd < 0)
_exit (127);
dup2 (fd, STDERR_FILENO);
close (fd);
}
/* Ensure child is not localised. */
setenv ("LC_ALL", "C", 1);
execvp ((char *) argv[0], (char **) argv);
_exit (127);
}
waitpid (pid, &status, 0);
if (!WIFEXITED (status))
return -1;
return WEXITSTATUS (status);
}
int
grub_util_exec (const char *const *argv)
{
return grub_util_exec_redirect_all (argv, NULL, NULL, NULL);
}
int
grub_util_exec_redirect (const char *const *argv, const char *stdin_file,
const char *stdout_file)
{
return grub_util_exec_redirect_all (argv, stdin_file, stdout_file, NULL);
}
int
grub_util_exec_redirect_null (const char *const *argv)
{
return grub_util_exec_redirect_all (argv, "/dev/null", "/dev/null", NULL);
}
pid_t
grub_util_exec_pipe (const char *const *argv, int *fd)
{
int pipe_fd[2];
pid_t pid;
*fd = 0;
if (pipe (pipe_fd) < 0)
{
grub_util_warn (_("Unable to create pipe: %s"),
strerror (errno));
return 0;
}
pid = fork ();
if (pid < 0)
grub_util_error (_("Unable to fork: %s"), strerror (errno));
else if (pid == 0)
{
/* Child. */
/* Close fd's. */
#ifdef GRUB_UTIL
grub_util_devmapper_cleanup ();
grub_diskfilter_fini ();
#endif
/* Ensure child is not localised. */
setenv ("LC_ALL", "C", 1);
close (pipe_fd[0]);
dup2 (pipe_fd[1], STDOUT_FILENO);
close (pipe_fd[1]);
execvp ((char *) argv[0], (char **) argv);
_exit (127);
}
else
{
close (pipe_fd[1]);
*fd = pipe_fd[0];
return pid;
}
}
pid_t
grub_util_exec_pipe_stderr (const char *const *argv, int *fd)
{
int pipe_fd[2];
pid_t pid;
*fd = 0;
if (pipe (pipe_fd) < 0)
{
grub_util_warn (_("Unable to create pipe: %s"),
strerror (errno));
return 0;
}
pid = fork ();
if (pid < 0)
grub_util_error (_("Unable to fork: %s"), strerror (errno));
else if (pid == 0)
{
/* Child. */
/* Close fd's. */
#ifdef GRUB_UTIL
grub_util_devmapper_cleanup ();
grub_diskfilter_fini ();
#endif
/* Ensure child is not localised. */
setenv ("LC_ALL", "C", 1);
close (pipe_fd[0]);
dup2 (pipe_fd[1], STDOUT_FILENO);
dup2 (pipe_fd[1], STDERR_FILENO);
close (pipe_fd[1]);
execvp ((char *) argv[0], (char **) argv);
_exit (127);
}
else
{
close (pipe_fd[1]);
*fd = pipe_fd[0];
return pid;
}
}
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