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/* Run a clisp process with stdin and stdout open.
Copyright (C) 2008 Free Software Foundation, Inc.
Written by FlĂvio Cruz <flaviocruz@gmail.com>
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <paths.h>
#include <errno.h>
#include <stdio.h>
#include <error.h>
/* lisp interpreter absolute location */
static char *LISP_PATH = "/usr/bin/clisp";
static int
fd_is_open (const int fd)
{
static struct stat buf;
return (fstat (fd, &buf) == 0);
}
static void
run_lisp (int argc, char **argv)
{
int stdin_handle, stdout_handle;
char *new_argv[argc + 1];
int i;
if (!fd_is_open (STDIN_FILENO))
{
stdin_handle = open (_PATH_DEVNULL, O_RDONLY);
if (stdin_handle == -1)
{
error (EXIT_FAILURE, errno, "Could not open file %s",
_PATH_DEVNULL);
}
}
if (!fd_is_open (STDOUT_FILENO))
{
stdout_handle = open (_PATH_DEVNULL, O_WRONLY);
if (stdout_handle == -1)
{
error (EXIT_FAILURE, errno, "Could not open file %s",
_PATH_DEVNULL);
}
}
new_argv[0] = LISP_PATH;
for (i = 1; i <= argc; ++i)
{
new_argv[i] = argv[i];
}
execvp (new_argv[0], new_argv);
/* we should not get here ... */
error (EXIT_FAILURE, errno, "Could not launch lisp %s", LISP_PATH);
}
int
main (int argc, char **argv)
{
run_lisp (argc, argv);
return EXIT_SUCCESS;
}
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