busybox/console-tools/openvt.c

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/* vi: set sw=4 ts=4: */
/*
* openvt.c - open a vt to run a command.
*
* busyboxed by Quy Tonthat <quy@signal3.com>
* hacked by Tito <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
/* getopt not needed */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
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#include <ctype.h>
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#include "busybox.h"
int openvt_main(int argc, char **argv)
{
int fd;
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char vtname[sizeof(VC_FORMAT) + 2];
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if (argc < 3) {
bb_show_usage();
}
/* check for Illegal vt number: < 1 or > 12 */
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sprintf(vtname, VC_FORMAT, (int)bb_xgetlarg(argv[1], 10, 1, 12));
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if (fork() == 0) {
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/* leave current vt */
if (setsid() < 0) {
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bb_perror_msg_and_die("setsid");
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}
close(0); /* so that new vt becomes stdin */
/* and grab new one */
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fd = bb_xopen(vtname, O_RDWR);
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/* Reassign stdout and sterr */
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dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
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execvp(argv[2], &argv[2]);
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_exit(1);
}
return EXIT_SUCCESS;
}