CLauncher, for iPodLinux.

clauncher.c

/* CLauncher: CLI Program Launcher for 5G's
 *
 * Copyright (C) 2006 Stephen Eisenhauer (BHSPitMonkey)
 *
 * 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
 
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/time.h>
/* #ifdef IPOD */
#include <linux/vt.h>
/* #endif */
#include <dirent.h>
#include <string.h>
#include <errno.h>

void pz_exec(char *filename);

int main()
{
  
  char selection;   /* Declare variable 'selection' */
  char pselection;

  menu1:
 {
/*   system("clear"); */
  printf("\n   iPod CLauncher\n\n");    /* These five lines display options */
  printf(" Press:\n");
  printf("MENU for podzilla2\n");
  printf("PREV for iDoom\n");
  printf("NEXT for iBoy\n");
  printf("PLAY for power options\n");


  while (selection = getchar())
    if (selection != 'l' && selection != 'r')
    {
      char c;  c = selection;  while ((int)c!=10) c = getchar();
      switch (selection)   /* Each response yield's a different outcome. */
      {
        case 'm':   /* If MENU is pressed... */
        printf("\nLaunching podzilla2!\n");
        pz_exec("/sbin/podzilla");
        system("sleep 1");
        goto menu1;
        break;

        case 'w':   /* If PREV is pressed... */
        printf("\nLaunching iDoom!\n");
        chdir("/mnt/iDoom"); pz_exec("./iDoom");
        goto menu1;
        break;

        case 'f':   /* If NEXT is pressed... */
        printf("\nLaunching iBoy!\n");
        chdir("/mnt/iBoy"); pz_exec("./iBoy");
        goto menu1;
        break;

/* Here's where I got lazy and decided the Power functions were unimportant... */

      
        case 'd':   /* If PLAY is pressed... */
/*      system("clear"); */
        printf("\n\n Press:\n");
        printf("PREV for reboot\n");
        printf("NEXT for power off\n");
        
        while (pselection = getchar())
          if (pselection != 'l' && pselection != 'r')
          {
            char d;  d = selection;  while ((int)d!=10) d = getchar();
            switch (pselection)
            {
              case 'w':   /* If PREV is pressed... */
              printf("Rebooting...\n");
              system("reboot");
              break;

              case 'f':   /* If NEXT is pressed... */
              printf("Shutting down...\n");
              system("poweroff");
              break;
            }
          }
        break;  

        default:
        printf("\nSorry, I didn't understand that option.\n");
        break;
      }
      
    }
  return 0;
 }
}

void pz_exec(char *filename)
{
    #define _
	
	static const char *const tty0[] = {"/dev/tty0", "/dev/vc/0", 0};
	static const char *const vcs[] = {"/dev/vc/%d", "/dev/tty%d", 0};
	int i, tty0_fd, ttyfd, curvt, fd, status, oldvt = 0;
	pid_t pid;

	/* query for a free VT */
	ttyfd = -1;
	tty0_fd = -1;
	for (i = 0; tty0[i] && (tty0_fd < 0); ++i) {
		tty0_fd = open(tty0[i], O_WRONLY, 0);
	}

	if (tty0_fd < 0) {
		tty0_fd = dup(0); /* STDIN is a VT? */
	}
	ioctl(tty0_fd, VT_OPENQRY, &curvt);
	close(tty0_fd);
	
	if ((geteuid() == 0) && (curvt > 0)) {
		for (i = 0; vcs[i] && (ttyfd < 0); ++i) {
			char vtpath[12];

			sprintf(vtpath, vcs[i], curvt);
			ttyfd = open(vtpath, O_RDWR);
		}
	}
	if (ttyfd < 0) {
		fprintf(stderr, "No available TTYs.\n");
		return;
	}

	if (ttyfd >= 0) {
		/* switch to the correct vt */
		if (curvt > 0) {
			struct vt_stat vtstate;

			if (ioctl(ttyfd, VT_GETSTATE, &vtstate) == 0) {
				oldvt = vtstate.v_active;
			}
			if (ioctl(ttyfd, VT_ACTIVATE, curvt)) {
				perror("child VT_ACTIVATE");
				return;
			}
			if (ioctl(ttyfd, VT_WAITACTIVE, curvt)) {
				perror("child VT_WAITACTIVE");
				return;
			}
		}
	}

	switch(pid = vfork()) {
	case -1: /* error */
		perror("vfork");
		break;
	case 0: /* child */
		close(ttyfd);
		if(setsid() < 0) {
			perror("setsid");
			_exit(1);
		}
		close(0);
		if((fd = open("/dev/console", O_RDWR)) == -1) {
			perror("/dev/console");
			_exit(1);
		}
		if(dup(fd) == -1) {
			perror("stdin dup");
			_exit(1);
		}
		close(1);
		if(dup(fd) == -1) {
			perror("stdout dup");
			_exit(1);
		}
		close(2);
		if(dup(fd) == -1) {
			perror("stderr dup");
			_exit(1);
		}

		execl(filename, filename, NULL);
		fprintf(stderr, _("Exec failed! (Check Permissions)\n"));
		_exit(1);
		break;
	default: /* parent */
		waitpid(pid, &status, 0);
		sleep(5);
		
		if (oldvt > 0) {
        		if (ioctl(ttyfd, VT_ACTIVATE, oldvt)) {
				perror("parent VT_ACTIVATE");
				return;
			}
        		if(ioctl(ttyfd, VT_WAITACTIVE, oldvt)) {
				perror("parent VT_WAITACTIVE");
				return;
			}
		}
		if (ttyfd > 0)
			close(ttyfd);

		if (curvt > 0) {
			int oldfd;

			if ((oldfd = open("/dev/vc/1", O_RDWR)) < 0)
				oldfd = open("/dev/tty1", O_RDWR);
			if (oldfd >= 0) {
				if (ioctl(oldfd, VT_DISALLOCATE, curvt)) {
					perror("VT_DISALLOCATE");
					return;
				}
				close(oldfd);
			}
		}
		break;
	}

}

CLauncher.md

CLauncher

A text-based launcher for Podzilla2, iDoom, and iBoy written for iPodLinux, and the first program I ever wrote (not counting previous TI-BASIC masterpieces). The last-modified timestamp reads Mon, Apr 10 2006 00:23:20. It required ample hand-holding from the very patient #iPodLinux IRC channel, it used hard-coded paths for everything, and I didn't really understand much of what was going on (I certainly didn't write any of the pz_exec function). But hey, Leo Laporte himself used it on TV, so I guess some people found it useful.