xembed.c

   1 /*
   2  * See LICENSE file for copyright and license details.
   3  */
   4
   5 #include <fcntl.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 int
  11 main(int argc, char *argv[])
  12 {
  13         char *xembed;
  14         int tty;
  15         pid_t pgrp, tcpgrp;
  16
  17         if (argc < 3) {
  18                 fprintf(stderr, "usage: %s flag cmd ...\n", argv[0]);
  19                 return 2;
  20         }
  21
  22         if (!(xembed = getenv("XEMBED")))
  23                 goto noembed;
  24
  25         if ((tty = open("/dev/tty", O_RDONLY)) < 0)
  26                 goto noembed;
  27
  28         pgrp = getpgrp();
  29         tcpgrp = tcgetpgrp(tty);
  30
  31         close(tty);
  32
  33         if (pgrp == tcpgrp) { /* in foreground of tty */
  34                 argv[0] = argv[2];
  35                 argv[2] = xembed;
  36         } else {
  37 noembed:
  38                 argv += 2;
  39         }
  40
  41         execvp(argv[0], argv);
  42
  43         perror(argv[0]); /* failed to execute */
  44         return 1;
  45 }