blindtty.c

   1 /*
   2  * blindtty - run command in a detached terminal
   3  *
   4  * Usage: blindtty CMD [ARGS]...
   5  *
   6  * You might find it useful to run it as "setsid blindtty CMD...".
   7  *
   8  * Copyright (c) 2006  Petr Baudis, Jan Sembera
   9  */
  10
  11 /*
  12  * 'But the night will be too short,' said Gandalf. 'I have come back here,
  13  * for I must have a little peace, alone. You should sleep, in a bed while you
  14  * still may. At the sunrise I shall take you to the Lord Denethor again. No,
  15  * when the summons comes, not at sunrise. The Darkness has begun. There will
  16  * be no dawn.'
  17  */
  18
  19 #include <pty.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24
  25
  26 void
  27 sigchld(int s)
  28 {
  29         _exit(0);
  30 }
  31
  32 int
  33 main(int argc, char *argv[])
  34 {
  35         int ptm;
  36         pid_t pid;
  37
  38         if (argc < 2) {
  39                 fprintf(stderr, "Usage: blindtty CMD [ARG]...\n");
  40                 return 1;
  41         }
  42
  43         pid = forkpty(&ptm, NULL, NULL, NULL);
  44         if (!pid) {
  45                 int i; for (i=0; i<argc; i++) argv[i] = argv[i+1]; argv[i]=NULL;
  46                 execvp(argv[0], argv);
  47                 perror("execvp() failed");
  48                 return 2;
  49         }
  50
  51         printf("%s started with pid %d\n", argv[1], pid);
  52
  53         signal(SIGCHLD, sigchld);
  54
  55         while (1) {
  56                 char buf[1024];
  57                 if (read(ptm, buf, 1024) <= 0)
  58                         _exit(0);
  59         }
  60
  61         return 0;
  62 }