LXR toybox/toys/posix/nohup.c

   1/* nohup.c - run commandline with SIGHUP blocked.
   2 *
   3 * Copyright 2011 Rob Landley <rob@landley.net>
   4 *
   5 * See http://opengroup.org/onlinepubs/9699919799/utilities/nohup.html
   6
   7USE_NOHUP(NEWTOY(nohup, "<1^", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(125)))
   8
   9config NOHUP
  10  bool "nohup"
  11  default y
  12  help
  13    usage: nohup COMMAND [ARG...]
  14
  15    Run a command that survives the end of its terminal.
  16
  17    Redirect tty on stdin to /dev/null, tty on stdout to "nohup.out".
  18*/
  19
  20#include "toys.h"
  21
  22void nohup_main(void)
  23{
  24  toys.exitval = 125;
  25  xsignal(SIGHUP, SIG_IGN);
  26  if (isatty(1)) {
  27    close(1);
  28    if (-1 == open("nohup.out", O_CREAT|O_APPEND|O_WRONLY,
  29        S_IRUSR|S_IWUSR ))
  30    {
  31      char *temp = getenv("HOME");
  32
  33      temp = xmprintf("%s/%s", temp ? temp : "", "nohup.out");
  34      xcreate(temp, O_CREAT|O_APPEND|O_WRONLY, 0600);
  35      free(temp);
  36    }
  37  }
  38  if (isatty(0)) {
  39    close(0);
  40    xopen_stdio("/dev/null", O_RDONLY);
  41  }
  42  toys.exitval = 0;
  43  xexec(toys.optargs);
  44}
  45