LXR toybox/toys/example/hello.c

   1/* hello.c - A hello world program. (Simple template for new commands.)
   2 *
   3 * Copyright 2012 Rob Landley <rob@landley.net>
   4 *
   5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/
   6 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cmdbehav.html
   7 * See https://www.ietf.org/rfc/rfc3.txt
   8
   9USE_HELLO(NEWTOY(hello, 0, TOYFLAG_USR|TOYFLAG_BIN))
  10
  11config HELLO
  12  bool "hello"
  13  default n
  14  help
  15    usage: hello
  16
  17    A hello world program.
  18
  19    Mostly used as a simple template for adding new commands.
  20    Occasionally nice to smoketest kernel booting via "init=/usr/bin/hello".
  21*/
  22
  23#define FOR_hello
  24#include "toys.h"
  25
  26GLOBALS(
  27  int unused;
  28)
  29
  30void hello_main(void)
  31{
  32  xprintf("Hello world\n");
  33
  34  // Avoid kernel panic if run as init.
  35  if (getpid() == 1) wait(&TT.unused);
  36}
  37