lib/roken/test-detach.c

   1 /***********************************************************************
   2  * Copyright (c) 2015, Cryptonector LLC
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   4  *
   5  * Redistribution and use in source and binary forms, with or without
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  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  21  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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  30  **********************************************************************/
  31
  32 #include <config.h>
  33
  34 #include <sys/types.h>
  35 #include <err.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <errno.h>
  39 #include <string.h>
  40 #ifdef WIN32
  41 #include <process.h>
  42 #ifdef getpid
  43 #undef getpid
  44 #endif
  45 #define getpid _getpid
  46 #else
  47 #include <unistd.h>
  48 #endif
  49 #include "roken.h"
  50
  51 int main(int argc, char **argv)
  52 {
  53     char *ends;
  54     long n;
  55     int fd = -1;
  56
  57     if (argc > 1) {
  58         if (argc != 3)
  59             errx(1, "Usage: test-detach [--daemon-child fd]");
  60         fprintf(stderr, "Child started (argv[1] = %s, argv[2] = %s)!\n", argv[1], argv[2]);
  61         errno = 0;
  62         n = strtol(argv[2], &ends, 10);
  63         fd = n;
  64         if (errno != 0)
  65             err(1, "Usage: test-detach [--daemon-child fd]");
  66         if (n < 0 || ends == NULL || *ends != '\0' || n != fd)
  67             errx(1, "Usage: test-detach [--daemon-child fd]");
  68     } else {
  69         fprintf(stderr, "Parent started as %ld\n", (long)getpid());
  70         roken_detach_prep(argc, argv, "--daemon-child");
  71     }
  72     fprintf(stderr, "Now should be the child: %ld\n", (long)getpid());
  73     roken_detach_finish(NULL, fd);
  74     /*
  75      * These printfs will not appear: stderr will have been replaced
  76      * with /dev/null.
  77      */
  78     fprintf(stderr, "Now should be the child: %ld, wrote to parent\n", (long)getpid());
  79     sleep(5);
  80     fprintf(stderr, "Daemon child done\n");
  81     return 0;
  82 }