tests/exit-wo-close.c

   1 /*
   2  * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <sys/wait.h>
  44 #include <fcntl.h>
  45 #include <unistd.h>
  46
  47 #include <err.h>
  48 #include <roken.h>
  49
  50 #ifdef RCSID
  51 RCSID("$Id$");
  52 #endif
  53
  54 static int
  55 child (const char *filename)
  56 {
  57     int fd;
  58     int ret;
  59
  60     fd = open (filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
  61     if (fd < 0)
  62         err (1, "open %s", filename);
  63     ret = write (fd, "hej", 3);
  64     if (ret != 3)
  65         err (1, "write %s", filename);
  66     return 0;
  67 }
  68
  69 static int
  70 parent (const char *filename, pid_t child_pid)
  71 {
  72     int stat;
  73     int ret;
  74     int fd;
  75     struct stat sb;
  76     char buf[3];
  77
  78     ret = waitpid (child_pid, &stat, 0);
  79     if (ret < 0)
  80         err (1, "waitpid %u", (unsigned)child_pid);
  81     if (!WIFEXITED(stat) || WEXITSTATUS(stat) != 0)
  82         errx (1, "weird child %u", (unsigned)child_pid);
  83     fd = open (filename, O_RDONLY, 0);
  84     if (fd < 0)
  85         err (1, "open %s", filename);
  86     ret = fstat (fd, &sb);
  87     if (ret < 0)
  88         err (1, "fstat %s", filename);
  89     if (sb.st_size != 3)
  90         errx (1, "size of %s = %u != 3", filename, (unsigned)sb.st_size);
  91     ret = read (fd, buf, sizeof(buf));
  92     if (ret < 0)
  93         err (1, "read %s", filename);
  94     if (ret != 3)
  95         errx (1, "short read from %s", filename);
  96     if (memcmp (buf, "hej", 3) != 0)
  97         errx (1, "bad contents of %s = `%.3s'\n", filename, buf);
  98     close (fd);
  99     return 0;
 100 }
 101
 102 static int
 103 doit (const char *filename)
 104 {
 105     pid_t pid;
 106
 107     pid = fork ();
 108     if (pid < 0)
 109         err (1, "fork");
 110
 111     if (pid == 0)
 112         return child (filename);
 113     else
 114         return parent (filename, pid);
 115 }
 116
 117 int
 118 main(int argc, char **argv)
 119 {
 120     const char *file = "foo";
 121
 122     setprogname (argv[0]);
 123
 124     if (argc != 2 && argc != 1)
 125         errx (1, "usage: %s [file]", argv[0]);
 126     if (argc == 2)
 127         file = argv[1];
 128     return doit (file);
 129 }