tests/rename-under-feet.c

   1 /*
   2  * Copyright (c) 2000 - 2001 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 <errno.h>
  42
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <sys/wait.h>
  46 #include <unistd.h>
  47 #include <dirent.h>
  48
  49 #include <roken.h>
  50
  51 #include <err.h>
  52
  53 RCSID("$Id$");
  54
  55 static void
  56 emkdir (const char *path, mode_t mode)
  57 {
  58     int ret = mkdir (path, mode);
  59     if (ret < 0)
  60         err (1, "mkdir %s", path);
  61 }
  62
  63 static pid_t child_pid;
  64
  65 static sig_atomic_t term_sig = 0;
  66
  67 static RETSIGTYPE
  68 child_sigterm (int signo)
  69 {
  70     term_sig = 1;
  71 }
  72
  73 static int
  74 child_chdir (const char *path)
  75 {
  76     int ret;
  77     int pfd[2];
  78
  79     ret = pipe (pfd);
  80     if (ret < 0)
  81         err (1, "pipe");
  82
  83     child_pid = fork ();
  84     if (child_pid < 0)
  85         err (1, "fork");
  86     if (child_pid != 0) {
  87         close (pfd[1]);
  88         return pfd[0];
  89     } else {
  90         char buf[256];
  91         struct sigaction sa;
  92         FILE *fp;
  93
  94         sa.sa_handler = child_sigterm;
  95         sigfillset(&sa.sa_mask);
  96         sa.sa_flags = 0;
  97         sigaction (SIGTERM, &sa, NULL);
  98
  99         close (pfd[0]);
 100         ret = chdir (path);
 101         if (ret < 0)
 102             err (1, "chdir %s", path);
 103         ret = write (pfd[1], "", 1);
 104         if (ret != 1)
 105             err (1, "write");
 106         while (!term_sig)
 107             pause ();
 108         if(getcwd (buf, sizeof(buf)) == NULL)
 109             err (1, "getcwd");
 110         fp = fdopen (4, "w");
 111         if (fp != NULL)
 112             fprintf (fp, "child: cwd = %s\n", buf);
 113         exit (0);
 114     }
 115 }
 116
 117 static void
 118 kill_child (void)
 119 {
 120     kill (child_pid, SIGTERM);
 121 }
 122
 123 int
 124 main (int argc, char **argv)
 125 {
 126     struct stat sb;
 127     int ret;
 128     int fd;
 129     char buf[1];
 130     int status;
 131
 132     setprogname (argv[0]);
 133
 134     emkdir ("one", 0777);
 135     emkdir ("two", 0777);
 136     emkdir ("one/a", 0777);
 137
 138     fd = child_chdir ("one/a");
 139     atexit (kill_child);
 140     ret = read (fd, buf, 1);
 141     if (ret < 0)
 142         err(1, "read");
 143     if (ret == 0)
 144         errx(1, "EOF on read");
 145
 146     ret = rename ("one/a", "two/a");
 147     if (ret < 0)
 148         err (1, "rename one/a two");
 149     ret = lstat ("two/a", &sb);
 150     if (ret < 0)
 151         err (1, "lstat two/a");
 152     ret = lstat ("one/a", &sb);
 153     if (ret != -1 || errno != ENOENT)
 154         errx (1, "one/a still exists");
 155     kill_child ();
 156     waitpid (child_pid, &status, 0);
 157     ret = lstat ("one/a", &sb);
 158     if (ret != -1 || errno != ENOENT)
 159         errx (1, "one/a still exists after child");
 160     if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
 161         return 0;
 162     else
 163         return 1;
 164 }