src/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 #include <signal.h>
  43
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46 #include <sys/wait.h>
  47 #include <unistd.h>
  48 #include <dirent.h>
  49
  50 #include <err.h>
  51
  52 static void
  53 emkdir(const char *path, mode_t mode)
  54 {
  55     int ret = mkdir(path, mode);
  56     if (ret < 0)
  57         err(1, "mkdir %s", path);
  58 }
  59
  60 static pid_t child_pid;
  61
  62 static sig_atomic_t term_sig = 0;
  63
  64 static void
  65 child_sigterm(int signo)
  66 {
  67     term_sig = 1;
  68 }
  69
  70 static int
  71 child_chdir(const char *path)
  72 {
  73     int ret;
  74     int pfd[2];
  75
  76     ret = pipe(pfd);
  77     if (ret < 0)
  78         err(1, "pipe");
  79
  80     child_pid = fork();
  81     if (child_pid < 0)
  82         err(1, "fork");
  83     if (child_pid != 0) {
  84         close(pfd[1]);
  85         return pfd[0];
  86     } else {
  87         char buf[256];
  88         struct sigaction sa;
  89         FILE *fp;
  90
  91         sa.sa_handler = child_sigterm;
  92         sigfillset(&sa.sa_mask);
  93         sa.sa_flags = 0;
  94         sigaction(SIGTERM, &sa, NULL);
  95
  96         close(pfd[0]);
  97         ret = chdir(path);
  98         if (ret < 0)
  99             err(1, "chdir %s", path);
 100         ret = write(pfd[1], "", 1);
 101         if (ret != 1)
 102             err(1, "write");
 103         while (!term_sig)
 104             pause();
 105 #if 0
 106         if (getcwd(buf, sizeof(buf)) == NULL)
 107             err(1, "getcwd");
 108 #endif
 109         fp = fdopen(4, "w");
 110         if (fp != NULL)
 111             fprintf(fp, "child: cwd = %s\n", buf);
 112         exit(0);
 113     }
 114 }
 115
 116 static void
 117 kill_child(void)
 118 {
 119     kill(child_pid, SIGTERM);
 120 }
 121
 122 int
 123 main(int argc, char **argv)
 124 {
 125     struct stat sb;
 126     int ret;
 127     int fd;
 128     char buf[1];
 129     int status;
 130
 131
 132     emkdir("one", 0777);
 133     emkdir("two", 0777);
 134     emkdir("one/a", 0777);
 135
 136     fd = child_chdir("one/a");
 137     atexit(kill_child);
 138     ret = read(fd, buf, 1);
 139     if (ret < 0)
 140         err(1, "read");
 141     if (ret == 0)
 142         errx(1, "EOF on read");
 143
 144     ret = rename("one/a", "two/a");
 145     if (ret < 0)
 146         err(1, "rename one/a two");
 147     ret = lstat("two/a", &sb);
 148     if (ret < 0)
 149         err(1, "lstat two/a");
 150     ret = lstat("one/a", &sb);
 151     if (ret != -1 || errno != ENOENT)
 152         errx(1, "one/a still exists");
 153     kill_child();
 154     waitpid(child_pid, &status, 0);
 155     ret = lstat("one/a", &sb);
 156     if (ret != -1 || errno != ENOENT)
 157         errx(1, "one/a still exists after child");
 158     if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
 159         rmdir("one/a");
 160         rmdir("two/a");
 161         rmdir("one");
 162         rmdir("two");
 163         return 0;
 164     } else
 165         return 1;
 166 }