src/tests/test-parallel2.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 <sys/types.h>
  40 #include <sys/wait.h>
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43 #include <unistd.h>
  44
  45 #include <err.h>
  46
  47 #include <fcntl.h>
  48
  49 #define WORKER_TIMES 1000
  50 #define NUM_WORKER 100
  51
  52 static int
  53 getcwd_worker(int num)
  54 {
  55     char name[17];
  56     int i;
  57
  58     snprintf(name, sizeof(name), "%d", num);
  59     if (mkdir(name, 0777) < 0)
  60         err(1, "mkdir %s", name);
  61     if (chdir(name) < 0)
  62         err(1, "chdir %s", name);
  63     for (i = 0; i < WORKER_TIMES; ++i) {
  64         char buf[256];
  65
  66         getcwd(buf, sizeof(buf));
  67     }
  68     return 0;
  69 }
  70
  71 static int
  72 mkdir_worker(int num)
  73 {
  74     int i;
  75
  76     for (i = 0; i < WORKER_TIMES; ++i) {
  77         char name[256];
  78
  79         snprintf(name, sizeof(name), "m%d-%d", num, i);
  80         mkdir(name, 0777);
  81     }
  82     return 0;
  83 }
  84
  85 static int
  86 mkdir_rmdir_worker(int num)
  87 {
  88     int i;
  89
  90     for (i = 0; i < WORKER_TIMES; ++i) {
  91         char name[256];
  92
  93         snprintf(name, sizeof(name), "rm%d-%d", num, i);
  94         mkdir(name, 0777);
  95     }
  96     for (i = 0; i < WORKER_TIMES; ++i) {
  97         char name[256];
  98
  99         snprintf(name, sizeof(name), "rm%d-%d", num, i);
 100         rmdir(name);
 101     }
 102     return 0;
 103 }
 104
 105 static int
 106 rename_worker(int num)
 107 {
 108     int i;
 109
 110     for (i = 0; i < WORKER_TIMES; ++i) {
 111         char name[256];
 112         int fd;
 113
 114         snprintf(name, sizeof(name), "rm%d-%d", num, i);
 115         fd = open(name, O_WRONLY | O_CREAT, 0777);
 116         close(fd);
 117     }
 118     for (i = 0; i < WORKER_TIMES; ++i) {
 119         char name[256], name2[256];
 120
 121         snprintf(name, sizeof(name), "rm%d-%d", num, i);
 122         snprintf(name2, sizeof(name2), "rn%d-%d", num, i);
 123         rename(name, name2);
 124     }
 125     return 0;
 126 }
 127
 128 static int
 129 stat_worker(int num)
 130 {
 131     char name[17];
 132     int i;
 133     char buf[256];
 134     struct stat sb;
 135
 136     snprintf(name, sizeof(name), "%d", num);
 137     if (mkdir(name, 0777) < 0)
 138         err(1, "mkdir %s", name);
 139     if (chdir(name) < 0)
 140         err(1, "chdir %s", name);
 141     for (i = 0; i < WORKER_TIMES; ++i) {
 142         getcwd(buf, sizeof(buf));
 143         stat(buf, &sb);
 144     }
 145     return 0;
 146 }
 147
 148 static int (*workers[]) (int) = {
 149 getcwd_worker, mkdir_worker, mkdir_rmdir_worker, rename_worker,
 150         stat_worker};
 151
 152 static int nworkers = sizeof(workers) / sizeof(*workers);
 153
 154 int
 155 main(int argc, char **argv)
 156 {
 157     int i, ret;
 158
 159
 160     for (i = 0; i < NUM_WORKER; i++) {
 161         int ret;
 162
 163         ret = fork();
 164         switch (ret) {
 165         case 0:
 166             return (*workers[i % nworkers]) (i);
 167         case -1:
 168             err(1, "fork");
 169         }
 170     }
 171     i = NUM_WORKER;
 172     while (i && wait(&ret)) {
 173         i--;
 174         if (ret)
 175             err(1, "wait: %d", ret);
 176     }
 177     return 0;
 178 }