tests/lib/libc/sys/t_mkfifo.c

   1 /* $NetBSD: t_mkfifo.c,v 1.2 2011/11/02 06:04:48 jruoho Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jukka Ruohonen.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: t_mkfifo.c,v 1.2 2011/11/02 06:04:48 jruoho Exp $");
  33
  34 #include <sys/stat.h>
  35 #include <sys/wait.h>
  36
  37 #include <atf-c.h>
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <limits.h>
  41 #include <stdlib.h>
  42 #include <signal.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 static const char       path[] = "fifo";
  47 static void             support(void);
  48
  49 static void
  50 support(void)
  51 {
  52
  53         errno = 0;
  54
  55         if (mkfifo(path, 0600) == 0) {
  56                 ATF_REQUIRE(unlink(path) == 0);
  57                 return;
  58         }
  59
  60         if (errno == EOPNOTSUPP)
  61                 atf_tc_skip("the kernel does not support FIFOs");
  62         else {
  63                 atf_tc_fail("mkfifo(2) failed");
  64         }
  65 }
  66
  67 ATF_TC_WITH_CLEANUP(mkfifo_block);
  68 ATF_TC_HEAD(mkfifo_block, tc)
  69 {
  70         atf_tc_set_md_var(tc, "descr", "Test that FIFOs block");
  71 }
  72
  73 ATF_TC_BODY(mkfifo_block, tc)
  74 {
  75         int sta, fd = -1;
  76         pid_t pid;
  77
  78         support();
  79
  80         ATF_REQUIRE(mkfifo(path, 0600) == 0);
  81
  82         pid = fork();
  83         ATF_REQUIRE(pid >= 0);
  84
  85         if (pid == 0) {
  86
  87                 /*
  88                  * If we open the FIFO as read-only (write-only),
  89                  * the call should block until another process
  90                  * opens the FIFO for writing (reading).
  91                  */
  92                 fd = open(path, O_RDONLY);
  93
  94                 _exit(EXIT_FAILURE); /* NOTREACHED */
  95         }
  96
  97         (void)sleep(1);
  98
  99         ATF_REQUIRE(kill(pid, SIGKILL) == 0);
 100
 101         (void)wait(&sta);
 102
 103         if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL)
 104                 atf_tc_fail("FIFO did not block");
 105
 106         (void)close(fd);
 107         (void)unlink(path);
 108 }
 109
 110 ATF_TC_CLEANUP(mkfifo_block, tc)
 111 {
 112         (void)unlink(path);
 113 }
 114
 115 ATF_TC_WITH_CLEANUP(mkfifo_err);
 116 ATF_TC_HEAD(mkfifo_err, tc)
 117 {
 118         atf_tc_set_md_var(tc, "descr", "Test erros from mkfifo(2)");
 119 }
 120
 121 ATF_TC_BODY(mkfifo_err, tc)
 122 {
 123         char buf[PATH_MAX + 1];
 124
 125         support();
 126
 127         (void)memset(buf, 'x', sizeof(buf));
 128         ATF_REQUIRE(mkfifo(path, 0600) == 0);
 129
 130         errno = 0;
 131         ATF_REQUIRE_ERRNO(EFAULT, mkfifo((char *)-1, 0600) == -1);
 132
 133         errno = 0;
 134         ATF_REQUIRE_ERRNO(EEXIST, mkfifo("/etc/passwd", 0600) == -1);
 135
 136         errno = 0;
 137         ATF_REQUIRE_ERRNO(EEXIST, mkfifo(path, 0600) == -1);
 138
 139         errno = 0;
 140         ATF_REQUIRE_ERRNO(ENAMETOOLONG, mkfifo(buf, 0600) == -1);
 141
 142         errno = 0;
 143         ATF_REQUIRE_ERRNO(ENOENT, mkfifo("/a/b/c/d/e/f/g", 0600) == -1);
 144
 145         ATF_REQUIRE(unlink(path) == 0);
 146 }
 147
 148 ATF_TC_CLEANUP(mkfifo_err, tc)
 149 {
 150         (void)unlink(path);
 151 }
 152
 153 ATF_TC_WITH_CLEANUP(mkfifo_nonblock);
 154 ATF_TC_HEAD(mkfifo_nonblock, tc)
 155 {
 156         atf_tc_set_md_var(tc, "descr", "Test O_NONBLOCK with FIFOs");
 157 }
 158
 159 ATF_TC_BODY(mkfifo_nonblock, tc)
 160 {
 161         int fd, sta;
 162         pid_t pid;
 163
 164         support();
 165
 166         fd = -1;
 167         ATF_REQUIRE(mkfifo(path, 0600) == 0);
 168
 169         pid = fork();
 170         ATF_REQUIRE(pid >= 0);
 171
 172         if (pid == 0) {
 173
 174                 /*
 175                  * If we open the FIFO as O_NONBLOCK, the O_RDONLY
 176                  * call should return immediately, whereas the call
 177                  * for write-only should fail with ENXIO.
 178                  */
 179                 fd = open(path, O_RDONLY | O_NONBLOCK);
 180
 181                 if (fd >= 0)
 182                         _exit(EXIT_SUCCESS);
 183
 184                 (void)pause();  /* NOTREACHED */
 185         }
 186
 187         (void)sleep(1);
 188
 189         errno = 0;
 190         ATF_REQUIRE_ERRNO(ENXIO, open(path, O_WRONLY | O_NONBLOCK) == -1);
 191
 192         (void)kill(pid, SIGKILL);
 193         (void)wait(&sta);
 194
 195         if (WIFSIGNALED(sta) != 0 || WTERMSIG(sta) == SIGKILL)
 196                 atf_tc_fail("FIFO blocked for O_NONBLOCK open(2)");
 197
 198         (void)close(fd);
 199         (void)unlink(path);
 200 }
 201
 202 ATF_TC_CLEANUP(mkfifo_nonblock, tc)
 203 {
 204         (void)unlink(path);
 205 }
 206
 207 ATF_TC_WITH_CLEANUP(mkfifo_perm);
 208 ATF_TC_HEAD(mkfifo_perm, tc)
 209 {
 210         atf_tc_set_md_var(tc, "descr", "Test permissions with mkfifo(2)");
 211         atf_tc_set_md_var(tc, "require.user", "unprivileged");
 212 }
 213
 214 ATF_TC_BODY(mkfifo_perm, tc)
 215 {
 216
 217         support();
 218
 219         errno = 0;
 220         ATF_REQUIRE_ERRNO(EACCES, mkfifo("/root/fifo", 0600) == -1);
 221
 222         ATF_REQUIRE(mkfifo(path, 0600) == 0);
 223
 224         /*
 225          * For some reason this fails with EFTYPE...
 226          */
 227         errno = 0;
 228         ATF_REQUIRE_ERRNO(EFTYPE, chmod(path, 1777) == -1);
 229
 230         ATF_REQUIRE(unlink(path) == 0);
 231 }
 232
 233 ATF_TC_CLEANUP(mkfifo_perm, tc)
 234 {
 235         (void)unlink(path);
 236 }
 237
 238 ATF_TC_WITH_CLEANUP(mkfifo_stat);
 239 ATF_TC_HEAD(mkfifo_stat, tc)
 240 {
 241         atf_tc_set_md_var(tc, "descr", "Test mkfifo(2) with stat");
 242 }
 243
 244 ATF_TC_BODY(mkfifo_stat, tc)
 245 {
 246         struct stat st;
 247
 248         support();
 249
 250         (void)memset(&st, 0, sizeof(struct stat));
 251
 252         ATF_REQUIRE(mkfifo(path, 0600) == 0);
 253         ATF_REQUIRE(stat(path, &st) == 0);
 254
 255         if (S_ISFIFO(st.st_mode) == 0)
 256                 atf_tc_fail("invalid mode from mkfifo(2)");
 257
 258         ATF_REQUIRE(unlink(path) == 0);
 259 }
 260
 261 ATF_TC_CLEANUP(mkfifo_stat, tc)
 262 {
 263         (void)unlink(path);
 264 }
 265
 266 ATF_TP_ADD_TCS(tp)
 267 {
 268
 269         ATF_TP_ADD_TC(tp, mkfifo_block);
 270         ATF_TP_ADD_TC(tp, mkfifo_err);
 271         ATF_TP_ADD_TC(tp, mkfifo_nonblock);
 272         ATF_TP_ADD_TC(tp, mkfifo_perm);
 273         ATF_TP_ADD_TC(tp, mkfifo_stat);
 274
 275         return atf_no_error();
 276 }