tests/lib/libc/sys/t_write.c

   1 /* $NetBSD: t_write.c,v 1.2 2011/10/19 16:19:30 jruoho Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001, 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __COPYRIGHT("@(#) Copyright (c) 2008\
  31  The NetBSD Foundation, inc. All rights reserved.");
  32 __RCSID("$NetBSD: t_write.c,v 1.2 2011/10/19 16:19:30 jruoho Exp $");
  33
  34 #include <sys/uio.h>
  35 #include <sys/syslimits.h>
  36
  37 #include <atf-c.h>
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <signal.h>
  41 #include <stdio.h>
  42 #include <stdint.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 static void              sighandler(int);
  47
  48 static bool              fail = false;
  49 static const char       *path = "write";
  50
  51 static void
  52 sighandler(int signo)
  53 {
  54         fail = false;
  55 }
  56
  57 ATF_TC_WITH_CLEANUP(write_err);
  58 ATF_TC_HEAD(write_err, tc)
  59 {
  60         atf_tc_set_md_var(tc, "descr", "Checks errors from write(2)");
  61 }
  62
  63 ATF_TC_BODY(write_err, tc)
  64 {
  65         char rbuf[3] = { 'a', 'b', 'c' };
  66         char wbuf[3] = { 'x', 'y', 'z' };
  67         int fd;
  68
  69         errno = 0;
  70         ATF_REQUIRE_ERRNO(EBADF, write(-1, wbuf, sizeof(wbuf)) == -1);
  71
  72         fd = open(path, O_RDWR | O_CREAT);
  73
  74         if (fd >= 0) {
  75
  76                 errno = 0;
  77                 ATF_REQUIRE_ERRNO(0, write(fd, wbuf, 3) == 3);
  78
  79                 errno = 0;
  80                 ATF_REQUIRE_ERRNO(EINVAL, write(fd, wbuf, SIZE_MAX) == -1);
  81
  82                 errno = 0;
  83                 ATF_REQUIRE_ERRNO(EFAULT, write(fd, (void *)-1, 1) == -1);
  84
  85                 /*
  86                  * Check that the above bogus write(2)
  87                  * calls did not corrupt the file.
  88                  */
  89                 ATF_REQUIRE(lseek(fd, 0, SEEK_SET) == 0);
  90                 ATF_REQUIRE(read(fd, rbuf, 3) == 3);
  91                 ATF_REQUIRE(memcmp(rbuf, wbuf, 3) == 0);
  92
  93                 (void)close(fd);
  94                 (void)unlink(path);
  95         }
  96 }
  97
  98 ATF_TC_CLEANUP(write_err, tc)
  99 {
 100         (void)unlink(path);
 101 }
 102
 103 ATF_TC(write_pipe);
 104 ATF_TC_HEAD(write_pipe, tc)
 105 {
 106         atf_tc_set_md_var(tc, "descr", "Checks for EPIPE from write(2)");
 107 }
 108
 109 ATF_TC_BODY(write_pipe, tc)
 110 {
 111         int fds[2];
 112
 113         ATF_REQUIRE(pipe(fds) == 0);
 114         ATF_REQUIRE(signal(SIGPIPE, sighandler) == 0);
 115
 116         ATF_REQUIRE(write(fds[1], "x", 1) != -1);
 117         ATF_REQUIRE(close(fds[0]) == 0);
 118
 119         errno = 0;
 120         fail = true;
 121
 122         if (write(fds[1], "x", 1) != -1 || errno != EPIPE)
 123                 atf_tc_fail_nonfatal("expected EPIPE but write(2) succeeded");
 124
 125         ATF_REQUIRE(close(fds[1]) == 0);
 126
 127         if (fail != false)
 128                 atf_tc_fail_nonfatal("SIGPIPE was not raised");
 129 }
 130
 131 ATF_TC_WITH_CLEANUP(write_pos);
 132 ATF_TC_HEAD(write_pos, tc)
 133 {
 134         atf_tc_set_md_var(tc, "descr", "Checks that write(2) "
 135             "updates the file position");
 136 }
 137
 138 ATF_TC_BODY(write_pos, tc)
 139 {
 140         const size_t n = 123;
 141         size_t i;
 142         int fd;
 143
 144         fd = open(path, O_RDWR | O_CREAT);
 145         ATF_REQUIRE(fd >= 0);
 146
 147         for (i = 0; i < n; i++) {
 148                 ATF_REQUIRE(write(fd, "x", 1) == 1);
 149                 ATF_REQUIRE(lseek(fd, 0, SEEK_CUR) == (off_t)(i + 1));
 150         }
 151
 152         ATF_REQUIRE(close(fd) == 0);
 153         ATF_REQUIRE(unlink(path) == 0);
 154 }
 155
 156 ATF_TC_CLEANUP(write_pos, tc)
 157 {
 158         (void)unlink(path);
 159 }
 160
 161 ATF_TC_WITH_CLEANUP(write_ret);
 162 ATF_TC_HEAD(write_ret, tc)
 163 {
 164         atf_tc_set_md_var(tc, "descr", "Checks return values from write(2)");
 165 }
 166
 167 ATF_TC_BODY(write_ret, tc)
 168 {
 169         const size_t n = 99;
 170         char buf[123];
 171         size_t i, j;
 172         int fd;
 173
 174         fd = open(path, O_WRONLY | O_CREAT);
 175         ATF_REQUIRE(fd >= 0);
 176
 177         (void)memset(buf, 'x', sizeof(buf));
 178
 179         for (i = j = 0; i < n; i++)
 180                 j += write(fd, buf, sizeof(buf));
 181
 182         if (j != n * 123)
 183                 atf_tc_fail("inconsistent return values from write(2)");
 184
 185         (void)close(fd);
 186         (void)unlink(path);
 187 }
 188
 189 ATF_TC_CLEANUP(write_ret, tc)
 190 {
 191         (void)unlink(path);
 192 }
 193
 194 ATF_TC(writev_iovmax);
 195 ATF_TC_HEAD(writev_iovmax, tc)
 196 {
 197         atf_tc_set_md_var(tc, "timeout", "10");
 198         atf_tc_set_md_var(tc, "descr",
 199             "Checks that file descriptor is properly FILE_UNUSE()d "
 200             "when iovcnt is greater than IOV_MAX");
 201 }
 202
 203 ATF_TC_BODY(writev_iovmax, tc)
 204 {
 205         ssize_t retval;
 206
 207         (void)printf("Calling writev(2, NULL, IOV_MAX + 1)...\n");
 208
 209         errno = 0;
 210         retval = writev(2, NULL, IOV_MAX + 1);
 211
 212         ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval);
 213         ATF_REQUIRE_EQ_MSG(errno, EINVAL, "got: %s", strerror(errno));
 214 }
 215
 216 ATF_TP_ADD_TCS(tp)
 217 {
 218
 219         ATF_TP_ADD_TC(tp, write_err);
 220         ATF_TP_ADD_TC(tp, write_pipe);
 221         ATF_TP_ADD_TC(tp, write_pos);
 222         ATF_TP_ADD_TC(tp, write_ret);
 223         ATF_TP_ADD_TC(tp, writev_iovmax);
 224
 225         return atf_no_error();
 226 }