tests/lib/libc/stdio/t_fflush.c

   1 /*      $NetBSD: t_fflush.c,v 1.1 2011/09/11 05:15:55 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_fflush.c,v 1.1 2011/09/11 05:15:55 jruoho Exp $");
  33
  34 #include <atf-c.h>
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <unistd.h>
  38
  39 static const char *path = "fflush";
  40
  41 ATF_TC_WITH_CLEANUP(fflush_err);
  42 ATF_TC_HEAD(fflush_err, tc)
  43 {
  44         atf_tc_set_md_var(tc, "descr", "Test errors from fflush(3)");
  45 }
  46
  47 ATF_TC_BODY(fflush_err, tc)
  48 {
  49         FILE *f;
  50
  51         f = fopen(path, "w");
  52
  53         ATF_REQUIRE(f != NULL);
  54         ATF_REQUIRE(fflush(NULL) == 0);
  55         ATF_REQUIRE(fclose(f) == 0);
  56
  57         f = fopen(path, "r");
  58         ATF_REQUIRE(f != NULL);
  59
  60         /*
  61          * In NetBSD the call should fail if the supplied
  62          * parameteris not an open stream or the stream is
  63          * not open for writing.
  64          */
  65         errno = 0;
  66         ATF_REQUIRE_ERRNO(EBADF, fflush(f) == EOF);
  67
  68         ATF_REQUIRE(fclose(f) == 0);
  69
  70         errno = 0;
  71         ATF_REQUIRE_ERRNO(EBADF, fflush(f) == EOF);
  72
  73         (void)unlink(path);
  74 }
  75
  76 ATF_TC_CLEANUP(fflush_err, tc)
  77 {
  78         (void)unlink(path);
  79 }
  80
  81 ATF_TC_WITH_CLEANUP(fflush_seek);
  82 ATF_TC_HEAD(fflush_seek, tc)
  83 {
  84         atf_tc_set_md_var(tc, "descr", "Test file offsets with fflush(3)");
  85 }
  86
  87 ATF_TC_BODY(fflush_seek, tc)
  88 {
  89         char buf[12];
  90         int fd = -1;
  91         FILE *f;
  92
  93         /*
  94          * IEEE Std 1003.1-2008:
  95          *
  96          * "For a stream open for reading, if the file
  97          *  is not already at EOF, and the file is one
  98          *  capable of seeking, the file offset of the
  99          *  underlying open file description shall be
 100          *  adjusted so that the next operation on the
 101          *  open file description deals with the byte
 102          *  after the last one read from or written to
 103          *  the stream being flushed."
 104          */
 105         f = fopen(path, "w");
 106         ATF_REQUIRE(f != NULL);
 107
 108         ATF_REQUIRE(fwrite("garbage", 1, 7, f) == 7);
 109         ATF_REQUIRE(fclose(f) == 0);
 110
 111         f = fopen(path, "r+");
 112         ATF_REQUIRE(f != NULL);
 113
 114         fd = fileno(f);
 115         ATF_REQUIRE(fd != -1);
 116
 117         ATF_REQUIRE(fread(buf, 1, 3, f) == 3);
 118         ATF_REQUIRE(fflush(f) == 0);
 119         ATF_REQUIRE(fseek(f, 0, SEEK_CUR) == 0);
 120
 121         /*
 122          * Verify that the offsets are right and that
 123          * a read operation resumes at the correct location.
 124          */
 125         ATF_REQUIRE(ftell(f) == 3);
 126         ATF_REQUIRE(lseek(fd, 0, SEEK_CUR) == 3);
 127         ATF_REQUIRE(fgetc(f) == 'b');
 128
 129         ATF_REQUIRE(fclose(f) == 0);
 130         ATF_REQUIRE(unlink(path) == 0);
 131 }
 132
 133 ATF_TC_CLEANUP(fflush_seek, tc)
 134 {
 135         (void)unlink(path);
 136 }
 137
 138 ATF_TC_WITH_CLEANUP(fpurge_err);
 139 ATF_TC_HEAD(fpurge_err, tc)
 140 {
 141         atf_tc_set_md_var(tc, "descr", "Test errors from fpurge(3)");
 142 }
 143
 144 ATF_TC_BODY(fpurge_err, tc)
 145 {
 146         FILE *f;
 147
 148         f = fopen(path, "w");
 149         ATF_REQUIRE(f != NULL);
 150         ATF_REQUIRE(fclose(f) == 0);
 151
 152         errno = 0;
 153         ATF_REQUIRE_ERRNO(EBADF, fpurge(f) == EOF);
 154
 155         (void)unlink(path);
 156 }
 157
 158 ATF_TC_CLEANUP(fpurge_err, tc)
 159 {
 160         (void)unlink(path);
 161 }
 162
 163 ATF_TP_ADD_TCS(tp)
 164 {
 165
 166         ATF_TP_ADD_TC(tp, fflush_err);
 167         ATF_TP_ADD_TC(tp, fflush_seek);
 168         ATF_TP_ADD_TC(tp, fpurge_err);
 169
 170         return atf_no_error();
 171 }