LCOV - GNU Libidn - gltests/test-fread.c

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 1  : /* Test of fread() function.
 2  : Copyright (C) 2011-2020 Free Software Foundation, Inc.
 3  : 
 4  : This program is free software; you can redistribute it and/or modify
 5  : it under the terms of the GNU General Public License as published by
 6  : the Free Software Foundation; either version 3, or (at your option)
 7  : any later version.
 8  : 
 9  : This program is distributed in the hope that it will be useful,
 10  : but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 12  : GNU General Public License for more details.
 13  : 
 14  : You should have received a copy of the GNU General Public License
 15  : along with this program; if not, see <https://www.gnu.org/licenses/>. */
 16  : 
 17  : #include <config.h>
 18  : 
 19  : #include <stdio.h>
 20  : 
 21  : #include "signature.h"
 22  : SIGNATURE_CHECK (fread, size_t, (void *, size_t, size_t, FILE *));
 23  : 
 24  : #include <errno.h>
 25  : #include <fcntl.h>
 26  : #include <unistd.h>
 27  : 
 28  : #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
 29  : # include "msvc-inval.h"
 30  : #endif
 31  : 
 32  : #include "macros.h"
 33  : 
 34  : int
 35  1 : main (int argc, char **argv)
 36  : {
 37  1 : const char *filename = "test-fread.txt";
 38  : 
 39  : /* We don't have an fread() function that installs an invalid parameter
 40  : handler so far. So install that handler here, explicitly. */
 41  : #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
 42  : && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
 43  : gl_msvc_inval_ensure_handler ();
 44  : #endif
 45  : 
 46  : /* Prepare a file. */
 47  : {
 48  1 : const char text[] = "hello world";
 49  1 : int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
 50  1 : ASSERT (fd >= 0);
 51  1 : ASSERT (write (fd, text, sizeof (text)) == sizeof (text));
 52  1 : ASSERT (close (fd) == 0);
 53  : }
 54  : 
 55  : /* Test that fread() sets errno if someone else closes the stream
 56  : fd behind the back of stdio. */
 57  : {
 58  1 : FILE *fp = fopen (filename, "r");
 59  : char buf[5];
 60  1 : ASSERT (fp != NULL);
 61  1 : ASSERT (close (fileno (fp)) == 0);
 62  1 : errno = 0;
 63  1 : ASSERT (fread (buf, 1, sizeof (buf), fp) == 0);
 64  1 : ASSERT (errno == EBADF);
 65  1 : ASSERT (ferror (fp));
 66  1 : fclose (fp);
 67  : }
 68  : 
 69  : /* Test that fread() sets errno if the stream was constructed with
 70  : an invalid file descriptor. */
 71  : {
 72  1 : FILE *fp = fdopen (-1, "r");
 73  1 : if (fp != NULL)
 74  : {
 75  : char buf[1];
 76  0 : errno = 0;
 77  0 : ASSERT (fread (buf, 1, 1, fp) == 0);
 78  0 : ASSERT (errno == EBADF);
 79  0 : ASSERT (ferror (fp));
 80  0 : fclose (fp);
 81  : }
 82  : }
 83  : {
 84  : FILE *fp;
 85  1 : close (99);
 86  1 : fp = fdopen (99, "r");
 87  1 : if (fp != NULL)
 88  : {
 89  : char buf[1];
 90  0 : errno = 0;
 91  0 : ASSERT (fread (buf, 1, 1, fp) == 0);
 92  0 : ASSERT (errno == EBADF);
 93  0 : ASSERT (ferror (fp));
 94  0 : fclose (fp);
 95  : }
 96  : }
 97  : 
 98  : /* Clean up. */
 99  1 : unlink (filename);
 100  : 
 101  1 : return 0;
 102  : }