1 /* Test the read() function.
2 Copyright (C) 2011-2012 Free Software Foundation, Inc.
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 of the License, or
7 (at your option) any later version.
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.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "signature.h"
22 SIGNATURE_CHECK (read, ssize_t, (int, void *, size_t));
33 const char *filename = "test-read.tmp";
36 /* Create a file with a simple contents. */
37 fd = open (filename, O_CREAT | O_WRONLY, 0600);
39 ASSERT (write (fd, "Hello World", 11) == 11);
40 ASSERT (close (fd) == 0);
42 /* Read from the middle of the file. */
43 fd = open (filename, O_RDONLY);
45 ASSERT (lseek (fd, 6, SEEK_SET) == 6);
48 ssize_t ret = read (fd, buf, 10);
50 ASSERT (memcmp (buf, "World", 5) == 0);
52 ASSERT (close (fd) == 0);
54 /* Test behaviour for invalid file descriptors. */
58 ASSERT (read (-1, &byte, 1) == -1);
59 ASSERT (errno == EBADF);
64 ASSERT (read (99, &byte, 1) == -1);
65 ASSERT (errno == EBADF);