Mercurial > gnulib
annotate tests/test-read.c @ 40196:e63f5d3edab5
relocatable-prog: Update documentation.
* doc/relocatable-maint.texi (Supporting Relocation): Update to match
the recent changes.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 24 Feb 2019 01:49:15 +0100 |
| parents | b06060465f09 |
| children |
| rev | line source |
|---|---|
| 15694 | 1 /* Test the read() function. |
|
40057
b06060465f09
maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
parents:
19484
diff
changeset
|
2 Copyright (C) 2011-2019 Free Software Foundation, Inc. |
| 15694 | 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 of the License, or | |
| 7 (at your option) 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 | |
| 19190 | 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 15694 | 16 |
| 17 #include <config.h> | |
| 18 | |
| 19 #include <unistd.h> | |
| 20 | |
| 21 #include "signature.h" | |
| 22 SIGNATURE_CHECK (read, ssize_t, (int, void *, size_t)); | |
| 23 | |
| 24 #include <errno.h> | |
| 25 #include <fcntl.h> | |
| 26 #include <string.h> | |
| 27 | |
| 28 #include "macros.h" | |
| 29 | |
| 30 int | |
| 31 main (void) | |
| 32 { | |
| 33 const char *filename = "test-read.tmp"; | |
| 34 int fd; | |
| 35 | |
| 36 /* Create a file with a simple contents. */ | |
| 37 fd = open (filename, O_CREAT | O_WRONLY, 0600); | |
| 38 ASSERT (fd >= 0); | |
| 39 ASSERT (write (fd, "Hello World", 11) == 11); | |
| 40 ASSERT (close (fd) == 0); | |
| 41 | |
| 42 /* Read from the middle of the file. */ | |
| 43 fd = open (filename, O_RDONLY); | |
| 44 ASSERT (fd >= 0); | |
| 45 ASSERT (lseek (fd, 6, SEEK_SET) == 6); | |
| 46 { | |
| 47 char buf[10]; | |
| 48 ssize_t ret = read (fd, buf, 10); | |
| 49 ASSERT (ret == 5); | |
| 50 ASSERT (memcmp (buf, "World", 5) == 0); | |
| 51 } | |
| 52 ASSERT (close (fd) == 0); | |
| 53 | |
| 54 /* Test behaviour for invalid file descriptors. */ | |
| 55 { | |
| 56 char byte; | |
| 57 errno = 0; | |
| 58 ASSERT (read (-1, &byte, 1) == -1); | |
| 59 ASSERT (errno == EBADF); | |
| 60 } | |
| 61 { | |
| 62 char byte; | |
|
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tests: don't assume fd 99 is closed
Paul Eggert <eggert@cs.ucla.edu>
parents:
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diff
changeset
|
63 close (99); |
| 15694 | 64 errno = 0; |
| 65 ASSERT (read (99, &byte, 1) == -1); | |
| 66 ASSERT (errno == EBADF); | |
| 67 } | |
| 68 | |
| 69 /* Clean up. */ | |
| 70 unlink (filename); | |
| 71 | |
| 72 return 0; | |
| 73 } |