| /* Common definitions for pread and pwrite. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <error.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/stat.h> |
| |
| static void do_prepare (void); |
| #define PREPARE(argc, argv) do_prepare () |
| static int do_test (void); |
| #define TEST_FUNCTION do_test () |
| |
| /* We might need a bit longer timeout. */ |
| #define TIMEOUT 20 /* sec */ |
| |
| /* This defines the `main' function and some more. */ |
| #include <test-skeleton.c> |
| |
| /* These are for the temporary file we generate. */ |
| static char *name; |
| static int fd; |
| |
| static void |
| do_prepare (void) |
| { |
| fd = create_temp_file ("tst-preadwrite.", &name); |
| if (fd == -1) |
| error (EXIT_FAILURE, errno, "cannot create temporary file"); |
| } |
| |
| |
| static ssize_t |
| do_test_with_offset (off_t offset) |
| { |
| char buf[1000]; |
| char res[1000]; |
| int i; |
| ssize_t ret; |
| |
| memset (buf, '\0', sizeof (buf)); |
| memset (res, '\xff', sizeof (res)); |
| |
| if (write (fd, buf, sizeof (buf)) != sizeof (buf)) |
| error (EXIT_FAILURE, errno, "during write"); |
| |
| for (i = 100; i < 200; ++i) |
| buf[i] = i; |
| ret = pwrite (fd, buf + 100, 100, offset + 100); |
| if (ret == -1) |
| error (EXIT_FAILURE, errno, "during pwrite"); |
| |
| for (i = 450; i < 600; ++i) |
| buf[i] = i; |
| ret = pwrite (fd, buf + 450, 150, offset + 450); |
| if (ret == -1) |
| error (EXIT_FAILURE, errno, "during pwrite"); |
| |
| ret = pread (fd, res, sizeof (buf) - 50, offset + 50); |
| if (ret == -1) |
| error (EXIT_FAILURE, errno, "during pread"); |
| |
| if (memcmp (buf + 50, res, ret) != 0) |
| { |
| printf ("error: read of pread != write of pwrite\n"); |
| return -1; |
| } |
| |
| return ret; |
| } |