| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2001 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * DESCRIPTION |
| * Testcase to check that write() sets errno to EAGAIN |
| * |
| * ALGORITHM |
| * Create a named pipe (fifo), open it in O_NONBLOCK mode, and |
| * attempt to write to it when it is full, write(2) should fail |
| */ |
| |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <setjmp.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include "tst_test.h" |
| |
| static char fifo[100]; |
| static int rfd, wfd; |
| static long page_size; |
| |
| static void verify_write(void) |
| { |
| char wbuf[8 * page_size]; |
| |
| TEST(write(wfd, wbuf, sizeof(wbuf))); |
| |
| if (TST_RET != -1) { |
| tst_res(TFAIL, "write() succeeded unexpectedly"); |
| return; |
| } |
| |
| if (TST_ERR != EAGAIN) { |
| tst_res(TFAIL | TTERRNO, |
| "write() failed unexpectedly, expected EAGAIN"); |
| return; |
| } |
| |
| tst_res(TPASS | TTERRNO, "write() failed expectedly"); |
| } |
| |
| static void setup(void) |
| { |
| page_size = getpagesize(); |
| |
| char wbuf[17 * page_size]; |
| |
| sprintf(fifo, "%s.%d", fifo, getpid()); |
| |
| SAFE_MKNOD(fifo, S_IFIFO | 0777, 0); |
| |
| rfd = SAFE_OPEN(fifo, O_RDONLY | O_NONBLOCK); |
| wfd = SAFE_OPEN(fifo, O_WRONLY | O_NONBLOCK); |
| |
| SAFE_WRITE(0, wfd, wbuf, sizeof(wbuf)); |
| } |
| |
| static void cleanup(void) |
| { |
| if (rfd > 0) |
| SAFE_CLOSE(rfd); |
| |
| if (wfd > 0) |
| SAFE_CLOSE(wfd); |
| } |
| |
| static struct tst_test test = { |
| .needs_tmpdir = 1, |
| .setup = setup, |
| .cleanup = cleanup, |
| .test_all = verify_write, |
| }; |