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80 lines
1.4 KiB
80 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*/
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/*
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* DESCRIPTION
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* Testcase to check that write() sets errno to EAGAIN
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*
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* ALGORITHM
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* Create a named pipe (fifo), open it in O_NONBLOCK mode, and
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* attempt to write to it when it is full, write(2) should fail
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*/
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include "tst_test.h"
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static char fifo[100];
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static int rfd, wfd;
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static long page_size;
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static void verify_write(void)
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{
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char wbuf[8 * page_size];
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TEST(write(wfd, wbuf, sizeof(wbuf)));
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if (TST_RET != -1) {
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tst_res(TFAIL, "write() succeeded unexpectedly");
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return;
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}
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if (TST_ERR != EAGAIN) {
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tst_res(TFAIL | TTERRNO,
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"write() failed unexpectedly, expected EAGAIN");
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return;
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}
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tst_res(TPASS | TTERRNO, "write() failed expectedly");
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}
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static void setup(void)
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{
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page_size = getpagesize();
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char wbuf[17 * page_size];
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sprintf(fifo, "%s.%d", fifo, getpid());
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SAFE_MKNOD(fifo, S_IFIFO | 0777, 0);
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rfd = SAFE_OPEN(fifo, O_RDONLY | O_NONBLOCK);
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wfd = SAFE_OPEN(fifo, O_WRONLY | O_NONBLOCK);
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SAFE_WRITE(0, wfd, wbuf, sizeof(wbuf));
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}
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static void cleanup(void)
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{
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if (rfd > 0)
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SAFE_CLOSE(rfd);
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if (wfd > 0)
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SAFE_CLOSE(wfd);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_write,
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};
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