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109 lines
2.1 KiB
109 lines
2.1 KiB
7 months ago
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// 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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* 07/2001 Ported by John George
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* 04/2002 wjhuie sigset cleanups
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* 08/2007 Ricardo Salveti de Araujo <rsalveti@linux.vnet.ibm.com>
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*/
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/*
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* DESCRIPTION
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* Check the return value, and errnos of write(2)
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* - when the file descriptor is invalid - EBADF
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* - when the buf parameter is invalid - EFAULT
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* - on an attempt to write to a pipe that is not open for reading - EPIPE
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include "tst_test.h"
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static int fd;
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static int inv_fd = -1;
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static char b[32];
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static char *buf = b;
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static char *bad_addr;
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static int pipefd[2];
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static struct tcase {
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int *fd;
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char **buf;
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size_t size;
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int exp_errno;
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} tcases[] = {
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{&inv_fd, &buf, sizeof(buf), EBADF},
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{&fd, &bad_addr, sizeof(buf), EFAULT},
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{&pipefd[1], &buf, sizeof(buf), EPIPE},
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};
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static int sigpipe_cnt;
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static void sighandler(int sig)
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{
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if (sig == SIGPIPE)
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sigpipe_cnt++;
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}
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static void verify_write(unsigned int i)
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{
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struct tcase *tc = &tcases[i];
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sigpipe_cnt = 0;
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TEST(write(*tc->fd, *tc->buf, tc->size));
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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 != tc->exp_errno) {
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tst_res(TFAIL | TTERRNO,
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"write() failed unexpectedly, expected %s",
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tst_strerrno(tc->exp_errno));
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return;
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}
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if (tc->exp_errno == EPIPE && sigpipe_cnt != 1) {
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tst_res(TFAIL, "sigpipe_cnt = %i", sigpipe_cnt);
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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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fd = SAFE_OPEN("write_test", O_RDWR | O_CREAT, 0644);
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bad_addr = SAFE_MMAP(0, 1, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
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SAFE_PIPE(pipefd);
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SAFE_CLOSE(pipefd[0]);
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SAFE_SIGNAL(SIGPIPE, sighandler);
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}
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static void cleanup(void)
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{
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if (fd > 0)
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SAFE_CLOSE(fd);
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SAFE_MUNMAP(bad_addr, 1);
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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 = verify_write,
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.tcnt = ARRAY_SIZE(tcases),
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};
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