Add fifo_open, a basic regression test for opening fifos, which tests
the blocking and non-blocking forms of open based on the POSIX spec for now O_NONBLOCK should be handled.
This commit is contained in:
Robert Watson
parent
e2d583aca4
commit
9c40729fdf
7
tools/regression/fifo/fifo_open/Makefile
Normal file
7
tools/regression/fifo/fifo_open/Makefile
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@ -0,0 +1,7 @@
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# $FreeBSD$
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PROG= fifo_open
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NO_MAN=
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WARNS= 3
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.include <bsd.prog.mk>
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474
tools/regression/fifo/fifo_open/fifo_open.c
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474
tools/regression/fifo/fifo_open/fifo_open.c
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/*-
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* Copyright (c) 2005 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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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 <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* Regression test to exercise various POSIX-defined parts of fifo behavior
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* described for open(2):
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*
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* O_NONBLOCK
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* When opening a FIFO with O_RDONLY or O_WRONLY set:
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*
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* - If O_NONBLOCK is set, an open() for reading-only shall return without
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* delay. An open() for writing-only shall return an error if no process
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* currently has the file open for reading.
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*
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* - If O_NONBLOCK is clear, an open() for reading-only shall block the
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* calling thread until a thread opens the file for writing. An open()
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* for writing-only shall block the calling thread until a thread opens
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* the file for reading.
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*
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* When opening a block special or character special file that supports
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* non-blocking opens:
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*
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* - If O_NONBLOCK is set, the open() function shall return without blocking
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* for the device to be ready or available. Subsequent behavior of the
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* device is device-specific.
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*
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* - If O_NONBLOCK is clear, the open() function shall block the calling
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* thread until the device is ready or available before returning.
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*
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* Special errors:
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*
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* [ENXIO]
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* O_NONBLOCK is set, the named file is a FIFO, O_WRONLY is set, and no
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* process has the file open for reading.
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*/
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/*
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* In order to test blocking/non-blocking behavior, test processes must
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* potentially block themselves until released. As bugs in blocking result
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* in processes that won't un-block, we must sacrifice a process to the task,
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* watching and potentially killing it after a time-out. The main test
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* process is never used to open or act directly on a fifo (other than to
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* create or unlink it) in order to avoid the main test process being
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* blocked.
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*/
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/*
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* All activity occurs within a temporary directory created early in the
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* test.
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*/
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char temp_dir[PATH_MAX];
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static void __unused
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atexit_temp_dir(void)
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{
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rmdir(temp_dir);
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}
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/*
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* Run a function in a particular test process.
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*/
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static int
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run_in_process(int (*func)(void), pid_t *pidp, const char *errstr)
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{
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pid_t pid;
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pid = fork();
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if (pid < 0) {
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warn("%s: run_in_process: fork", errstr);
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return (-1);
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}
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if (pid == 0)
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exit(func());
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if (pidp != NULL)
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*pidp = pid;
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return (0);
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}
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/*
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* Wait for a process on a timeout, and if the timeout expires, kill the
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* process. Test each second rather than waiting the full timeout at once to
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* minimize the amount of time spent hanging around unnecessarily.
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*/
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static int
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wait_and_timeout(pid_t pid, int timeout, int *status, const char *errstr)
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{
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pid_t wpid;
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int i;
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/*
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* Count up to the timeout, but do a non-hanging waitpid() after each
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* second so we can avoid waiting a lot of extra time.
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*/
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for (i = 0; i < timeout; i++) {
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wpid = waitpid(pid, status, WNOHANG);
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if (wpid < 0) {
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warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
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return (-1);
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}
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if (wpid == pid)
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return (0);
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sleep(1);
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}
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wpid = waitpid(pid, status, WNOHANG);
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if (wpid < 0) {
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warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
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return (-1);
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}
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if (wpid == pid)
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return (0);
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if (kill(pid, SIGTERM) < 0) {
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warn("%s: wait_and_timeout: kill %d", errstr, pid);
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return (-1);
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}
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wpid = waitpid(pid, status, 0);
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if (wpid < 0) {
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warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
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return (-1);
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}
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if (wpid != pid) {
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warn("%s: waitpid: returned %d not %d", errstr, wpid, pid);
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return (-1);
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}
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warnx("%s: process blocked", errstr);
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return (-1);
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}
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static int
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non_blocking_open_reader(void)
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{
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int fd;
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fd = open("testfifo", O_RDONLY | O_NONBLOCK);
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if (fd < 0)
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return (errno);
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close(fd);
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return (0);
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}
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static int
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non_blocking_open_writer(void)
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{
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int fd;
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fd = open("testfifo", O_WRONLY | O_NONBLOCK);
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if (fd < 0)
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return (errno);
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close(fd);
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return (0);
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}
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static int
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blocking_open_reader(void)
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{
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int fd;
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fd = open("testfifo", O_RDONLY);
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if (fd < 0)
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return (errno);
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close(fd);
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return (0);
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}
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static int
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blocking_open_writer(void)
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{
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int fd;
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fd = open("testfifo", O_WRONLY);
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if (fd < 0)
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return (errno);
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close(fd);
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return (0);
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}
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static void
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test_blocking_reader(void)
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{
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pid_t reader_pid, writer_pid, wpid;
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int error, status;
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if (mkfifo("testfifo", 0600) < 0)
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err(-1, "test_blocking_reader: mkfifo: testfifo");
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/*
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* Block a process in opening the fifo.
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*/
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if (run_in_process(blocking_open_reader, &reader_pid,
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"test_blocking_reader: blocking_open_reader") < 0) {
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(void)unlink("testfifo");
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exit(-1);
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}
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/*
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* Test that it blocked.
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*/
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sleep(5);
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wpid = waitpid(reader_pid, &status, WNOHANG);
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if (wpid < 0) {
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error = errno;
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(void)unlink("testfifo");
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errno = error;
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err(-1, "test_blocking_reader: waitpid %d", reader_pid);
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}
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if (wpid != 0 && wpid != reader_pid) {
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(void)unlink("testfifo");
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errx(-1, "test_blocking_reader: waitpid %d returned %d",
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reader_pid, wpid);
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}
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if (wpid == reader_pid) {
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(void)unlink("testfifo");
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errx(-1, "test_blocking_reader: blocking child didn't "
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"block");
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}
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/*
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* Unblock the blocking reader.
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*/
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if (run_in_process(blocking_open_writer, &writer_pid,
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"test_blocking_reader: blocking_open_writer") < 0) {
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(void)unlink("testfifo");
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(void)kill(reader_pid, SIGTERM);
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(void)waitpid(reader_pid, &status, 0);
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exit(-1);
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}
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/*
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* Make sure both processes exited quickly (<1 second) to make sure
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* they didn't block, and GC.
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*/
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if (wait_and_timeout(reader_pid, 1, &status,
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"test_blocking_reader: blocking_open_reader") < 0) {
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(void)unlink("testinfo");
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(void)kill(reader_pid, SIGTERM);
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(void)kill(writer_pid, SIGTERM);
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exit(-1);
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}
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if (wait_and_timeout(writer_pid, 1, &status,
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"test_blocking_reader: blocking_open_writer") < 0) {
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(void)unlink("testinfo");
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(void)kill(writer_pid, SIGTERM);
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exit(-1);
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}
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if (unlink("testfifo") < 0)
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err(-1, "test_blocking_reader: unlink: testfifo");
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}
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static void
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test_blocking_writer(void)
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{
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pid_t reader_pid, writer_pid, wpid;
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int error, status;
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if (mkfifo("testfifo", 0600) < 0)
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err(-1, "test_blocking_writer: mkfifo: testfifo");
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/*
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* Block a process in opening the fifo.
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*/
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if (run_in_process(blocking_open_writer, &writer_pid,
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"test_blocking_writer: blocking_open_writer") < 0) {
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(void)unlink("testfifo");
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exit(-1);
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}
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/*
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* Test that it blocked.
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*/
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sleep(5);
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wpid = waitpid(writer_pid, &status, WNOHANG);
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if (wpid < 0) {
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error = errno;
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(void)unlink("testfifo");
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errno = error;
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err(-1, "test_blocking_writer: waitpid %d", writer_pid);
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}
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if (wpid != 0 && wpid != writer_pid) {
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(void)unlink("testfifo");
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errx(-1, "test_blocking_writer: waitpid %d returned %d",
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writer_pid, wpid);
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}
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if (wpid == writer_pid) {
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(void)unlink("testfifo");
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errx(-1, "test_blocking_writer: blocking child didn't "
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"block");
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}
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/*
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* Unblock the blocking writer.
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*/
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if (run_in_process(blocking_open_reader, &reader_pid,
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"test_blocking_writer: blocking_open_reader") < 0) {
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(void)unlink("testfifo");
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(void)kill(writer_pid, SIGTERM);
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(void)waitpid(writer_pid, &status, 0);
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exit(-1);
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}
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/*
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* Make sure both processes exited quickly (<1 second) to make sure
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* they didn't block, and GC.
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*/
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if (wait_and_timeout(writer_pid, 1, &status,
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"test_blocking_writer: blocking_open_writer") < 0) {
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(void)unlink("testinfo");
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(void)kill(writer_pid, SIGTERM);
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(void)kill(reader_pid, SIGTERM);
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(void)waitpid(writer_pid, &status, 0);
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(void)waitpid(reader_pid, &status, 0);
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exit(-1);
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}
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if (wait_and_timeout(reader_pid, 1, &status,
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"test_blocking_writer: blocking_open_reader") < 0) {
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(void)unlink("testinfo");
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(void)kill(reader_pid, SIGTERM);
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(void)waitpid(reader_pid, &status, 0);
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exit(-1);
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}
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if (unlink("testfifo") < 0)
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err(-1, "test_blocking_writer: unlink: testfifo");
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}
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static void
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test_non_blocking_reader(void)
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{
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int status;
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pid_t pid;
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if (mkfifo("testfifo", 0600) < 0)
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err(-1, "test_non_blocking_reader: mkfifo: testfifo");
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if (run_in_process(non_blocking_open_reader, &pid,
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"test_non_blocking_reader: non_blocking_open_reader") < 0) {
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(void)unlink("testfifo");
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exit(-1);
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}
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status = -1;
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if (wait_and_timeout(pid, 5, &status,
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"test_non_blocking_reader: non_blocking_open_reader") < 0) {
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(void)unlink("testfifo");
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exit(-1);
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}
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if (WEXITSTATUS(status) != 0) {
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(void)unlink("testfifo");
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errno = WEXITSTATUS(status);
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err(-1, "test_non_blocking_reader: "
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"non_blocking_open_reader: open: testfifo");
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}
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if (unlink("testfifo") < 0)
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err(-1, "test_non_blocking_reader: unlink: testfifo");
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}
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static void
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test_non_blocking_writer(void)
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{
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int status;
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pid_t pid;
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if (mkfifo("testfifo", 0600) < 0)
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err(-1, "test_non_blocking_writer: mkfifo: testfifo");
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if (run_in_process(non_blocking_open_writer, &pid,
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"test_non_blocking_writer: non_blocking_open_writer") < 0) {
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(void)unlink("testfifo");
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exit(-1);
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}
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status = -1;
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if (wait_and_timeout(pid, 5, &status,
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"test_non_blocking_writer: non_blocking_open_writer") < 0) {
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(void)unlink("testfifo");
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exit(-1);
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}
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if (WEXITSTATUS(status) != ENXIO) {
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(void)unlink("testfifo");
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errno = WEXITSTATUS(status);
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if (errno == 0)
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errx(-1, "test_non_blocking_writer: "
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"non_blocking_open_writer: open succeeded");
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err(-1, "test_non_blocking_writer: "
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"non_blocking_open_writer: open: testfifo");
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}
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if (unlink("testfifo") < 0)
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err(-1, "test_non_blocking_writer: unlink: testfifo");
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}
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int
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main(int argc, char *argv[])
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{
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if (geteuid() != 0)
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errx(-1, "must be run as root");
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strcpy(temp_dir, "/tmp/fifo_create.XXXXXXXXXXX");
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if (mkdtemp(temp_dir) == NULL)
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err(-1, "mkdtemp");
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atexit(atexit_temp_dir);
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test_non_blocking_reader();
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test_non_blocking_writer();
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test_blocking_reader();
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test_blocking_writer();
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return (0);
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}
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