27 */
28
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <sys/wait.h>
32
33#include <err.h>
34#include <errno.h>
35#include <fcntl.h>
36#include <limits.h>
37#include <signal.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43/*
44 * Regression test to exercise various POSIX-defined parts of fifo behavior
45 * described for open(2):
46 *
47 * O_NONBLOCK
48 * When opening a FIFO with O_RDONLY or O_WRONLY set:
49 *
50 * - If O_NONBLOCK is set, an open() for reading-only shall return without
51 * delay. An open() for writing-only shall return an error if no process
52 * currently has the file open for reading.
53 *
54 * - If O_NONBLOCK is clear, an open() for reading-only shall block the
55 * calling thread until a thread opens the file for writing. An open()
56 * for writing-only shall block the calling thread until a thread opens
57 * the file for reading.
58 *
59 * When opening a block special or character special file that supports
60 * non-blocking opens:
61 *
62 * - If O_NONBLOCK is set, the open() function shall return without blocking
63 * for the device to be ready or available. Subsequent behavior of the
64 * device is device-specific.
65 *
66 * - If O_NONBLOCK is clear, the open() function shall block the calling
67 * thread until the device is ready or available before returning.
68 *
69 * Special errors:
70 *
71 * [ENXIO]
72 * O_NONBLOCK is set, the named file is a FIFO, O_WRONLY is set, and no
73 * process has the file open for reading.
74 */
75
76/*
77 * In order to test blocking/non-blocking behavior, test processes must
78 * potentially block themselves until released. As bugs in blocking result
79 * in processes that won't un-block, we must sacrifice a process to the task,
80 * watching and potentially killing it after a time-out. The main test
81 * process is never used to open or act directly on a fifo (other than to
82 * create or unlink it) in order to avoid the main test process being
83 * blocked.
84 */
85
86/*
87 * All activity occurs within a temporary directory created early in the
88 * test.
89 */
90static char temp_dir[PATH_MAX];
91
92static void __unused
93atexit_temp_dir(void)
94{
95
96 rmdir(temp_dir);
97}
98
99/*
100 * Run a function in a particular test process.
101 */
102static int
103run_in_process(int (*func)(void), pid_t *pidp, const char *errstr)
104{
105 pid_t pid;
106
107 pid = fork();
108 if (pid < 0) {
109 warn("%s: run_in_process: fork", errstr);
110 return (-1);
111 }
112
113 if (pid == 0)
114 exit(func());
115
116 if (pidp != NULL)
117 *pidp = pid;
118
119 return (0);
120}
121
122/*
123 * Wait for a process on a timeout, and if the timeout expires, kill the
124 * process. Test each second rather than waiting the full timeout at once to
125 * minimize the amount of time spent hanging around unnecessarily.
126 */
127static int
128wait_and_timeout(pid_t pid, int timeout, int *status, const char *errstr)
129{
130 pid_t wpid;
131 int i;
132
133 /*
134 * Count up to the timeout, but do a non-hanging waitpid() after each
135 * second so we can avoid waiting a lot of extra time.
136 */
137 for (i = 0; i < timeout; i++) {
138 wpid = waitpid(pid, status, WNOHANG);
139 if (wpid < 0) {
140 warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
141 return (-1);
142 }
143
144 if (wpid == pid)
145 return (0);
146
147 sleep(1);
148 }
149
150 wpid = waitpid(pid, status, WNOHANG);
151 if (wpid < 0) {
152 warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
153 return (-1);
154 }
155
156 if (wpid == pid)
157 return (0);
158
159 if (kill(pid, SIGTERM) < 0) {
160 warn("%s: wait_and_timeout: kill %d", errstr, pid);
161 return (-1);
162 }
163
164 wpid = waitpid(pid, status, 0);
165 if (wpid < 0) {
166 warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
167 return (-1);
168 }
169
170 if (wpid != pid) {
171 warn("%s: waitpid: returned %d not %d", errstr, wpid, pid);
172 return (-1);
173 }
174
175 warnx("%s: process blocked", errstr);
176 return (-1);
177}
178
179static int
180non_blocking_open_reader(void)
181{
182 int fd;
183
184 fd = open("testfifo", O_RDONLY | O_NONBLOCK);
185 if (fd < 0)
186 return (errno);
187 close(fd);
188
189 return (0);
190}
191
192static int
193non_blocking_open_writer(void)
194{
195 int fd;
196
197 fd = open("testfifo", O_WRONLY | O_NONBLOCK);
198 if (fd < 0)
199 return (errno);
200 close(fd);
201
202 return (0);
203}
204
205static int
206blocking_open_reader(void)
207{
208 int fd;
209
210 fd = open("testfifo", O_RDONLY);
211 if (fd < 0)
212 return (errno);
213 close(fd);
214
215 return (0);
216}
217
218static int
219blocking_open_writer(void)
220{
221 int fd;
222
223 fd = open("testfifo", O_WRONLY);
224 if (fd < 0)
225 return (errno);
226 close(fd);
227
228 return (0);
229}
230
231static void
232test_blocking_reader(void)
233{
234 pid_t reader_pid, writer_pid, wpid;
235 int error, status;
236
237 if (mkfifo("testfifo", 0600) < 0)
238 err(-1, "test_blocking_reader: mkfifo: testfifo");
239
240 /*
241 * Block a process in opening the fifo.
242 */
243 if (run_in_process(blocking_open_reader, &reader_pid,
244 "test_blocking_reader: blocking_open_reader") < 0) {
245 (void)unlink("testfifo");
246 exit(-1);
247 }
248
249 /*
250 * Test that it blocked.
251 */
252 sleep(5);
253 wpid = waitpid(reader_pid, &status, WNOHANG);
254 if (wpid < 0) {
255 error = errno;
256 (void)unlink("testfifo");
257 errno = error;
258 err(-1, "test_blocking_reader: waitpid %d", reader_pid);
259 }
260
261 if (wpid != 0 && wpid != reader_pid) {
262 (void)unlink("testfifo");
263 errx(-1, "test_blocking_reader: waitpid %d returned %d",
264 reader_pid, wpid);
265 }
266
267 if (wpid == reader_pid) {
268 (void)unlink("testfifo");
269 errx(-1, "test_blocking_reader: blocking child didn't "
270 "block");
271 }
272
273 /*
274 * Unblock the blocking reader.
275 */
276 if (run_in_process(blocking_open_writer, &writer_pid,
277 "test_blocking_reader: blocking_open_writer") < 0) {
278 (void)unlink("testfifo");
279 (void)kill(reader_pid, SIGTERM);
280 (void)waitpid(reader_pid, &status, 0);
281 exit(-1);
282 }
283
284 /*
285 * Make sure both processes exited quickly (<1 second) to make sure
286 * they didn't block, and GC.
287 */
288 if (wait_and_timeout(reader_pid, 1, &status,
289 "test_blocking_reader: blocking_open_reader") < 0) {
290 (void)unlink("testinfo");
291 (void)kill(reader_pid, SIGTERM);
292 (void)kill(writer_pid, SIGTERM);
293 exit(-1);
294 }
295
296 if (wait_and_timeout(writer_pid, 1, &status,
297 "test_blocking_reader: blocking_open_writer") < 0) {
298 (void)unlink("testinfo");
299 (void)kill(writer_pid, SIGTERM);
300 exit(-1);
301 }
302
303 if (unlink("testfifo") < 0)
304 err(-1, "test_blocking_reader: unlink: testfifo");
305}
306static void
307test_blocking_writer(void)
308{
309 pid_t reader_pid, writer_pid, wpid;
310 int error, status;
311
312 if (mkfifo("testfifo", 0600) < 0)
313 err(-1, "test_blocking_writer: mkfifo: testfifo");
314
315 /*
316 * Block a process in opening the fifo.
317 */
318 if (run_in_process(blocking_open_writer, &writer_pid,
319 "test_blocking_writer: blocking_open_writer") < 0) {
320 (void)unlink("testfifo");
321 exit(-1);
322 }
323
324 /*
325 * Test that it blocked.
326 */
327 sleep(5);
328 wpid = waitpid(writer_pid, &status, WNOHANG);
329 if (wpid < 0) {
330 error = errno;
331 (void)unlink("testfifo");
332 errno = error;
333 err(-1, "test_blocking_writer: waitpid %d", writer_pid);
334 }
335
336 if (wpid != 0 && wpid != writer_pid) {
337 (void)unlink("testfifo");
338 errx(-1, "test_blocking_writer: waitpid %d returned %d",
339 writer_pid, wpid);
340 }
341
342 if (wpid == writer_pid) {
343 (void)unlink("testfifo");
344 errx(-1, "test_blocking_writer: blocking child didn't "
345 "block");
346 }
347
348 /*
349 * Unblock the blocking writer.
350 */
351 if (run_in_process(blocking_open_reader, &reader_pid,
352 "test_blocking_writer: blocking_open_reader") < 0) {
353 (void)unlink("testfifo");
354 (void)kill(writer_pid, SIGTERM);
355 (void)waitpid(writer_pid, &status, 0);
356 exit(-1);
357 }
358
359 /*
360 * Make sure both processes exited quickly (<1 second) to make sure
361 * they didn't block, and GC.
362 */
363 if (wait_and_timeout(writer_pid, 1, &status,
364 "test_blocking_writer: blocking_open_writer") < 0) {
365 (void)unlink("testinfo");
366 (void)kill(writer_pid, SIGTERM);
367 (void)kill(reader_pid, SIGTERM);
368 (void)waitpid(writer_pid, &status, 0);
369 (void)waitpid(reader_pid, &status, 0);
370 exit(-1);
371 }
372
373 if (wait_and_timeout(reader_pid, 1, &status,
374 "test_blocking_writer: blocking_open_reader") < 0) {
375 (void)unlink("testinfo");
376 (void)kill(reader_pid, SIGTERM);
377 (void)waitpid(reader_pid, &status, 0);
378 exit(-1);
379 }
380
381 if (unlink("testfifo") < 0)
382 err(-1, "test_blocking_writer: unlink: testfifo");
383}
384
385static void
386test_non_blocking_reader(void)
387{
388 int status;
389 pid_t pid;
390
391 if (mkfifo("testfifo", 0600) < 0)
392 err(-1, "test_non_blocking_reader: mkfifo: testfifo");
393
394 if (run_in_process(non_blocking_open_reader, &pid,
395 "test_non_blocking_reader: non_blocking_open_reader") < 0) {
396 (void)unlink("testfifo");
397 exit(-1);
398 }
399
400 status = -1;
401 if (wait_and_timeout(pid, 5, &status,
402 "test_non_blocking_reader: non_blocking_open_reader") < 0) {
403 (void)unlink("testfifo");
404 exit(-1);
405 }
406
407 if (WEXITSTATUS(status) != 0) {
408 (void)unlink("testfifo");
409 errno = WEXITSTATUS(status);
410 err(-1, "test_non_blocking_reader: "
411 "non_blocking_open_reader: open: testfifo");
412 }
413
414 if (unlink("testfifo") < 0)
415 err(-1, "test_non_blocking_reader: unlink: testfifo");
416}
417
418static void
419test_non_blocking_writer(void)
420{
421 int status;
422 pid_t pid;
423
424 if (mkfifo("testfifo", 0600) < 0)
425 err(-1, "test_non_blocking_writer: mkfifo: testfifo");
426
427 if (run_in_process(non_blocking_open_writer, &pid,
428 "test_non_blocking_writer: non_blocking_open_writer") < 0) {
429 (void)unlink("testfifo");
430 exit(-1);
431 }
432
433 status = -1;
434 if (wait_and_timeout(pid, 5, &status,
435 "test_non_blocking_writer: non_blocking_open_writer") < 0) {
436 (void)unlink("testfifo");
437 exit(-1);
438 }
439
440 if (WEXITSTATUS(status) != ENXIO) {
441 (void)unlink("testfifo");
442
443 errno = WEXITSTATUS(status);
444 if (errno == 0)
445 errx(-1, "test_non_blocking_writer: "
446 "non_blocking_open_writer: open succeeded");
447 err(-1, "test_non_blocking_writer: "
448 "non_blocking_open_writer: open: testfifo");
449 }
450
451 if (unlink("testfifo") < 0)
452 err(-1, "test_non_blocking_writer: unlink: testfifo");
453}
454
455int
456main(void)
457{
458
459 if (geteuid() != 0)
460 errx(-1, "must be run as root");
461
462 strcpy(temp_dir, "fifo_open.XXXXXXXXXXX");
463 if (mkdtemp(temp_dir) == NULL)
464 err(-1, "mkdtemp");
465 if (chdir(temp_dir) < 0)
466 err(-1, "chdir: %s", temp_dir);
467 atexit(atexit_temp_dir);
468
469 test_non_blocking_reader();
470 test_non_blocking_writer();
471
472 test_blocking_reader();
473 test_blocking_writer();
474
475 return (0);
476}
| 27 */
28
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <sys/wait.h>
32
33#include <err.h>
34#include <errno.h>
35#include <fcntl.h>
36#include <limits.h>
37#include <signal.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43/*
44 * Regression test to exercise various POSIX-defined parts of fifo behavior
45 * described for open(2):
46 *
47 * O_NONBLOCK
48 * When opening a FIFO with O_RDONLY or O_WRONLY set:
49 *
50 * - If O_NONBLOCK is set, an open() for reading-only shall return without
51 * delay. An open() for writing-only shall return an error if no process
52 * currently has the file open for reading.
53 *
54 * - If O_NONBLOCK is clear, an open() for reading-only shall block the
55 * calling thread until a thread opens the file for writing. An open()
56 * for writing-only shall block the calling thread until a thread opens
57 * the file for reading.
58 *
59 * When opening a block special or character special file that supports
60 * non-blocking opens:
61 *
62 * - If O_NONBLOCK is set, the open() function shall return without blocking
63 * for the device to be ready or available. Subsequent behavior of the
64 * device is device-specific.
65 *
66 * - If O_NONBLOCK is clear, the open() function shall block the calling
67 * thread until the device is ready or available before returning.
68 *
69 * Special errors:
70 *
71 * [ENXIO]
72 * O_NONBLOCK is set, the named file is a FIFO, O_WRONLY is set, and no
73 * process has the file open for reading.
74 */
75
76/*
77 * In order to test blocking/non-blocking behavior, test processes must
78 * potentially block themselves until released. As bugs in blocking result
79 * in processes that won't un-block, we must sacrifice a process to the task,
80 * watching and potentially killing it after a time-out. The main test
81 * process is never used to open or act directly on a fifo (other than to
82 * create or unlink it) in order to avoid the main test process being
83 * blocked.
84 */
85
86/*
87 * All activity occurs within a temporary directory created early in the
88 * test.
89 */
90static char temp_dir[PATH_MAX];
91
92static void __unused
93atexit_temp_dir(void)
94{
95
96 rmdir(temp_dir);
97}
98
99/*
100 * Run a function in a particular test process.
101 */
102static int
103run_in_process(int (*func)(void), pid_t *pidp, const char *errstr)
104{
105 pid_t pid;
106
107 pid = fork();
108 if (pid < 0) {
109 warn("%s: run_in_process: fork", errstr);
110 return (-1);
111 }
112
113 if (pid == 0)
114 exit(func());
115
116 if (pidp != NULL)
117 *pidp = pid;
118
119 return (0);
120}
121
122/*
123 * Wait for a process on a timeout, and if the timeout expires, kill the
124 * process. Test each second rather than waiting the full timeout at once to
125 * minimize the amount of time spent hanging around unnecessarily.
126 */
127static int
128wait_and_timeout(pid_t pid, int timeout, int *status, const char *errstr)
129{
130 pid_t wpid;
131 int i;
132
133 /*
134 * Count up to the timeout, but do a non-hanging waitpid() after each
135 * second so we can avoid waiting a lot of extra time.
136 */
137 for (i = 0; i < timeout; i++) {
138 wpid = waitpid(pid, status, WNOHANG);
139 if (wpid < 0) {
140 warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
141 return (-1);
142 }
143
144 if (wpid == pid)
145 return (0);
146
147 sleep(1);
148 }
149
150 wpid = waitpid(pid, status, WNOHANG);
151 if (wpid < 0) {
152 warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
153 return (-1);
154 }
155
156 if (wpid == pid)
157 return (0);
158
159 if (kill(pid, SIGTERM) < 0) {
160 warn("%s: wait_and_timeout: kill %d", errstr, pid);
161 return (-1);
162 }
163
164 wpid = waitpid(pid, status, 0);
165 if (wpid < 0) {
166 warn("%s: wait_and_timeout: waitpid %d", errstr, pid);
167 return (-1);
168 }
169
170 if (wpid != pid) {
171 warn("%s: waitpid: returned %d not %d", errstr, wpid, pid);
172 return (-1);
173 }
174
175 warnx("%s: process blocked", errstr);
176 return (-1);
177}
178
179static int
180non_blocking_open_reader(void)
181{
182 int fd;
183
184 fd = open("testfifo", O_RDONLY | O_NONBLOCK);
185 if (fd < 0)
186 return (errno);
187 close(fd);
188
189 return (0);
190}
191
192static int
193non_blocking_open_writer(void)
194{
195 int fd;
196
197 fd = open("testfifo", O_WRONLY | O_NONBLOCK);
198 if (fd < 0)
199 return (errno);
200 close(fd);
201
202 return (0);
203}
204
205static int
206blocking_open_reader(void)
207{
208 int fd;
209
210 fd = open("testfifo", O_RDONLY);
211 if (fd < 0)
212 return (errno);
213 close(fd);
214
215 return (0);
216}
217
218static int
219blocking_open_writer(void)
220{
221 int fd;
222
223 fd = open("testfifo", O_WRONLY);
224 if (fd < 0)
225 return (errno);
226 close(fd);
227
228 return (0);
229}
230
231static void
232test_blocking_reader(void)
233{
234 pid_t reader_pid, writer_pid, wpid;
235 int error, status;
236
237 if (mkfifo("testfifo", 0600) < 0)
238 err(-1, "test_blocking_reader: mkfifo: testfifo");
239
240 /*
241 * Block a process in opening the fifo.
242 */
243 if (run_in_process(blocking_open_reader, &reader_pid,
244 "test_blocking_reader: blocking_open_reader") < 0) {
245 (void)unlink("testfifo");
246 exit(-1);
247 }
248
249 /*
250 * Test that it blocked.
251 */
252 sleep(5);
253 wpid = waitpid(reader_pid, &status, WNOHANG);
254 if (wpid < 0) {
255 error = errno;
256 (void)unlink("testfifo");
257 errno = error;
258 err(-1, "test_blocking_reader: waitpid %d", reader_pid);
259 }
260
261 if (wpid != 0 && wpid != reader_pid) {
262 (void)unlink("testfifo");
263 errx(-1, "test_blocking_reader: waitpid %d returned %d",
264 reader_pid, wpid);
265 }
266
267 if (wpid == reader_pid) {
268 (void)unlink("testfifo");
269 errx(-1, "test_blocking_reader: blocking child didn't "
270 "block");
271 }
272
273 /*
274 * Unblock the blocking reader.
275 */
276 if (run_in_process(blocking_open_writer, &writer_pid,
277 "test_blocking_reader: blocking_open_writer") < 0) {
278 (void)unlink("testfifo");
279 (void)kill(reader_pid, SIGTERM);
280 (void)waitpid(reader_pid, &status, 0);
281 exit(-1);
282 }
283
284 /*
285 * Make sure both processes exited quickly (<1 second) to make sure
286 * they didn't block, and GC.
287 */
288 if (wait_and_timeout(reader_pid, 1, &status,
289 "test_blocking_reader: blocking_open_reader") < 0) {
290 (void)unlink("testinfo");
291 (void)kill(reader_pid, SIGTERM);
292 (void)kill(writer_pid, SIGTERM);
293 exit(-1);
294 }
295
296 if (wait_and_timeout(writer_pid, 1, &status,
297 "test_blocking_reader: blocking_open_writer") < 0) {
298 (void)unlink("testinfo");
299 (void)kill(writer_pid, SIGTERM);
300 exit(-1);
301 }
302
303 if (unlink("testfifo") < 0)
304 err(-1, "test_blocking_reader: unlink: testfifo");
305}
306static void
307test_blocking_writer(void)
308{
309 pid_t reader_pid, writer_pid, wpid;
310 int error, status;
311
312 if (mkfifo("testfifo", 0600) < 0)
313 err(-1, "test_blocking_writer: mkfifo: testfifo");
314
315 /*
316 * Block a process in opening the fifo.
317 */
318 if (run_in_process(blocking_open_writer, &writer_pid,
319 "test_blocking_writer: blocking_open_writer") < 0) {
320 (void)unlink("testfifo");
321 exit(-1);
322 }
323
324 /*
325 * Test that it blocked.
326 */
327 sleep(5);
328 wpid = waitpid(writer_pid, &status, WNOHANG);
329 if (wpid < 0) {
330 error = errno;
331 (void)unlink("testfifo");
332 errno = error;
333 err(-1, "test_blocking_writer: waitpid %d", writer_pid);
334 }
335
336 if (wpid != 0 && wpid != writer_pid) {
337 (void)unlink("testfifo");
338 errx(-1, "test_blocking_writer: waitpid %d returned %d",
339 writer_pid, wpid);
340 }
341
342 if (wpid == writer_pid) {
343 (void)unlink("testfifo");
344 errx(-1, "test_blocking_writer: blocking child didn't "
345 "block");
346 }
347
348 /*
349 * Unblock the blocking writer.
350 */
351 if (run_in_process(blocking_open_reader, &reader_pid,
352 "test_blocking_writer: blocking_open_reader") < 0) {
353 (void)unlink("testfifo");
354 (void)kill(writer_pid, SIGTERM);
355 (void)waitpid(writer_pid, &status, 0);
356 exit(-1);
357 }
358
359 /*
360 * Make sure both processes exited quickly (<1 second) to make sure
361 * they didn't block, and GC.
362 */
363 if (wait_and_timeout(writer_pid, 1, &status,
364 "test_blocking_writer: blocking_open_writer") < 0) {
365 (void)unlink("testinfo");
366 (void)kill(writer_pid, SIGTERM);
367 (void)kill(reader_pid, SIGTERM);
368 (void)waitpid(writer_pid, &status, 0);
369 (void)waitpid(reader_pid, &status, 0);
370 exit(-1);
371 }
372
373 if (wait_and_timeout(reader_pid, 1, &status,
374 "test_blocking_writer: blocking_open_reader") < 0) {
375 (void)unlink("testinfo");
376 (void)kill(reader_pid, SIGTERM);
377 (void)waitpid(reader_pid, &status, 0);
378 exit(-1);
379 }
380
381 if (unlink("testfifo") < 0)
382 err(-1, "test_blocking_writer: unlink: testfifo");
383}
384
385static void
386test_non_blocking_reader(void)
387{
388 int status;
389 pid_t pid;
390
391 if (mkfifo("testfifo", 0600) < 0)
392 err(-1, "test_non_blocking_reader: mkfifo: testfifo");
393
394 if (run_in_process(non_blocking_open_reader, &pid,
395 "test_non_blocking_reader: non_blocking_open_reader") < 0) {
396 (void)unlink("testfifo");
397 exit(-1);
398 }
399
400 status = -1;
401 if (wait_and_timeout(pid, 5, &status,
402 "test_non_blocking_reader: non_blocking_open_reader") < 0) {
403 (void)unlink("testfifo");
404 exit(-1);
405 }
406
407 if (WEXITSTATUS(status) != 0) {
408 (void)unlink("testfifo");
409 errno = WEXITSTATUS(status);
410 err(-1, "test_non_blocking_reader: "
411 "non_blocking_open_reader: open: testfifo");
412 }
413
414 if (unlink("testfifo") < 0)
415 err(-1, "test_non_blocking_reader: unlink: testfifo");
416}
417
418static void
419test_non_blocking_writer(void)
420{
421 int status;
422 pid_t pid;
423
424 if (mkfifo("testfifo", 0600) < 0)
425 err(-1, "test_non_blocking_writer: mkfifo: testfifo");
426
427 if (run_in_process(non_blocking_open_writer, &pid,
428 "test_non_blocking_writer: non_blocking_open_writer") < 0) {
429 (void)unlink("testfifo");
430 exit(-1);
431 }
432
433 status = -1;
434 if (wait_and_timeout(pid, 5, &status,
435 "test_non_blocking_writer: non_blocking_open_writer") < 0) {
436 (void)unlink("testfifo");
437 exit(-1);
438 }
439
440 if (WEXITSTATUS(status) != ENXIO) {
441 (void)unlink("testfifo");
442
443 errno = WEXITSTATUS(status);
444 if (errno == 0)
445 errx(-1, "test_non_blocking_writer: "
446 "non_blocking_open_writer: open succeeded");
447 err(-1, "test_non_blocking_writer: "
448 "non_blocking_open_writer: open: testfifo");
449 }
450
451 if (unlink("testfifo") < 0)
452 err(-1, "test_non_blocking_writer: unlink: testfifo");
453}
454
455int
456main(void)
457{
458
459 if (geteuid() != 0)
460 errx(-1, "must be run as root");
461
462 strcpy(temp_dir, "fifo_open.XXXXXXXXXXX");
463 if (mkdtemp(temp_dir) == NULL)
464 err(-1, "mkdtemp");
465 if (chdir(temp_dir) < 0)
466 err(-1, "chdir: %s", temp_dir);
467 atexit(atexit_temp_dir);
468
469 test_non_blocking_reader();
470 test_non_blocking_writer();
471
472 test_blocking_reader();
473 test_blocking_writer();
474
475 return (0);
476}
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