1 /*
2  * Copyright (c) 2008 Bret S. Lambert <blambert@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "local.h"
18 
19 void
20 fgets_thread(void *v)
21 {
22 	char buf[sizeof(TEXT_N) + 1];
23 	FILE *file = v;
24 	int i;
25 
26 	for (i = 0; i < 4096; i++) {
27 		if (fgets(buf, sizeof(buf), file) == NULL) {
28 
29 			if (feof(file))
30 				break;
31 
32 			printf("OMG!!!\n");
33 			fflush(stdout);
34 			break;
35 		}
36 		if (strncmp(buf, TEXT, sizeof(TEXT)))
37 			err(1, "Read not atomic!!!");
38 	}
39 }
40 
41 int
42 main(void)
43 {
44 	char sfn[24];
45 	FILE *sfp;
46 	int fd, i;
47 
48 	strlcpy(sfn, "/tmp/barnacles.XXXXXXXX", sizeof(sfn));
49 	if ((fd = mkstemp(sfn)) == -1 ||
50 	    (sfp = fdopen(fd, "w+")) == NULL) {
51 		int saved_errno = errno;
52 		if (fd != -1) {
53 			unlink(sfn);
54 			close(fd);
55 		}
56 		errc(1, saved_errno, "could not open temporary file");
57 	}
58 
59 	for (i = 0; i < 4096 * THREAD_COUNT; i++)
60 		if (fwrite(TEXT_N, sizeof(char), strlen(TEXT_N), sfp) == 0)
61 			err(1, "Could not populate test file");
62 
63 	run_threads(fgets_thread, sfp);
64 
65 	unlink(sfn);
66 	close(fd);
67 
68 	exit(0);
69 }
70