1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /******************************************************************************
3  *
4  * Copyright FUJITSU LIMITED 2010
5  * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
6  *
7  * DESCRIPTION
8  *      Internally, Futex has two handling mode, anon and file. The private file
9  *      mapping is special. At first it behave as file, but after write anything
10  *      it behave as anon. This test is intent to test such case.
11  *
12  * AUTHOR
13  *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
14  *
15  * HISTORY
16  *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
17  *
18  *****************************************************************************/
19 
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <syscall.h>
23 #include <unistd.h>
24 #include <errno.h>
25 #include <linux/futex.h>
26 #include <pthread.h>
27 #include <libgen.h>
28 #include <signal.h>
29 
30 #include "logging.h"
31 #include "futextest.h"
32 
33 #define TEST_NAME "futex-wait-private-mapped-file"
34 #define PAGE_SZ 4096
35 
36 char pad[PAGE_SZ] = {1};
37 futex_t val = 1;
38 char pad2[PAGE_SZ] = {1};
39 
40 #define WAKE_WAIT_US 3000000
41 struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
42 
43 void usage(char *prog)
44 {
45 	printf("Usage: %s\n", prog);
46 	printf("  -c	Use color\n");
47 	printf("  -h	Display this help message\n");
48 	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
49 	       VQUIET, VCRITICAL, VINFO);
50 }
51 
52 void *thr_futex_wait(void *arg)
53 {
54 	int ret;
55 
56 	info("futex wait\n");
57 	ret = futex_wait(&val, 1, &wait_timeout, 0);
58 	if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT) {
59 		error("futex error.\n", errno);
60 		print_result(TEST_NAME, RET_ERROR);
61 		exit(RET_ERROR);
62 	}
63 
64 	if (ret && errno == ETIMEDOUT)
65 		fail("waiter timedout\n");
66 
67 	info("futex_wait: ret = %d, errno = %d\n", ret, errno);
68 
69 	return NULL;
70 }
71 
72 int main(int argc, char **argv)
73 {
74 	pthread_t thr;
75 	int ret = RET_PASS;
76 	int res;
77 	int c;
78 
79 	while ((c = getopt(argc, argv, "chv:")) != -1) {
80 		switch (c) {
81 		case 'c':
82 			log_color(1);
83 			break;
84 		case 'h':
85 			usage(basename(argv[0]));
86 			exit(0);
87 		case 'v':
88 			log_verbosity(atoi(optarg));
89 			break;
90 		default:
91 			usage(basename(argv[0]));
92 			exit(1);
93 		}
94 	}
95 
96 	ksft_print_header();
97 	ksft_set_plan(1);
98 	ksft_print_msg(
99 		"%s: Test the futex value of private file mappings in FUTEX_WAIT\n",
100 		basename(argv[0]));
101 
102 	ret = pthread_create(&thr, NULL, thr_futex_wait, NULL);
103 	if (ret < 0) {
104 		fprintf(stderr, "pthread_create error\n");
105 		ret = RET_ERROR;
106 		goto out;
107 	}
108 
109 	info("wait a while\n");
110 	usleep(WAKE_WAIT_US);
111 	val = 2;
112 	res = futex_wake(&val, 1, 0);
113 	info("futex_wake %d\n", res);
114 	if (res != 1) {
115 		fail("FUTEX_WAKE didn't find the waiting thread.\n");
116 		ret = RET_FAIL;
117 	}
118 
119 	info("join\n");
120 	pthread_join(thr, NULL);
121 
122  out:
123 	print_result(TEST_NAME, ret);
124 	return ret;
125 }
126