1/*
 2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
 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// Test that /proc/thread-self gives correct TGID/PID.
17#undef NDEBUG
18#include <assert.h>
19#include <sched.h>
20#include <stdio.h>
21#include <unistd.h>
22#include <sys/mman.h>
23#include <sys/wait.h>
24
25#include "proc.h"
26
27int f(void *arg)
28{
29	char buf1[64], buf2[64];
30	pid_t pid, tid;
31	ssize_t rv;
32
33	pid = sys_getpid();
34	tid = sys_gettid();
35	snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid);
36
37	rv = readlink("/proc/thread-self", buf2, sizeof(buf2));
38	assert(rv == strlen(buf1));
39	buf2[rv] = '\0';
40	assert(streq(buf1, buf2));
41
42	if (arg)
43		exit(0);
44	return 0;
45}
46
47int main(void)
48{
49	const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
50	pid_t pid;
51	void *stack;
52
53	/* main thread */
54	f((void *)0);
55
56	stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
57	assert(stack != MAP_FAILED);
58	/* side thread */
59	pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1);
60	assert(pid > 0);
61	pause();
62
63	return 0;
64}

 1/*
 2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
 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// Test that /proc/thread-self gives correct TGID/PID.
17#undef NDEBUG
18#include <assert.h>
19#include <sched.h>
20#include <stdio.h>
21#include <unistd.h>
22#include <sys/mman.h>
23#include <sys/wait.h>
24
25#include "proc.h"
26
27int f(void *arg)
28{
29	char buf1[64], buf2[64];
30	pid_t pid, tid;
31	ssize_t rv;
32
33	pid = sys_getpid();
34	tid = sys_gettid();
35	snprintf(buf1, sizeof(buf1), "%u/task/%u", pid, tid);
36
37	rv = readlink("/proc/thread-self", buf2, sizeof(buf2));
38	assert(rv == strlen(buf1));
39	buf2[rv] = '\0';
40	assert(streq(buf1, buf2));
41
42	if (arg)
43		exit(0);
44	return 0;
45}
46
47int main(void)
48{
49	const int PAGE_SIZE = sysconf(_SC_PAGESIZE);
50	pid_t pid;
51	void *stack;
52
53	/* main thread */
54	f((void *)0);
55
56	stack = mmap(NULL, 2 * PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
57	assert(stack != MAP_FAILED);
58	/* side thread */
59	pid = clone(f, stack + PAGE_SIZE, CLONE_THREAD|CLONE_SIGHAND|CLONE_VM, (void *)1);
60	assert(pid > 0);
61	pause();
62
63	return 0;
64}