1/*
 2 * Copyright (c) 2024 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 userspace program is not kernel thread. */
17#undef NDEBUG
18#include <assert.h>
19#include <fcntl.h>
20#include <string.h>
21#include <unistd.h>
22
23int main(void)
24{
25	int fd = open("/proc/self/status", O_RDONLY);
26	assert(fd >= 0);
27
28	char buf[4096];
29	ssize_t rv = read(fd, buf, sizeof(buf));
30	assert(0 <= rv && rv < sizeof(buf));
31	buf[rv] = '\0';
32
33	/* This test is very much not kernel thread. */
34	assert(strstr(buf, "Kthread:\t0\n"));
35
36	return 0;
37}