tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}