1*e7679a5cSAlexey Dobriyan /*
2*e7679a5cSAlexey Dobriyan * Copyright (c) 2024 Alexey Dobriyan <adobriyan@gmail.com>
3*e7679a5cSAlexey Dobriyan *
4*e7679a5cSAlexey Dobriyan * Permission to use, copy, modify, and distribute this software for any
5*e7679a5cSAlexey Dobriyan * purpose with or without fee is hereby granted, provided that the above
6*e7679a5cSAlexey Dobriyan * copyright notice and this permission notice appear in all copies.
7*e7679a5cSAlexey Dobriyan *
8*e7679a5cSAlexey Dobriyan * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9*e7679a5cSAlexey Dobriyan * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10*e7679a5cSAlexey Dobriyan * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11*e7679a5cSAlexey Dobriyan * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12*e7679a5cSAlexey Dobriyan * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13*e7679a5cSAlexey Dobriyan * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14*e7679a5cSAlexey Dobriyan * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15*e7679a5cSAlexey Dobriyan */
16*e7679a5cSAlexey Dobriyan /* Test that userspace program is not kernel thread. */
17*e7679a5cSAlexey Dobriyan #undef NDEBUG
18*e7679a5cSAlexey Dobriyan #include <assert.h>
19*e7679a5cSAlexey Dobriyan #include <fcntl.h>
20*e7679a5cSAlexey Dobriyan #include <string.h>
21*e7679a5cSAlexey Dobriyan #include <unistd.h>
22*e7679a5cSAlexey Dobriyan
main(void)23*e7679a5cSAlexey Dobriyan int main(void)
24*e7679a5cSAlexey Dobriyan {
25*e7679a5cSAlexey Dobriyan int fd = open("/proc/self/status", O_RDONLY);
26*e7679a5cSAlexey Dobriyan assert(fd >= 0);
27*e7679a5cSAlexey Dobriyan
28*e7679a5cSAlexey Dobriyan char buf[4096];
29*e7679a5cSAlexey Dobriyan ssize_t rv = read(fd, buf, sizeof(buf));
30*e7679a5cSAlexey Dobriyan assert(0 <= rv && rv < sizeof(buf));
31*e7679a5cSAlexey Dobriyan buf[rv] = '\0';
32*e7679a5cSAlexey Dobriyan
33*e7679a5cSAlexey Dobriyan /* This test is very much not kernel thread. */
34*e7679a5cSAlexey Dobriyan assert(strstr(buf, "Kthread:\t0\n"));
35*e7679a5cSAlexey Dobriyan
36*e7679a5cSAlexey Dobriyan return 0;
37*e7679a5cSAlexey Dobriyan }
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