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1/*2 * Copyright (c) 2024 Alexey Dobriyan <adobriyan@gmail.com>3 *4 * Permission to use, copy, modify, and distribute this software for any5 * purpose with or without fee is hereby granted, provided that the above6 * copyright notice and this permission notice appear in all copies.7 *8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.15 */16/* Test that userspace program is not kernel thread. */17#undef NDEBUG18#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}38