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 23 int 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