1 /* 2 * Copyright (c) 2015 Cedric Hnyda <chnyda (at) suse.com> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 /* 20 * Description: 21 * Write the current process in argv[1] 22 */ 23 24 #include <stdio.h> 25 #include <sys/time.h> 26 #include <sys/types.h> 27 #include <unistd.h> 28 #include <stdlib.h> 29 30 int main(int argc, char **argv) 31 { 32 FILE *f; 33 34 if (argc != 2) { 35 fprintf(stderr, "Usage: %s /cgroup/.../tasks\n", argv[0]); 36 return 1; 37 } 38 39 f = fopen(argv[1], "a"); 40 if (!f) { 41 perror("fopen failed"); 42 return 1; 43 } 44 45 fprintf(f, "%i\n", getpid()); 46 fclose(f); 47 struct itimerval it = {.it_value = {.tv_sec = 0, .tv_usec = 10000}}; 48 49 setitimer(ITIMER_VIRTUAL, &it, NULL); 50 for (;;); 51 return 0; 52 } 53