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 <signal.h> 29 #include <stdlib.h> 30 #include <string.h> 31 32 static void sig_handler(int signo) 33 { 34 _exit(0); 35 } 36 37 int main(int argc, char **argv) 38 { 39 FILE *f; 40 struct sigaction sa; 41 42 if (argc != 2) { 43 fprintf(stderr, "Usage: %s /cgroup/.../tasks\n", argv[0]); 44 return 1; 45 } 46 47 f = fopen(argv[1], "a"); 48 if (!f) { 49 perror("fopen failed"); 50 return 1; 51 } 52 53 fprintf(f, "%i\n", getpid()); 54 fclose(f); 55 56 memset(&sa, 0, sizeof(sa)); 57 sigemptyset(&sa.sa_mask); 58 sa.sa_handler = sig_handler; 59 60 if (sigaction(SIGVTALRM, &sa, NULL)) { 61 perror("sigaction failed"); 62 return 1; 63 } 64 65 struct itimerval it = {.it_value = {.tv_sec = 0, .tv_usec = 10000}}; 66 67 setitimer(ITIMER_VIRTUAL, &it, NULL); 68 for (;;); 69 return 0; 70 } 71
