killall5.c (1559B)
1 /* 2 3 killall5 -- send a signal to all processes. 4 5 killall5 is the SystemV killall command. It sends a signal 6 to all processes except init(PID 1) and the processes in its 7 own session, so it won't kill the shell that is running the 8 script it was called from. Its primary (only) use is in the rc 9 scripts found in the /etc/init.d directory. 10 11 This program is free software; you can redistribute it and/or 12 modify it under the terms of the GNU General Public License 13 as published by the Free Software Foundation; either version 14 2 of the License, or (at your option) any later version. 15 16 */ 17 18 #include <dirent.h> 19 #include <signal.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <unistd.h> 23 #include <sys/types.h> 24 25 #define USAGE "Usage: killall5 SIGNAL\n" 26 #define NOPROC "No processes found - /proc not mounted?\n" 27 28 int main(int argc, char **argv) 29 { 30 struct dirent *dir; 31 DIR *dirstream; 32 register pid_t pid, sid, mypid, mysid; 33 int signal=-1; 34 unsigned int sig_sent=0; 35 36 if (argc == 2) { 37 if (argv[1][0] == '-') argv[1]++; 38 signal=atoi(argv[1]); 39 } 40 41 if ( (signal < 1) || ( signal > 31) ) { write(2,USAGE,sizeof USAGE - 1); return 1; } 42 43 44 kill(-1,SIGSTOP); 45 46 if ( (dirstream=opendir("/proc"))) { 47 48 mypid=getpid(); 49 mysid=getsid(0); 50 51 while ( (dir=readdir(dirstream))){ 52 pid=atoi(dir->d_name); 53 54 if (pid > 1 ){ 55 sig_sent=1; 56 sid=getsid(pid); 57 if ( (pid != mypid) && 58 ( sid !=mysid)) kill(pid,signal); 59 } 60 } 61 } 62 63 kill(-1,SIGCONT); 64 if (!sig_sent) { write(2,NOPROC, sizeof NOPROC -1); return 1; } 65 66 return 0; 67 } 68