signals/sig_sender.c

+/* sig_sender.c
+
+   Usage: sig_sender PID num-sigs sig [sig2]
+
+   Send signals to sig_receiver.c.
+
+   Sends 'num-sigs' signals of type 'sig' to the process with the specified PID.
+   If a fourth command-line argument is supplied, send one instance of that
+   signal, after sending the previous signals.
+*/
 #include <signal.h>
 #include "tlpi_hdr.h"
 
 int
 main(int argc, char *argv[])
 {
     int numSigs, sig, j;
     pid_t pid;
 
     if (argc < 4 || strcmp(argv[1], "--help") == 0)
         usageErr("%s pid num-sigs sig-num [sig-num-2]\n", argv[0]);
 
     pid = getLong(argv[1], 0, "PID");
     numSigs = getInt(argv[2], GN_GT_0, "num-sigs");
     sig = getInt(argv[3], 0, "sig-num");
 
     /* Send signals to receiver */
 
     printf("%s: sending signal %d to process %ld %d times\n",
             argv[0], sig, (long) pid, numSigs);
 
     for (j = 0; j < numSigs; j++)
         if (kill(pid, sig) == -1)
             errExit("kill");
 
     /* If a fourth command-line argument was specified, send that signal */
 
     if (argc > 4)
         if (kill(pid, getInt(argv[4], 0, "sig-num-2")) == -1)
             errExit("kill");
 
     printf("%s: exiting\n", argv[0]);
     exit(EXIT_SUCCESS);
 }