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1 #include <stdlib.h>
2 #include <string.h>
3 #include <unistd.h>
4 #include <errno.h>
5 #include <stdio.h>
6 #include <signal.h>
7 #include <pthread.h>
8 
9 static void sig_usr1(int);
10 
11 static pthread_t main_thread;
12 
13 void *
child_main(void * no_args)14 child_main(void *no_args)
15 {
16 //  int i;
17 
18 // Only do it once, to shorten test --njn
19 //  for (i = 0; i < 5; ++i)
20 //    {
21       sleep (1);
22       fprintf (stdout, "thread CHILD sending SIGUSR1 to thread MAIN\n");
23       if (pthread_kill (main_thread, SIGUSR1) != 0)
24         fprintf (stderr, "error doing pthread_kill\n");
25 //    }
26 
27   return no_args;
28 }
29 
30 int
main(void)31 main(void)
32 {
33   struct sigaction sigact;
34   sigset_t newmask, oldmask;
35   pthread_t child;
36 
37   memset(&newmask, 0, sizeof newmask);
38   sigemptyset (&newmask);
39   sigaddset (&newmask, SIGUSR1);
40 
41   if (pthread_sigmask (SIG_BLOCK, &newmask, &oldmask) != 0)
42     fprintf (stderr, "SIG_BLOCK error");
43 
44   memset (&sigact, 0, sizeof sigact);
45   sigact.sa_handler = sig_usr1;
46   if (sigaction(SIGUSR1, &sigact, NULL) != 0)
47     fprintf (stderr, "signal(SIGINT) error");
48 
49   main_thread = pthread_self ();
50   if (pthread_create (&child, NULL, child_main, NULL) != 0)
51     fprintf (stderr, "error creating thread");
52 
53   pthread_join (child, NULL);
54 
55   exit(0);
56 }
57 
58 static void
sig_usr1(int signo)59 sig_usr1 (int signo)
60 {
61   fprintf (stderr, "SHOULD NOT BE HERE (SIGUSR1)!!!!\n");
62   return;
63 }
64 
65 
66