函数sigsuspend

int sigqueue(pid_t pid, int signo, const union sigval value);

 1 #include <stdlib.h>
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <signal.h>
 5 #include <unistd.h>
 6  
 7 int main(int argc, char *argv[])
 8 {
 9     if(argc != 2) 
10     {
11         fprintf(stderr, "Usage %s pid\n", argv[0]);
12         exit(0);
13     }
14     pid_t pid = atoi(argv[1]);
15     union sigval v;
16     v.sival_int = 100;
17     sigqueue(pid, SIGINT, v);
18     sleep(3);
19     return 0;  
20 }

 1 #include <string.h>
 2 #include <signal.h>
 3 #include <unistd.h>
 4 #include <stdlib.h>
 5 #include <stdio.h>
 6  
 7 void handler(int sig, siginfo_t *info, void *ctx)
 8 {
 9     printf("recv a sig = %d data = %d data = %d\n", sig, info->si_value.sival_int, info->si_int);
10 }
11 
12 int main(int argc, char *argv[])
13 {
14     printf("I‘m %d\n", getpid());
15     struct sigaction act;
16     act.sa_sigaction = handler;
17     sigemptyset(&act.sa_mask);
18     act.sa_flags = SA_SIGINFO;
19     
20     if(sigaction(SIGINT, &act, NULL) < 0) 
21     {
22         perror("sigaction error");
23         exit(0);
24     }
25     for(; ;)
26       pause();
27     return 0;
28 }

 1 #include <stdlib.h>
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <signal.h>
 5 #include <unistd.h>
 6  
 7 int main(int argc, char *argv[])
 8 {
 9     if(argc != 2) 
10     {
11         fprintf(stderr, "Usage %s pid\n", argv[0]);
12         exit(0);
13     }
14     pid_t pid = atoi(argv[1]);
15     union sigval v;
16     v.sival_int = 100;
17     sigqueue(pid, SIGINT, v);
18     sigqueue(pid, SIGINT, v);
19     sigqueue(pid, SIGINT, v);
20     sigqueue(pid, SIGRTMIN, v);
21     sigqueue(pid, SIGRTMIN, v);
22     sigqueue(pid, SIGRTMIN, v);
23     sleep(3);
24     kill(pid, SIGUSR1);
25     return 0;    
26 }

 1 #include <string.h>
 2 #include <signal.h>
 3 #include <unistd.h>
 4 #include <stdlib.h>
 5 #include <stdio.h>
 6  
 7 void handler(int sig)
 8 {
 9     if(sig == SIGINT || sig == SIGRTMIN) 
10     printf("recv a sig = %d\n", sig);
11     else if(sig == SIGUSR1)
12     {
13         sigset_t s;
14         sigemptyset(&s);
15         sigaddset(&s, SIGINT);
16         sigaddset(&s, SIGRTMIN);
17         sigprocmask(SIG_UNBLOCK, &s, NULL);        
18     }
19 }
20  
21 int main(int argc, char *argv[])
22 {
23     printf("I‘m %d\n", getpid());
24     struct sigaction act;
25     act.sa_sigaction = handler;
26     sigemptyset(&act.sa_mask);
27     act.sa_flags = 0;
28     
29     sigset_t s;
30     sigemptyset(&s);
31     sigaddset(&s, SIGINT);
32     sigaddset(&s, SIGRTMIN);
33     sigprocmask(SIG_BLOCK, &s, NULL);
34     if(sigaction(SIGINT, &act, NULL) < 0) 
35     {
36         perror("sigaction error");
37         exit(0);
38     }
39     if(sigaction(SIGRTMIN, &act, NULL) < 0) 
40     {
41         perror("sigaction error");
42         exit(0);
43     }
44     if(sigaction(SIGUSR1, &act, NULL) < 0) 
45     {
46         perror("sigaction error");
47         exit(0);
48     }
49     for(; ;)
50       pause();
51     return 0;
52 }