int main(int argc, char ** argv, char ** envp) {
while(1) {
fprintf(stderr, "Sleep...\n");
slepp(1);
}
return 0;
}
int main(int argc, char ** argv, char ** envp) {
int i, j;
char buf[16];
char * args[3];
struct sigaction action;
action.sa_flags = SA_SIGINFO;
action.sa_sigaction = sig_handler;
sigemptyset(&action.sa_mask);
sigaction(SIGCHLD, &action, NULL);
sigaction(SIGTERM, &action, NULL);
srand(time(NULL));
fprintf(stderr, "hello, pid=%d, argc=%d, argv0=[%s], argv1=[%s]\n", getpid(), argc, argv[0], argv[1]);
while(1) {
slepp(1);
switch(rand() & 0xf) {
case 0: // Fork...
if (fork() == 0) {
srand(getpid());
fprintf(stderr, "fork, pid=%d\n", getpid());
}
break;
case 1: // Exit...
fprintf(stderr, "exit, pid=%d\n", getpid());
exit(0);
case 2:
case 3: // Exec...
j = 0;
if (argc > 1) sscanf(argv[1], "%d", &j);
sprintf(buf, "%d", ++j);
args[0] = argv[0];
args[1] = buf;
args[2] = NULL;
fprintf(stderr, "exec, argv0=[%s], argv1=[%s]\n", argv[0], buf);
execve(argv[0], args, envp);
break;
default: // Do nothing by default...
fprintf(stderr, "sleep, zzzz...\n");
slepp(2 + (rand() % 5));
}
}
return 0;
}
int main()
{
int server_sockfd, client_sockfd;
int server_len, client_len;
struct sockaddr_in server_address;
struct sockaddr_in client_address;
server_sockfd = socket(AF_INET,SOCK_STREAM,0);
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = htonl(INADDR_ANY);
server_address.sin_port = htons(9734);
server_len = sizeof(server_address);
bind(server_sockfd, (struct sockaddr *)&server_address, server_len);
listen(server_sockfd, 5);
signal(SIGCHLD,SIG_INT);
while(1)
{
char ch;
printf("server waititng \n");
client_len = sizeof(client_address);
client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address,&client_len);
if (fork() == 0) {
read(client_sockfd, &ch, 1);
slepp(5);
ch++;
write(client_sockfd, &ch, 1);
close(client_sockfd);
exit(EXIT_SUCCESS);
}
else {
close(client_sockfd);
}
}
}
