68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
|
/*
|
||
|
|
* Test name: test13b.c
|
||
|
|
*
|
||
|
|
* Objective: The purpose of this tests is to show how pselect()
|
||
|
|
* solves the situation shown in test13a.c
|
||
|
|
*
|
||
|
|
* Description: The program waits for SIGHUP or input in the terminal
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/select.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
int got_sighup = 0;
|
||
|
|
|
||
|
|
void catch_hup(int sig_num)
|
||
|
|
{
|
||
|
|
printf("Received a SIGHUP, set global vble \n");
|
||
|
|
got_sighup = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(void) {
|
||
|
|
int ret; /* return value */
|
||
|
|
fd_set read_fds;
|
||
|
|
sigset_t sigmask, orig_sigmask;
|
||
|
|
char data[1024];
|
||
|
|
|
||
|
|
/* Init read fd_set */
|
||
|
|
FD_ZERO(&read_fds);
|
||
|
|
FD_SET(0, &read_fds);
|
||
|
|
|
||
|
|
/* set the signal masks */
|
||
|
|
sigemptyset(&sigmask);
|
||
|
|
sigaddset(&sigmask, SIGHUP);
|
||
|
|
sigprocmask( SIG_BLOCK, &sigmask, &orig_sigmask);
|
||
|
|
|
||
|
|
/* set the HUP signal handler to 'catch_hup' */
|
||
|
|
signal(SIGHUP, catch_hup);
|
||
|
|
|
||
|
|
/* Get proc_id and print it */
|
||
|
|
printf("Send a signal from other terminal with: kill -1 %d\n", getpid());
|
||
|
|
printf("Going to sleep for 5 seconds, if the signal arrives meanwhile\n");
|
||
|
|
printf("the process will be blocked until there is input in the keyboard\n");
|
||
|
|
printf("if the signal arrives after the timeout and while in select, it will\n");
|
||
|
|
printf("behave as it should.\n");
|
||
|
|
printf("Sleeping for 5 secs\n");
|
||
|
|
sleep(5);
|
||
|
|
|
||
|
|
printf("Blocking now on select...\n");
|
||
|
|
#if 0
|
||
|
|
ret = pselect(1, &read_fds, NULL, NULL, NULL, &orig_sigmask);
|
||
|
|
#else
|
||
|
|
ret = -1;
|
||
|
|
#endif
|
||
|
|
if (got_sighup) {
|
||
|
|
printf("We have a sighup signal so exit the program\n");
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
gets(data);
|
||
|
|
printf("Got entry for terminal then, bye\n");
|
||
|
|
|
||
|
|
}
|