recvfrom and timeout signal

[Piotr Stępień]

Hi All,

I try to implement timeout for recvfrom:

	struct	sigaction action;
	action.sa_handler = alarm_signal;
	action.sa_flags = 0;
	sigemptyset(&(action.sa_mask)); 	/* ignore all known signals */
	sigaction(SIGALRM,&action,NULL);  	/* ensures that SA_RESTART is NOT set */

	alarm(TIMEOUT);
	int st=recvfrom(sockfd,buff,sizeof(buff),0,(sockaddr*)&srv_addr,&sz);
	if(st == -1){
		if(errno==EINTR){
			/* timeout */
		}else{
			alarm(0); /* reset alarm */
		}
	}

but the process is never woken by SIGALRM when no packet is received.
The recvfrom waits forever.

Has anybody an idea what can be wrong ?

--
Piotr Stepien


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