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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