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Re: recvfrom and timeout signal
- From: Christopher Faylor <cgf at redhat dot com>
- To: cygwin at cygwin dot com
- Date: Tue, 19 Feb 2002 16:41:52 -0500
- Subject: Re: recvfrom and timeout signal
- References: <LPBBKFLLCCLABNJIKJOGKELLGOAA.pstepien@aspco.com.pl>
- Reply-to: cygwin at cygwin dot com
On Tue, Feb 19, 2002 at 10:28:02PM +0100, Piotr St?pie? wrote:
>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 ?
Nope. Send an actual small working test case and someone will probably
investigate it.
cgf
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