Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751459AbVJLNJL (ORCPT ); Wed, 12 Oct 2005 09:09:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751449AbVJLNJK (ORCPT ); Wed, 12 Oct 2005 09:09:10 -0400 Received: from spirit.analogic.com ([204.178.40.4]:26122 "EHLO spirit.analogic.com") by vger.kernel.org with ESMTP id S1751463AbVJLNJJ convert rfc822-to-8bit (ORCPT ); Wed, 12 Oct 2005 09:09:09 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 In-Reply-To: <81b0412b0510120548k3464d355ne75cce4e5edcce1a@mail.gmail.com> References: <434CC144.6000504@boi.at> <81b0412b0510120548k3464d355ne75cce4e5edcce1a@mail.gmail.com> X-OriginalArrivalTime: 12 Oct 2005 13:09:08.0622 (UTC) FILETIME=[216DDAE0:01C5CF2E] Content-class: urn:content-classes:message Subject: Re: blocking file lock functions (lockf,flock,fcntl) do not return after timer signal Date: Wed, 12 Oct 2005 09:09:02 -0400 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: blocking file lock functions (lockf,flock,fcntl) do not return after timer signal Thread-Index: AcXPLiF1Cg9eMHm8R4OrRFhHPLFaxw== From: "linux-os \(Dick Johnson\)" To: "Alex Riesen" Cc: , Reply-To: "linux-os \(Dick Johnson\)" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2371 Lines: 73 On Wed, 12 Oct 2005, Alex Riesen wrote: > On 10/12/05, "Dieter M?ller (BOI GmbH)" wrote: >> bug description: >> >> flock, lockf, fcntl do not return even after the signal SIGALRM has >> been raised and the signal handler function has been executed >> the functions should return with a return value EWOULDBLOCK as described >> in the man pages > > To confirm: > > #include > #include > #include > #include > #include > > void alrm(int sig) > { > write(2, "timeout\n", 8); > } > > int main(int argc, char* argv[]) > { > struct itimerval tv = { > .it_interval = {.tv_sec = 10, .tv_usec = 0}, > .it_value = {.tv_sec = 10, .tv_usec = 0}, > }; > struct itimerval otv; > > signal(SIGALRM, alrm); > setitimer(ITIMER_REAL, &tv, &otv); > int fd = open(argv[1], O_RDWR); > if ( fd < 0 ) > { > perror(argv[1]); > return 1; > } > printf("locking...\n"); > if ( flock(fd, LOCK_EX) < 0 ) > { > perror("flock"); > return 1; > } > printf("sleeping...\n"); > int ch; > read(0, &ch, 1); > close(fd); > return 0; > } > - Does your 'signal()' impliment POSIX or BSD signals? You don't know. It's whatever the 'C' runtime library got built for. You need to use sigaction() so you can set the flags to give you your intended action. Cheers, Dick Johnson Penguin : Linux version 2.6.13.4 on an i686 machine (5589.48 BogoMips). Warning : 98.36% of all statistics are fiction. **************************************************************** The information transmitted in this message is confidential and may be privileged. Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them. Thank you. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/