Date: Mon, 6 Sep 1999 09:47:32 +0400 (MSD) From: Alex Povolotsky <tarkhil@asteroid.svib.ru> To: stable@freebsd.org Cc: hackers@freebsd.org Subject: Problems with FIFO open in non-blocking mode? Message-ID: <199909060547.JAA29146@shuttle.svib.ru>
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Hello!
The following program
#include <stdio.h>
#include <fcntl.h>
main() {
int control;
if ((control = open("STATUS",O_WRONLY|O_NONBLOCK))<0) {
perror("Could not open STATUS ");
exit(1);
}
printf("STATUS ready\n");
close(control);
return(0);
}
fails to run (STATUS is pre-created FIFO file) with error "Device not
configured", which seems kinda odd for me.
However, when FIFO is opened with O_RDWR and O_NONBLOCK, every attempt
to select(2) its handler for writing doesn't wait until someone opens
FIFO for reading, but instead FIFO is ready to write at every select.
Is it a bug or a feature?
--
Alexander B. Povolotsky [ICQ 18277558]
[2:5020/145] [http://freebsd.svib.ru] [tarkhil@asteroid.svib.ru]
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