Date: Tue, 11 Jul 2000 23:41:08 -0700 (PDT) From: marka@nominum.com To: freebsd-gnats-submit@FreeBSD.org Subject: kern/19863: Non-blocking IO not supported on /dev/random Message-ID: <20000712064108.BE05037BA01@hub.freebsd.org>
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>Number: 19863
>Category: kern
>Synopsis: Non-blocking IO not supported on /dev/random
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jul 11 23:50:03 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Mark Andrews
>Release: 4.0-stable
>Organization:
Nominum
>Environment:
FreeBSD drugs.dv.isc.org 4.0-STABLE FreeBSD 4.0-STABLE #1: Sat Jul 1 00:10:47 EST 2000 root@drugs.dv.isc.org:/usr/src/sys/compile/DRUGS i386
>Description:
It is not possible to set /dev/random into non-blocking mode using
fcntl. This make it impossible to use /dev/random in a application
that requires IO not to block.
>How-To-Repeat:
#include <fcntl.h>
#include <stdio.h>
int
main(int argc, char **argv) {
int fd;
int flags;
if ((fd = open("/dev/random", O_RDONLY, 0)) == -1) {
perror("open");
exit(1);
}
if ((flags = fcntl(fd, F_GETFL, 0)) == -1) {
perror("fcntl: F_GETFL");
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) == -1) {
perror("fcntl: F_SETFL");
exit(1);
}
close(fd);
exit(0);
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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