Date: Thu, 14 Nov 2002 14:58:28 +0100 From: Boris Nikolaus <boris@cs.tu-berlin.de> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/45293: kevent denies to observe /dev/tty Message-ID: <20021114135828.GB13558@fiesta.cs.tu-berlin.de>
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>Number: 45293
>Category: kern
>Synopsis: kevent denies to observe /dev/tty
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 14 06:00:04 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Boris Nikolaus
>Release: FreeBSD 4.7-STABLE i386
>Organization:
>Environment:
System: FreeBSD XXXXXX 4.7-STABLE FreeBSD 4.7-STABLE #43: Tue Oct 22 20:25:44 CEST 2002 root@XXXXXX:/usr/src/sys/compile/BORIS i386
>Description:
kevent(2) denies to observe /dev/tty, it returns EPERM when trying to add
an EVFILT_READ event for it. (Just for info: Using STDIN_FILENO works fine.)
>How-To-Repeat:
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
int main() {
int qfd;
int ret;
int fd;
struct kevent kev[1];
qfd = kqueue();
fd = open("/dev/tty", O_RDWR);
if (fd < 0)
exit(1);
EV_SET(&kev[0], fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
ret = kevent(qfd, kev, 1, NULL, 0, NULL);
printf("kevent returned %d\n", ret);
if (ret < 0)
printf("errno = %d (%s)\n", errno, strerror(errno));
close(qfd);
return 0;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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