Messages in this thread | | | Date | Tue, 25 Aug 1998 19:45:52 +0200 (MEST) | From | (Gert Doering) | Subject | Re: Out of ptys |
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Richard Johnson wrote:
>On 25 Aug 1998, Matthias Urlichs wrote: >> > > > open("/dev/ptyp2", O_RDWR) = 3 >> > > > ioctl(1, TCGETS, 0xbffff1dc) = -1 EINVAL (Invalid argument) >> > > > ioctl(2, TCGETS, 0xbffff1d0) = -1 EINVAL (Invalid argument) [..]
>Don't you love the way these replies start! Always with "wrong" or "no".
Must be something with the way you write e-mails. Only rarely happens for me - see below for a possible reason.
>The "program" to which you refer is telnetd. The ioctls failed because >there were no open fds 1 or 2, yet an open returned 3. Telnetd failed >because this was unexpected behavior.
My man page for ioctl() says:
ioctl( int d, int request, ... )
[The "third" argument is traditionally char * argp, and will be so named for this discussion]
...
ERRORS
EBADF d not a valid file descriptor.
ENOTTY d is not associated with a character special device.
ENOTTY The specified request does not apply to the kind of object that the descriptor d references.
EINVAL request or argp is not valid
So, obviously, "1" and "2" *are* open and valid file descriptors, and the behaviour seen (open() returning "3") is thus perfectly ok.
gert -- email: gert@greenie.muc.de fax: +49-89-3244814 http://www.leo.org/~doering
Murphy's Fifth Law: If anything just cannot go wrong, it will anyway.
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