Bug#45104: marked as done (setsid() breakage)
Your message dated Sat, 2 Oct 1999 17:15:15 -0400
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and subject line setsid() breakage
has caused the attached Bug report to be marked as done.
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Date: Wed, 15 Sep 1999 01:44:20 +0200
From: Marcus Brinkmann <Marcus.Brinkmann@ruhr-uni-bochum.de>
To: submit@bugs.debian.org
Subject: setsid() breakage
Message-ID: <19990915014420.A321@ulysses.dhis.org>
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Organization: Marcus Brinkmann's Home
Package: libc0.2
Version: N/A
Hello,
the setsid() function does not behave correctly on the Hurd.
First, it returns an unconditional 0 at succesful operation, instead the
process group id.
Secondly, and this is currently the main problem with screen, it does
not disconnect properly from its controlling terminal. At least this
is how I interpret the behaviour. First, screen: screen calls setsid(), and
then does a read() on /dev/console while ignoring SIGTTIN. This leads to
a failure EIO (which means that it still has /dev/console as ctty).
Secondly, I tried to isolate a test case, which shows the errornous
behaviour.
The below program under Linux:
ulysses:/tmp# ./setsid
setsid: 360, Success
hello
read: 6, Success
world
ulysses:/tmp# world
bash: world: command not found
Under the Hurd:
hurd:/tmp# ./setsid
setsid: 0, (os/kern) successful
hello
world
hurd:/tests/setsid# hello
bash: hello: command not found
hurd:/tests/setsid# world
bash: world: command not found
Note that read() does not return.
Obviously, the keyboard input never reaches the child process.
===============================================================
#include <errno.h>
#include <sys/types.h>
#include <fcntl.h>
main()
{
int child, fd, length;
pid_t p;
char b[16];
fd=open("/dev/console",O_RDONLY,0);
if (!fd)
printf("open: %s\n", strerror(errno));
child=fork();
if(!child) {
p = setsid();
printf("%i, %s\n", p, strerror(errno));
length = read(fd, 16, b);
printf("read: %i, %s\n", length, strerror(errno));
}
sleep(5);
}
==============================================================
Thanks,
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org Check Key server
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From: Roland McGrath <roland@gnu.org>
To: Mark Kettenis <kettenis@wins.uva.nl>
Cc: Marcus.Brinkmann@ruhr-uni-bochum.de, bug-hurd@gnu.org,
45104-done@bugs.debian.org
Subject: Re: setsid() breakage
In-Reply-To: Mark Kettenis's message of Sat, 2 October 1999 21:03:35 +0200 <[🔎] 199910021903.VAA00105@delius.kettenis.nl>
X-Zippy-Says: HOORAY, Ronald!! Now YOU can marry LINDA RONSTADT too!
> Date: Fri, 1 Oct 1999 16:04:15 -0400
> From: Roland McGrath <roland@gnu.org>
>
> I've checked in a different fix for this to libc 2.1, that I think is
> correct and avoids some more busy-work. But I have not tested this code at
> all beyond compiling it, so please let me know how it is. I think the
> comments in the new code explain the rationale.
>
> Looks good and seems to be working fine.
Great! Thanks for the feedback.
I am declaring the setsid bug report closed.
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