johnr@uunet.uu.net (John Reed) (12/22/88)
I'm having a couple of problems with xterm under Sun4OS. We have a
Sun4/280 that is being used as our client host. We are using Version 11,
Release 2 of X We currently have only 1 useable X tube on our E-net.
1. xterm receives a hangup signal when there is no local entry in
the password file
Our Sun 4 uses a yellow pages password file, and the local password
file in "/etc" does not contain any "user" entries.
From any terminal connected to the system, type in "xterm &".
Assuming that the DISPLAY environment variable is set up correctly.
The program receives a hangup signal. Nothing happens on the X tube
This can be remedied by making a local entry for your user in the
"/etc" password file.
The following adb session shows a stack trace after the signal was
received:
% adb /home/X/bin/xterm
:r
SIGHUP 1: hangup
stopped at _close+8: bgeu _close + 0x18
$c
_close() + 8
_clntudp_create(0x5f050,0x5efe4,0x5dc00,0x0,0x65636800,0x5f068) + 65c
_yp_unbind(0x5ef60,0xf7ffe954,0xf7ffe964,0x0,0x65636800,0x5efd8) + 60
_yp_get_default_domain(0x5ef60,0xf7ffea6c,0x2,0x5ef60,0x1,0x5efd8) + 128
__yp_dobind(0x5ef60,0xf7ffea6c,0x5dc00,0xa,0x81010100,0xff00) + e4
_yp_match(0x5ef60,0x581ef,0xf7ffeaec,0x3,0xf7ffeae8,0xf7ffeae4) + 1bc
_getpwent(0x6d,0x5e490,0xa,0x0,0xf7ffeaec,0x68310) + 9b4
_getpwent(0xf7ffecc7,0xf7ffecc0,0x6d,0x0,0x68310,0x6834c) + 540
_getpwuid(0x6d,0x2,0x0,0x5de4d,0x68310,0xf7ffecc7) + 7c
_spawn(0x1,0x3,0x5,0xd8,0xd8,0xd) + 8c0
_main(0xffffffff,0x5fbf0,0xffffffff,0xffffffff,0x59bec,0xffffffff) + 868
$q
%
Again, this situation can be remedied by adding a local entry into
the password file.
We also have a Sun 3 (running Sun 3.4OS) and its password file is set up
identically. We can use this host as the X client machine and run
xterm with no problems whatsoever.
Have I found a bug in Sun's 4.0 OS ?? The problem seems to be with
getpwuid().
2. xterm will terminate with an error when invoked from uwm's "New window"
menu.
This is a strange one! The scenario is as follows:
I start up the uwm window manager on my X tube from our Sun 4 which
is running 4.0 OS. Now I choose the "New Window" menu item from
uwm's main menu.
The xterm window never shows up on the tube.
I have hacked on this for awhile, and discovered the problem area and
have also hacked in a fix.
The following code in function "spawn()" of main.c is the culprit:
signal(SIGALRM, hungtty);
alarm(1);
if (! setjmp(env)) {
tty = open ("/dev/tty", O_RDWR, 0);
alarm(0);
} else {
tty = -1;
errno = ENXIO;
}
signal(SIGALRM, SIG_DFL);
It turns out that the open call returns a -1, and sets errno to EIO.
I remedied the situation by adding this code just after the open call:
if (tty == -1 && errno == EIO)
errno = ENXIO;
Don't tell me, I know this is a terrible hack fix, but at least it
works. There may be some legitimate errors that are being missed
because of this hack, but I have yet to experience any trouble after
adding this fix.
Any further ideas, thoughts, flames ??
John Reed
{uunet,ucsd}!systech!johnr