[129] in The Cryptographic File System users list
Signal handling problem with Linux
daemon@ATHENA.MIT.EDU (Alexandre Stervinou)
Sat Apr 24 10:15:12 1999
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Message-ID: <3721D1AE.5C4E@info.enserb.u-bordeaux.fr>
Date: Sat, 24 Apr 1999 16:14:06 +0200
From: Alexandre Stervinou <stervino@info.enserb.u-bordeaux.fr>
Organization: ENSERB, Bordeaux, France
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Subject: Signal handling problem with Linux
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OS version : Linux 2.0.36
CFS version : 1.4.0 Beta 2
Bonjour,
I'd like to apologize if it's already known, but I found a problem
when I started playing with CFS a few days ago : cmkdir froze strangely
after having entered the secret key. A strace gave me the origin of the
problem, which concerns in fact the signal handling code in file
truerand.c . I think the context is not restored properly with setjmp()
and longjmp(), whereas the use of sigsetjmp() and siglongjmp() will also
restore blocked signals. Here's a little patch :
------------Patch begins-----------------
--- truerand.c Sun Dec 7 06:16:36 1997
+++ truerand.c Mon Apr 19 01:42:39 1999
@@ -110,7 +110,7 @@
interrupt()
{
if (count)
- longjmp(env, 1);
+ siglongjmp(env, 1);
(void) signal(SIGALRM, interrupt);
tick();
}
@@ -118,7 +118,7 @@
static unsigned long
roulette()
{
- if (setjmp(env))
+ if (sigsetjmp(env,1))
return count;
(void) signal(SIGALRM, interrupt);
count = 0;
------------Patch ends--------------------
--
Alexandre Stervinou
e-mail : stervino@info.enserb.u-bordeaux.fr
PGP key : available at
http://www.enserb.u-bordeaux.fr/~stervino/pgp.html
