From: Philippe Troin <phil@fifi.org>
To: zsh-workers@sunsite.dk
Subject: Inconsistent signal handling?
Date: 25 Oct 2002 20:22:16 -0700 [thread overview]
Message-ID: <877kg5c2af.fsf@ceramic.fifi.org> (raw)
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In init.c, init_signals() says:
void
init_signals(void)
{
sigchld_mask = signal_mask(SIGCHLD);
intr();
#ifndef QDEBUG
signal_ignore(SIGQUIT);
#endif
install_handler(SIGHUP);
install_handler(SIGCHLD);
#ifdef SIGWINCH
install_handler(SIGWINCH);
#endif
if (interact) {
install_handler(SIGALRM);
[1] signal_ignore(SIGTERM);
}
if (jobbing) {
[2] long ttypgrp;
[2]
[2] while ((ttypgrp = gettygrp()) != -1 && ttypgrp != mypgrp)
[2] kill(0, SIGTTIN);
[2] if (ttypgrp == -1) {
[2] opts[MONITOR] = 0;
[2] } else {
[2] signal_ignore(SIGTTOU);
[2] signal_ignore(SIGTSTP);
[2] signal_ignore(SIGTTIN);
[2] attachtty(mypgrp);
[2] }
}
[3] if (islogin) {
[4] signal_setmask(signal_mask(0));
} else if (interact) {
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGQUIT);
signal_unblock(set);
}
}
My remarks:
[1] Why do we ignore SIGTERM on interactive sessions? That sounds
like a bad idea to me.
[2] See my previous mail <87bs5hc31h.fsf@ceramic.fifi.org>
[3] Why do we only clean-up the signal mask on login shells? It
should happen on interactive shells (there can be login
non-interactive shells, eg. for X11 startup).
[4] This is not enough to clean-up all inherited signal
properties. If some signals have been ignored (with
signal(SIG_IGN)) before zsh was exec()ed, then they are still
ignored by zsh. exec*() only resets the disposition of signals
which have a signal handler to SIG_DFL, but leaves SIG_IGNored
signals as is (this is a POSIX requirement).
I'd suggest changing init_signals to:
void
init_signals(void)
{
if (interact) {
int i;
signal_setmask(signal_mask(0));
for (i=0; i<NSIG; ++i)
signal_default(i);
}
sigchld_mask = signal_mask(SIGCHLD);
intr();
#ifndef QDEBUG
signal_ignore(SIGQUIT);
#endif
install_handler(SIGHUP);
install_handler(SIGCHLD);
#ifdef SIGWINCH
install_handler(SIGWINCH);
#endif
if (interact) {
install_handler(SIGALRM);
}
if (jobbing) {
signal_ignore(SIGTTOU);
signal_ignore(SIGTSTP);
signal_ignore(SIGTTIN);
}
}
Patch against 4.0.6 attached.
Phil.
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: zsh-4.0.6-signals.patch --]
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diff -rc zsh-4.0.6.orig/Src/init.c zsh-4.0.6/Src/init.c
*** zsh-4.0.6.orig/Src/init.c Fri Oct 25 19:43:15 2002
--- zsh-4.0.6/Src/init.c Fri Oct 25 20:19:02 2002
***************
*** 842,847 ****
--- 842,853 ----
void
init_signals(void)
{
+ if (interact) {
+ int i;
+ signal_setmask(signal_mask(0));
+ for (i=0; i<NSIG; ++i)
+ signal_default(i);
+ }
sigchld_mask = signal_mask(SIGCHLD);
intr();
***************
*** 857,887 ****
#endif
if (interact) {
install_handler(SIGALRM);
- signal_ignore(SIGTERM);
}
if (jobbing) {
! long ttypgrp;
!
! while ((ttypgrp = gettygrp()) != -1 && ttypgrp != mypgrp)
! kill(0, SIGTTIN);
! if (ttypgrp == -1) {
! opts[MONITOR] = 0;
! } else {
! signal_ignore(SIGTTOU);
! signal_ignore(SIGTSTP);
! signal_ignore(SIGTTIN);
! attachtty(mypgrp);
! }
! }
! if (islogin) {
! signal_setmask(signal_mask(0));
! } else if (interact) {
! sigset_t set;
!
! sigemptyset(&set);
! sigaddset(&set, SIGINT);
! sigaddset(&set, SIGQUIT);
! signal_unblock(set);
}
}
--- 863,873 ----
#endif
if (interact) {
install_handler(SIGALRM);
}
if (jobbing) {
! signal_ignore(SIGTTOU);
! signal_ignore(SIGTSTP);
! signal_ignore(SIGTTIN);
}
}
next reply other threads:[~2002-10-26 3:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-26 3:22 Philippe Troin [this message]
2002-11-04 14:04 ` Peter Stephenson
2002-11-04 19:22 ` Philippe Troin
2002-11-07 10:58 ` Peter Stephenson
2002-11-07 21:05 ` Philippe Troin
2002-11-08 10:44 ` Peter Stephenson
2002-11-09 1:14 ` Philippe Troin
2002-11-12 21:57 ` Zefram
2002-11-12 23:29 ` Philippe Troin
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