GNU bug report logs - #17561
24.4.50; Emacs can forget processes

Previous Next

Full log

View this message in rfc822 format

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Jorgen Schaefer <forcer <at> forcix.cx>
Cc: 17561 <at> debbugs.gnu.org, Paul Eggert <eggert <at> cs.ucla.edu>
Subject: bug#17561: Emacs can forget processes
Date: Thu, 29 May 2014 19:55:20 +0200

Jorgen Schaefer <forcer <at> forcix.cx> writes:

> It works. A bit later:
>
> rt_sigprocmask(SIG_BLOCK, [CHLD], [QUIT ALRM PROF], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [QUIT ALRM PROF], NULL, 8) = 0
>
> That's fine, CHLD is not masked. A while later, then, this:
>
> --- SIGIO (I/O possible) @ 0 (0) ---
> rt_sigreturn(0x1d)                      = 11684722
> ioctl(3, FIONREAD, [0])                 = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [QUIT ALRM CHLD PROF], 8) = 0

So the damage happend somewhere between these blocks.  Please try this
patch to better see when CHLD became blocked:

diff --git a/src/sysdep.c b/src/sysdep.c
index e5b2920..35c2856 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -618,6 +618,7 @@ request_sigio (void)
 {
 #ifdef USABLE_SIGIO
   sigset_t unblocked;
+  sigset_t oldmask;
 
   if (noninteractive)
     return;
@@ -627,7 +628,7 @@ request_sigio (void)
   sigaddset (&unblocked, SIGWINCH);
 # endif
   sigaddset (&unblocked, SIGIO);
-  pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
+  pthread_sigmask (SIG_UNBLOCK, &unblocked, &oldmask);
 
   interrupts_deferred = 0;
 #endif
@@ -638,6 +639,7 @@ unrequest_sigio (void)
 {
 #ifdef USABLE_SIGIO
   sigset_t blocked;
+  sigset_t oldmask;
 
   if (noninteractive)
     return;
@@ -647,7 +649,7 @@ unrequest_sigio (void)
   sigaddset (&blocked, SIGWINCH);
 # endif
   sigaddset (&blocked, SIGIO);
-  pthread_sigmask (SIG_BLOCK, &blocked, 0);
+  pthread_sigmask (SIG_BLOCK, &blocked, &oldmask);
   interrupts_deferred = 1;
 #endif
 }


Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.