Handle sigmask better with nested signal handlers.

* atimer.c (sigmask_atimers): Remove.
Remaining use rewritten to use body of this function.
* atimer.c (block_atimers, unblock_atimers):
* callproc.c (block_child_signal, unblock_child_signal):
* sysdep.c (block_tty_out_signal, unblock_tty_out_signal):
New arg OLDSET.  All callers changed.
* atimer.c (block_atimers, unblock_atimers):
* callproc.c (block_child_signal, unblock_child_signal):
* keyboard.c (handle_interrupt):
* sound.c (vox_configure, vox_close):
Restore the old signal mask rather than unilaterally clearing bits
from the mask, in case a handler is running within another
handler.  All callers changed.
* lisp.h, process.c, process.h, term.c:
Adjust decls and callers to match new API.
* sysdep.c (emacs_sigaction_init): Don't worry about masking SIGFPE;
signal handlers aren't supposed to use floating point anyway.
(handle_arith_signal): Unblock just SIGFPE rather than clearing mask.

Fixes: debbugs:15561

1 files changed, 22 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index d9e99722319..44ebe76555c 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,25 @@
+2014-03-25  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Handle sigmask better with nested signal handlers  (Bug#15561).
+        * atimer.c (sigmask_atimers): Remove.
+        Remaining use rewritten to use body of this function.
+        * atimer.c (block_atimers, unblock_atimers):
+        * callproc.c (block_child_signal, unblock_child_signal):
+        * sysdep.c (block_tty_out_signal, unblock_tty_out_signal):
+        New arg OLDSET.  All callers changed.
+        * atimer.c (block_atimers, unblock_atimers):
+        * callproc.c (block_child_signal, unblock_child_signal):
+        * keyboard.c (handle_interrupt):
+        * sound.c (vox_configure, vox_close):
+        Restore the old signal mask rather than unilaterally clearing bits
+        from the mask, in case a handler is running within another
+        handler.  All callers changed.
+        * lisp.h, process.c, process.h, term.c:
+        Adjust decls and callers to match new API.
+        * sysdep.c (emacs_sigaction_init): Don't worry about masking SIGFPE;
+        signal handlers aren't supposed to use floating point anyway.
+        (handle_arith_signal): Unblock just SIGFPE rather than clearing mask.
+
 2014-03-23  Daniel Colascione  <dancol@dancol.org>
 
         Split gc_sweep into discrete functions for legibility and better