acrn-kernel/arch/um
Steven Rostedt 69be8f1896 [PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is
not consistent with the way other Unix boxes handle it.  I've written a
program to test the behavior of how this flag affects signals and had
several reports from people who ran this on various Unix boxes,
confirming that Linux seems to be unique on the way this is handled.

The way NODEFER affects signals on other Unix boxes is as follows:

1) If NODEFER is set, other signals in sa_mask are still blocked.

2) If NODEFER is set and the signal is in sa_mask, then the signal is
still blocked. (Note: this is the behavior of all tested but Linux _and_
NetBSD 2.0 *).

The way NODEFER affects signals on Linux:

1) If NODEFER is set, other signals are _not_ blocked regardless of
sa_mask (Even NetBSD doesn't do this).

2) If NODEFER is set and the signal is in sa_mask, then the signal being
handled is not blocked.

The patch converts signal handling in all current Linux architectures to
the way most Unix boxes work.

Unix boxes that were tested:  DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU
3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX.

* NetBSD was the only other Unix to behave like Linux on point #2. The
main concern was brought up by point #1 which even NetBSD isn't like
Linux.  So with this patch, we leave NetBSD as the lonely one that
behaves differently here with #2.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29 10:03:11 -07:00
..
drivers [PATCH] mmaper_kern.c fixes [buffer overruns] 2005-08-27 10:11:40 -07:00
include [PATCH] uml: Proper clone support for skas0 2005-07-07 18:23:44 -07:00
kernel [PATCH] convert signal handling of NODEFER to act like other Unix boxes. 2005-08-29 10:03:11 -07:00
os-Linux [PATCH] uml: fix the x86_64 build 2005-08-18 12:53:58 -07:00
scripts [PATCH] uml: allow building as 32-bit binary on 64bit host 2005-07-14 09:00:25 -07:00
sys-i386 [PATCH] uml: Fix skas0 stub return 2005-07-28 21:46:04 -07:00
sys-ia64
sys-ppc
sys-x86_64 [PATCH] uml: workaround host bug in "TT mode vs. NPTL link fix" 2005-07-14 09:00:24 -07:00
util
Kconfig [NET]: add a top-level Networking menu to *config 2005-07-11 21:03:49 -07:00
Kconfig.debug
Kconfig_char
Kconfig_i386 [PATCH] uml: skas0 - separate kernel address space on stock hosts 2005-07-07 18:23:44 -07:00
Kconfig_net [PATCH] uml: reintroduce pcap support 2005-07-14 09:00:25 -07:00
Kconfig_scsi
Kconfig_x86_64 [PATCH] uml: skas0 - separate kernel address space on stock hosts 2005-07-07 18:23:44 -07:00
Makefile [PATCH] uml: add dependency to arch/um/Makefile for parallel builds 2005-07-27 16:25:48 -07:00
Makefile-i386 [PATCH] uml: readd missing define to arch/um/Makefile-i386 2005-07-27 16:25:48 -07:00
Makefile-ia64
Makefile-os-Linux
Makefile-ppc
Makefile-skas
Makefile-tt
Makefile-x86_64 [PATCH] uml: allow building as 32-bit binary on 64bit host 2005-07-14 09:00:25 -07:00
config.release
defconfig [PATCH] uml: skas0 - separate kernel address space on stock hosts 2005-07-07 18:23:44 -07:00