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Pedro Alves 336b30e58a Don't call sigtimedwait for scoped_ignore_sigttou 
Because SIGTTOU is sent to the whole process instead of to a specific
thread, consuming a pending SIGTTOU in the destructor of
scoped_ignore_sigttou could consume a SIGTTOU signal raised due to
actions done by some other thread.  Simply avoid sigtimedwait in
scoped_ignore_sigttou, thus plugging the race.  This works because we
know that when the thread writes to the terminal and the signal is
blocked, the kernel does not raise the signal at all.

Tested on GNU/Linux, Solaris 11 and FreeBSD.

gdb/ChangeLog:
yyyy-mm-dd  Pedro Alves  <pedro@palves.net>

	* scoped_ignore_signal.h (scoped_ignore_signal): Add
	ConsumePending template parameter.
	(scoped_ignore_signal::~scoped_ignore_signal): Skip calling
	sigtimedwait if ConsumePending is false.
	(scoped_ignore_sigpipe): Initialize with ConsumePending=true.
	* scoped_ignore_sigttou.h (scoped_ignore_sigttou)
	<m_ignore_signal>: Initialize with ConsumePending=false.

Change-Id: I92f754dbc45c45819dce2ce68b8c067d8d5c61b1
2021-06-17 19:39:08 +01:00
..
.dir-locals.el
gdb: additional settings for emacs in .dir-locals.el
2021-05-17 20:47:46 +01:00
.gitattributes
gdb, gdbserver, gdbsupport: add .gitattributes files
2020-03-05 15:59:22 +01:00
acinclude.m4
gdb: move ptrace.m4 to gdbsupport
2020-10-25 21:08:49 -04:00
aclocal.m4
gdb: use AC_PROG_CC_STDC instead of AM_PROG_CC_STDC
2020-10-31 08:30:57 -04:00
agent.cc
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2021-01-01 12:12:21 +04:00
agent.h
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alt-stack.h
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array-view.h
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ax.def
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block-signals.h
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break-common.h
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btrace-common.cc
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btrace-common.h
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buffer.cc
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buffer.h
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byte-vector.h
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ChangeLog
scoped_ignore_signal: Use sigprocmask+sigtimedwait instead of signal
2021-06-17 16:22:12 +01:00
check-defines.el
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cleanups.cc
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cleanups.h
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2021-01-01 12:12:21 +04:00
common-debug.cc
gdb: add remote_debug_printf
2021-01-22 12:43:27 -05:00
common-debug.h
gdbsupport: allow passing format string to scoped_debug_start_end
2021-04-24 19:26:41 -04:00
common-defs.h
gnulib: update to 776af40e0
2021-02-05 13:35:20 -05:00
common-exceptions.cc
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common-exceptions.h
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common-gdbthread.h
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common-inferior.cc
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common-inferior.h
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common-regcache.cc
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common-regcache.h
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common-types.h
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common-utils.cc
New memory-tag commands
2021-03-24 14:57:53 -03:00
common-utils.h
New memory-tag commands
2021-03-24 14:57:53 -03:00
common.m4
Don't run personality syscall at configure time; don't check it at all
2021-05-08 13:45:36 +01:00
config.in
gdbsupport: re-generate configure & friends
2021-05-08 21:27:49 -04:00
configure
gdbsupport: re-generate configure & friends
2021-05-08 21:27:49 -04:00
configure.ac
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create-version.sh
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def-vector.h
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default-init-alloc.h
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eintr.h
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enum-flags.h
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environ.cc
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environ.h
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errors.cc
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errors.h
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event-loop.cc
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event-loop.h
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fileio.cc
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fileio.h
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filestuff.cc
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filestuff.h
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filtered-iterator.h
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format.cc
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format.h
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forward-scope-exit.h
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function-view.h
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gdb_assert.h
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gdb_binary_search.h
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gdb_locale.h
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gdb_optional.h
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gdb_proc_service.h
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gdb_ref_ptr.h
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gdb_select.h
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gdb_setjmp.h
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gdb_signals.h
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gdb_splay_tree.h
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gdb_string_view.h
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gdb_string_view.tcc
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gdb_sys_time.h
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2021-01-01 12:12:21 +04:00
gdb_tilde_expand.cc
Improve gdb_tilde_expand logic.
2021-01-23 17:17:38 +00:00
gdb_tilde_expand.h
Improve gdb_tilde_expand logic.
2021-01-23 17:17:38 +00:00
gdb_unique_ptr.h
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gdb_unlinker.h
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gdb_vecs.cc
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gdb_vecs.h
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gdb_wait.cc
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gdb_wait.h
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gdb-dlfcn.cc
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gdb-dlfcn.h
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gdb-safe-ctype.h
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gdb-sigmask.h
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hash_enum.h
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host-defs.h
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job-control.cc
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job-control.h
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Makefile.am
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Makefile.in
gdbsupport: re-generate configure & friends
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netstuff.cc
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netstuff.h
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new-op.cc
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next-iterator.h
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observable.h
gdbsupport: allow to specify dependencies between observers
2021-04-27 11:22:32 -04:00
offset-type.h
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parallel-for.h
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pathstuff.cc
gdb: check for empty strings in get_standard_cache_dir/get_standard_config_dir
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pathstuff.h
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poison.h
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preprocessor.h
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print-utils.cc
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print-utils.h
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ptid.cc
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ptid.h
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ptrace.m4
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README
…
refcounted-object.h
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rsp-low.cc
New memory-tag commands
2021-03-24 14:57:53 -03:00
rsp-low.h
New memory-tag commands
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run-time-clock.cc
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run-time-clock.h
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safe-iterator.h
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safe-strerror.cc
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scope-exit.h
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scoped_fd.h
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scoped_ignore_signal.h
Don't call sigtimedwait for scoped_ignore_sigttou
2021-06-17 19:39:08 +01:00
scoped_ignore_sigttou.h
Don't call sigtimedwait for scoped_ignore_sigttou
2021-06-17 19:39:08 +01:00
scoped_mmap.cc
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scoped_mmap.h
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scoped_restore.h
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search.cc
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search.h
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selftest.cc
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selftest.h
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selftest.m4
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signals-state-save-restore.cc
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signals-state-save-restore.h
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signals.cc
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symbol.h
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tdesc.cc
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tdesc.h
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thread-pool.cc
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thread-pool.h
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traits.h
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underlying.h
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valid-expr.h
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version.h
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warning.m4
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x86-xstate.h
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xml-utils.cc
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xml-utils.h
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README 

This is a helper library that is used by gdb and gdbserver.

To send patches, follow the gdb patch submission instructions in
../gdb/CONTRIBUTE.  For maintainers, see ../gdb/MAINTAINERS.