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authorPedro Alves <palves@redhat.com>2016-08-09 20:16:20 +0100
committerPedro Alves <palves@redhat.com>2016-08-09 20:16:20 +0100
commitf348d89aeccaf3eb613e2f31a823baa64300bf88 (patch)
tree66f0119540539603832d1b3170848b1f9711b43a /gdb/main.c
parent7cfee229f1eb6e3ee98b63918a5189a330284751 (diff)
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Fix PR gdb/18653: gdb disturbs inferior's inherited signal dispositions
gdb's (or gdbserver's) own signal handling should not interfere with the signal dispositions their spawned children inherit. However, it currently does. For example, some paths in gdb cause SIGPIPE to be set to SIG_IGN, and as consequence, the child starts with SIGPIPE to set to SIG_IGN too, even though gdb was started with SIGPIPE set to SIG_DFL. This is because the exec family of functions does not reset the signal disposition of signals that are set to SIG_IGN: http://pubs.opengroup.org/onlinepubs/7908799/xsh/execve.html Signals set to the default action (SIG_DFL) in the calling process image are set to the default action in the new process image. Signals set to be ignored (SIG_IGN) by the calling process image are set to be ignored by the new process image. Signals set to be caught by the calling process image are set to the default action in the new process image (see <signal.h>). And neither does it reset signal masks or flags. In order to be transparent, when spawning new child processes to debug (with "run", etc.), reset signal actions and mask back to what was originally inherited from gdb/gdbserver's parent, just before execing the target program to debug. gdb/ChangeLog: 2016-08-09 Pedro Alves <palves@redhat.com> PR gdb/18653 * Makefile.in (SFILES): Add common/signals-state-save-restore.c. (HFILES_NO_SRCDIR): Add common/signals-state-save-restore.h. (COMMON_OBS): Add signals-state-save-restore.o. (signals-state-save-restore.o): New rule. * configure: Regenerate. * fork-child.c: Include "signals-state-save-restore.h". (fork_inferior): Call restore_original_signals_state. * main.c: Include "signals-state-save-restore.h". (captured_main): Call save_original_signals_state. * common/common.m4: Add sigaction to AC_CHECK_FUNCS checks. * common/signals-state-save-restore.c: New file. * common/signals-state-save-restore.h: New file. gdb/gdbserver/ChangeLog: 2016-08-09 Pedro Alves <palves@redhat.com> PR gdb/18653 * Makefile.in (OBS): Add signals-state-save-restore.o. (signals-state-save-restore.o): New rule. * config.in: Regenerate. * configure: Regenerate. * linux-low.c: Include "signals-state-save-restore.h". (linux_create_inferior): Call restore_original_signals_state. * server.c: Include "dispositions-save-restore.h". (captured_main): Call save_original_signals_state. gdb/testsuite/ChangeLog: 2016-08-09 Pedro Alves <palves@redhat.com> PR gdb/18653 * gdb.base/signals-state-child.c: New file. * gdb.base/signals-state-child.exp: New file. * gdb.gdb/selftest.exp (do_steps_and_nexts): Add new pattern.
Diffstat (limited to 'gdb/main.c')
-rw-r--r--gdb/main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/gdb/main.c b/gdb/main.c
index 5477379..23d4ca0 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -44,6 +44,7 @@
#include <signal.h>
#include "event-top.h"
#include "infrun.h"
+#include "signals-state-save-restore.h"
/* The selected interpreter. This will be used as a set command
variable, so it should always be malloc'ed - since
@@ -505,6 +506,7 @@ captured_main (void *data)
bfd_init ();
notice_open_fds ();
+ save_original_signals_state ();
make_cleanup (VEC_cleanup (cmdarg_s), &cmdarg_vec);
dirsize = 1;