f348d89aec
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.
48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
dnl Autoconf configure snippets for common.
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dnl Copyright (C) 1995-2016 Free Software Foundation, Inc.
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dnl
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dnl This file is part of GDB.
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dnl
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dnl This program is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU General Public License as published by
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dnl the Free Software Foundation; either version 3 of the License, or
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dnl (at your option) any later version.
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dnl
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dnl This program is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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dnl GNU General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU General Public License
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dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
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dnl Invoke configury needed by the files in 'common'.
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AC_DEFUN([GDB_AC_COMMON], [
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AC_HEADER_STDC
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AC_FUNC_ALLOCA
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dnl Note that this requires codeset.m4, which is included
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dnl by the users of common.m4.
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AM_LANGINFO_CODESET
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AC_CHECK_HEADERS(linux/perf_event.h locale.h memory.h signal.h dnl
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sys/resource.h sys/socket.h sys/syscall.h dnl
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sys/un.h sys/wait.h dnl
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thread_db.h wait.h)
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AC_CHECK_FUNCS([fdwalk getrlimit pipe pipe2 socketpair sigaction])
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AC_CHECK_DECLS([strerror, strstr])
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dnl Check if sigsetjmp is available. Using AC_CHECK_FUNCS won't
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dnl do since sigsetjmp might only be defined as a macro.
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AC_CACHE_CHECK([for sigsetjmp], gdb_cv_func_sigsetjmp,
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[AC_TRY_COMPILE([
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#include <setjmp.h>
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], [sigjmp_buf env; while (! sigsetjmp (env, 1)) siglongjmp (env, 1);],
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gdb_cv_func_sigsetjmp=yes, gdb_cv_func_sigsetjmp=no)])
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if test $gdb_cv_func_sigsetjmp = yes; then
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AC_DEFINE(HAVE_SIGSETJMP, 1, [Define if sigsetjmp is available. ])
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fi
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])
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