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binutils-gdb/gdb/config.in
Pedro Alves e671cd59d7 Per-inferior target_terminal state, fix PR gdb/13211, more 
In my multi-target branch I ran into problems with GDB's terminal
handling that exist in master as well, with multi-inferior debugging.

This patch adds a testcase for said problems
(gdb.multi/multi-term-settings.exp), fixes the problems, fixes PR
gdb/13211 as well (and adds a testcase for that too,
gdb.base/interrupt-daemon.exp).

The basis of the problem I ran into is the following.  Consider a
scenario where you have:

 - inferior 1 - started with "attach", process is running on some
   other terminal.

 - inferior 2 - started with "run", process is sharing gdb's terminal.

In this scenario, when you stop/resume both inferiors, you want GDB to
save/restore the terminal settings of inferior 2, the one that is
sharing GDB's terminal.  I.e., you want inferior 2 to "own" the
terminal (in target_terminal::is_ours/target_terminal::is_inferior
sense).

Unfortunately, that's not what you get currently.  Because GDB doesn't
know whether an attached inferior is actually sharing GDB's terminal,
it tries to save/restore its settings anyway, ignoring errors.  In
this case, this is pointless, because inferior 1 is running on a
different terminal, but GDB doesn't know better.

And then, because it is only possible to have the terminal settings of
a single inferior be in effect at a time, or make one inferior/pgrp be
the terminal's foreground pgrp (aka, only one inferior can "own" the
terminal, ignoring fork children here), if GDB happens to try to
restore the terminal settings of inferior 1 first, then GDB never
restores the terminal settings of inferior 2.

This patch fixes that and a few things more along the way:

 - Moves enum target_terminal::terminal_state out of the
   target_terminal class (it's currently private) and makes it a
   scoped enum so that it can be easily used elsewhere.

 - Replaces the inflow.c:terminal_is_ours boolean with a
   target_terminal_state variable.  This allows distinguishing is_ours
   and is_ours_for_output states.  This allows finally making
   child_terminal_ours_1 do something with its "output_only"
   parameter.

 - Makes each inferior have its own copy of the
   is_ours/is_ours_for_output/is_inferior state.

 - Adds a way for GDB to tell whether the inferior is sharing GDB's
   terminal.  Works best on Linux and Solaris; the fallback works just
   as well as currently.

 - With that, we can remove the inf->attach_flag tests from
   child_terminal_inferior/child_terminal_ours.

 - Currently target_ops.to_ours is responsible for both saving the
   current inferior's terminal state, and restoring gdb's state.
   Because each inferior has its own terminal state (possibly handled
   by different targets in a multi-target world, even), we need to
   split the inferior-saving part from the gdb-restoring part.  The
   patch adds a new target_ops.to_save_inferior target method for
   that.

 - Adds a new target_terminal::save_inferior() function, so that
   sequences like:

     scoped_restore_terminal_state save_state;
     target_terminal::ours_for_output ();

   ... restore back inferiors that were
   target_terminal_state::is_inferior before back to is_inferior, and
   leaves inferiors that were is_ours alone.

 - Along the way, this adds a default implementation of
   target_pass_ctrlc to inflow.c (for inf-child.c), that handles
   passing the Ctrl-C to a process running on GDB's terminal or to
   some other process otherwise.

 - Similarly, adds a new target default implementation of
   target_interrupt, for the "interrupt" command.  The current
   implementation of this hook in inf-ptrace.c kills the whole process
   group, but that's incorrect/undesirable because we may not be
   attached to all processes in the process group.  And also, it's
   incorrect because inferior_process_group() doesn't really return
   the inferior's real process group id if the inferior is not a
   process group leader...  This is the cause of PR gdb/13211 [1],
   which this patch fixes.  While at it, that target method's "ptid"
   parameter is eliminated, because it's not really used.

 - A new test is included that exercises and fixes PR gdb/13211, and
   also fixes a GDB issue reported on stackoverflow that I ran into
   while working on this [2].  The problem is similar to PR gdb/13211,
   except that it also triggers with Ctrl-C.  When debugging a daemon
   (i.e., a process that disconnects from the controlling terminal and
   is not a process group leader, then Ctrl-C doesn't work, you just
   can't interrupt the inferior at all, resulting in a hung debug
   session.  The problem is that since the inferior is no longer
   associated with gdb's session / controlling terminal, then trying
   to put the inferior in the foreground fails.  And so Ctrl-C never
   reaches the inferior directly.  pass_signal is only used when the
   inferior is attached, but that is not the case here.  This is fixed
   by the new child_pass_ctrlc.  Without the fix, the new
   interrupt-daemon.exp testcase fails with timeout waiting for a
   SIGINT that never arrives.

[1] PR gdb/13211 - Async / Process group and interrupt not working
https://sourceware.org/bugzilla/show_bug.cgi?id=13211

[2] GDB not reacting Ctrl-C when after fork() and setsid()
https://stackoverflow.com/questions/46101292/gdb-not-reacting-ctrl-c-when-after-fork-and-setsid

Note this patch does _not_ fix:

 - PR gdb/14559 - The 'interrupt' command does not work if sigwait is in use
   https://sourceware.org/bugzilla/show_bug.cgi?id=14559

 - PR gdb/9425 - When using "sigwait" GDB doesn't trap SIGINT. Ctrl+C terminates program when should break gdb.
   https://sourceware.org/bugzilla/show_bug.cgi?id=9425

The only way to fix that that I know of (without changing the kernel)
is to make GDB put inferiors in a separate session (create a
pseudo-tty master/slave pair, make the inferior run with the slave as
its terminal, and have gdb pump output/input on the master end).

gdb/ChangeLog:
2018-01-30  Pedro Alves  <palves@redhat.com>

	PR gdb/13211
	* config.in, configure: Regenerate.
	* configure.ac: Check for getpgid.
	* go32-nat.c (go32_pass_ctrlc): New.
	(go32_target): Install it.
	* inf-child.c (inf_child_target): Install
	child_terminal_save_inferior, child_pass_ctrlc and
	child_interrupt.
	* inf-ptrace.c (inf_ptrace_interrupt): Delete.
	(inf_ptrace_target): No longer install it.
	* infcmd.c (interrupt_target_1): Adjust.
	* inferior.h (child_terminal_save_inferior, child_pass_ctrlc)
	(child_interrupt): Declare.
	(inferior::terminal_state): New.
	* inflow.c (struct terminal_info): Update comments.
	(inferior_process_group): Delete.
	(terminal_is_ours): Delete.
	(gdb_tty_state): New.
	(child_terminal_init): Adjust.
	(is_gdb_terminal, sharing_input_terminal_1)
	(sharing_input_terminal): New functions.
	(child_terminal_inferior): Adjust.  Use sharing_input_terminal.
	Set the process's actual process group in the foreground if
	possible.  Handle is_ours_for_output/is_ours distinction.  Don't
	mark terminal as the inferior's if not sharing GDB's terminal.
	Don't check attach_flag.
	(child_terminal_ours_for_output, child_terminal_ours): Adjust to
	pass down a target_terminal_state.
	(child_terminal_save_inferior): New, factored out from ...
	(child_terminal_ours_1): ... this.  Handle
	target_terminal_state::is_ours_for_output.
	(child_interrupt, child_pass_ctrlc): New.
	(inflow_inferior_exit): Clear the inferior's terminal_state.
	(copy_terminal_info): Copy the inferior's terminal state.
	(_initialize_inflow): Remove reference to terminal_is_ours.
	* inflow.h (inferior_process_group): Delete.
	* nto-procfs.c (nto_handle_sigint, procfs_interrupt): Adjust.
	* procfs.c (procfs_target): Don't install procfs_interrupt.
	(procfs_interrupt): Delete.
	* remote.c (remote_serial_quit_handler): Adjust.
	(remote_interrupt): Remove ptid parameter.  Adjust.
	* target-delegates.c: Regenerate.
	* target.c: Include "terminal.h".
	(target_terminal::terminal_state): Rename to ...
	(target_terminal::m_terminal_state): ... this.
	(target_terminal::init): Adjust.
	(target_terminal::inferior): Adjust to per-inferior
	terminal_state.
	(target_terminal::restore_inferior, target_terminal_is_ours_kind): New.
	(target_terminal::ours, target_terminal::ours_for_output): Use
	target_terminal_is_ours_kind.
	(target_interrupt): Remove ptid parameter.  Adjust.
	(default_target_pass_ctrlc): Adjust.
	* target.h (target_ops::to_terminal_save_inferior): New field.
	(target_ops::to_interrupt): Remove ptid_t parameter.
	(target_interrupt): Remove ptid_t parameter.  Update comment.
	(target_pass_ctrlc): Update comment.
	* target/target.h (target_terminal_state): New scoped enum,
	factored out of ...
	(target_terminal::terminal_state): ... here.
	(target_terminal::inferior): Update comments.
	(target_terminal::restore_inferior): New.
	(target_terminal::is_inferior, target_terminal::is_ours)
	(target_terminal::is_ours_for_output): Adjust.
	(target_terminal::scoped_restore_terminal_state): Adjust to
	rename, and call restore_inferior() instead of inferior().
	(target_terminal::scoped_restore_terminal_state::m_state): Change
	type.
	(target_terminal::terminal_state): Rename to ...
	(target_terminal::m_terminal_state): ... this and change type.

gdb/gdbserver/ChangeLog:
2018-01-30  Pedro Alves  <palves@redhat.com>

	PR gdb/13211
	* target.c (target_terminal::terminal_state): Rename to ...
	(target_terminal::m_terminal_state): ... this.

gdb/testsuite/ChangeLog:
2018-01-30  Pedro Alves  <palves@redhat.com>

	PR gdb/13211
	* gdb.base/interrupt-daemon.c: New.
	* gdb.base/interrupt-daemon.exp: New.
	* gdb.multi/multi-term-settings.c: New.
	* gdb.multi/multi-term-settings.exp: New.
2018-01-30 14:55:18 +00:00

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/* config.in. Generated from configure.ac by autoheader. */
/* Define if building universal (internal helper macro) */
#undef AC_APPLE_UNIVERSAL_BUILD
/* Directories from which to load auto-loaded scripts. */
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/* nativefile */
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/* Define to the default OS ABI for this configuration. */
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/* Define to 1 if you have the <sys/procfs.h> header file. */
#undef HAVE_SYS_PROCFS_H
/* Define to 1 if you have the <sys/ptrace.h> header file. */
#undef HAVE_SYS_PTRACE_H
/* Define to 1 if you have the <sys/reg.h> header file. */
#undef HAVE_SYS_REG_H
/* Define to 1 if you have the <sys/resource.h> header file. */
#undef HAVE_SYS_RESOURCE_H
/* Define to 1 if you have the <sys/select.h> header file. */
#undef HAVE_SYS_SELECT_H
/* Define to 1 if you have the <sys/socket.h> header file. */
#undef HAVE_SYS_SOCKET_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have the <sys/un.h> header file. */
#undef HAVE_SYS_UN_H
/* Define to 1 if you have the <sys/user.h> header file. */
#undef HAVE_SYS_USER_H
/* Define to 1 if you have the <sys/wait.h> header file. */
#undef HAVE_SYS_WAIT_H
/* Define to 1 if you have the <termios.h> header file. */
#undef HAVE_TERMIOS_H
/* Define to 1 if you have the <term.h> header file. */
#undef HAVE_TERM_H
/* Define to 1 if you have the <thread_db.h> header file. */
#undef HAVE_THREAD_DB_H
/* Define to 1 if you have the `ttrace' function. */
#undef HAVE_TTRACE
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to 1 if you have the `vfork' function. */
#undef HAVE_VFORK
/* Define to 1 if you have the <vfork.h> header file. */
#undef HAVE_VFORK_H
/* Define to 1 if you have the `waitpid' function. */
#undef HAVE_WAITPID
/* Define to 1 if you have the <wait.h> header file. */
#undef HAVE_WAIT_H
/* Define to 1 if you have the `wborder' function. */
#undef HAVE_WBORDER
/* Define to 1 if you have the <windows.h> header file. */
#undef HAVE_WINDOWS_H
/* Define to 1 if `fork' works. */
#undef HAVE_WORKING_FORK
/* Define to 1 if `vfork' works. */
#undef HAVE_WORKING_VFORK
/* Define to 1 if you have the `wresize' function. */
#undef HAVE_WRESIZE
/* Define to 1 if you have the `XML_StopParser' function. */
#undef HAVE_XML_STOPPARSER
/* Define to 1 if your system has the _etext variable. */
#undef HAVE__ETEXT
/* Define to 1 if you have the `_mcleanup' function. */
#undef HAVE__MCLEANUP
/* Path of directory of iconv program. */
#undef ICONV_BIN
/* Define if the iconv directory should be relocated when GDB is moved. */
#undef ICONV_BIN_RELOCATABLE
/* Define as const if the declaration of iconv() needs const. */
#undef ICONV_CONST
/* directory to load the JIT readers from */
#undef JIT_READER_DIR
/* Define if the jit-reader-dir directory should be relocated when GDB is
moved. */
#undef JIT_READER_DIR_RELOCATABLE
/* Name of this package. */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the home page for this package. */
#undef PACKAGE_URL
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Additional package description */
#undef PKGVERSION
/* Define if the prfpregset_t type is broken. */
#undef PRFPREGSET_T_BROKEN
/* Define to 1 if the "%H, %D and %DD" formats work to print decfloats. */
#undef PRINTF_HAS_DECFLOAT
/* Define to 1 if the "%Lg" format works to print long doubles. */
#undef PRINTF_HAS_LONG_DOUBLE
/* Define to 1 if the "%ll" format works to print long longs. */
#undef PRINTF_HAS_LONG_LONG
/* Define to the type of arg 1 for ptrace. */
#undef PTRACE_TYPE_ARG1
/* Define to the type of arg 3 for ptrace. */
#undef PTRACE_TYPE_ARG3
/* Define to the type of arg 4 for ptrace. */
#undef PTRACE_TYPE_ARG4
/* Define to the type of arg 5 for ptrace. */
#undef PTRACE_TYPE_ARG5
/* Define as the return type of ptrace. */
#undef PTRACE_TYPE_RET
/* Define if the python directory should be relocated when GDB is moved. */
#undef PYTHON_PATH_RELOCATABLE
/* Relocated directory for source files. */
#undef RELOC_SRCDIR
/* Bug reporting address */
#undef REPORT_BUGS_TO
/* Define to 1 if the "%Lg" format works to scan long doubles. */
#undef SCANF_HAS_LONG_DOUBLE
/* Define to 1 if the `setpgrp' function takes no argument. */
#undef SETPGRP_VOID
/* The size of `long', as computed by sizeof. */
#undef SIZEOF_LONG
/* The size of `long long', as computed by sizeof. */
#undef SIZEOF_LONG_LONG
/* The size of `unsigned long', as computed by sizeof. */
#undef SIZEOF_UNSIGNED_LONG
/* The size of `unsigned long long', as computed by sizeof. */
#undef SIZEOF_UNSIGNED_LONG_LONG
/* The size of `unsigned __int128', as computed by sizeof. */
#undef SIZEOF_UNSIGNED___INT128
/* If using the C implementation of alloca, define if you know the
direction of stack growth for your system; otherwise it will be
automatically deduced at runtime.
STACK_DIRECTION > 0 => grows toward higher addresses
STACK_DIRECTION < 0 => grows toward lower addresses
STACK_DIRECTION = 0 => direction of growth unknown */
#undef STACK_DIRECTION
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* automatically load a system-wide gdbinit file */
#undef SYSTEM_GDBINIT
/* Define if the system-gdbinit directory should be relocated when GDB is
moved. */
#undef SYSTEM_GDBINIT_RELOCATABLE
/* search for usr/lib et al within DIR */
#undef TARGET_SYSTEM_ROOT
/* Define if the sysroot directory should be relocated when GDB is moved. */
#undef TARGET_SYSTEM_ROOT_RELOCATABLE
/* Define if <thread_db.h> has the TD_NOTALLOC error code. */
#undef THREAD_DB_HAS_TD_NOTALLOC
/* Define if <thread_db.h> has the TD_NOTLS error code. */
#undef THREAD_DB_HAS_TD_NOTLS
/* Define if <thread_db.h> has the TD_VERSION error code. */
#undef THREAD_DB_HAS_TD_VERSION
/* Define to 1 if the regex included in libiberty should be used. */
#undef USE_INCLUDED_REGEX
/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable GNU extensions on systems that have them. */
#ifndef _GNU_SOURCE
# undef _GNU_SOURCE
#endif
/* Enable threading extensions on Solaris. */
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#endif
/* Enable extensions on HP NonStop. */
#ifndef _TANDEM_SOURCE
# undef _TANDEM_SOURCE
#endif
/* Enable general extensions on Solaris. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
/* Define if we should use the Windows API, instead of the POSIX API. On
Windows, we use the Windows API when building for MinGW, but the POSIX API
when building for Cygwin. */
#undef USE_WIN32API
/* Define if the PPC simulator is being linked in. */
#undef WITH_PPC_SIM
/* Define if --with-python provides a path, either directly or via
python-config.py --exec-prefix. */
#undef WITH_PYTHON_PATH
/* Define if the simulator is being linked in. */
#undef WITH_SIM
/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
significant byte first (like Motorola and SPARC, unlike Intel). */
#if defined AC_APPLE_UNIVERSAL_BUILD
# if defined __BIG_ENDIAN__
# define WORDS_BIGENDIAN 1
# endif
#else
# ifndef WORDS_BIGENDIAN
# undef WORDS_BIGENDIAN
# endif
#endif
/* Number of bits in a file offset, on hosts where this is settable. */
#undef _FILE_OFFSET_BITS
/* Define for large files, on AIX-style hosts. */
#undef _LARGE_FILES
/* Define to 1 if on MINIX. */
#undef _MINIX
/* Define to 2 if the system does not provide POSIX.1 features except with
this defined. */
#undef _POSIX_1_SOURCE
/* Define to 1 if you need to in order for `stat' and other things to work. */
#undef _POSIX_SOURCE
/* Define to empty if `const' does not conform to ANSI C. */
#undef const
/* Define to `__inline__' or `__inline' if that's what the C compiler
calls it, or to nothing if 'inline' is not supported under any name. */
#ifndef __cplusplus
#undef inline
#endif
/* Define to `int' if <sys/types.h> does not define. */
#undef pid_t
/* Define as `fork' if `vfork' does not work. */
#undef vfork
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