This adds _hurd_sigstate_set_global_rcv used by libpthread to enable
POSIX-confirming behavior of signals on a per-thread basis.
This also provides a sigstate destructor _hurd_sigstate_delete, and a
global process signal state, which needs to be locked and check when
global disposition is enabled, thus the addition of _hurd_sigstate_lock
_hurd_sigstate_actions _hurd_sigstate_pending _hurd_sigstate_unlock helpers.
This also updates all the glibc code accordingly.
This also drops support for get_int(INIT_SIGMASK), which did not make sense
any more since we do not have a single signal thread any more.
During fork/spawn, this also reinitializes the child global sigstate's
lock. That cures an issue that would very rarely cause a deadlock in the
child in fork, tries to unlock ss' critical section lock at the end of
fork. This will typically (always?) be observed in /bin/sh, which is not
surprising as that is the foremost caller of fork.
To reproduce an intermediate state, add an endless loop if
_hurd_global_sigstate is locked after __proc_dostop (cast through
volatile); that is, while still being in the fork's parent process.
When that triggers (use the libtool testsuite), the signal thread has
already locked ss (which is _hurd_global_sigstate), and is stuck at
hurdsig.c:685 in post_signal, trying to lock _hurd_siglock (which the
main thread already has locked and keeps locked until after
__task_create). This is the case that ss->thread == MACH_PORT_NULL, that
is, a global signal. In the main thread, between __proc_dostop and
__task_create is the __thread_abort call on the signal thread which would
abort any current kernel operation (but leave ss locked). Later in fork,
in the parent, when _hurd_siglock is unlocked in fork, the parent's
signal thread can proceed and will unlock eventually the global sigstate.
In the client, _hurd_siglock will likewise be unlocked, but the global
sigstate never will be, as the client's signal thread has been configured
to restart execution from _hurd_msgport_receive. Thus, when the child
tries to unlock ss' critical section lock at the end of fork, it will
first lock the global sigstate, will spin trying to lock it, which can
never be successful, and we get our deadlock.
Options seem to be:
* Move the locking of _hurd_siglock earlier in post_signal -- but that
may generally impact performance, if this locking isn't generally
needed anyway?
On the other hand, would it actually make sense to wait here until we
are not any longer in a critical section (which is meant to disable
signal delivery anyway (but not for preempted signals?))?
* Clear the global sigstate in the fork's child with the rationale that
we're anyway restarting the signal thread from a clean state. This
has now been implemented.
Why has this problem not been observed before Jérémie's patches? (Or has
it? Perhaps even more rarely?) In _S_msg_sig_post, the signal is now
posted to a *global receiver thread*, whereas previously it was posted to
the *designated signal-receiving thread*. The latter one was in a
critical section in fork, so didn't try to handle the signal until after
leaving the critical section? (Not completely analyzed and verified.)
Another question is what the signal is that is being received
during/around the time __proc_dostop executes.
From: Emilio Pozuelo Monfort <pochu27@gmail.com>
From: Svante Signell <svante.signell@gmail.com>
Pass the file paths of executable to the exec server, both relative and
absolute, which exec needs to properly execute and avertise #!-scripts.
Previously, the exec server tried to guess the name from argv[0] but argv[0]
only contains the executable name by convention.
* hurd/hurdexec.c (_hurd_exec): Deprecate function.
(_hurd_exec_paths): New function.
* hurd/hurd.h (_hurd_exec): Deprecate function.
(_hurd_exec_paths): Declare function.
* hurd/Versions: Export _hurd_exec_paths.
* sysdeps/mach/hurd/execve.c: Include <stdlib.h> and <stdio.h>
(__execve): Use __getcwd to build absolute path, and use
_hurd_exec_paths instead of _hurd_exec.
* sysdeps/mach/hurd/spawni.c: Likewise.
* sysdeps/mach/hurd/fexecve.c: Use _hurd_exec_paths instead of
_hurd_exec.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
* hurd/hurd-raise.c (_hurd_raise_signal): Pass sigcode in msg_sig_post
rpc.
* hurd/hurdmsg.c (_S_msg_set_environment): Use argz.h functions
instead of _hurd_split_args.
(_S_msg_*_exec_flags): Functions removed.
(_S_msg_startup_dosync): Stub removed.
Sat May 4 02:11:55 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* sysdeps/mach/hurd/ptrace.c: Set _hurdsig_traced instead of
EXEC_TRACED bit in _hurd_exec_flags.
Pass sigcode arg in msg_sig_post_untraced rpc.
* sysdeps/mach/hurd/access.c: Don't pass io port in
auth_user_authenticate rpc.
* posix/sched.h: Fix typos.
* sysdeps/mach/hurd/fork.c: Use new critical section lock.
Clear _hurdsig_traced instead of EXEC_TRACED.
* sysdeps/stub/nanosleep.c (nanosleep): Fix typo.
* wcsmbs/wcstol.c: Find strtol.c in ../stdlib.
* wcsmbs/wcstof.c: Find strtod.c in ../stdlib.
* wcsmbs/wcstod.c: Likewise.
* wcsmbs/wcstold.c: Likewise.
* wcsmbs/wcwidth.h: Find cname-lookup.h in ../wctype.
* string/envz.c (envz_entry): Use const.
(envz_get, envz_remove): Likewise.
(envz_entry): Return char *, not const char *.
* string/envz.h: Fix decl.
* string/argz-create.c: Use const in prototype.
* string/argz-next.c: Likewise.
* sysdeps/mach/hurd/sigprocmask.c: Pass sigcode arg to msg_sig_post.
* sysdeps/mach/hurd/i386/sigreturn.c: Likewise.
* sysdeps/mach/hurd/sigsuspend.c: Likewise.
* sysdeps/mach/hurd/kill.c: Likewise.
* hurd/hurdexec.c (_hurd_exec): Use new critical section lock.
* hurd/catch-exc.c (_S_catch_exception_raise): Likewise.
* hurd/sigunwind.c (_hurdsig_longjmp_from_handler): Likewise.
* hurd/thread-cancel.c (hurd_thread_cancel, hurd_check_cancel):
Likewise.
* sysdeps/mach/hurd/jmp-unwind.c (_longjmp_unwind): Likewise.
* sysdeps/mach/hurd/sigaction.c: Likewise.
* sysdeps/mach/hurd/errnos.awk: Don't use ARGV in comment; it can
change meaninglessly.
* hurd/hurd/signal.h (struct hurd_sigstate): Replace critical section
flag with a spin lock.
(_hurd_critical_section_lock): Use spin_try_lock on that to see if we
get it. No need to take SS->lock at all.
(_hurd_critical_section_unlock): Unlock SS->critical_section_lock
instead of clearing the old flag member.
* hurd/hurdsig.c (_hurd_internal_post_signal): Use spin_lock_locked to
test the critical section state.
* hurd/hurdinit.c (_hurd_init): Set _hurdsig_traced from the intarray.
* hurd/hurdkill.c (_hurd_sig_post): Pass 0 sigcode in msg_sig_post.
* hurd/hurdsig.c (_hurd_internal_post_signal): Test _hurdsig_traced
instead of testing (_hurd_exec_flags & EXEC_TRACED).
(_S_msg_sig_post): Take sigcode arg and pass it through.
(_S_msg_sig_post_untraced): Likewise.
(reauth_proc): Don't pass proc port in auth_user_authenticate.
* hurd/setauth.c (_hurd_setauth): Don't pass object ports in
auth_user_authenticate RPCs, just the one-off rendezvous port.
* hurd/dtable.c (reauth_dtable): Likewise.
* hurd/hurdlookup.c (__hurd_file_name_lookup_retry): Likewise.
* hurd/hurdexec.c (_hurd_exec): Pass 0 flags to file_exec.
Pass sigcode arg to msg_sig_post.
* string/argz.h (argz_create): Use const in prototype.
* hurd/hurdinit.c (_hurd_proc_init): Test _hurdsig_traced instead of
testing (_hurd_exec_flags & EXEC_TRACED).
Pass sigcode arg to msg_sig_post.
* hurd/hurd.h: Declare _hurdsig_traced.
* string/argz.h (__argz_next): Cast ENTRY before returning it.
* hurd/hurd/signal.h (_hurd_critical_section_unlock): Pass sigcode arg
to msg_sig_post.
* hurd/path-lookup.c: New file.
* hurd/Makefile (routines): Add path-lookup.
* hurd/hurd/lookup.h: Declare file_name_path_scan,
hurd_file_name_path_lookup.
* hurd/hurd.h: Declare file_name_path_lookup.
* sysdeps/mach/hurd/select.c: The io_select rpc no longer has a TAG_ID
argument. Instead, use a separate reply port for each RPC and put them
all in a port set to wait for slow replies.
* time/strftime.c: Use canonical autoconf nugget for time.h+sys/time.h
include.
Mon Apr 29 02:48:26 1996 Ulrich Drepper <drepper@cygnus.com>
* ctype/ctype-info.c: (__ctype_width): New variable.
(__ctype_names): Initialize correctly without offset.
* locale/C-collate.c, locale/C-ctype.c,
locale/C-messages.c, locale/C-monetary.c,
locale/C-numeric.c, locale/C-time.c: Change copyright.
* locale/C-ctype.c (_nl_C_LC_CTYPE_class32): Correct
endianess for initialization value.
* locale/lc-ctype.c (current): Add parameter for offset.
(__ctype32_b, __ctype_width): Add initialization for these
variables.
* locale/programs/charmap.c: Finish support for WIDTH information.
(new_width): New function.
* locale/programs/charset.h (width_rule): new data structure.
(charset_t): Add elements for width information.
* locale/programs/ld-ctype.c (locale_ctype_t): Add element
for width information.
(allocate_arrays): Add new argument for charset.
(ctype_finish): Make sure all characters named in charset
width table are known to name table.
(ctype_output): Correct handling of class and map name
information and write out width information.
(find_idx): Prepare for being called with NULL pointer as
TABLE argument. This means only allocate name entry.
(allocate_arrays): Correct handling of array element -1.
Because EOF == -1 the value of element 127 must *not* be
mirrored here.
Fill width information from charset tables.
* locale/programs/localedef.c (main): Correct loop over all
categories after change of order from Thu Mar 28 14:22:51 1996.
Add new charset argument to call of `write_all_categories'.
* locale/programs/locales.h (ctype_finish, ctype_output): New
charset argument.
* locale/programs/locfile.c (write_all_categories): Call
`ctype_output' with additional argument charset.
* posix/getconf.c (vars): Add _POSIX_SYNC_IO, _POSIX_ASYNC_IO,
and _POSIX_PRIO_IO definitions.
* posix/posix2_lim.h: Add definition of _POSIX2_CHARCLASS_NAME_MAX
and CHARCLASS_NAME_MAX.
* posix/unistd.h: Document _POSIX_SYNC_IO, _POSIX_ASYNC_IO,
and _POSIX_PRIO_IO.
* stdlib/grouping.h: Prepare for use in wide string functions.
* stdlib/stdlib.h: Correct prototypes for __strto*_internal
functions.
* stdlib/strtod.c: Extend for use as `wcsto{f,d,ld}'.
* stdlib/strtol.c: Extend for use as `wcsto{l,ul,q,uq}'.
* string/strcoll.c: Extend for use as `wcscoll'.
* string/strxfrm.c: Extend for use as `wcsxfrm'.
* sysdeps/generic/confname.h: Add definition of _PC_SYNC_IO,
_PC_ASYNC_IO, _PC_PRIO_IO and _SC_CHARCLASS_NAME_MAX.
* sysdeps/generic/stpncpy.c: Correct return value.
* sysdeps/posix/fpathconf.c: Add handling of _PC_SYNC_IO,
_PC_ASYNC_IO, and _PC_PRIO_IO.
* sysdeps/posix/sysconf.c: Add handling of _SC_REALTIME_SIGNALS,
_SC_PRIORITY_SCHEDULING, _SC_TIMERS, _SC_ASYNCHRONOUS_IO,
_SC_PRIORITIZED_IO, _SC_SYNCHRONIZED_IO, _SC_FSYNC,
_SC_MAPPED_FILES, _SC_MEMLOCK, _SC_MEMLOCK_RANGE,
_SC_MEMORY_PROTECTION, _SC_MESSAGE_PASSING, _SC_SEMAPHORES,
_SC_SHARED_MEMORY_OBJECTS, and _SC_CHARCLASS_NAME_MAX.
* sysdeps/stub/sysconf.c: Ditto.
* sysdeps/unix/sysv/sysv4/sysconf.c: Ditto.
* sysdeps/unix/sysv/linux/Dist: Add sys/sysctl.h.
* sysdeps/unix/sysv/linux/Makefile [subdir == misc]
(sysdep_routines): Add s_sysctl and sysctl.
* sysdeps/unix/sysv/linux/sys/mman.h: Add declaration of mremap.
* sysdeps/unix/sysv/linux/sys/socket.h: New file. Wrapper
around kernel header.
* sysdeps/unix/sysv/linux/sys/sysctl.h: New file. Define
interface to `sysctl' function.
* sysdeps/unix/sysv/linux/syscalls.list: Add mremap and _sysctl.
* sysdeps/unix/sysv/linux/sysconf.c: Add handling of
_SC_CHARCLASS_NAME_MAX.
* sysdeps/unix/sysv/linux/sysctl.c: new file. Implement caller
of _sysctl system call.
* sysvipc/Makefile (routines): Add ftok.
* sysvipc/ftok.c: use variable `proj_id' not `id'. Patch by
David Mosberger-Tang.
* wcsmbs/Makefile (routines): Add wcpcpy, wcpncpy, wcstol,
wcstoul, wcstoq, wcstouq, wcstod, wcstold, wcstof, wcscoll,
wcsxfrm, wcwidth, and wcswidth.
* wcsmbs/wchar.h: Add declarations for wcpcpy, wcpncpy, wcstol,
wcstoul, wcstoq, wcstouq, wcstod, wcstold, wcstof, wcscoll,
wcsxfrm, wcwidth, and wcswidth.
Declare internal interfaces for wcsto* functions.
[OPTIMIZE]: Define inline functions for wcsto* functions to
call internal interface functions.
* wcsmbs/wcpcpy.c, wcsmbs/wcpncpy.c: New files. Implement non-
standard function equivalent to stpcpy/stpncpy.
* wcsmbs/wcscoll.c: Implement `wcscoll' function by using
`strcoll' implementation.
* wcsmbs/wcscpy.c, wcsmbs/wcsncpy.c: Use wint_t instead of
wchar_t.
* wcsmbs/wcstod.c: Implement `wcstod' function by using `strtod'
implementation.
* wcsmbs/wcstof.c: Same for `wcstof'.
* wcsmbs/wcstold.c: Same for `strtold'.
* wcsmbs/wcstol.c: Implement `wcstol' function by using `strtol'
implementation.
* wcsmbs/wcstoq.c: Same for `wcstoq'.
* wcsmbs/wcstoul.c: Same for `wcstoul'.
* wcsmbs/wcstouq.c: Same for `wcstouq'.
* wcsmbs/wcswidth.c: Implement `wcswidth' function from X/Open
CAE.
* wcsmbs/wcwidth.c: Ditto for `wcwidth'.
* wcsmbs/wcwidth.h: Common function for definitions of above two
functions.
* wcsmbs/wcsxfrm.c: Implement `wcsxfrm function by using
`strxfrm implementation.
* wctype/wctype.c: Remove case for `wctype_t' being 16 bit type.
* wctype/wctype.h (wint_t): Protect against multiple definition.
(wctype_t): Always define as `unsigned long int'.
* wctype.h: New file. Wrapper around wctype/wctype.h.
* hurd/hurdstartup.c (_hurd_split_args): Function removed.
(_hurd_startup): Use argz functions.
* hurd/hurdexec.c: Use argz functions.
* hurd/hurdsig.c (_hurd_internal_post_signal): For SIGNO == 0,
skip straight to pending check. When UNTRACED, resume process
from suspension first.
* intl/Makefile (headers): New variable, libintl.h.
[gettext-srcdir]: New rules to copy source from $(gettext-srcdir)/intl.
* configure.in: Check for --with-gettext arg.
Fri Nov 10 13:51:30 1995 Richard Stallman <rms@gnu.ai.mit.edu>
* malloc/malloc.c (get_contiguous_space): New function.
(morecore): Rewrite allocating new malloc info table.
(_malloc_internal): Use get_contiguous_space.
Fri Nov 10 13:03:40 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* hurd/hurdexec.c (_hurd_exec): If exec'ing self, pass
_hurd_msgport to be destroyed.
* Makerules (installed-libcs): Filter out %_pic.a.
* hurd/hurdinit.c (_hurd_proc_init): When traced, use msg_sig_post
to our msgport to take SIGTRAP, instead of _hurd_raise_signal.
* hurd/Makefile (user-interfaces): Add hurd/process_request.
* sysdeps/mach/hurd/getcwd.c: Use __file_name_lookup_under.
* sysdeps/mach/hurd/bind.c: Likewise.
* sysdeps/mach/hurd/access.c: Use new __hurd_file_name_lookup
calling convention.
* hurd/hurdexec.c: Undo last change (10 Oct 95).
* stdio/vfscanf.c (%n): Use READ_IN - 1, so as not to count the
read-ahead character.
* hurd/dtable.c, hurd/getdport.c, hurd/hurd.h, hurd/hurdexec.c,
hurd/hurdinit.c, hurd/hurdprio.c, hurd/hurdsock.c,
hurd/ports-get.c, hurd/ports-set.c, hurd/setauth.c,
hurd/setuids.c, sysdeps/mach/hurd/i386/trampoline.c:
Get anal with unsigned to pacify compiler.
