glibc/hurd/sigunwind.c
Roland McGrath 8f0c527e13 Sat May 4 05:44:25 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* 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.
1996-05-04 09:46:57 +00:00

141 lines
5.4 KiB
C

/* longjmp cleanup function for unwinding past signal handlers.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <hurd.h>
#include "thread_state.h"
#include <setjmp.h>
#include <assert.h>
/* _hurd_setup_sighandler puts a link on the `active resources' chain so that
_longjmp_unwind will call this function with the `struct sigcontext *'
describing the context interrupted by the signal, when `longjmp' is jumping
to an environment that unwinds past the interrupted frame. */
void
_hurdsig_longjmp_from_handler (void *data, jmp_buf env, int val)
{
struct sigcontext *scp = data;
struct hurd_sigstate *ss = _hurd_self_sigstate ();
int onstack;
inline void cleanup (void)
{
/* Destroy the MiG reply port used by the signal handler, and restore
the reply port in use by the thread when interrupted. */
mach_port_t *reply_port =
(mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY);
if (*reply_port)
{
mach_port_t port = *reply_port;
/* Assigning MACH_PORT_DEAD here tells libc's mig_get_reply_port
not to get another reply port, but avoids mig_dealloc_reply_port
trying to deallocate it after the receive fails (which it will,
because the reply port will be bogus, regardless). */
*reply_port = MACH_PORT_DEAD;
__mach_port_destroy (__mach_task_self (), port);
}
*reply_port = scp->sc_reply_port;
}
__spin_lock (&ss->lock);
/* We should only ever be called from _longjmp_unwind (in jmp-unwind.c),
which calls us inside a critical section. */
assert (__spin_lock_locked (&ss->critical_section_lock));
/* Are we on the alternate signal stack now? */
onstack = (ss->sigaltstack.ss_flags & SA_ONSTACK);
__spin_unlock (&ss->lock);
if (onstack && ! scp->sc_onstack)
{
/* We are unwinding off the signal stack. We must use sigreturn to
do it robustly. Mutate the sigcontext so that when sigreturn
resumes from that context, it will be as if `__longjmp (ENV, VAL)'
were done. */
struct hurd_userlink *link;
/* Continue _longjmp_unwind's job of running the unwind
forms for frames being unwound, since we will not
return to its loop like this one, which called us. */
for (link = ss->active_resources;
link && _JMPBUF_UNWINDS (env[0].__jmpbuf, link);
link = link->thread.next)
if (_hurd_userlink_unlink (link))
{
if (link->cleanup == &_hurdsig_longjmp_from_handler)
{
/* We are unwinding past another signal handler invocation.
Just finish the cleanup for this (inner) one, and then
swap SCP to restore to the outer context. */
cleanup ();
scp = link->cleanup_data;
}
else
(*link->cleanup) (link->cleanup_data, env, val);
}
#define sc_machine_thread_state paste(sc_,machine_thread_state)
#define paste(a,b) paste1(a,b)
#define paste1(a,b) a##b
/* There are no more unwind forms to be run!
Now we can just have the sigreturn do the longjmp for us. */
_hurd_longjmp_thread_state
((struct machine_thread_state *) &scp->sc_machine_thread_state,
env, val);
/* Restore to the same current signal mask. If sigsetjmp saved the
mask, longjmp has already restored it as desired; if not, we
should leave it as it is. */
scp->sc_mask = ss->blocked;
/* sigreturn expects the link added by _hurd_setup_sighandler
to still be there, but _longjmp_unwind removed it just before
calling us. Put it back now so sigreturn can find it. */
link = (void *) &scp[1];
assert (! link->resource.next && ! link->resource.prevp);
assert (link->thread.next == ss->active_resources);
assert (link->thread.prevp = &ss->active_resources);
if (link->thread.next)
link->thread.next->thread.prevp = &link->thread.next;
ss->active_resources = link;
/* We must momentarily exit the critical section so that sigreturn
does not get upset with us. But we don't want signal handlers
running right now, because we are presently in the bogus state of
having run all the unwind forms back to ENV's frame, but our SP is
still inside those unwound frames. */
__spin_lock (&ss->lock);
__spin_unlock (&ss->critical_section_lock);
ss->blocked = ~(sigset_t) 0 & ~_SIG_CANT_MASK;
__spin_unlock (&ss->lock);
/* Restore to the modified signal context that now
performs `longjmp (ENV, VAL)'. */
__sigreturn (scp);
assert (! "sigreturn returned!");
}
/* We are not unwinding off the alternate signal stack. So nothing
really funny is going on here. We can just clean up this handler
frame and let _longjmp_unwind continue unwinding. */
cleanup ();
ss->intr_port = scp->sc_intr_port;
}