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authorRoland McGrath <roland@gnu.org>1995-03-27 10:00:09 +0000
committerRoland McGrath <roland@gnu.org>1995-03-27 10:00:09 +0000
commit1474b80f017c2fcc18b1de5bbc51884650d30582 (patch)
tree1baa3c89ef3802cda051fa7f8f9c9bb8c0bf6abd /sysdeps/mach
parentd365fd2cfa4248fcce18fc60d3d90598aa1f534b (diff)
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Mon Mar 27 02:23:15 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* posix/unistd.h [__USE_BSD] (ttyslot): Declare it. * posix/unistd.h [__USE_BSD] (L_SET, L_INCR, L_XTND): Define unless L_SET already defined. * misc/sys/file.h (L_SET, L_INCR, L_XTND): Don't define if L_SET already defined. Incorporated -lutil library from 4.4-Lite. * misc/Makefile (extra-libs, libutil-routines): New variables. * misc/login.c, misc/login_tty.c, misc/logout.c, misc/logwtmp.c, sysdeps/generic/pty.c: New files for -lutil incorporated from 4.4-Lite. Support simple, light-weight unwind-protect mechanism for longjmp. * setjmp/longjmp.c: Call _longjmp_unwind first thing. * sysdeps/mach/hurd/jmp-unwind.c: New file. * sysdeps/stub/jmp-unwind.c: New file. * sysdeps/i386/jmp_buf.h (_JMPBUF_UNWINDS): New macro. * sysdeps/mips/jmp_buf.h (_JMPBUF_UNWINDS): New macro. * setjmp/Makefile (routines): Add jmp-unwind. * hurd/hurd/userlink.h (struct hurd_userlink): Move `next' and `prevp' members into new substructure `resource'; add another such substructure `thread' and members `cleanup' (function ptr) and `cleanup_data' (generic ptr). (_hurd_userlink_link, _hurd_userlink_unlink): Insert/remove LINK into the `_hurd_self_sigstate ()->active_resources' list via the `thread' substructure. * hurd/hurd/port.h (_hurd_port_cleanup): Declare it. (_hurd_port_locked_get): Set LINK->cleanup to _hurd_port_cleanup and LINK->cleanup_data' to the port extracted. * hurd/hurd/signal.h (struct hurd_sigstate): New member `active_resources'. * hurd/port-cleanup.c: New file. * hurd/Makefile (routines): Add port-cleanup. * malloc/malloc.c: Include errno.h. Sat Mar 25 18:24:21 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * locale/loadlocale.c (_nl_load_locale): Avoid */ inside comment.
Diffstat (limited to 'sysdeps/mach')
-rw-r--r--sysdeps/mach/hurd/jmp-unwind.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/jmp-unwind.c b/sysdeps/mach/hurd/jmp-unwind.c
new file mode 100644
index 0000000000..f7540f0dde
--- /dev/null
+++ b/sysdeps/mach/hurd/jmp-unwind.c
@@ -0,0 +1,62 @@
+/* _longjmp_unwind -- Clean up stack frames unwound by longjmp. Hurd version.
+Copyright (C) 1995 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 <setjmp.h>
+#include <hurd/signal.h>
+#include <hurd/userlink.h>
+#include <assert.h>
+
+/* This function is called by `longjmp' (with its arguments) to restore
+ active resources to a sane state before the frames code using them are
+ jumped out of. */
+
+void
+_longjmp_unwind (jmp_buf env, int val)
+{
+ struct hurd_sigstate *ss = _hurd_self_sigstate ();
+ struct hurd_userlink *link;
+
+ /* All access to SS->active_resources must take place inside a critical
+ section where signal handlers cannot run. */
+ __spin_lock (&ss->lock);
+ assert (! ss->critical_section);
+ ss->critical_section = 1;
+ __spin_unlock (&ss->lock);
+
+#ifndef _JMPBUF_UNWINDS
+ #error "sysdeps/MACHINE/jmp_buf.h fails to define _JMPBUF_UNWINDS"
+#endif
+
+ /* Iterate over the current thread's list of active resources.
+ Process the head portion of the list whose links reside
+ in stack frames being unwound by this jump. */
+
+ for (link = ss->active_resources;
+ link && _JMPBUF_UNWINDS (env[0].__jmpbuf, link);
+ link = link->thread.next)
+ /* Remove this link from the resource's users list,
+ since the frame using the resource is being unwound.
+ This call returns nonzero if that was the last user. */
+ if (_hurd_userlink_unlink (link))
+ /* One of the frames being unwound by the longjmp was the last user
+ of its resource. Call the cleanup function to deallocate it. */
+ (*link->cleanup) (link->cleanup_data, env, val);
+
+ _hurd_critical_section_unlock (ss);
+}