From 1474b80f017c2fcc18b1de5bbc51884650d30582 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Mon, 27 Mar 1995 10:00:09 +0000 Subject: Mon Mar 27 02:23:15 1995 Roland McGrath * 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 * locale/loadlocale.c (_nl_load_locale): Avoid */ inside comment. --- sysdeps/mach/hurd/jmp-unwind.c | 62 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 sysdeps/mach/hurd/jmp-unwind.c (limited to 'sysdeps/mach/hurd/jmp-unwind.c') 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 +#include +#include +#include + +/* 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); +} -- cgit 1.4.1