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glibc  2.9
unwind_longjmp.c
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00001 /* Copyright (C) 1991,92,94,95,97,98,2000,02,04 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stddef.h>
00020 #include <setjmp.h>
00021 #include <signal.h>
00022 #include <pthreadP.h>
00023 #include <jmpbuf-unwind.h>
00024 
00025 extern void __sigstack_longjmp (__jmp_buf, int)
00026      __attribute__ ((noreturn));
00027 
00028 /* Like __libc_siglongjmp(), but safe for crossing from alternate
00029    signal stack to normal stack.  Needed by NPTL.  */
00030 void
00031 __libc_unwind_longjmp (sigjmp_buf env, int val)
00032 {
00033   /* Perform any cleanups needed by the frames being unwound.  */
00034   __pthread_cleanup_upto (env->__jmpbuf, CURRENT_STACK_FRAME);
00035 
00036   if (env[0].__mask_was_saved)
00037     /* Restore the saved signal mask.  */
00038     (void) __sigprocmask (SIG_SETMASK, &env[0].__saved_mask,
00039                        (sigset_t *) NULL);
00040 
00041   /* Call the machine-dependent function to restore machine state.  */
00042   __sigstack_longjmp (env[0].__jmpbuf, val ?: 1);
00043 }
00044 hidden_def (__libc_unwind_longjmp)