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glibc  2.9
sigstack.c
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00001 /* Copyright (C) 1992,97,98,2000 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 <errno.h>
00020 #include <signal.h>
00021 #include <hurd.h>
00022 
00023 /* Run signals handlers on the stack specified by SS (if not NULL).
00024    If OSS is not NULL, it is filled in with the old signal stack status.  */
00025 int
00026 sigstack (struct sigstack *ss, struct sigstack *oss)
00027 {
00028   struct sigaltstack as, oas;
00029 
00030   as.ss_sp = ss->ss_sp;
00031   as.ss_size = 0;
00032   as.ss_flags = 0;
00033 
00034   if (__sigaltstack (&as, &oas) < 0)
00035     return -1;
00036 
00037   if (oss != NULL)
00038     {
00039       oss->ss_sp = oas.ss_sp;
00040       oss->ss_onstack = oas.ss_flags & SS_ONSTACK;
00041     }
00042 
00043   return 0;
00044 }