1 /* Copyright (C) 1992-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <signal.h> 20 #include <hurd.h> 21 22 /* Run signals handlers on the stack specified by SS (if not NULL). 23 If OSS is not NULL, it is filled in with the old signal stack status. */ 24 int sigstack(struct sigstack * ss,struct sigstack * oss)25sigstack (struct sigstack *ss, struct sigstack *oss) 26 { 27 stack_t as, oas; 28 29 as.ss_sp = ss->ss_sp; 30 as.ss_size = 0; 31 as.ss_flags = 0; 32 33 if (__sigaltstack (&as, &oas) < 0) 34 return -1; 35 36 if (oss != NULL) 37 { 38 oss->ss_sp = oas.ss_sp; 39 oss->ss_onstack = oas.ss_flags & SS_ONSTACK; 40 } 41 42 return 0; 43 } 44