124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/*********************************************************
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* Copyright (C) 1998-2015 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation version 2.1 and no later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*********************************************************/
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/*
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* vmsignal.c --
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*
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* Posix signal handling utility functions
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*
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*/
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#ifndef VMX86_DEVEL
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include "vmsignal.h"
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/*
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* Signal_SetGroupHandler --
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*
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* Set a signal handler for a group of signals.
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* We carefully ensure that if the handler is only used to handle the
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* signals of the group, the handling of all the signals of the group is
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* serialized, which means that the handler is not re-entrant.
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*
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* Return value:
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* 1 on success
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* 0 on failure (detail is displayed)
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*
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* Side effects:
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* None
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*
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*/
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int
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Signal_SetGroupHandler(int const *signals, // IN
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struct sigaction *olds, // OUT
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unsigned int nr, // IN
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void (*handler)(int signal)) // IN
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{
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unsigned int i;
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struct sigaction new;
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new.sa_handler = handler;
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if (sigemptyset(&new.sa_mask)) {
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fprintf(stderr, "Unable to empty a signal set: %s.\n\n", strerror(errno));
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return 0;
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}
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for (i = 0; i < nr; i++) {
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if (sigaddset(&new.sa_mask, signals[i])) {
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fprintf(stderr, "Unable to add a signal to a signal set: %s.\n\n", strerror(errno));
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return 0;
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}
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}
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new.sa_flags = 0;
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for (i = 0; i < nr; i++) {
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if (sigaction(signals[i], &new, &olds[i])) {
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fprintf(stderr, "Unable to modify the handler of the signal %d: %s.\n\n", signals[i], strerror(errno));
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return 0;
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}
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}
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return 1;
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}
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/*
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* Signal_ResetGroupHandler --
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*
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* Reset the handler of each signal of a group of signals
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*
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* Return value:
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* 1 on success
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* 0 on failure (detail is displayed)
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*
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* Side effects:
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* None
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*
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*/
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int
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Signal_ResetGroupHandler(int const *signals, // IN
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struct sigaction const *olds, // IN
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unsigned int nr) // IN
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{
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unsigned int i;
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for (i = 0; i < nr; i++) {
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if (sigaction(signals[i], &olds[i], NULL)) {
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fprintf(stderr, "Unable to reset the handler of the signal %d: %s.\n\n", signals[i], strerror(errno));
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return 0;
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}
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}
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return 1;
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}
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