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/*********************************************************
* Copyright (C) 1998-2015 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* This program 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* vmsignal.c --
*
* Posix signal handling utility functions
*
*/
#ifndef VMX86_DEVEL
#endif
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "vmsignal.h"
/*
* Signal_SetGroupHandler --
*
* Set a signal handler for a group of signals.
* We carefully ensure that if the handler is only used to handle the
* signals of the group, the handling of all the signals of the group is
* serialized, which means that the handler is not re-entrant.
*
* Return value:
* 1 on success
* 0 on failure (detail is displayed)
*
* Side effects:
* None
*
*/
int
Signal_SetGroupHandler(int const *signals, // IN
struct sigaction *olds, // OUT
unsigned int nr, // IN
void (*handler)(int signal)) // IN
{
unsigned int i;
struct sigaction new;
new.sa_handler = handler;
if (sigemptyset(&new.sa_mask)) {
fprintf(stderr, "Unable to empty a signal set: %s.\n\n", strerror(errno));
return 0;
}
for (i = 0; i < nr; i++) {
if (sigaddset(&new.sa_mask, signals[i])) {
fprintf(stderr, "Unable to add a signal to a signal set: %s.\n\n", strerror(errno));
return 0;
}
}
new.sa_flags = 0;
for (i = 0; i < nr; i++) {
if (sigaction(signals[i], &new, &olds[i])) {
fprintf(stderr, "Unable to modify the handler of the signal %d: %s.\n\n", signals[i], strerror(errno));
return 0;
}
}
return 1;
}
/*
* Signal_ResetGroupHandler --
*
* Reset the handler of each signal of a group of signals
*
* Return value:
* 1 on success
* 0 on failure (detail is displayed)
*
* Side effects:
* None
*
*/
int
Signal_ResetGroupHandler(int const *signals, // IN
struct sigaction const *olds, // IN
unsigned int nr) // IN
{
unsigned int i;
for (i = 0; i < nr; i++) {
if (sigaction(signals[i], &olds[i], NULL)) {
fprintf(stderr, "Unable to reset the handler of the signal %d: %s.\n\n", signals[i], strerror(errno));
return 0;
}
}
return 1;
}
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