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/*
* Copyright (c) 2008, 2009, 2011, 2012, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "signals.h"
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "openvswitch/poll-loop.h"
#include "socket-util.h"
#include "openvswitch/type-props.h"
#include "util.h"
#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(signals);
#if defined(_NSIG)
#define N_SIGNALS _NSIG
#elif defined(NSIG)
#define N_SIGNALS NSIG
#else
/* We could try harder to get the maximum signal number, but in practice we
* only care about SIGHUP, which is normally signal 1 anyway. */
#define N_SIGNALS 32
#endif
/* Returns the name of signal 'signum' as a string. The return value is either
* a statically allocated constant string or the 'bufsize'-byte buffer
* 'namebuf'. 'bufsize' should be at least SIGNAL_NAME_BUFSIZE.
*
* The string is probably a (possibly multi-word) description of the signal
* (e.g. "Hangup") instead of just the stringified version of the macro
* (e.g. "SIGHUP"). */
const char *
signal_name(int signum, char *namebuf, size_t bufsize)
{
#if HAVE_DECL_SYS_SIGLIST
if (signum >= 0 && signum < N_SIGNALS) {
const char *name = sys_siglist[signum];
if (name) {
return name;
}
}
#elif HAVE_SIGDESCR_NP
const char *name = sigdescr_np(signum);
if (name) {
return name;
}
#endif
snprintf(namebuf, bufsize, "signal %d", signum);
return namebuf;
}
void
xsigaction(int signum, const struct sigaction *new, struct sigaction *old)
{
if (sigaction(signum, new, old)) {
char namebuf[SIGNAL_NAME_BUFSIZE];
VLOG_FATAL("sigaction(%s) failed (%s)",
signal_name(signum, namebuf, sizeof namebuf),
ovs_strerror(errno));
}
}
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