forked from acouzens/open5gs
470 lines
12 KiB
C
470 lines
12 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "core-config-private.h"
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#include "ogs-core.h"
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#if HAVE_SIGACTION
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#if defined(__NetBSD__) || defined(DARWIN)
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static void avoid_zombies(int signo)
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{
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int exit_status;
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while (waitpid(-1, &exit_status, WNOHANG) > 0) {
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/* do nothing */
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}
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}
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#endif /* DARWIN */
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/*
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* Replace standard signal() with the more reliable sigaction equivalent
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* from W. Richard Stevens' "Advanced Programming in the UNIX Environment"
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* (the version that does not automatically restart system calls).
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*/
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ogs_sigfunc_t *ogs_signal(int signo, ogs_sigfunc_t *func)
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{
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struct sigaction act, oact;
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act.sa_handler = func;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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#ifdef SA_INTERRUPT /* SunOS */
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act.sa_flags |= SA_INTERRUPT;
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#endif
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#if defined(__osf__) && defined(__alpha)
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/* XXX jeff thinks this should be enabled whenever SA_NOCLDWAIT is defined */
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/* this is required on Tru64 to cause child processes to
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* disappear gracefully - XPG4 compatible
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*/
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if ((signo == SIGCHLD) && (func == SIG_IGN)) {
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act.sa_flags |= SA_NOCLDWAIT;
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}
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#endif
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#if defined(__NetBSD__) || defined(DARWIN)
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/* ignoring SIGCHLD or leaving the default disposition doesn't avoid zombies,
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* and there is no SA_NOCLDWAIT flag, so catch the signal and reap status in
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* the handler to avoid zombies
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*/
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if ((signo == SIGCHLD) && (func == SIG_IGN)) {
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act.sa_handler = avoid_zombies;
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}
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#endif
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if (sigaction(signo, &act, &oact) < 0)
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return SIG_ERR;
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return oact.sa_handler;
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}
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#endif /* HAVE_SIGACTION */
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/* AC_DECL_SYS_SIGLIST defines either of these symbols depending
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* on the version of autoconf used. */
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#if HAVE_DECL_SYS_SIGLIST
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void ogs_signal_init(void)
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{
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}
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const char *ogs_signal_description_get(int signum)
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{
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return (signum >= 0) ? sys_siglist[signum] : "unknown signal (number)";
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}
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#else /* !(SYS_SIGLIST_DECLARED || HAVE_DECL_SYS_SIGLIST) */
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/* we need to roll our own signal description stuff */
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#if defined(NSIG)
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#define OGS_NUMSIG NSIG
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#elif defined(_NSIG)
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#define OGS_NUMSIG _NSIG
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#elif defined(__NSIG)
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#define OGS_NUMSIG __NSIG
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#else
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#define OGS_NUMSIG 33 /* breaks on OS/390 with < 33; 32 is o.k. for most */
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#endif
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static const char *signal_description[OGS_NUMSIG];
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#define store_desc(index, string) \
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do { \
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if (index >= OGS_NUMSIG) { \
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ogs_assert(index < OGS_NUMSIG); \
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} \
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else { \
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signal_description[index] = string; \
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} \
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} while (0)
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void ogs_signal_init(void)
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{
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int sig;
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store_desc(0, "Signal 0");
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#ifdef SIGHUP
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store_desc(SIGHUP, "Hangup");
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#endif
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#ifdef SIGINT
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store_desc(SIGINT, "Interrupt");
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#endif
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#ifdef SIGQUIT
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store_desc(SIGQUIT, "Quit");
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#endif
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#ifdef SIGILL
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store_desc(SIGILL, "Illegal instruction");
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#endif
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#ifdef SIGTRAP
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store_desc(SIGTRAP, "Trace/BPT trap");
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#endif
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#ifdef SIGIOT
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store_desc(SIGIOT, "IOT instruction");
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#endif
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#ifdef SIGABRT
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store_desc(SIGABRT, "Abort");
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#endif
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#ifdef SIGEMT
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store_desc(SIGEMT, "Emulator trap");
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#endif
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#ifdef SIGFPE
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store_desc(SIGFPE, "Arithmetic exception");
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#endif
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#ifdef SIGKILL
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store_desc(SIGKILL, "Killed");
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#endif
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#ifdef SIGBUS
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store_desc(SIGBUS, "Bus error");
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#endif
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#ifdef SIGSEGV
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store_desc(SIGSEGV, "Segmentation fault");
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#endif
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#ifdef SIGSYS
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store_desc(SIGSYS, "Bad system call");
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#endif
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#ifdef SIGPIPE
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store_desc(SIGPIPE, "Broken pipe");
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#endif
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#ifdef SIGALRM
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store_desc(SIGALRM, "Alarm clock");
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#endif
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#ifdef SIGTERM
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store_desc(SIGTERM, "Terminated");
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#endif
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#ifdef SIGUSR1
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store_desc(SIGUSR1, "User defined signal 1");
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#endif
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#ifdef SIGUSR2
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store_desc(SIGUSR2, "User defined signal 2");
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#endif
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#ifdef SIGCLD
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store_desc(SIGCLD, "Child status change");
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#endif
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#ifdef SIGCHLD
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store_desc(SIGCHLD, "Child status change");
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#endif
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#ifdef SIGPWR
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store_desc(SIGPWR, "Power-fail restart");
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#endif
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#ifdef SIGWINCH
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store_desc(SIGWINCH, "Window changed");
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#endif
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#ifdef SIGURG
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store_desc(SIGURG, "urgent socket condition");
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#endif
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#ifdef SIGPOLL
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store_desc(SIGPOLL, "Pollable event occurred");
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#endif
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#ifdef SIGIO
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store_desc(SIGIO, "socket I/O possible");
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#endif
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#ifdef SIGSTOP
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store_desc(SIGSTOP, "Stopped (signal)");
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#endif
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#ifdef SIGTSTP
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store_desc(SIGTSTP, "Stopped");
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#endif
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#ifdef SIGCONT
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store_desc(SIGCONT, "Continued");
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#endif
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#ifdef SIGTTIN
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store_desc(SIGTTIN, "Stopped (tty input)");
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#endif
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#ifdef SIGTTOU
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store_desc(SIGTTOU, "Stopped (tty output)");
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#endif
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#ifdef SIGVTALRM
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store_desc(SIGVTALRM, "virtual timer expired");
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#endif
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#ifdef SIGPROF
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store_desc(SIGPROF, "profiling timer expired");
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#endif
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#ifdef SIGXCPU
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store_desc(SIGXCPU, "exceeded cpu limit");
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#endif
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#ifdef SIGXFSZ
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store_desc(SIGXFSZ, "exceeded file size limit");
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#endif
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for (sig = 0; sig < OGS_NUMSIG; ++sig)
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if (signal_description[sig] == NULL)
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signal_description[sig] = "unknown signal (number)";
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}
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const char *ogs_signal_description_get(int signum)
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{
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return (signum >= 0 && signum < OGS_NUMSIG)
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? signal_description[signum]
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: "unknown signal (number)";
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}
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#endif /* HAVE_DECL_SYS_SIGLIST */
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#if (HAVE_SIGSUSPEND || HAVE_SIGWAIT)
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static void remove_sync_sigs(sigset_t *sig_mask)
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{
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#ifdef SIGABRT
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sigdelset(sig_mask, SIGABRT);
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#endif
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#ifdef SIGBUS
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sigdelset(sig_mask, SIGBUS);
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#endif
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#ifdef SIGEMT
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sigdelset(sig_mask, SIGEMT);
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#endif
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#ifdef SIGFPE
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sigdelset(sig_mask, SIGFPE);
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#endif
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#ifdef SIGILL
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sigdelset(sig_mask, SIGILL);
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#endif
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#ifdef SIGIOT
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sigdelset(sig_mask, SIGIOT);
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#endif
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#ifdef SIGPIPE
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sigdelset(sig_mask, SIGPIPE);
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#endif
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#ifdef SIGSEGV
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sigdelset(sig_mask, SIGSEGV);
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#endif
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#ifdef SIGSYS
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sigdelset(sig_mask, SIGSYS);
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#endif
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#ifdef SIGTRAP
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sigdelset(sig_mask, SIGTRAP);
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#endif
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/* the rest of the signals removed from the mask in this function
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* absolutely must be removed; you cannot block synchronous signals
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* (requirement of pthreads API)
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*/
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}
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int ogs_signal_thread(int(*signal_handler)(int signum))
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{
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sigset_t sig_mask;
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#if HAVE_SIGWAIT
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int (*sig_func)(int signum) = (int (*)(int))signal_handler;
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#endif
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/* This thread will be the one responsible for handling signals */
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sigfillset(&sig_mask);
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/* On certain platforms, sigwait() returns EINVAL if any of various
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* unblockable signals are included in the mask. This was first
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* observed on AIX and Tru64.
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*/
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#ifdef SIGKILL
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sigdelset(&sig_mask, SIGKILL);
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#endif
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#ifdef SIGSTOP
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sigdelset(&sig_mask, SIGSTOP);
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#endif
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#ifdef SIGCONT
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sigdelset(&sig_mask, SIGCONT);
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#endif
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#ifdef SIGWAITING
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sigdelset(&sig_mask, SIGWAITING);
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#endif
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/* no synchronous signals should be in the mask passed to sigwait() */
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remove_sync_sigs(&sig_mask);
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/* On AIX (4.3.3, at least), sigwait() won't wake up if the high-
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* order bit of the second word of flags is turned on. sigdelset()
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* returns an error when trying to turn this off, so we'll turn it
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* off manually.
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*
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* Note that the private fields differ between 32-bit and 64-bit
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* and even between _ALL_SOURCE and !_ALL_SOURCE. Except that on
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* AIX 4.3 32-bit builds and 64-bit builds use the same definition.
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*
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* Applicable AIX fixes such that this is no longer needed:
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*
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* APAR IY23096 for AIX 51B, fix included in AIX 51C, and
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* APAR IY24162 for 43X.
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*/
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#if defined(_AIX)
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#if defined(__64BIT__) && defined(_AIXVERSION_510)
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#ifdef _ALL_SOURCE
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sig_mask.ss_set[3] &= 0x7FFFFFFF;
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#else /* not _ALL_SOURCE */
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sig_mask.__ss_set[3] &= 0x7FFFFFFF;
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#endif
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#else /* not 64-bit build, or 64-bit build on 4.3 */
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#ifdef _ALL_SOURCE
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sig_mask.hisigs &= 0x7FFFFFFF;
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#else /* not _ALL_SOURCE */
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sig_mask.__hisigs &= 0x7FFFFFFF;
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#endif
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#endif
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#endif /* _AIX */
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while (1) {
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#if HAVE_SIGWAIT
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int signal_received;
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if (sigwait(&sig_mask, &signal_received) != 0)
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{
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/* handle sigwait() error here */
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}
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if (sig_func(signal_received) == 1) {
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return OGS_OK;
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}
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#elif HAVE_SIGSUSPEND
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sigsuspend(&sig_mask);
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#else
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#error No sigwait() and no sigsuspend()
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#endif
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}
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}
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int ogs_setup_signal_thread(void)
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{
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sigset_t sig_mask;
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int rv;
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/* All threads should mask out signals to be handled by
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* the thread doing sigwait().
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*
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* No thread should ever block synchronous signals.
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* See the Solaris man page for pthread_sigmask() for
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* some information. Solaris chooses to knock out such
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* processes when a blocked synchronous signal is
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* delivered, skipping any registered signal handler.
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* AIX doesn't call a signal handler either. At least
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* one level of linux+glibc does call the handler even
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* when the synchronous signal is blocked.
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*/
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sigfillset(&sig_mask);
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remove_sync_sigs(&sig_mask);
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#if defined(SIGPROCMASK_SETS_THREAD_MASK)
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if ((rv = sigprocmask(SIG_SETMASK, &sig_mask, NULL)) != 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "sigprocmask() failed");
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return OGS_ERROR;
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}
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#else
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if ((rv = pthread_sigmask(SIG_SETMASK, &sig_mask, NULL)) != 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "pthread_sigmask() failed");
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return OGS_ERROR;
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}
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#endif
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return rv;
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}
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#endif
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int ogs_signal_block(int signum)
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{
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#if HAVE_SIGACTION
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sigset_t sig_mask;
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int rv;
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sigemptyset(&sig_mask);
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sigaddset(&sig_mask, signum);
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#if defined(SIGPROCMASK_SETS_THREAD_MASK)
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if ((rv = sigprocmask(SIG_BLOCK, &sig_mask, NULL)) != 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "pthread_sigmask() failed");
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return OGS_ERROR;
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}
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#else
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if ((rv = pthread_sigmask(SIG_BLOCK, &sig_mask, NULL)) != 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "pthread_sigmask() failed");
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return OGS_ERROR;
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}
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#endif
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return OGS_OK;
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#else
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ogs_assert_if_reached();
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return OGS_ERROR;
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#endif
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}
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int ogs_signal_unblock(int signum)
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{
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#if HAVE_SIGACTION
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sigset_t sig_mask;
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int rv;
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sigemptyset(&sig_mask);
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sigaddset(&sig_mask, signum);
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#if defined(SIGPROCMASK_SETS_THREAD_MASK) || ! OGS_HAS_THREADS
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if ((rv = sigprocmask(SIG_UNBLOCK, &sig_mask, NULL)) != 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "pthread_sigmask() failed");
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return OGS_ERROR;
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}
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#else
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if ((rv = pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL)) != 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "pthread_sigmask() failed");
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return OGS_ERROR;
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}
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#endif
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return OGS_OK;
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#else
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ogs_assert_if_reached();
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return OGS_ERROR;
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#endif
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}
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