FreeRDP/libfreerdp/utils/signal.c

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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Signal handling
*
* Copyright 2011 Shea Levy <shea@shealevy.com>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stddef.h>
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#include <errno.h>
#include <winpr/crt.h>
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#include <freerdp/utils/signal.h>
#include <freerdp/log.h>
#define TAG FREERDP_TAG("utils")
#ifdef _WIN32
int freerdp_handle_signals(void)
{
errno = ENOSYS;
return -1;
}
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#else
#include <pthread.h>
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volatile sig_atomic_t terminal_needs_reset = 0;
int terminal_fildes = 0;
struct termios orig_flags;
struct termios new_flags;
static void fatal_handler(int signum)
{
struct sigaction default_sigaction;
sigset_t this_mask;
WLog_DBG(TAG, "fatal_handler: signum=%d", signum);
if (terminal_needs_reset)
tcsetattr(terminal_fildes, TCSAFLUSH, &orig_flags);
default_sigaction.sa_handler = SIG_DFL;
sigfillset(&(default_sigaction.sa_mask));
default_sigaction.sa_flags = 0;
sigaction(signum, &default_sigaction, NULL);
sigemptyset(&this_mask);
sigaddset(&this_mask, signum);
pthread_sigmask(SIG_UNBLOCK, &this_mask, NULL);
raise(signum);
}
const int fatal_signals[] =
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{
SIGABRT,
SIGALRM,
SIGBUS,
SIGFPE,
SIGHUP,
SIGILL,
SIGINT,
SIGKILL,
SIGQUIT,
SIGSEGV,
SIGSTOP,
SIGTERM,
SIGTSTP,
SIGTTIN,
SIGTTOU,
SIGUSR1,
SIGUSR2,
#ifdef SIGPOLL
SIGPOLL,
#endif
#ifdef SIGPROF
SIGPROF,
#endif
#ifdef SIGSYS
SIGSYS,
#endif
SIGTRAP,
#ifdef SIGVTALRM
SIGVTALRM,
#endif
SIGXCPU,
SIGXFSZ
};
int freerdp_handle_signals(void)
{
int signal_index;
sigset_t orig_set;
struct sigaction orig_sigaction;
struct sigaction fatal_sigaction;
WLog_DBG(TAG, "Registering signal hook...");
sigfillset(&(fatal_sigaction.sa_mask));
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sigdelset(&(fatal_sigaction.sa_mask), SIGCONT);
pthread_sigmask(SIG_BLOCK, &(fatal_sigaction.sa_mask), &orig_set);
fatal_sigaction.sa_handler = fatal_handler;
fatal_sigaction.sa_flags = 0;
for (signal_index = 0; signal_index < ARRAYSIZE(fatal_signals); signal_index++)
{
if (sigaction(fatal_signals[signal_index], NULL, &orig_sigaction) == 0)
{
if (orig_sigaction.sa_handler != SIG_IGN)
{
sigaction(fatal_signals[signal_index], &fatal_sigaction, NULL);
}
}
}
pthread_sigmask(SIG_SETMASK, &orig_set, NULL);
/* Ignore SIGPIPE signal. */
signal(SIGPIPE, SIG_IGN);
return 0;
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}
#endif