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/*
* signal_handler.c
*
* Ctools Profiler Server Implementation
*
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <signal.h>
#include <unistd.h>
#include "error_handler.h"
#include "logging.h"
#include "ctoolsprof.h"
#include "signal_handler.h"
static recording_op start_recording;
static recording_op stop_recording;
struct sigaction action;
/*****************************************************************************
* Private Functions
*****************************************************************************/
/*****************************************************************************
* signal_handler()
*
* This is a common signal handler for all signals
*
* - If the signal is not expected then generate a fatal error and exit.
* - Handle the signal.
* - If SIGALRM and delay_active true, then start recording.
* - If SIGALRM and duration_active true, then stop recording.
* - If SIGUSR1 and signal_active true, then start recording.
* - If SIGUSR2 and signal_active true, then stop recording.
* - if SIGINT and recording then stop recording.
*
*****************************************************************************/
void signal_handler(int sig) {
LOGFUNC();
LOGMSG1("%s:Caught signal %d", __func__, sig);
/* If the signal is not expected then generate a fatal error and exit. */
if ((global_state.delay_active == false)
&& (global_state.recording == STATE_UNINITIALIZED)) {
LOGMSG1("%s:caught signal %d while in uninitialized state", __func__,
signal);
err_handler(ERR_TYPE_LOCAL, ERR_INVALID_SIGNAL_CAUGHT);
}
/* Handle the signal */
switch (sig) {
case SIGALRM:
if (global_state.delay_active == true) {
LOGMSG1("%s:caught SIGALRM - calling start_recording()", __func__);
global_state.delay_active = false;
global_state.duration_active = true;
sigaction(SIGALRM, &action, NULL);
start_recording();
} else if (global_state.duration_active == true) {
LOGMSG1("%s:caught SIGALRM - calling end_recording()", __func__);
global_state.duration_active = false;
sigaction(SIGALRM, &action, NULL);
stop_recording();
}
break;
case SIGUSR1:
if ((global_state.recording != STATE_RECORDING)
&& (global_state.signal_active == true)) {
LOGMSG1("%s:caught SIGUSR1 - calling start_recording()", __func__);
sigaction(SIGUSR1, &action, NULL);
start_recording();
}
break;
case SIGUSR2:
if ((global_state.recording == STATE_RECORDING)
&& (global_state.signal_active == true)) {
LOGMSG1("%s:caught SIGUSR2 - calling end_recording()", __func__);
sigaction(SIGUSR2, &action, NULL);
stop_recording();
global_state.signal_active = false;
}
break;
case SIGINT:
if (global_state.recording == STATE_RECORDING) {
LOGMSG1("%s:caught SIGINT - calling end_recording()", __func__);
sigaction(SIGINT, &action, NULL);
stop_recording();
}
break;
case SIGPIPE:
/* Client has broken the pipe - so simply stop using it */
LOGMSG1("%s:caught SIGPIP - close the pipe", __func__);
g_fifo_enabled = false;
if (g_fifo_fd != -1) {
close(g_fifo_fd);
g_fifo_fd = -1;
}
break;
default:
LOGMSG1("%s:caught invalid signal %d", __func__, signal);
err_handler(ERR_TYPE_LOCAL, ERR_INVALID_SIGNAL_CAUGHT);
} /* End of switch */
}
/*****************************************************************************
* Public Functions
*****************************************************************************/
/*****************************************************************************
* signal_handler_init()
*
* Initialize the signal handling
*
* Note: This function takes the start_recording and stop_recording functions
* as inputs eliminating the need to include remote_commands.h.
*
*****************************************************************************/
void signal_handler_init(recording_op start_op, recording_op stop_op)
{
LOGFUNC();
sigset_t block_mask;
start_recording = start_op;
stop_recording = stop_op;
memset(&action, 0, sizeof(struct sigaction));
/* Setup signals to be masked while servicing a signal*/
sigemptyset(&block_mask);
sigaddset(&block_mask, SIGALRM);
sigaddset(&block_mask, SIGUSR1);
sigaddset(&block_mask, SIGUSR2);
sigaddset(&block_mask, SIGINT);
action.sa_handler = signal_handler;
action.sa_mask = block_mask;
/*Register signal handlers */
sigaction(SIGALRM, &action, NULL);
sigaction(SIGUSR1, &action, NULL);
sigaction(SIGUSR2, &action, NULL);
sigaction(SIGINT, &action, NULL);
sigaction(SIGPIPE, &action, NULL);
}
/*****************************************************************************
* signal_handler_block()
*
* Sets signals to block.
*
* Note: This function saves the original signal blocking mask in orig_mask.
*
*****************************************************************************/
static sigset_t orig_mask;
static bool signals_blocked = false;
void signal_handler_block()
{
if (signals_blocked == true) {
return;
}
sigset_t block_mask;
sigemptyset(&block_mask);
sigaddset(&block_mask, SIGALRM);
sigaddset(&block_mask, SIGUSR1);
sigaddset(&block_mask, SIGUSR2);
sigaddset(&block_mask, SIGINT);
if (sigprocmask(SIG_BLOCK, &block_mask, &orig_mask) < 0) {
err_handler(ERR_TYPE_LOCAL, ERR_DEBUG);
}
signals_blocked = true;
}
/*****************************************************************************
* signal_handler_unblock()
*
* Restores original signal state prior to blocking.
*
* Note: Do not call this function without calling signal_handler_block() first.
*
*****************************************************************************/
void signal_handler_unblock()
{
if (signals_blocked == false) {
return;
}
if (sigprocmask(SIG_SETMASK, &orig_mask, NULL) < 0) {
err_handler(ERR_TYPE_LOCAL, ERR_DEBUG);
}
signals_blocked = false;
}
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