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/*
 * ctprof_utility.c
 *
 * Ctools Profiler Utility 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 <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include "ctprof_utility.h"

static char * fifo_filename = "ctprof_fifo";
//static FILE * fp;
static int ctprof_pipe_fd;
static bool fifo_opened = false;

/* State definitions
 * ready - ctprof_srv is ready for a signal
 * recording - ctprof_srv is recording
 * stopped - ctprof_srv has stopped recording
 * Note - all messages are the same size in bytes.
 */
static const char msg_recording[] = "ctprof recording\n";
static const char msg_stopped[] =   "ctprof stopped__\n";
static const char msg_ready[] =     "ctprof ready____\n";
static char readbuf[sizeof(msg_recording)];

/* Note: This implementation uses named pipes for very 
 * simple ipc. This could be changed in the future to
 * use sockets or some other ipc so check the requirements
 * for the version of ctprof you are using 
 */

static pid_t ctprof_srv_pid;

void ctprof_pipe_read(char * rd_buf_p, size_t rd_bytecnt)
{
    while(rd_bytecnt > 0) {
        size_t rc = read(ctprof_pipe_fd, rd_buf_p, rd_bytecnt);
 
        if (( rc == -1) && (errno = EINTR)) {
            continue;
        }

        rd_buf_p += rc;
        rd_bytecnt -= rc;        
    } 
}

int ctprof_pipe_open(void)
{
    /* If fifo can't be opend then return -1 */
    if (!fifo_opened) {
        if (-1 == (ctprof_pipe_fd = open(fifo_filename, O_RDONLY))) {
            return -1;
        }
        fifo_opened = true;     
    }

    ctprof_pipe_read((char *)&ctprof_srv_pid, sizeof(pid_t));
}

void ctprof_pipe_close(void)
{
    if (fifo_opened) {
        close(ctprof_pipe_fd);
        fifo_opened = false;
    }        

}

static pid_t ctprof_get_pid(void) 
{
    if (fifo_opened) {
        return ctprof_srv_pid;
    } else {
        return -1;
    }
}

ctprof_state_t ctprof_get_state(void)
{
    /* If the fifo opened sucessfully, then fgets should block
     * until data is avaiable.
     */
    if (fifo_opened) {
        ctprof_pipe_read(readbuf, sizeof(readbuf)-1);

        if (0 == strcmp(readbuf, msg_recording)) {
            return CTPROF_RECORDING;
        }
        if (0 == strcmp(readbuf, msg_stopped)) {
            return CTPROF_STOPPED;
        }
        if (0 == strcmp(readbuf, msg_ready)) {
            return CTPROF_READY;
        }
    }

    return -1;

}

void ctprof_ready_wait()
{
    ctprof_state_t ctprof_state;

    do {

        ctprof_state = ctprof_get_state();

        if(ctprof_state == CTPROF_READY) {
            break;
        }

    } while (1);
}

void ctprof_recording_wait()
{
    ctprof_state_t ctprof_state;

    do {

        ctprof_state = ctprof_get_state();

        if(ctprof_state == CTPROF_RECORDING) {
            break;
        }

    } while (1);
}

void ctprof_stopped_wait()
{
    ctprof_state_t ctprof_state;

    do {

        ctprof_state = ctprof_get_state();

        if(ctprof_state == CTPROF_STOPPED) {
            break;
        }

    } while (1);
}

/* Start recording with a signal*/
void ctprof_start_recording()
{
    kill(ctprof_get_pid(), SIGUSR1);
}

/* End recording for this session*/
void ctprof_end_recording()
{
    kill(ctprof_get_pid(), SIGUSR2);
}