/*
* Module: signal_parent.c
*
* Description: Example program used to demonstrate OProfile
*
* Copyright (C) 2010 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 <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#define BUF_SIZE (4096*256)
volatile static int signal_parent = 0;
void mysig(int sig)
{
int status;
pid_t pid;
printf("Signal %d \n", sig);
if (sig == SIGALRM)
{
signal_parent = 1;
}
if (sig == SIGCLD)
{
// harvest terminated DEFUNCT child process
pid = waitpid(-1, &status, WNOHANG);
printf(" Child Process(%d) terminated with a status of %d\n",
pid, status);
}
}
/* In main, we tell the child process to wait for ten seconds
before sending a SIGALRM signal to its parent. */
int main()
{
int pid;
int sum;
char * buf;
int i,j;
printf("child process starting\n");
if((pid = fork()) == 0) {
buf = (char *) malloc(BUF_SIZE);
if(buf == NULL)
{
exit(1);
}
for(j=0;j<10;j++)
{
for(i=0;i<BUF_SIZE;i++)
{
buf[i] = i;
sum = (int)buf[i];
}
}
// Child process
sleep(9);
// Wake up parent process with a SIGALRM
free (buf);
kill(getppid(), SIGALRM);
exit(0);
}
/* The parent process arranges to catch SIGALRM with a call to signal
and then waits for the inevitable. */
(void) signal(SIGALRM, mysig);
(void) signal(SIGCLD, mysig);
do
{
#ifdef USE_SIGNALS
printf("Parent blocks and waits for signal from child\n");
pause(); // Wait for any signal call
#endif
} while(!signal_parent);
printf("Got signal from child\n");
printf("done\n");
exit(0);
}