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malloc-sleep-free.c
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malloc-sleep-free.c
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/*
* Copyright 2018 Sandipan Das, IBM Corporation
*
* This will perform memory allocations, go to sleep
* and free up the previous allocations after waking
* up. The allocations that are yet to be free can be
* traced using the bcc memleak script.
*
*/
#include <time.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#define MAX_ALLOCS 5
int main(int argc, char **argv)
{
void *ptr[MAX_ALLOCS];
size_t bytes;
int i, j;
srand(time(NULL));
for (i = 0; i < INT32_MAX; ++i) {
/* Allocate memory */
for (j = 0; j < MAX_ALLOCS; ++j) {
bytes = rand() % (INT16_MAX - 1) + 1;
printf("allocating %lu bytes\n", bytes);
ptr[j] = malloc(bytes);
}
/* Wait for a couple of seconds */
sleep(2);
/* Free memory */
for (j = 0; j < MAX_ALLOCS; ++j) {
printf("freeing %lu bytes\n", bytes);
free(ptr[j]);
}
}
return EXIT_SUCCESS;
}