NAME
       mmap, munmap - map or unmap files or devices into memory

SYNOPSIS
       #include <sys/mman.h>

       void *mmap(void *addr, size_t length, int prot, int flags,
                  int fd, off_t offset);
       int munmap(void *addr, size_t length);

       See NOTES for information on feature test macro requirements.

#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h> 

#include "zlog.h"

typedef unsigned char byte;

zlog_category_t *c;

int app_init_zlog() {	    
	    int rc = zlog_init("zlog.conf");
		if (rc) {
			printf("init failed\n");
			return -1;
		}

		c = zlog_get_category("my_cat");
		if (!c) {
			printf("get cat fail\n");
			zlog_fini();
			return -2;
		}
		return 0;
}


int main(int argc, char **argv, char **env) {
	
		long length = 1024 * 1024;

		if (app_init_zlog()!=0) return -1;
	
		zlog_info(c, ":: Begin");

		int pageSize = getpagesize();

		int fd = open("~/fias_xml.rar", O_RDWR);

		if (fd == -1) {
			zlog_error(c, ":: Error");
			return -1;
		}

		zlog_info(c, ":: pagesize = %d", pageSize);

		zlog_info(c, ":: mmap(...) begin ");

		// void *mmap(void *addr, size_t length, int prot, int flags,int fd, off_t offset);
		// 
		void * p = mmap(0, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

        if (p == MAP_FAILED) {
			zlog_error(c, ":: MAP_FAILED!");
			return -1;
		}

		zlog_info(c, ":: mmap(...) end ");

		for(int i=0; i < 100 ; i++) {
			printf("%02X ", ((byte*)p)[i]);
			if ((i + 1) % 16 == 0) {
				printf("\n");
			}
		}
		printf("\n");

		zlog_info(c, ":: OK!");

		zlog_fini();

		close(fd);


	return 0;
}