test linux virtual memory max size

/**

* $Id: mmap.cpp 1595 2012-07-28 10:33:18Z shijia.wxr $

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <sys/types.h>

 

#define MMAP_FILE_SIZE (1024 * 1024 * 1024)

 

int main ( int argc , char ** argv )

{

int i = 0 ;

 

for ( i = 1 ; ; i ++ ) {

char filePath [ 64 ] = { 0 };

sprintf ( filePath , "%d" , i );

int fd = open ( filePath , O_RDWR | O_CREAT );

if ( fd < 0 ) {

printf ( "open failed \n " );

break ;

}

ftruncate ( fd , MMAP_FILE_SIZE );

 

void * p = mmap ( 0 , MMAP_FILE_SIZE , PROT_WRITE , MAP_SHARED , fd , 0 );

if ( p != 0 ) {

memset ( p , 0 , MMAP_FILE_SIZE );

printf ( "mmap OK, %d \n " , i );

} else {

printf ( "mmap Failed, exit. \n " );

break ;

}

}

 

while ( 1 ) {

printf ( "sleeping \n " );

sleep ( 1 );

}

 

return 0 ;

}