Subversion Repositories c0or1k

/*

 * Test mmap/munmap posix calls.

 *

 * Copyright (C) 2007 - 2008 Bahadir Balban

 */

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#define PAGE_SIZE               0x1000

int mmaptest(void)

{

        int fd;

        void *base;

        int x = 0x1000;

        if ((fd = open("./newfile.txt", O_CREAT | O_TRUNC | O_RDWR, S_IRWXU)) < 0)

                perror("open:");

        else

                printf("open: Success.\n");

        /* Extend the file */

        if ((int)lseek(fd, PAGE_SIZE*16, SEEK_SET) < 0)

                perror("lseek");

        else

                printf("lseek: Success.\n");

        if (write(fd, &x, sizeof(x)) < 0)

                perror("write");

        else

                printf("write: Success.\n");

        if ((int)(base = mmap(0, PAGE_SIZE*16, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) < 0)

                perror("mmap");

        else

                printf("mmap: Success: %p\n", base);

        *(unsigned int *)(base + PAGE_SIZE*2) = 0x1000;

        if (msync(base + PAGE_SIZE*2, PAGE_SIZE, MS_SYNC) < 0)

                perror("msync");

        else

                printf("msync: Success: %p\n", base);

        if (munmap(base + PAGE_SIZE*2, PAGE_SIZE) < 0)

                perror("munmap");

        else

                printf("munmap: Success: %p\n", base);

        *(unsigned int *)(base + PAGE_SIZE*3) = 0x1000;

        *(unsigned int *)(base + PAGE_SIZE*1) = 0x1000;

        return 0;

}