I need help fixing this c code. When I ran it, it said Segmentation Fault. #include #include #inclu

[answerhappygod]

I need help fixing this c code. When I ran it, it said
Segmentation Fault.
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
int main(void) {
size_t bytesWritten = 0;
int my_offset = 0;
char *text1Ý="Data for file 1.";
char *text2Ý="Data for file 2.";
int fd1,fd2;
int PageSize;
void *address;
void *address2;
fd1 = open("/tmp/mmaptest1",
(O_CREAT |
O_TRUNC | O_RDWR),
(S_IRWXU |
S_IRWXG | S_IRWXO) );
if ( fd1 < 0 )
perror("open() error");
else {
bytesWritten = write(fd1, text1Ý,
strlen(text1Ý));
if ( bytesWritten != strlen(text1Ý) ) {
perror("write() error");
int closeRC = close(fd1);
return -1;
}
fd2 = open("/tmp/mmaptest2",
(O_CREAT |
O_TRUNC | O_RDWR),
(S_IRWXU |
S_IRWXG | S_IRWXO) );
if (fd2 < 0 )
perror("open() error");
else {
bytesWritten = write(fd2, text2Ý,
strlen(text2Ý));
if ( bytesWritten != strlen(text2Ý) )
perror("write() error");
PageSize = (int)sysconf(_SC_PAGESIZE);
if ( PageSize < 0) {
perror("sysconf() error");
}
else {
off_t lastoffset = lseek( fd1, PageSize-1,
SEEK_SET);
if (lastoffset < 0 ) {
perror("lseek() error");
}
else {
bytesWritten = write(fd1, " ", 1);
/* grow file 1 to 1 page. */
off_t lastoffset = lseek( fd2, PageSize-1,
SEEK_SET);
bytesWritten = write(fd2, " ", 1);
/* grow file 2 to 1 page. */
/*
* We want to show how to
memory map two files with
* the same memory
map. We are going to create a two page
* memory map over file
number 1, even though there is only
* one page available.
Then we will come back and remap
* the 2nd page of the
address range returned from step 1
* over the first 4096
bytes of file 2.
*/
int len;
my_offset = 0;
len = PageSize; /* Map one
page */
address = mmap(NULL,
len,
PROT_READ,
MAP_SHARED,
fd1,
my_offset );
if ( address != MAP_FAILED ) {
address2 = mmap(
((char*)address)+PageSize,
len,
PROT_READ,
MAP_SHARED | MAP_FIXED, fd2,
my_offset );
if ( address2 != MAP_FAILED )
{
/* print
data from file 1 */
printf("\n%s",address);
/* print
data from file 2 */
printf("\n%s",address2);
} /* address 2 was okay.
*/
else {
perror("mmap()
error=");
} /* mmap for file 2 failed.
*/
}
else {
perror("munmap() error=");
}
/*
* Unmap two pages.
*/
if ( munmap(address, 2*PageSize) <
0) {
perror("munmap() error");
}
else;
}
}
close(fd2);
unlink( "/tmp/mmaptest2");
}
close(fd1);
unlink( "/tmp/mmaptest1");
}
/*
* Unmap two pages.
*/
}