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I never call write() but I error check right there, check amount written, and loop if EINTR, EAGAIN if O_NONBLOCK, too, all part of the joys of raw I/O:
char *write_point ;
int char_to_write ;
int...

#include<stdio.h>
#include<sys/types.h>
#include<sys/mman.h>
#include<stdlib.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<unistd.h>
#include<signal.h>
#include<string.h>

main(int...

Well your first problem is that 'If' is not a keyword in C, whereas 'if' is. As an aside, you ought not put your call to strlen() inside the loop like you have. Change your code from:

for(i=0;i<...

Now that you've mapped it, it's just memory. If you know how to use an array, this isn't much different.

void *mem=mmap(...);
char *textdata=(char *)mem;

printf("char 0 is %c\n",...

man mmap is very a good start. Read up on the options I'm feeding mmap in the snippet below.

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

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