Updating a file random access in c


13-Nov-2017 11:35

Both types of files have advantages and disadvantages.

If you are always accessing information in the same order, a sequential-access file is faster.

We can use the pointer to jump to a specific byte to access the data.

The example given in part 1 illustrates this by reading a specific byte you specify. mmap is then applied to map the entire file into memory.

If we define as int, then we can access the data as ints.

updating a file random access in c-14

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Multiple views may also be necessary if the file is greater than the size of the application’s logical memory space available for memory mapping (2 GB on a 32-bit computer). Otherwise, it returns a value of MAP_FAILED and sets errno.