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H file. This constant indicates that the file is a mapped file. h> 2. To detect the end of the mapped file: a. Use the lseek subroutine to go to the end of file: eof = file_ptr + lseek(fildes, 0, 2); This example sets the value of eof to an address that is 1 byte beyond the end of file. Use this value as the end-of-file marker in the program. b. Use file_ptr as a pointer to the start of the data file, and access the data as if it were in memory: while ( file_ptr < eof) Chapter 2. Shared memory 39 { .

Use the lseek subroutine to go to the end of file: eof = file_ptr + lseek(fildes, 0, 2); This example sets the value of eof to an address that is 1 byte beyond the end of file. Use this value as the end-of-file marker in the program. b. Use file_ptr as a pointer to the start of the data file, and access the data as if it were in memory: while ( file_ptr < eof) Chapter 2. Shared memory 39 { . . (references to file using file_ptr) } c. 2 The mmap functions AIX Verions 4 supports the mmap version of memory mapping through the following functions: mmap Maps an object file into virtual memory.

However, the mmap subroutine extends this capability beyond that provided by the shmat subroutine by allowing a relatively unlimited number of such mappings to be established. While this capability increases the number of mappings supported per file object or memory segment, it can prove inefficient for applications in which many processes map the same file data into their address space. The mmap subroutine provides a unique object address for each process that maps to an object. The software accomplishes this by providing each process with a unique virtual address, known as an alias.

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