09-10-2012
Guys the error still persist in the same line 16..
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=================================
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MUNMAP(2) BSD System Calls Manual MUNMAP(2)
NAME
munmap -- remove a mapping
SYNOPSIS
#include <sys/mman.h>
int
munmap(void *addr, size_t len);
DESCRIPTION
The munmap() system call deletes the mappings for the specified address range, causing further references to addresses within the range to
generate invalid memory references.
DIRTY PAGE HANDLING
How munmap() handles a dirty page, depends on what type of memory is being unmapped:
[Anonymous] If the memory is anonymous memory and if the last reference is going away, then the contents are discarded by definition
of anonymous memory.
[System V Shared] If the memory mapping was created using System V shared memory, then the contents persist until the System V memory region
is destroyed or the system is rebooted.
[File mapping] If the mapping maps data from a file (MAP_SHARED), then the memory will eventually be written back to disk if it's dirty.
This will happen automatically at some point in the future (implementation dependent). Note: to force the memory to be
written back to the disk, use msync(2).
If there are still other references to the memory when the munmap is done, then nothing is done to the memory itself and it may be swapped
out if need be. The memory will continue to persist until the last reference goes away (except for System V shared memory in which case, see
above).
RETURN VALUES
Upon successful completion, munmap returns zero. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Munmap() will fail if:
[EINVAL] The addr parameter was not page aligned (i.e., a multiple of the page size).
[EINVAL] The len parameter was negative or zero.
[EINVAL] Some part of the region being unmapped is not part of the currently valid address space.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/mman.h>
The include file <sys/types.h> is necessary.
int
munmap(caddr_t addr, size_t len);
The type of addr has changed.
SEE ALSO
getpagesize(3), msync(2), munmap(2), mprotect(2), madvise(2), mincore(2), compat(5)
HISTORY
The munmap() function first appeared in 4.4BSD.
BSD
October 16, 2008 BSD