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munmap(2)
NAME
munmap -- remove a mapping
LIBRARY
Standard C Library (libc, -lc)
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, and causes further references to addresses within the range to
generate invalid memory references.
RETURN VALUES
The munmap() function returns the value 0 if successful; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
The munmap() system call will fail if:
[EINVAL] The addr argument was not page aligned, the len argu-
ment was zero or negative, or some part of the region
being unmapped is outside the valid address range for
a process.
SEE ALSO
madvise(2), mincore(2), mmap(2), mprotect(2), msync(2), getpagesize(3)
HISTORY
The munmap() system call first appeared in 4.4BSD.
FreeBSD 5.4 May 27, 1994 FreeBSD 5.4
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