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MUNMAP(2)		      System Calls Manual		     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 and guards	for the	speci-
       fied  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 len argument was zero, or	some part of  the  re-
			  gion	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)

STANDARDS
       The munmap() system call	conforms to .  Portable	programs should	ensure
       that addr is a multiple of the page size	as returned by sysconf(3).

HISTORY
       The munmap() system call	first appeared in 4.4BSD.

FreeBSD	15.0		       January 16, 2025			     MUNMAP(2)

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