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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 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  len  argument  was zero, 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)

STANDARDS
     The  munmap()  system  call  conforms  to IEEE Std 1003.1-2024 ("POSIX.1").
     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 ports 15.quarterly	January 16, 2025		       MUNMAP(2)

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