|| FreeBSD System Calls Manual
remove a mapping
Standard C Library (libc, -lc)
#include < sys/mman.h>
munmap( void *addr, size_t len);
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.
() system call will fail if:
addr argument was not page aligned, the
len argument was zero or negative, or some part of the region being unmapped is outside the valid address range for a process.
munmap() system call first appeared in