MUNMAP(2) BSD Programmer's Manual MUNMAP(2)
munmap - remove a mapping
#include <sys/types.h> #include <sys/mman.h> int munmap(void *addr, size_t len);
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.
Upon successful completion, munmap returns zero. Otherwise, a value of -1 is returned and errno is set to indicate the error.
munmap() will fail if: [EINVAL] The addr parameter was not page aligned, the len parameter was negative, or some part of the region being unmapped is not part of the currently valid address space.
madvise(2), mincore(2), mlock(2), mlockall(2), mmap(2), mprotect(2), msync(2), getpagesize(3)
The munmap() function first appeared in 4.4BSD. MirOS BSD #10-current April 15, 1994 1
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