munmap
—
remove a mapping
Standard C Library (libc, -lc)
#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, or some
part of the region being unmapped is outside the valid address range for a
process.
The munmap
() function conforms to IEEE
Std 1003.1b-1993 (“POSIX.1b”).
The munmap
() function first appeared in
4.4BSD.