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munmap(2) System Calls Manual munmap(2)
munmap - unmaps memory of a character device
caddr_t munmap(addr, len)
addr Specifies the address space of the calling process at which the unmapping begins.
len Specifies the number of bytes to unmap.
The system call unmaps a specified number of bytes (len) starting at a specified address (addr) from the address space of the calling
process. You mapped this device in a previous call to Subsequent access to the unmapped region results in a signal. You cannot unmap
data, stack, and text segments using
The system call rounds len to the nearest multiple of page size as returned by
The range [addr, addr + len] may contain more than one mapped region created by In this case, unmaps all of the mapped regions.
All of the mapped regions must be wholly contained in the range [addr, addr + len]. That is, addr must be the beginning of some mapped
region and addr + len must be the end of some (possibly different) mapped region.
If successful, returns 0. Otherwise, it returns -1 and sets the errno argument to one of the errors listed in the Diagnostics section.
The call to fails if one or more of the following is true:
[EINVAL] The address you specified in addr is not a multiple of the page size as returned by
[EINVAL] The addresses in the range [addr, addr + len] are not valid in the process address space.
[EINVAL] All of the segments being unmapped are not entirely contained in the range [addr, addr + len].
getpagesize(2), getsysinfo(2), mmap(2)