munmap man page on Ultrix

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munmap(2)							     munmap(2)

Name
       munmap - unmaps memory of a character device

Syntax
       #include <sys/types.h>
       #include <sys/mman.h>

       caddr_t munmap(addr, len)
       caddr_t addr;
       size_t len;

Arguments
       addr	 Specifies  the	 address space of the calling process at which
		 the unmapping begins.

       len	 Specifies the number of bytes to unmap.

Description
       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.

Restrictions
       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.

Return Value
       If  successful, returns 0.  Otherwise, it returns -1 and sets the errno
       argument to one of the errors listed in the Diagnostics section.

Diagnostics
       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].

See Also
       getpagesize(2), getsysinfo(2), mmap(2)

								     munmap(2)
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