munmap(2)                 SYSTEM CALLS                  munmap(2)



NAME
     munmap - unmap pages of memory.

SYNOPSIS
     #include <sys/types.h>
     #include <sys/mman.h>
     int munmap(caddrt addr, sizet len);

DESCRIPTION
     The function munmap removes the mappings for  pages  in  the
     range [addr, addr + len).  Further references to these pages
     will result in the delivery of a SIGSEGV signal to the  pro-
     cess.  The function mmap often performs an implicit munmap.

RETURN VALUE
     Upon successful completion, the function  munmap  returns  a
     value  of  0;  otherwise,  it returns a value of -1 and sets
     errno to indicate an error.

ERRORS
     Under the following conditions, the  function  munmap  fails
     and sets errno to:

     EINVAL if addr is  not  a  multiple  of  the  page  size  as
            returned by sysconf.

     EINVAL if addresses in the range [addr, addr + len) are out-
            side  the valid range for the address space of a pro-
            cess.

     EINVAL The argument len has a value less than or equal to 0.

SEE ALSO
     mmap(2), sysconf(3C).





















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