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munmap(2)                        System Calls                        munmap(2)



NAME
       munmap - unmap pages of memory

SYNOPSIS
       #include <sys/mman.h>

       int munmap(void *addr, size_t len);

DESCRIPTION
       The  munmap()  function  removes  the  mappings  for pages in the range
       [addr, addr + len), rounding the len argument up to the  next  multiple
       of the page size as returned by sysconf(3C). If addr is not the address
       of a mapping established by a prior call to mmap(2),  the  behavior  is
       undefined.  After  a  successful call to munmap() and before any subse-
       quent mapping of the unmapped pages, further references to these  pages
       will  result  in  the  delivery  of  a  SIGBUS or SIGSEGV signal to the
       process.

       The mmap(2) function often performs an implicit munmap().

RETURN VALUES
       Upon successful completion, munmap() returns 0; otherwise,  it  returns
       -1 and sets errno to indicate an error.

ERRORS
       The munmap() function will fail if:

       EINVAL          The   addr  argument is not a multiple of the page size
                       as returned by  sysconf(3C);  addresses  in  the  range
                       [addr,  addr + len) are outside the valid range for the
                       address space of a process; or the  len argument has  a
                       value less than or equal to 0.



ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:


       tab()     allbox;     cw(2.750000i)|    cw(2.750000i)    lw(2.750000i)|
       lw(2.750000i).  ATTRIBUTE TYPEATTRIBUTE VALUE Interface  StabilityStan-
       dard


SEE ALSO
       mmap(2), sysconf(3C), attributes(5), standards(5)



SunOS 5.10                        5 Jan 1998                         munmap(2)