System Calls                                            munmap(2)



NAME
     munmap - unmap pages of memory

SYNOPSIS
     #include 

     int munmap(void *addr, sizet 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 esta-
     blished by a prior call to mmap(2), the  behavior  is  unde-
     fined.  After  a  successful call to munmap() and before any
     subsequent 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.

ERORS
     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.


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    


SEE ALSO




SunOS 5.11           Last change: 5 Jan 1998                    1






System Calls                                            munmap(2)



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






















































SunOS 5.11           Last change: 5 Jan 1998                    2