shmdt(2)							System Calls Manual							  shmdt(2)

NAME

       shmdt - Detaches a shared memory region

SYNOPSIS

       #include <sys/shm.h>

       int shmdt(
	       const void *addr);

       Application developers may want to specify #include statements for <sys/types.h> and
	<sys/ipc.h>  before the one for <sys/shm.h> if programs are being developed for multiple platforms. The additional #include statements are
       not required on Tru64 UNIX systems or by ISO or X/Open standards, but may be required on other vendors' systems that conform to these stan-
       dards.

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       shmdt():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies  the  starting  virtual  address for the shared memory region to be detached.	This is the address returned by a previous shmat()
       call.

DESCRIPTION

       The shmdt() function detaches the shared memory region at the address specified by the addr  parameter.	 Other	instances  of  the  region
       attached at other addresses are unaffected.

RETURN VALUES

       Upon  successful completion, the shmdt() function decrements the value of shm_nattach in the data structure associated with the shared mem-
       ory ID of the attached shared memory segment and returns 0 (zero).  Upon failure,  the  shared  memory  segment	is  not  detached,  -1	is
       returned, and errno is set to indicate the error.

ERRORS

       The  shmdt()  function  sets  errno  to the specified values for the following conditions: The addr parameter does not specify the starting
       address of a shared memory region.

RELATED INFORMATION

       Functions: shmat(2), shmctl(2), shmget(2)

       Data structures: shmid_ds(4)

       Standards: standards(5) delim off

																	  shmdt(2)