shmdt man page on DigitalUNIX

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shmdt(2)							      shmdt(2)

       shmdt - Detach a shared memory region

       #include <sys/shm.h>

       int shmdt(
	       const void *addr );

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

       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       shmdt():	 XSH4.0, XSH4.2, XSH5.0

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

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

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

       The librt library contains alternative interfaces for interprocess com‐
       munication.  The names of these routines adhere to the format shm_* and
       their reference pages are listed in SEE ALSO.

       Upon successful completion, the shmdt() function decrements  the	 value
       of  shm_nattach in the data structure associated with the shared memory
       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.

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

       Functions: shmat(2), shmctl(2), shmget(2), shm_open(3), shm_unlink(3)

       Data structures: shmid_ds(4)

       Standards: standards(5)


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