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shmdt (3)
  • shmdt (2) ( Solaris man: Системные вызовы )
  • shmdt (2) ( FreeBSD man: Системные вызовы )
  • shmdt (2) ( Русские man: Системные вызовы )
  • shmdt (2) ( Linux man: Системные вызовы )
  • >> shmdt (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    shmdt - XSI shared memory detach operation
     
    

    SYNOPSIS

    #include <sys/shm.h>

    int shmdt(const void *shmaddr);
     

    DESCRIPTION

    The shmdt() function operates on XSI shared memory (see the Base Definitions volume of IEEE Std 1003.1-2001, Section 3.340, Shared Memory Object). It is unspecified whether this function interoperates with the realtime interprocess communication facilities defined in Realtime .

    The shmdt() function detaches the shared memory segment located at the address specified by shmaddr from the address space of the calling process.  

    RETURN VALUE

    Upon successful completion, shmdt() shall decrement the value of shm_nattch in the data structure associated with the shared memory ID of the attached shared memory segment and return 0.

    Otherwise, the shared memory segment shall not be detached, shmdt() shall return -1, and errno shall be set to indicate the error.  

    ERRORS

    The shmdt() function shall fail if:

    EINVAL
    The value of shmaddr is not the data segment start address of a shared memory segment.

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    The POSIX Realtime Extension defines alternative interfaces for interprocess communication. Application developers who need to use IPC should design their applications so that modules using the IPC routines described in XSI Interprocess Communication can be easily modified to use the alternative interfaces.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    XSI Interprocess Communication , Realtime , exec() , exit() , fork() , shmat() , shmctl() , shmget() , shm_open() , shm_unlink() , the Base Definitions volume of IEEE Std 1003.1-2001, <sys/shm.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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