The OpenNET Project / Index page

[ новости /+++ | форум | wiki | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

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

  • BSD mandoc
     

    NAME

    
    
    shmget
    
     - obtain a shared memory identifier
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <machine/param.h>
       #include <sys/types.h>
       #include <sys/ipc.h>
       #include <sys/shm.h>
    int shmget (key_t key size_t size int flag);
     

    DESCRIPTION

    Based on the values of Fa key and Fa flag , shmget ();
    returns the identifier of a newly created or previously existing shared memory segment. The key is analogous to a filename: it provides a handle that names an IPC object. There are three ways to specify a key:

    The mode of a newly created IPC object is determined by OR 'ing the following constants into the Fa flag argument:

    SHM_R
    Read access for user.
    SHM_W
    Write access for user.
    ( SHM_R>>3
    Read access for group.
    ( SHM_W>>3
    Write access for group.
    ( SHM_R>>6
    Read access for other.
    ( SHM_W>>6
    Write access for other.

    When creating a new shared memory segment, Fa size indicates the desired size of the new segment in bytes. The size of the segment may be rounded up to a multiple convenient to the kernel (i.e., the page size).  

    RETURN VALUES

    Upon successful completion, shmget ();
    returns the positive integer identifier of a shared memory segment. Otherwise, -1 is returned and errno set to indicate the error.  

    ERRORS

    The shmget ();
    system call will fail if:

    Bq Er EINVAL
    Size specified is greater than the size of the previously existing segment. Size specified is less than the system imposed minimum, or greater than the system imposed maximum.
    Bq Er ENOENT
    No shared memory segment was found matching Fa key , and IPC_CREAT was not specified.
    Bq Er ENOSPC
    The kernel was unable to allocate enough memory to satisfy the request.
    Bq Er EEXIST
    IPC_CREAT and IPC_EXCL were specified, and a shared memory segment corresponding to Fa key already exists.

     

    SEE ALSO

    shmat(2), shmctl(2), shmdt(2), ftok(3)


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO


    Поиск по тексту MAN-ов: 




    Спонсоры:
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2021 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру