The OpenNET Project / Index page

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

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

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

    NAME

    semget - get set of semaphores
     
    

    SYNOPSIS

    #include <sys/types.h>
    #include <sys/ipc.h>
    #include <sys/sem.h>
    
    int semget(key_t key, int nsems, int semflg);
    

     

    DESCRIPTION

    The semget() function returns the semaphore identifier associated with key.

    A semaphore identifier and associated data structure and set containing nsems semaphores (see Intro(2)) are created for key if one of the following is true:

    o key is equal to IPC_PRIVATE.
    o key does not already have a semaphore identifier associated with it, and (semflg&IPC_CREAT) is true.

    On creation, the data structure associated with the new semaphore identifier is initialized as follows:

    o sem_perm.cuid, sem_perm.uid, sem_perm.cgid, and sem_perm.gid are set equal to the effective user ID and effective group ID, respectively, of the calling process.
    o The access permission bits of sem_perm.mode are set equal to the access permission bits of semflg.
    o sem_nsems is set equal to the value of nsems.
    o sem_otime is set equal to 0 and sem_ctime is set equal to the current time.
     

    RETURN VALUES

    Upon successful completion, a non-negative integer representing a semaphore identifier is returned. Otherwise, -1 is returned and errno is set to indicate the error.  

    ERRORS

    The semget() function will fail if:

    EACCES

    A semaphore identifier exists for key, but operation permission (see Intro(2)) as specified by the low-order 9 bits of semflg would not be granted.

    EEXIST

    A semaphore identifier exists for key but both (semflg&IPC_CREAT) and (semflg&IPC_EXCL) are both true.

    EINVAL

    The nsems argument is either less than or equal to 0 or greater than the system-imposed limit. See NOTES.

    A semaphore identifier exists for key, but the number of semaphores in the set associated with it is less than nsems and nsems is not equal to 0.

    ENOENT

    A semaphore identifier does not exist for key and (semflg&IPC_CREAT) is false.

    ENOSPC

    A semaphore identifier is to be created but the system-imposed limit on the maximum number of allowed semaphores or semaphore identifiers system-wide would be exceeded. See NOTES.

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

     

    SEE ALSO

    ipcrm(1), ipcs(1), rctladm(1M), Intro(2), semctl(2), semop(2), setrctl(2), ftok(3C), attributes(5), standards(5)  

    NOTES

    The system-imposed limit on the value of the nsems argument is the maintained on a per-process basis using the process.max-sem-nsems resource control.

    The system-imposed limit on the number of semaphore identifiers is maintained on a per-project basis using the project.max-sem-ids resource control. The zone.max-sem-ids resource control limis the total number of semaphore identifiers that can be allocated by a zone.

    See rctladm(1M) and setrctl(2) for information about using resource controls.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO
    NOTES


    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