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semget — ???ޥե? ID ??????????

?饤?֥???

Standard C Library (libc, -lc)

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<sys/types.h> <sys/ipc.h> <sys/sem.h> int semget(key_t key, int nsems, int flag)

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key ?? flag ???ͤ˴??Ť??? semget() ?Ͽ????˺??????줿?????뤤?? ????????¸?ߤ??륻?ޥե??????μ??̻Ҥ??֤??ޤ??? ?????ϥե?????̾?????????Ƥ??ޤ??? ?????? IPC ???֥??????Ȥ?̾?????դ????ϥ??ɥ????󶡤??ޤ??? ?????????ꤹ????ˡ?? 3 ?Ĥ????ޤ?:

• IPC_PRIVATE ???????Ǥ??ޤ??? ???ξ??硢?????? IPC ???֥??????Ȥ??????????ޤ???
• ???????????????Ǥ??ޤ??? key ???б????? IPC ???֥??????Ȥ????ꤵ???Ƥ??餺?? ?????? IPC_CREAT ?ӥåȤ? flag ?????????ꤷ?Ƥ??????硢?????? IPC ???֥??????Ȥ??????????ޤ???
• ftok(3) ?ؿ??????Ѥ??ơ??ѥ?̾???饭?????????Ǥ??ޤ???

???????????????? IPC ???֥??????ȤΥ⡼?ɤϡ????????????????? ( OR ) ?? flag ?????????ꤹ?뤳?ȤǷ??ꤵ???ޤ?:

SEM_R

?桼???Ѥ??ɼ??ꥢ??????

SEM_A

?桼???Ѥν񴹤?????????

(SEM_R>>3)

???롼???Ѥ??ɼ??ꥢ??????

(SEM_A>>3)

???롼???Ѥν񴹤?????????

(SEM_R>>6)

????¾?Ѥ??ɼ??ꥢ??????

(SEM_A>>6)

????¾?Ѥν񴹤?????????

?????????ޥե????礬?????????Ƥ??????硢 nsems ?????Ѥ??ơ?????????????????ɬ?פΤ??륻?ޥե??ο??򼨤??ޤ??? ?????Ǥʤ????硢 nsems ?? 0 ?Ȥ??ƻ????Ǥ??ޤ???

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semget() ?????ƥॳ?????ϡ??????˴?λ?????ȥ??ޥե??????μ??̻Ҥ??֤??ޤ??? ?????Ǥʤ??????ϡ?-1 ???֤??????顼?򼨤??褦?? errno ?????ꤷ?ޤ???

???顼

semget() ?????ƥॳ?????ϼ??ξ????˽????˼??Ԥ??ޤ?:

[EACCES]

?????????ѡ??ߥå??????㳲??

[EEXIST]

IPC_CREAT ?????? IPC_EXCL ?????ꤵ???Ƥ????Τˡ? key ???б????륻?ޥե????礬????¸?ߤ??ޤ???

[EINVAL]

?׵ᤵ?줿???ޥե??ο????? ?????ƥब????ñ?̤Dzݤ??Ƥ????????ͤ?Ķ?ᤷ?Ƥ??ޤ???

[ENOSPC]

???Ѳ?ǽ?ʥ??ޥե?????­???Ƥ??ޤ???

[ENOSPC]

?????ͥ뤬 struct semid_ds ?????????Ƥ????ޤ????Ǥ?????

[ENOENT]

key ???б????륻?ޥե????礬???Ĥ??餺?????κݤ? IPC_CREAT ?????ꤵ???Ƥ??ޤ????Ǥ?????

??Ϣ????

semctl(2), semop(2), ftok(3)