iofunc_chown()

Обработать сообщение _IO_CHOWN

Прототип:

#include <sys/iofunc.h>
int iofunc_chown ( resmgr_context_t *ctp,
io_chown_t *msg,
iofunc_ocb_t *ocb,
iofunc_attr_t *attr );

Аргументы:

ctp
A pointer to a resmgr_context_t structure that the resource-manager library uses to pass context information between functions.
msg
A pointer to the io_chown_t structure that contains the message that the resource manager received.
ocb
A pointer to the iofunc_ocb_t structure for the Open Control Block that was created when the client opened the resource.
attr
A pointer to the iofunc_attr_t structure that describes the characteristics of the device that's associated with your resource manager.

Библиотека:

libc

Описание:

The iofunc_chown() helper function implements POSIX semantics for the client's chown() call, which is received as an _IO_CHOWN message by the resource manager.

The iofunc_chown() function verifies that the client has the necessary permissions to effect a chown on the attribute. If so, the chown is performed, modifying elements of the ocb->attr structure. As per POSIX 1003.1, if the client isn't root, iofunc_chown() clears the set-user-id and set-group-id bits in the ocb->attr->mode member.

This function takes care of updating the IOFUNC_ATTR_CTIME, IOFUNC_ATTR_DIRTY_TIME, and IOFUNC_ATTR_DIRTY_MODE bits in ocb->attr->flags. You can use iofunc_time_update(), to update the appropriate time fields in ocb->attr.

Возвращаемое значение:

EOK
Успешное завершение.
EROFS
An attempt was made to chown on a read-only filesystem.
EACCES
The client doesn't have permissions to do the operation.
EPERM
The group ID or owner ID didn't match.

Классификация:

ЗОСРВ «Нейтрино»

Точка остановки потока
Нет
Обработчик прерываний
Нет
Обработчик сигналов
Да
В потоке
Да

Тематические ссылки:

chown(), io_chown_t, iofunc_attr_t, iofunc_chmod(), iofunc_chown_default(), iofunc_ocb_t, iofunc_time_update(), resmgr_attach(), resmgr_context_t




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