iofunc_lseek_default()

Обработчик по умолчанию для сообщений _IO_LSEEK

Прототип:

#include <sys/iofunc.h>
int iofunc_lseek_default( resmgr_context_t *ctp,
io_lseek_t *msg,
iofunc_ocb_t *ocb );

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_lseek_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.

Библиотека:

libc

Описание:

The iofunc_lseek_default() function implements POSIX semantics for the client's lseek() call, which is received as an _IO_LSEEK message by the resource manager.

You can place this function directly into the io_funcs table passed to resmgr_attach(), at the lseek position, or you can call iofunc_func_init() to initialize all of the functions to their default values.

The iofunc_lseek_default() function calls iofunc_lseek() to do the actual work.

Возвращаемое значение:

-1
Успешное завершение; the resource manager library should return a one-part IOV to the client.
EOK
The message is a combine message, and no error occurred.
EINVAL
The whence member in the _IO_LSEEK message wasn't one of SEEK_SET, SEEK_CUR, or SEEK_END, or the resulting position after the offset was applied resulted in a negative number (overflow).
EOVERFLOW
The resulting file offset is a value that can't be represented correctly in an object of type off_t.

Классификация:

ЗОСРВ «Нейтрино»

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

Тематические ссылки:

io_lseek_t, iofunc_func_init(), iofunc_lseek(), iofunc_ocb_t, lseek(), resmgr_attach(), resmgr_context_t, resmgr_io_funcs_t




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