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

Предыдущий раздел: Описание API системной библиотеки