_llseek - 重新讀取/寫入文件偏移量

內容簡介

#include <sys/types.h>
#include <unistd.h>

int _llseek(unsigned int fd**, unsigned long** offset_high**,** unsigned long offset_low**, loff_t *result,** unsigned int whence**);**

描述

The _llseek() function repositions the offset of the open file associated with the file descriptor fd to (offset_high<<32) | offset_low bytes relative to the beginning of the file, the current position in the file, or the end of the file, depending on whether whence is SEEK_SET, SEEK_CUR, or SEEK_END, respectively.

It returns the resulting file position in the argument result.

返回值

Upon successful completion, _llseek() returns 0. Otherwise, a value of -1 is returned and errno is set to indicate the error.

錯誤

標籤

描述

EBADF

fd is not an open file descriptor.

EFAULT

Problem with copying results to user space.

EINVAL

whence is invalid.

遵循於

這個函數是Linux特有的，應該在旨在是可移植的程序不被使用。

注意

glibc不提供包裝，這個系統調用，它調用 syscall(2).

另請參閱

• lseek (2)