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   _llseek    ( 2 )

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Имя (Name)

_llseek - reposition read/write file offset

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Синопсис (Synopsis)

#include <sys/syscall.h>      /* Definition of SYS_* constants */
       #include <unistd.h>

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

       Note: glibc provides no wrapper for _llseek(), necessitating the
       use of syscall(2).

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Описание (Description)

Note: for information about the llseek(3) library function, see
       lseek64(3).

       The _llseek() system call repositions the offset of the open file
       description associated with the file descriptor fd to the value

              (offset_high << 32) | offset_low

       This new offset is a byte offset relative to the beginning of the
       file, the current file offset, or the end of the file, depending
       on whether whence is SEEK_SET, SEEK_CUR, or SEEK_END,
       respectively.

       The new file offset is returned in the argument result.  The
       type loff_t is a 64-bit signed type.

       This system call exists on various 32-bit platforms to support
       seeking to large file offsets.

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Возвращаемое значение (Return value)

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

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Ошибки (Error)

EBADF  fd is not an open file descriptor.

       EFAULT Problem with copying results to user space.

       EINVAL whence is invalid.

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Стандарты (Conforming to)

This function is Linux-specific, and should not be used in
       programs intended to be portable.

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Примечание (Note)

You probably want to use the lseek(2) wrapper function instead.

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Смотри также (See also)

lseek(2), open(2), lseek64(3)

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