oracular (2) llseek.2.gz

NAME

       _llseek - reposition read/write file offset

LIBRARY

       Standard C library (libc, -lc)

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).

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.

RETURN VALUE

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

ERRORS

       EBADF  fd is not an open file descriptor.

       EFAULT Problem with copying results to user space.

       EINVAL whence is invalid.

VERSIONS

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

STANDARDS

       Linux.

SEE ALSO

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