sunos man page for llseek

llseek(2)							   System Calls 							 llseek(2)

NAME
       llseek - move extended read/write file pointer

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

       offset_t llseek(int fildes, offset_t offset, int whence);

DESCRIPTION
       The llseek() function sets the 64-bit extended file pointer associated with the open file descriptor specified by fildes as follows:

	 o  If whence is SEEK_SET, the pointer is set to offset bytes.

	 o  If whence is SEEK_CUR, the pointer is set to its current location plus offset.

	 o  If whence is SEEK_END, the pointer is set to the size of the file plus offset.

       Although  each  file  has a 64-bit file pointer associated with it, some existing file system types (such as tmpfs) do not support the full
       range of 64-bit offsets.  In particular, on such file systems, non-device files remain limited to  offsets  of  less  than  two	gigabytes.
       Device drivers may support offsets of up to 1024 gigabytes for device special files.

       Some devices are incapable of seeking. The value of the file pointer associated with such a device is undefined.

RETURN VALUES
       Upon  successful  completion,  llseek()	returns the resulting pointer location as measured in bytes from the beginning of the file. Remote
       file descriptors are the only ones that allow negative file pointers. Otherwise, -1 is returned, the file pointer  remains  unchanged,  and
       errno is set to indicate the error.

ERRORS
       The llseek() function will fail if:

       EBADF	       The fildes argument is not an open file descriptor.

       EINVAL	       The  whence argument is not SEEK_SET, SEEK_CUR, or SEEK_END; the offset argument is not a valid offset for this file system
		       type; or the fildes argument is not a remote file descriptor and the resulting file pointer would be negative.

       ESPIPE	       The fildes argument is associated with a pipe or FIFO.

SEE ALSO
       creat(2), dup(2), fcntl(2), lseek(2), open(2)

SunOS 5.10							    6 Jan 1999								 llseek(2)