#include <sys/types.h> #include <unistd.h> int lseek( int fildes, off_t offset, int whence );
Fildes
is not an open file descriptor.
Fildes
is associated with a pipe, socket or FIFO.
Whence
is not a proper value.
The lseek
function repositions the offset of the file descriptor
fildes
to the argument offset according to the directive whence.
The argument fildes
must be an open file descriptor. Lseek
repositions the file pointer fildes as follows:
whence
is SEEK_SET, the offset is set to offset
bytes.
whence
is SEEK_CUR, the offset is set to its current location
plus offset bytes.
whence
is SEEK_END, the offset is set to the size of the
file plus offset
bytes.
The lseek
function allows the file offset to be set beyond the end
of the existing end-of-file of the file. If data is later written at this
point, subsequent reads of the data in the gap return bytes of zeros
(until data is actually written into the gap).
Some devices are incapable of seeking. The value of the pointer associated with such a device is undefined.
NONE
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