SEEK_SET offset is the absolute file position (an offset from the beginning of the file) desired. offset must be positive.
SYNOPSIS
#include
<stdio.h>
int fseek(FILE
*fp, long
offset, int
whence)
DESCRIPTION
Objects of type FILE
can have a position that records
how much of the file your program has already read. Many of the stdio
functions depend on this position,
and many change it as a side effect. You can use fseek
to set the position for the file identified
by fp.
The value of offset determines the new position, in one of three ways, selected by the value of whence (defined as macros in stdio.h).
SEEK_SET
offset is
the absolute file position (an offset from the beginning of the file) desired.
offset
must be positive.
SEEK_CUR
offset is
relative to the current file position. offset
can meaningfully
be either positive or negative.
SEEK_END
offset is
relative to the current end of file. offset
can meaningfully be either positive
(to increase the size of the file) or negative.
See ftell to determine the current file position.
RETURNS
fseek
returns 0
when successful. If fseek
fails, the result is EOF.
The reason for failure is indicated in errno:
either ESPIPE
(the stream identified by fp
doesn’t support repositioning) or EINVAL
(invalid file position).
COMPLIANCE
ANSI C requires
fseek.
Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.
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