FSEEK(3) NEWLIB FSEEK(3)NAME
4.26 `fseek', `fseeko'--set file position
SYNOPSIS
#include <stdio.h>
int fseek(FILE *FP, long OFFSET, int WHENCE)
int fseeko(FILE *FP, off_t OFFSET, int WHENCE)
int _fseek_r(struct _reent *PTR, FILE *FP,
long OFFSET, int WHENCE)
int _fseeko_r(struct _reent *PTR, FILE *FP,
off_t 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'/`fseeko' to set the position for the file iden‐
tified 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'/`ftello' to determine the current file position.
RETURNS
`fseek'/`fseeko' return `0' when successful. On failure, 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).
PORTABILITY
ANSI C requires `fseek'.
`fseeko' is defined by the Single Unix specification.
Supporting OS subroutines required: `close', `fstat', `isatty',
`lseek', `read', `sbrk', `write'.
SEE ALSOfseek is part of the library. The full documentation for is maintained
as a Texinfo manual. If info and are properly installed at your site,
the command
info
will give you access to the complete manual.
NEWLIB April 2010 FSEEK(3)
