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FSEEK(3) Linux Programmer's Manual FSEEK(3)
NAME
fgetpos, fseek, fsetpos, ftell, rewind - reposition a stream
SYNOPSIS
#include <stdio.h>
int fseek(FILE *stream, long offset, int whence);
long ftell(FILE *stream);
void rewind(FILE *stream);
int fgetpos(FILE *stream, fpos_t *pos);
int fsetpos(FILE *stream, fpos_t *pos);
DESCRIPTION
The fseek() function sets the file position indicator for the stream
pointed to by stream. The new position, measured in bytes, is obtained
by adding offset bytes to the position specified by whence. If whence
is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to
the start of the file, the current position indicator, or end-of-file,
respectively. A successful call to the fseek() function clears the
end-of-file indicator for the stream and undoes any effects of the
ungetc(3) function on the same stream.
The ftell() function obtains the current value of the file position
indicator for the stream pointed to by stream.
The rewind() function sets the file position indicator for the stream
pointed to by stream to the beginning of the file. It is equivalent
to:
(void)fseek(stream, 0L, SEEK_SET)
except that the error indicator for the stream is also cleared (see
clearerr(3)).
The fgetpos() and fsetpos() functions are alternate interfaces equiva-
lent to ftell() and fseek() (with whence set to SEEK_SET), setting and
storing the current value of the file offset into or from the object
referenced by pos. On some non-UNIX systems an fpos_t object may be a
complex object and these routines may be the only way to portably repo-
sition a text stream.
RETURN VALUE
The rewind() function returns no value. Upon successful completion,
fgetpos(), fseek(), fsetpos() return 0, and ftell() returns the current
offset. Otherwise, -1 is returned and errno is set to indicate the
error.
ERRORS
EBADF The stream specified is not a seekable stream.
EINVAL The whence argument to fseek() was not SEEK_SET, SEEK_END, or
SEEK_CUR.
The functions fgetpos(), fseek(), fsetpos(), and ftell() may also fail
and set errno for any of the errors specified for the routines
fflush(3), fstat(2), lseek(2), and malloc(3).
CONFORMING TO
The fgetpos(), fsetpos(), fseek(), ftell(), and rewind() functions con-
form to ANSI X3.159-1989 (``ANSI C'').
SEE ALSO
lseek(2), fseeko(3)
BSD MANPAGE 1993-11-29 FSEEK(3)
Man(1) output converted with
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This page was generated on Tue Feb 13 02:19:54 GMT 2007
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