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-'\" t
-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek and the American National Standards Committee X3,
-.\" on Information Processing Systems.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\" @(#)fseek.3 6.11 (Berkeley) 6/29/91
-.\"
-.\" Converted for Linux, Mon Nov 29 15:22:01 1993, faith@cs.unc.edu
-.\"
-.TH fseek 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-fgetpos, fseek, fsetpos, ftell, rewind \- reposition a stream
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.P
-.BI "int fseek(FILE *" stream ", long " offset ", int " whence );
-.BI "long ftell(FILE *" stream );
-.P
-.BI "void rewind(FILE *" stream );
-.P
-.BI "int fgetpos(FILE *restrict " stream ", fpos_t *restrict " pos );
-.BI "int fsetpos(FILE *" stream ", const fpos_t *" pos );
-.fi
-.SH DESCRIPTION
-The
-.BR fseek ()
-function sets the file position indicator for the stream pointed to by
-.IR stream .
-The new position, measured in bytes, is obtained by adding
-.I offset
-bytes to the position specified by
-.IR whence .
-If
-.I whence
-is set to
-.BR SEEK_SET ,
-.BR SEEK_CUR ,
-or
-.BR 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
-.BR fseek ()
-function clears the end-of-file indicator for the stream and undoes
-any effects of the
-.BR ungetc (3)
-function on the same stream.
-.P
-The
-.BR ftell ()
-function obtains the current value of the file position indicator for the
-stream pointed to by
-.IR stream .
-.P
-The
-.BR rewind ()
-function sets the file position indicator for the stream pointed to by
-.I stream
-to the beginning of the file.
-It is equivalent to:
-.P
-.RS
-(void) fseek(stream, 0L, SEEK_SET)
-.RE
-.P
-except that the error indicator for the stream is also cleared (see
-.BR clearerr (3)).
-.P
-The
-.BR fgetpos ()
-and
-.BR fsetpos ()
-functions are alternate interfaces equivalent to
-.BR ftell ()
-and
-.BR fseek ()
-(with
-.I whence
-set to
-.BR SEEK_SET ),
-setting and storing the current value of the file offset into or from the
-object referenced by
-.IR pos .
-On some non-UNIX systems, an
-.I fpos_t
-object may be a complex object and these routines may be the only way to
-portably reposition a text stream.
-.P
-If the stream refers to a regular file
-and the resulting stream offset is beyond the size of the file,
-subsequent writes will extend the file with a hole, up to the offset,
-before committing any data.
-See
-.BR lseek (2)
-for details on file seeking semantics.
-.SH RETURN VALUE
-The
-.BR rewind ()
-function returns no value.
-Upon successful completion,
-.BR fgetpos (),
-.BR fseek (),
-.BR fsetpos ()
-return 0,
-and
-.BR ftell ()
-returns the current offset.
-Otherwise, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-The
-.I whence
-argument to
-.BR fseek ()
-was not
-.BR SEEK_SET ,
-.BR SEEK_END ,
-or
-.BR SEEK_CUR .
-Or: the resulting file offset would be negative.
-.TP
-.B ESPIPE
-The file descriptor underlying
-.I stream
-is not seekable (e.g., it refers to a pipe, FIFO, or socket).
-.P
-The functions
-.BR fgetpos (),
-.BR fseek (),
-.BR fsetpos (),
-and
-.BR ftell ()
-may also fail and set
-.I errno
-for any of the errors specified for the routines
-.BR fflush (3),
-.BR fstat (2),
-.BR lseek (2),
-and
-.BR malloc (3).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR fseek (),
-.BR ftell (),
-.BR rewind (),
-.BR fgetpos (),
-.BR fsetpos ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C89.
-.SH SEE ALSO
-.BR lseek (2),
-.BR fseeko (3)