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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, mea-
           sured 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
           equivalent  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
           reposition a text stream.

    RETURN VALUES
           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
           the global variable errno is set to indicate the error.

    ERRORS
           EBADF  The stream specified is not a seekable stream.

    BSD MANPAGE              29 November 1993                       1

    FSEEK(3)            Linux Programmer's Manual            FSEEK(3)

           EINVAL The whence argument  to  fseek  was  not  SEEK_SET,
                  SEEK_END, or SEEK_CUR.

           The  function  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).

### SEE ALSO

lseek,

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    STANDARDS
           The  fgetpos,  fsetpos, fseek, ftell, and rewind functions
           conform to ANSI C3.159-1989 (``ANSI C'').

    BSD MANPAGE              29 November 1993                       2

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