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Linux 2.6 - man page for freopen (linux section 3posix)

FREOPEN(P)			    POSIX Programmer's Manual			       FREOPEN(P)

       freopen - open a stream

       #include <stdio.h>

       FILE *freopen(const char *restrict filename, const char *restrict mode,
	      FILE *restrict stream);

       The freopen() function shall first attempt to flush the stream and close any file descrip-
       tor associated with stream. Failure to flush or close  the  file  descriptor  successfully
       shall be ignored. The error and end-of-file indicators for the stream shall be cleared.

       The  freopen()  function  shall	open  the file whose pathname is the string pointed to by
       filename and associate the stream pointed to by stream with it. The mode argument shall be
       used just as in fopen().

       The original stream shall be closed regardless of whether the subsequent open succeeds.

       If  filename is a null pointer, the freopen() function shall attempt to change the mode of
       the stream to that specified by mode, as if the name of the file currently associated with
       the stream had been used. It is implementation-defined which changes of mode are permitted
       (if any), and under what circumstances.

       After a successful call to the freopen() function, the orientation of the stream shall  be
       cleared,    the encoding rule shall be cleared,	and the associated mbstate_t object shall
       be set to describe an initial conversion state.

       The largest value that can be represented correctly in an object of type  off_t	shall  be
       established as the offset maximum in the open file description.

       Upon  successful completion, freopen() shall return the value of stream. Otherwise, a null
       pointer shall be returned,    and errno shall be set to indicate the error.

       The freopen() function shall fail if:

       EACCES Search permission is denied on a component of the path prefix, or the  file  exists
	      and  the	permissions  specified by mode are denied, or the file does not exist and
	      write permission is denied for the parent directory of the file to be created.

       EINTR  A signal was caught during freopen().

       EISDIR The named file is a directory and mode requires write access.

       ELOOP  A loop exists in symbolic links encountered during resolution of the path argument.

       EMFILE {OPEN_MAX} file descriptors are currently open in the calling process.


	      The length of the filename argument exceeds {PATH_MAX} or a pathname  component  is
	      longer than {NAME_MAX}.

       ENFILE The maximum allowable number of files is currently open in the system.

       ENOENT A  component  of	filename  does	not name an existing file or filename is an empty

       ENOSPC The directory or file system that would contain the new file  cannot  be	expanded,
	      the file does not exist, and it was to be created.

	      A component of the path prefix is not a directory.

       ENXIO  The named file is a character special or block special file, and the device associ-
	      ated with this special file does not exist.

	      The named file is a regular file and the size of the  file  cannot  be  represented
	      correctly in an object of type off_t.

       EROFS  The named file resides on a read-only file system and mode requires write access.

       The freopen() function may fail if:

       EINVAL The value of the mode argument is not valid.

       ELOOP  More  than  {SYMLOOP_MAX}  symbolic links were encountered during resolution of the
	      path argument.


	      Pathname resolution of a symbolic link produced an intermediate result whose length
	      exceeds {PATH_MAX}.

       ENOMEM Insufficient storage space is available.

       ENXIO  A request was made of a nonexistent device, or the request was outside the capabil-
	      ities of the device.

	      The file is a pure procedure (shared text) file that is  being  executed	and  mode
	      requires write access.

       The following sections are informative.

   Directing Standard Output to a File
       The following example logs all standard output to the /tmp/logfile file.

	      #include <stdio.h>
	      FILE *fp;
	      fp = freopen ("/tmp/logfile", "a+", stdout);

       The  freopen()  function is typically used to attach the preopened streams associated with
       stdin, stdout, and stderr to other files.



       fclose()  ,  fopen()  ,	fdopen()  ,  mbsinit()	,  the	 Base	Definitions   volume   of
       IEEE Std 1003.1-2001, <stdio.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       FREOPEN(P)

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