👤
Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:
Select Section of Man Page:
Select Man Page Repository:

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

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

NAME
       fileno - map a stream pointer to a file descriptor

SYNOPSIS
       #include <stdio.h>

       int fileno(FILE *stream);

DESCRIPTION
       The  fileno() function shall return the integer file descriptor associated with the stream
       pointed to by stream.

RETURN VALUE
       Upon successful completion, fileno() shall return the integer value of the file descriptor
       associated  with stream.  Otherwise, the value -1 shall be returned and errno set to indi-
       cate the error.

ERRORS
       The fileno() function may fail if:

       EBADF  The stream argument is not a valid stream.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       Without some specification of which file descriptors are associated with these streams, it
       is  impossible  for an application to set up the streams for another application it starts
       with fork() and exec. In particular, it would not be possible to write a portable  version
       of  the sh command interpreter (although there may be other constraints that would prevent
       that portability).

FUTURE DIRECTIONS
       None.

SEE ALSO
       Interaction of File Descriptors and Standard I/O Streams , fdopen() , fopen() , stdin()	,
       the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT
       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					FILENO(P)


All times are GMT -4. The time now is 12:36 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password