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+.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.\" Text fragments inspired by Martin Schulze <joey@infodrom.org>.
+.\"
+.TH DPRINTF 3 2001-12-18 "GNU" "Linux Programmer's Manual"
+.SH NAME
+dprintf, vdprintf \- print to a file descriptor
+.SH SYNOPSIS
+.B #define _GNU_SOURCE
+.br
+.B #include <stdio.h>
+.sp
+.BI "int dprintf(int " fd ", const char *" format ", ...);"
+.sp
+.BI "int vdprintf(int " fd ", const char *" format ", va_list " ap );
+.SH DESCRIPTION
+The functions
+.B dprintf
+and
+.B vdprintf
+(as found in the glibc2 library) are exact analogues of
+.B fprintf
+and
+.BR vfprintf ,
+except that they output to a file descriptor
+.I fd
+instead of to a given stream.
+.SH NOTES
+These functions are GNU extensions, not in C or POSIX.
+Clearly, the names were badly chosen.
+Many systems (like MacOS) have incompatible functions called
+.IR dprintf ,
+usually some debugging version of
+.IR printf ,
+perhaps with a prototype like
+
+.BI "void dprintf (int level, const char *" format ", ...);"
+
+where the first parameter is a debugging level (and output is to
+.IR stderr ).
+Moreover,
+.B dprintf
+(or
+.BR DPRINTF )
+is also a popular macro name for a debugging printf.
+So, probably, it is better to avoid this function in programs
+intended to be portable.
+
+A better name would have been
+.IR fdprintf .
+.SH "SEE ALSO"
+.BR printf (3)