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

NAME
       dprintf, vdprintf - print to a file descriptor

SYNOPSIS
       #define _GNU_SOURCE
       #include <stdio.h>

       int dprintf(int fd, const char *format, ...);

       int vdprintf(int fd, const char *format, va_list ap);

DESCRIPTION
       The functions dprintf() and vdprintf() (as found in the glibc2 library)
       are exact analogues of fprintf() and vfprintf(), except that they  out‐
       put to a file descriptor fd instead of to a given stream.

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 dprintf(), usually some debugging version of printf(),
       perhaps with a prototype like

       void dprintf (int level, const char *format, ...);

       where the first parameter is  a	debugging  level  (and	output	is  to
       stderr).	 Moreover, dprintf() (or DPRINTF) is also a popular macro name
       for a debugging printf.	So, probably, it is better to avoid this func‐
       tion in programs intended to be portable.

       A better name would have been fdprintf().

CONFORMING TO
       These functions are GNU extensions.

SEE ALSO
       printf(3)

GNU				  2001-12-18			    DPRINTF(3)
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