vdprintf

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  output
       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
       function in programs intended to be portable.

       A better name would have been fdprintf.

SEE ALSO
       printf(3)




GNU				  2001-12-18			   DPRINTF(3)