:man| Alphabetical   Categories   About us 
 
DPRINTF (3) | C library functions | Unix Manual Pages | :man

NAME

dprintf, vdprintf - print to a file descriptor

CONTENTS

Synopsis
Description
Notes

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)


Share this page

     Follow us

Facebook Twitter Google+ LinkedIn


 
Created by Blin Media, 2008-2013