DPRINTF

Section: Linux Programmer's Manual (3)
Updated: 2001-12-18
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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().  

CONFORMING TO

These functions are GNU extensions.  

SEE ALSO

printf(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
NOTES
CONFORMING TO
SEE ALSO

linux.jgfs.net manual pages