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(3) and vfprintf(3), 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(3), 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(3).

CONFORMING TO
These functions are GNU extensions.

SEE ALSO
printf(3), feature_test_macros(7)