Originální popis anglicky:
dprintf, vdprintf - print to a file descriptor
Návod, kniha: Linux Programmer's Manual
#define _GNU_SOURCE
#include <stdio.h>
int dprintf(int fd, const char *format, ...);
int vdprintf(int fd, const char *format, va_list
ap);
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.
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.
printf(3)
