vdprintf(3) -- Linux man page
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)
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