dprintf, vdprintf — print to a file descriptor
#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 analogs of fprintf(3) and vfprintf(3), 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(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().
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright (C) 2001 Andries Brouwer <aebcwi.nl> Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. Text fragments inspired by Martin Schulze <joeyinfodrom.org>. |