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dprintf
Langue: en
Version: 2001-12-18 (fedora - 16/08/07)
Section: 3 (Bibliothèques de fonctions)
NAME
dprintf, vdprintf - print to a file descriptorSYNOPSIS
#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 likevoid 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), feature_test_macros(7)Contenus ©2006-2024 Benjamin Poulain
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