vdprintf

DPRINTF(3)                 Linux Programmer's Manual                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 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 func-
       tion in programs intended to be portable.

       A better name would have been fdprintf.

SEE ALSO
       printf(3)




GNU                               2001-12-18                        DPRINTF(3)