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 .
