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dprintf, vdprintf - print to a file descriptor
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.
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().
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