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DPRINTF(3) Linux Programmer's Manual DPRINTF(3)
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 analogues of
fprintf and vfprintf, except that they output to a file descriptor fd instead of to a
These functions are GNU extensions, not in C or POSIX. Clearly, the names were badly cho-
sen. 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.
GNU 2001-12-18 DPRINTF(3)
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