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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 stdio stream.
These functions are GNU extensions that are specified in the next
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