dprintf (3)

#include <stdio.h>

int dprintf(int fd, const char *format, ...);

int vdprintf(int fd, const char *format, va_list ap);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

dprintf(), vdprintf():

Since glibc 2.10:

_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L

Before glibc 2.10:

_GNU_SOURCE

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 nowadays specified in POSIX.1-2008.

printf(3)

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