dprintf(3) [redhat man page]

DPRINTF(3)						     Linux Programmer's Manual							DPRINTF(3)

NAME

       dprintf, vdprintf - print to a file descriptor

SYNOPSIS

       #define _GNU_SOURCE
       #include <stdio.h>

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

       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.

SEE ALSO

       printf(3)

GNU
								    2001-12-18								DPRINTF(3)

Check Out this Related Man Page

DPRINTF(3)						     Linux Programmer's Manual							DPRINTF(3)

NAME

       dprintf, vdprintf - print to a file descriptor

SYNOPSIS

       #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

DESCRIPTION

       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.

CONFORMING TO

       These functions are GNU extensions that are nowadays specified in POSIX.1-2008.

SEE ALSO

       printf(3)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2010-09-15								DPRINTF(3)

Linux and UNIX Man Pages

dprintf(3) [redhat man page]

Check Out this Related Man Page