1DPRINTF(3)                 Linux Programmer's Manual                DPRINTF(3)
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NAME

6       dprintf, vdprintf - print to a file descriptor
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SYNOPSIS

9       #define _GNU_SOURCE
10       #include <stdio.h>
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12       int dprintf(int fd, const char *format, ...);
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14       int vdprintf(int fd, const char *format, va_list ap);
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DESCRIPTION

17       The functions dprintf() and vdprintf() (as found in the glibc2 library)
18       are exact analogues of fprintf() and vfprintf(), except that they  out‐
19       put to a file descriptor fd instead of to a given stream.
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NOTES

22       These  functions  are  GNU extensions, not in C or POSIX.  Clearly, the
23       names were badly chosen.  Many systems (like MacOS)  have  incompatible
24       functions called dprintf(), usually some debugging version of printf(),
25       perhaps with a prototype like
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27       void dprintf (int level, const char *format, ...);
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29       where the first parameter is  a  debugging  level  (and  output  is  to
30       stderr).  Moreover, dprintf() (or DPRINTF) is also a popular macro name
31       for a debugging printf.  So, probably, it is better to avoid this func‐
32       tion in programs intended to be portable.
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34       A better name would have been fdprintf().
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CONFORMING TO

37       These functions are GNU extensions.
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SEE ALSO

40       printf(3), feature_test_macros(7)
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44GNU                               2001-12-18                        DPRINTF(3)