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       dprintf, vdprintf - print to a file descriptor


       #define _GNU_SOURCE
       #include <stdio.h>

       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 given stream.


       These functions are GNU extensions.


       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(3), 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().


       printf(3), feature_test_macros(7)


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