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STDIO(3S)                                                            STDIO(3S)



NAME
       stdio - standard buffered input/output package

SYNOPSIS
       #include <&lt;stdio.h>&gt;

       FILE *stdin;
       FILE *stdout;
       FILE *stderr;

DESCRIPTION
       The  functions  described  in Sections 3S constitute an efficient user-
       level buffering scheme.  The in-line macros  getc  and  putc(3)  handle
       characters  quickly.   The  higher  level  routines gets, fgets, scanf,
       fscanf, fread, puts, fputs, printf, fprintf, fwrite all  use  getc  and
       putc; they can be freely intermixed.

       A file with associated buffering is called a stream, and is declared to
       be a pointer to a defined type FILE.  Fopen(3) creates certain descrip-
       tive data for a stream and returns a pointer to designate the stream in
       all further transactions.  There are three normally open  streams  with
       constant  pointers declared in the include file and associated with the
       standard open files:

       stdin     standard input file
       stdout    standard output file
       stderr    standard error file

       A constant `pointer' NULL (0) designates no stream at all.

       An integer constant EOF (-1) is returned upon end of file or  error  by
       integer functions that deal with streams.

       Any  routine  that  uses the standard input/output package must include
       the header file <stdio.h> of pertinent macro  definitions.   The  func-
       tions  and  constants  mentioned in sections labeled 3S are declared in
       the include file and need no further declaration.  The  constants,  and
       the  following  `functions' are implemented as macros; redeclaration of
       these names is perilous: getc, getchar, putc,  putchar,  feof,  ferror,
       fileno.

SEE ALSO
       open(2), close(2), read(2), write(2)

DIAGNOSTICS
       The value EOF is returned uniformly to indicate that a FILE pointer has
       not been initialized with fopen, input (output) has been  attempted  on
       an  output (input) stream, or a FILE pointer designates corrupt or oth-
       erwise unintelligible FILE data.



                                                                     STDIO(3S)