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    Command:

    stdio

    
    
    

    SYNOPSIS

           #include <stdio.h>
    
           FILE *stdin;
           FILE *stdout;
           FILE *stderr;
    
    
    

    DESCRIPTION

           The  standard  I/O  library  provides  a  simple and efficient buffered
           stream I/O interface.  Input and output is  mapped  into  logical  data
           streams  and the physical I/O characteristics are concealed.  The func-
           tions and macros are listed below; more information is  available  from
           the individual man pages.
    
           A  stream  is associated with an external file (which may be a physical
           device) by opening a file, which may involve creating a new file.  Cre-
           ating  an existing file causes its former contents to be discarded.  If
           a file can support positioning  requests  (such  as  a  disk  file,  as
           opposed  to  a terminal) then a file position indicator associated with
           the stream is positioned at the start of the file (byte  zero),  unless
           the  file  is  opened  with append mode.  If append mode is used, it is
           unspecified whether the position indicator will be placed at the  start
           or the end of the file.  The position indicator is maintained by subse-
           quent reads, writes and positioning requests.  All input occurs  as  if
           the  characters were read by successive calls to the fgetc(3) function;
           all output takes place as if all characters were written by  successive
           calls to the fputc(3) function.
    
           A  file  is  disassociated  from  a stream by closing the file.  Output
           streams are flushed (any unwritten buffer contents are  transferred  to
           the host environment) before the stream is disassociated from the file.
           The value of a pointer to a FILE object is indeterminate after  a  file
           is closed (garbage).
    
           A  file  may  be  subsequently reopened, by the same or another program
           execution, and its contents reclaimed or modified (if it can be reposi-
           tioned  at  the  start).   If the main function returns to its original
           caller, or the exit(3) function is called, all open  files  are  closed
           (hence  all  output  streams  are  flushed) before program termination.
           Other methods of program termination, such as abort(3)  do  not  bother
           about closing files properly.
    
           At  program  startup, three text streams are predefined and need not be
           opened explicitly: standard input  (for  reading  conventional  input),
           standard  output  (for  writing conventional input), and standard error
           (for  writing  diagnostic  output).   These  streams  are   abbreviated
           stdin,stdout and stderr.  When opened, the standard error stream is not
           fully buffered;  the  standard  input  and  output  streams  are  fully
           buffered  if  and  only  if  the streams do not refer to an interactive
           device.
    
           Output streams that refer to terminal devices are always line  buffered
           without  first  removing their current definitions with #undef: BUFSIZ,
           EOF, FILENAME_MAX, FOPEN_MAX,  L_cuserid,  L_ctermid,  L_tmpnam,  NULL,
           SEEK_END,  SEEK_SET, SEEK_CUR, TMP_MAX, clearerr, feof, ferror, fileno,
           getc, getchar, putc, putchar, stderr, stdin, stdout.  Function versions
           of  the  macro functions feof, ferror, clearerr, fileno, getc, getchar,
           putc, and putchar exist and will be used if the macros definitions  are
           explicitly removed.
    
       List of functions
           Function      Description
           -------------------------------------------------------------------
           clearerr      check and reset stream status
           fclose        close a stream
           fdopen        stream open functions
           feof          check and reset stream status
           ferror        check and reset stream status
           fflush        flush a stream
           fgetc         get next character or word from input stream
           fgetpos       reposition a stream
           fgets         get a line from a stream
           fileno        return the integer descriptor of the argument stream
           fopen         stream open functions
           fprintf       formatted output conversion
           fpurge        flush a stream
           fputc         output a character or word to a stream
           fputs         output a line to a stream
           fread         binary stream input/output
           freopen       stream open functions
           fscanf        input format conversion
           fseek         reposition a stream
           fsetpos       reposition a stream
           ftell         reposition a stream
           fwrite        binary stream input/output
           getc          get next character or word from input stream
           getchar       get next character or word from input stream
           gets          get a line from a stream
           getw          get next character or word from input stream
           mktemp        make temporary filename (unique)
           perror        system error messages
           printf        formatted output conversion
           putc          output a character or word to a stream
           putchar       output a character or word to a stream
           puts          output a line to a stream
           putw          output a character or word to a stream
           remove        remove directory entry
           rewind        reposition a stream
           scanf         input format conversion
           setbuf        stream buffering operations
           setbuffer     stream buffering operations
           setlinebuf    stream buffering operations
           setvbuf       stream buffering operations
           sprintf       formatted output conversion
           vsscanf       input format conversion
    
    
    

    CONFORMING TO

           The stdio library conforms to C89.
    
    
    

    SEE ALSO

           close(2), open(2), read(2), write(2), stdout(3), unlocked_stdio(3)
    
                                      2001-12-26                          STDIO(3)
    
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