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stdout (3)
  • stdout (3) ( Русские man: Библиотечные вызовы )
  • stdout (3) ( Linux man: Библиотечные вызовы )
  • >> stdout (3) ( POSIX man: Библиотечные вызовы )
  • stdout (4) ( FreeBSD man: Специальные файлы /dev/* )
  •  

    NAME

    stderr, stdin, stdout - standard I/O streams
     
    

    SYNOPSIS

    #include <stdio.h>

    extern FILE *stderr, *stdin, *stdout;
     

    DESCRIPTION

    The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

    A file with associated buffering is called a stream and is declared to be a pointer to a defined type FILE. The fopen() function shall create certain descriptive data for a stream and return a pointer to designate the stream in all further transactions. Normally, there are three open streams with constant pointers declared in the <stdio.h> header and associated with the standard open files.

    At program start-up, three streams shall be predefined and need not be opened explicitly: standard input (for reading conventional input), standard output (for writing conventional output), and standard error (for writing diagnostic output). When opened, the standard error stream is not fully buffered; the standard input and standard output streams are fully buffered if and only if the stream can be determined not to refer to an interactive device.

    The following symbolic values in <unistd.h> define the file descriptors that shall be associated with the C-language stdin, stdout, and stderr when the application is started:

    STDIN_FILENO
    Standard input value, stdin. Its value is 0.
    STDOUT_FILENO
    Standard output value, stdout. Its value is 1.
    STDERR_FILENO
    Standard error value, stderr. Its value is 2.

    The stderr stream is expected to be open for reading and writing.  

    RETURN VALUE

    None.  

    ERRORS

    No errors are defined.

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    None.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    fclose() , feof() , ferror() , fileno() , fopen() , fread() , fseek() , getc() , gets() , popen() , printf() , putc() , puts() , read() , scanf() , setbuf() , setvbuf() , tmpfile() , ungetc() , vprintf() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>, <unistd.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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