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freopen (3)
  • freopen (3) ( Solaris man: Библиотечные вызовы )
  • >> freopen (3) ( FreeBSD man: Библиотечные вызовы )
  • freopen (3) ( Русские man: Библиотечные вызовы )
  • freopen (3) ( Linux man: Библиотечные вызовы )
  • freopen (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    fopen
    
     
    fdopen
    
     
    freopen
    
     - stream open functions
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <stdio.h>
    FILE * fopen (const char * restrict path const char * restrict mode);
    FILE * fdopen (int fildes const char *mode);
    FILE * freopen (const char *path const char *mode FILE *stream);
     

    DESCRIPTION

    The fopen ();
    function opens the file whose name is the string pointed to by Fa path and associates a stream with it.

    The argument Fa mode points to a string beginning with one of the following sequences (Additional characters may follow these sequences.):

    ``r ''
    Open text file for reading. The stream is positioned at the beginning of the file.
    ``r+ ''
    Open for reading and writing. The stream is positioned at the beginning of the file.
    ``w ''
    Truncate to zero length or create text file for writing. The stream is positioned at the beginning of the file.
    ``w+ ''
    Open for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file.
    ``a ''
    Open for writing. The file is created if it does not exist. The stream is positioned at the end of the file. Subsequent writes to the file will always end up at the then current end of file, irrespective of any intervening fseek(3) or similar.
    ``a+ ''
    Open for reading and writing. The file is created if it does not exist. The stream is positioned at the end of the file. Subsequent writes to the file will always end up at the then current end of file, irrespective of any intervening fseek(3) or similar.

    The Fa mode string can also include the letter ``b'' either as a third character or as a character between the characters in any of the two-character strings described above. This is strictly for compatibility with St -isoC and has no effect; the ``b'' is ignored.

    Any created files will have mode \*q S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH \*q (0666 ) as modified by the process' umask value (see umask(2)).

    Reads and writes may be intermixed on read/write streams in any order, and do not require an intermediate seek as in previous versions of stdio This is not portable to other systems, however; ANSI C requires that a file positioning function intervene between output and input, unless an input operation encounters end-of-file.

    The fdopen ();
    function associates a stream with the existing file descriptor, Fa fildes . The mode of the stream must be compatible with the mode of the file descriptor. When the stream is closed via fclose(3), Fa fildes is closed also.

    The freopen ();
    function opens the file whose name is the string pointed to by Fa path and associates the stream pointed to by Fa stream with it. The original stream (if it exists) is closed. The Fa mode argument is used just as in the fopen ();
    function.

    If the Fa path argument is NULL freopen ();
    attempts to re-open the file associated with Fa stream with a new mode. The new mode must be compatible with the mode that the stream was originally opened with:

    The primary use of the freopen ();
    function is to change the file associated with a standard text stream ( stderr , stdin or stdout )  

    RETURN VALUES

    Upon successful completion fopen (,);
    fdopen ();
    and freopen ();
    return a FILE pointer. Otherwise, NULL is returned and the global variable errno is set to indicate the error.  

    ERRORS

    Bq Er EINVAL
    The Fa mode argument to fopen (,);
    fdopen (,);
    or freopen ();
    was invalid.

    The fopen (,);
    fdopen ();
    and freopen ();
    functions may also fail and set errno for any of the errors specified for the routine malloc(3).

    The fopen ();
    function may also fail and set errno for any of the errors specified for the routine open(2).

    The fdopen ();
    function may also fail and set errno for any of the errors specified for the routine fcntl(2).

    The freopen ();
    function may also fail and set errno for any of the errors specified for the routines open(2), fclose(3) and fflush(3).  

    SEE ALSO

    open(2), fclose(3), fileno(3), fseek(3), funopen(3)  

    STANDARDS

    The fopen ();
    and freopen ();
    functions conform to St -isoC . The fdopen ();
    function conforms to St -p1003.1-88 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    STANDARDS


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