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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 )
  •  

    NAME

    freopen - open a stream
     
    

    SYNOPSIS

    #include <stdio.h>
    
    FILE *freopen(const char *filename, const char *mode, FILE *stream);
    

     

    DESCRIPTION

    The freopen() function first attempts to flush the stream and close any file descriptor associated with stream. Failure to flush or close the file successfully is ignored. The error and end-of-file indicators for the stream are cleared.

    The freopen() function opens the file whose pathname is the string pointed to by filename and associates the stream pointed to by stream with it. The mode argument is used just as in fopen(3C).

    If filename is a null pointer and the application comforms to SUSv3 (see standards(5)), the freopen() function attempts to change the mode of the stream to that specified by mode, as though the name of the file currently associated with the stream had been used. The following changes of mode are permitted, depending upon the access mode of the file descriptor underlying the stream:

    o When + is specified, the file descriptor mode must be O_RDWR.
    o When r is specified, the file descriptor mode must be O_RDONLY or O_RDWR.
    o When a or w is specified, the file descriptor mode must be O_WRONLY or O_RDWR.

    If the filename is a null pointer and the application does not comform to SUSv3, freopen() returns a null pointer.

    The original stream is closed regardless of whether the subsequent open succeeds.

    After a successful call to the freopen() function, the orientation of the stream is cleared, the encoding rule is cleared, and the associated mbstate_t object is set to describe an initial conversion state.

    The largest value that can be represented correctly in an object of type off_t will be established as the offset maximum in the open file description.  

    RETURN VALUES

    Upon successful completion, freopen() returns the value of stream. Otherwise, a null pointer is returned and errno is set to indicate the error.  

    ERRORS

    The freopen() function will fail if:

    EACCES

    Search permission is denied on a component of the path prefix, or the file exists and the permissions specified by mode are denied, or the file does not exist and write permission is denied for the parent directory of the file to be created.

    EBADF

    The application comforms to SUSv3, the filename argument is a null pointer, and either the underlying file descriptor is not valid or the mode specified when the underlying file descriptor was opened does not support the file access modes requested by the mode argument.

    EFAULT

    The application does not comform to SUSv3 and the filename argument is a null pointer.

    EINTR

    A signal was caught during freopen().

    EISDIR

    The named file is a directory and mode requires write access.

    ELOOP

    Too many symbolic links were encountered in resolving path.

    EMFILE

    There are {OPEN_MAX} file descriptors currently open in the calling process.

    ENAMETOOLONG

    The length of the filename exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

    ENFILE

    The maximum allowable number of files is currently open in the system.

    ENOENT

    A component of filename does not name an existing file or filename is an empty string.

    ENOSPC

    The directory or file system that would contain the new file cannot be expanded, the file does not exist, and it was to be created.

    ENOTDIR

    A component of the path prefix is not a directory.

    ENXIO

    The named file is a character special or block special file, and the device associated with this special file does not exist.

    EOVERFLOW

    The current value of the file position cannot be represented correctly in an object of type off_t.

    EROFS

    The named file resides on a read-only file system and mode requires write access.

    The freopen() function may fail if:

    EINVAL

    The value of the mode argument is not valid.

    ENAMETOOLONG

    Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.

    ENOMEM

    Insufficient storage space is available.

    ENXIO

    A request was made of a non-existent device, or the request was outside the capabilities of the device.

    ETXTBSY

    The file is a pure procedure (shared text) file that is being executed and mode requires write access.

     

    USAGE

    The freopen() function is typically used to attach the preopened streams associated with stdin, stdout and stderr to other files. By default stderr is unbuffered, but the use of freopen() will cause it to become buffered or line-buffered.

    The freopen() function has a transitional interface for 64-bit file offsets. See lf64(5).  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    fclose(3C), fdopen(3C), fopen(3C), stdio(3C), attributes(5), lf64(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    ATTRIBUTES
    SEE ALSO


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