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

    NAME

    ftell, ftello - return a file offset in a stream
     
    

    SYNOPSIS

    #include <stdio.h>

    long ftell(FILE *stream);

    off_t ftello(FILE *stream);
     

    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.

    The ftell() function shall obtain the current value of the file-position indicator for the stream pointed to by stream.

    The ftello() function shall be equivalent to ftell(), except that the return value is of type off_t.  

    RETURN VALUE

    Upon successful completion, ftell()  and ftello()  shall return the current value of the file-position indicator for the stream measured in bytes from the beginning of the file.

    Otherwise, ftell()  and ftello() shall return -1, cast to long and off_t respectively, and set errno to indicate the error.  

    ERRORS

    The ftell()  and ftello() functions shall fail if:

    EBADF
    The file descriptor underlying stream is not an open file descriptor.
    EOVERFLOW
    For ftell(), the current file offset cannot be represented correctly in an object of type long.
    EOVERFLOW
    For ftello(), the current file offset cannot be represented correctly in an object of type off_t.
    ESPIPE
    The file descriptor underlying stream is associated with a pipe or FIFO.

    The ftell() function may fail if:

    ESPIPE
    The file descriptor underlying stream is associated with a socket.

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    None.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    fgetpos() , fopen() , fseek() , lseek() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.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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