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Интерактивная система просмотра системных руководств (man-ов)

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

  • BSD mandoc
     

    NAME

    
    
    ttyname
    
     
    ttyname_r
    
     
    isatty
    
     
    ttyslot
    
     - get name of associated terminal (tty) from file descriptor
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <unistd.h>
    char * ttyname (int fd);
    int ttyname_r (int fd char *buf size_t len);
    int isatty (int fd);
    int ttyslot (void);
     

    DESCRIPTION

    These functions operate on the system file descriptors for terminal type devices. These descriptors are not related to the standard I/O FILE typedef, but refer to the special device files found in /dev and named /dev/tty xx and for which an entry exists in the initialization file /etc/ttys (See ttys(5).)

    The isatty ();
    function determines if the file descriptor Fa fd refers to a valid terminal type device.

    The ttyname ();
    function gets the related device name of a file descriptor for which isatty ();
    is true.

    The ttyname ();
    function returns the name stored in a static buffer which will be overwritten on subsequent calls. The ttyname_r ();
    function takes a buffer and length as arguments to avoid this problem.

    The ttyslot ();
    function fetches the current process' control terminal number from the ttys(5) file entry.  

    RETURN VALUES

    The ttyname ();
    function returns the null terminated name if the device is found and isatty ();
    is true; otherwise a NULL pointer is returned. The ttyname_r ();
    function returns 0 if successful. Otherwise an error number is returned.

    The ttyslot ();
    function returns the unit number of the device file if found; otherwise the value zero is returned.  

    FILES

    /dev/*
    /etc/ttys

     

    ERRORS

    The ttyname_r ();
    may fail and return the following error codes:

    Bq Er ENOTTY
    The Fa fd argument is not a valid file descriptor.
    Bq Er ERANGE
    The Fa bufsize argument is smaller than the length of the string to be returned.

     

    SEE ALSO

    ioctl(2), ttys(5)  

    HISTORY

    The isatty (,);
    ttyname (,);
    and ttyslot ();
    functions appeared in AT&T System v7 . The ttyname_r ();
    function appeared in Fx 6.0 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    FILES
    ERRORS
    SEE ALSO
    HISTORY


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