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ttcompat (7)
  • >> ttcompat (7) ( Solaris man: Макропакеты и соглашения )
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    NAME

    ttcompat - V7, 4BSD and XENIX STREAMS compatibility module
     
    

    SYNOPSIS

    #define BSD_COMP
    #include <sys/stropts.h>
    #include <sys/ioctl.h>
    ioctl(fd, I_PUSH, "ttcompat");
    

     

    DESCRIPTION

    ttcompat is a STREAMS module that translates the ioctl calls supported by the older Version 7, 4BSD, and XENIX terminal drivers into the ioctl calls supported by the termio interface (see termio(7I)). All other messages pass through this module unchanged; the behavior of read and write calls is unchanged, as is the behavior of ioctl calls other than the ones supported by ttcompat.

    This module can be automatically pushed onto a stream using the autopush mechanism when a terminal device is opened; it does not have to be explicitly pushed onto a stream. This module requires that the termios interface be supported by the modules and the application can push the driver downstream. The TCGETS, TCSETS, and TCSETSF ioctl calls must be supported. If any information set or fetched by those ioctl calls is not supported by the modules and driver downstream, some of the V7/4BSD/XENIX functions may not be supported. For example, if the CBAUD bits in the c_cflag field are not supported, the functions provided by the sg_ispeed and sg_ospeed fields of the sgttyb structure (see below) will not be supported. If the TCFLSH ioctl is not supported, the function provided by the TIOCFLUSH ioctl will not be supported. If the TCXONC ioctl is not supported, the functions provided by the TIOCSTOP and TIOCSTART ioctl calls will not be supported. If the TIOCMBIS and TIOCMBIC ioctl calls are not supported, the functions provided by the TIOCSDTR and TIOCCDTR ioctl calls will not be supported.

    The basic ioctl calls use the sgttyb structure defined by <sys/ttold.h> (included by <sys/ioctl.h>):

    struct   sgttyb   {
            char    sg_ispeed;
            char    sg_ospeed;
            char    sg_erase;
            char    sg_kill;
            int     sg_flags;
    };
    

    The sg_ispeed and sg_ospeed fields describe the input and output speeds of the device. If the speed set on the device is over B38400, then it is reported as B38400 for compatibility reasons. If it is set to B38400 and the current speed is over B38400, the change is ignored. See TIOCGETP and TIOCSETP below. The sg_erase and sg_kill fields of the argument structure specify the erase and kill characters respectively, and reflect the values in the VERASE and VKILL members of the c_cc field of the termios structure.

    The sg_flags field of the argument structure contains several flags that determine the system's treatment of the terminal. They are mapped into flags in fields of the terminal state, represented by the termios structure.

    Delay type 0 (NL0, TAB0, CR0, FF0, BS0) is always mapped into the equivalent delay type 0 in the c_oflag field of the termios structure. Other delay mappings are performed as follows:

    sg_flagsc_oflag

    BS1BS1

    FF1

    CR1

    CR2

    CR3

    TAB1

    TAB2

    XTABS

    NL1

    NL2

    NL3

    If previous TIOCLSET or TIOCLBIS ioctl calls have not selected LITOUT or PASS8 mode, and if RAW mode is not selected, the ISTRIP flag is set in the c_iflag field of the termios structure, and the EVENP and ODDP flags control the parity of characters sent to the terminal and accepted from the terminal, as follows:

    0 (neither EVENP nor ODDP)

    Parity is not to be generated on output or checked on input. The character size is set to CS8 and the PARENB flag is cleared in the c_cflag field of the termios structure.

    EVENP

    Even parity characters are to be generated on output and accepted on input. The INPCK flag is set in the c_iflag field of the termios structure, the character size is set to CS7 and the PARENB flag is set in the c_iflag field of the termios structure.

    ODDP

    Odd parity characters are to be generated on output and accepted on input. The INPCK flag is set in the c_iflag, the character size is set to CS7 and the PARENB and PARODD flags are set in the c_iflag field of the termios structure.

    EVENP|ODDP or ANYP

    Even parity characters are to be generated on output and characters of either parity are to be accepted on input. The INPCK flag is cleared in the c_iflag field, the character size is set to CS7 and the PARENB flag is set in the c_iflag field of the termios structure.

    The RAW flag disables all output processing (the OPOST flag in the c_oflag field, and the XCASE and IEXTEN flags in the c_iflag field are cleared in the termios structure) and input processing (all flags in the c_iflag field other than the IXOFF and IXANY flags are cleared in the termios structure). Eight bits of data, with no parity bit are accepted on input and generated on output; the character size is set to CS8 and the PARENB and PARODD flags are cleared in the c_cflag field of the termios structure. The signal-generating and line-editing control characters are disabled by clearing the ISIG and ICANON flags in the c_iflag field of the termios structure.

    The CRMOD flag turns input carriage return characters into linefeed characters, and output linefeed characters to be sent as a carriage return followed by a linefeed. The ICRNL flag in the c_iflag field, and the OPOST and ONLCR flags in the c_oflag field, are set in the termios structure.

    The LCASE flag maps upper-case letters in the ASCII character set to their lower-case equivalents on input (the IUCLC flag is set in the c_iflag field), and maps lower-case letters in the ASCII character set to their upper-case equivalents on output (the OLCUC flag is set in the c_oflag field). Escape sequences are accepted on input, and generated on output, to handle certain ASCII characters not supported by older terminals (the XCASE flag is set in the c_lflag field).

    Other flags are directly mapped to flags in the termios structure:

    sg_flagsFlags in termios structure

    CBREAKComplement of ICANON in c_lflag field

    ECHO

    TANDEM

    Another structure associated with each terminal specifies characters that are special in both the old Version 7 and the newer 4BSD terminal interfaces. The following structure is defined by <sys/ttold.h>:

    struct   tchars   {
             char t_intrc;     /* interrupt */
             char t_quitc;     /* quit */
             char t_startc; /* start output */
             char t_stopc;     /* stop output */
             char t_eofc;        /* end-of-file */
             char t_brkc;        /* input delimiter (like nl) */
        };
    

    XENIX defines the tchar structure as tc. The characters are mapped to members of the c_cc field of the termios structure as follows:

           tchars                c_cc index
          t_intrc               VINTR
          t_quitc               VQUIT
          t_startc              VSTART
          t_stopc               VSTOP
          t_eofc                VEOF
          t_brkc                VEOL
    

    Also associated with each terminal is a local flag word (TIOCLSET and TIOCLGET), specifying flags supported by the new 4BSD terminal interface. Most of these flags are directly mapped to flags in the termios structure:

    Local flagsFlags in termios structure

    LCRTBSNot supported

    LPRTERA

    LCRTERA

    LTILDE

    LMDMBUF

    LTOSTOP

    LFLUSHO

    LNOHANG

    LCRTKIL

    LPASS8

    LCTLECH

    LPENDIN

    LDECCTQ

    LNOFLSH

    Each flag has a corresponding equivalent sg_flags value. The sg_flags definitions omit the leading "L"; for example, TIOCSETP with sg_flags set to TOSTOP is equivalent to TIOCLSET with LTOSTOP.

    Another structure associated with each terminal is the ltchars structure which defines control characters for the new 4BSD terminal interface. Its structure is:

    struct ltchars {
      char t_suspc;  /* stop process signal */
      char t_dsuspc; /* delayed stop process signal */
      char t_rprntc; /* reprint line */
      char t_flushc; /*flush output (toggles) */
      char t_werasc; /* word erase */
      char t_lnextc; /* literal next character */
    };
    

    The characters are mapped to members of the c_cc field of the termios structure as follows:

    ltcharsc_cc index

    t_suspc VSUS

    t_dsuspc

    t_rprntc

    t_flushc

    t_werasc

    t_lnextc

     

    IOCTLS

    ttcompat responds to the following ioctl calls. All others are passed to the module below.

    TIOCGETP

    The argument is a pointer to an sgttyb structure. The current terminal state is fetched; the appropriate characters in the terminal state are stored in that structure, as are the input and output speeds. If the speed is over B38400, then B38400 is returned. The values of the flags in the sg_flags field are derived from the flags in the terminal state and stored in the structure.

    TIOCEXCL

    Set ``exclusive-use'' mode; no further opens are permitted until the file has been closed.

    TIOCNXCL

    Turn off ``exclusive-use'' mode.

    TIOCSETP

    The argument is a pointer to an sgttyb structure. The appropriate characters and input and output speeds in the terminal state are set from the values in that structure, and the flags in the terminal state are set to match the values of the flags in the sg_flags field of that structure. The state is changed with a TCSETSF ioctl so that the interface delays until output is quiescent, then throws away any unread characters, before changing the modes. If the current device speed is over B38400 for either input or output speed, and B38400 is specified through this interface for that speed, the actual device speed is not changed. If the device speed is B38400 or lower or if some speed other than B38400 is specified, then the actual speed specified is set.

    TIOCSETN

    The argument is a pointer to an sgttyb structure. The terminal state is changed as TIOCSETP would change it, but a TCSETS ioctl is used, so that the interface neither delays nor discards input.

    TIOCHPCL

    The argument is ignored. The HUPCL flag is set in the c_cflag word of the terminal state.

    TIOCFLUSH

    The argument is a pointer to an int variable. If its value is zero, all characters waiting in input or output queues are flushed. Otherwise, the value of the int is treated as the logical OR of the FREAD and FWRITE flags defined by <sys/file.h>. If the FREAD bit is set, all characters waiting in input queues are flushed, and if the FWRITE bit is set, all characters waiting in output queues are flushed.

    TIOCSBRK

    The argument is ignored. The break bit is set for the device. (This is not supported by ttcompat. The underlying driver must support TIOCSBRK.)

    TIOCCBRK

    The argument is ignored. The break bit is cleared for the device. (This is not supported by ttcompat. The underlying driver must support TIOCCBRK.)

    TIOCSDTR

    The argument is ignored. The Data Terminal Ready bit is set for the device.

    TIOCCDTR

    The argument is ignored. The Data Terminal Ready bit is cleared for the device.

    TIOCSTOP

    The argument is ignored. Output is stopped as if the STOP character had been typed.

    TIOCSTART

    The argument is ignored. Output is restarted as if the START character had been typed.

    TIOCGETC

    The argument is a pointer to a tchars structure. The current terminal state is fetched, and the appropriate characters in the terminal state are stored in that structure.

    TIOCSETC

    The argument is a pointer to a tchars structure. The values of the appropriate characters in the terminal state are set from the characters in that structure.

    TIOCLGET

    The argument is a pointer to an int. The current terminal state is fetched, and the values of the local flags are derived from the flags in the terminal state and stored in the int pointed to by the argument.

    TIOCLBIS

    The argument is a pointer to an int whose value is a mask containing flags to be set in the local flags word. The current terminal state is fetched, and the values of the local flags are derived from the flags in the terminal state; the specified flags are set, and the flags in the terminal state are set to match the new value of the local flags word.

    TIOCLBIC

    The argument is a pointer to an int whose value is a mask containing flags to be cleared in the local flags word. The current terminal state is fetched, and the values of the local flags are derived from the flags in the terminal state; the specified flags are cleared, and the flags in the terminal state are set to match the new value of the local flags word.

    TIOCLSET

    The argument is a pointer to an int containing a new set of local flags. The flags in the terminal state are set to match the new value of the local flags word. (This ioctl was added because sg_flags was once a 16 bit value. The local modes controlled by TIOCLSET are equivalent to the modes controlled by TIOCSETP and sg_flags.)

    TIOCGLTC

    The argument is a pointer to an ltchars structure. The values of the appropriate characters in the terminal state are stored in that structure.

    TIOCSLTC

    The argument is a pointer to an ltchars structure. The values of the appropriate characters in the terminal state are set from the characters in that structure.

    FIORDCHK

    Returns the number of immediately readable characters. The argument is ignored. (This ioctl is handled in the stream head, not in the ttcompat module.)

    FIONREAD

    Returns the number of immediately readable characters in the int pointed to by the argument. (This ioctl is handled in the stream head, not in the ttcompat module.)

    The following ioctls are returned as successful for the sake of compatibility. However, nothing significant is done (that is, the state of the terminal is not changed in any way, and no message is passed through to the underlying tty driver).

             
    DIOCSETP
    DIOCSETP
    DIOCGETP
    LDCLOSE  
    LDCHG
    LDOPEN
    LDGETT
    LDSETT
    TIOCGETD
    TIOCSETD
    

    The following old ioctls are not supported by ttcompat, but are supported by Solaris tty drivers. As with all ioctl not otherwise listed in this documentation, these are passed through to the underlying driver and are handled there.

    TIOCREMOTE
    TIOCGWINSZ 
    TIOCSWINSZ
    

    The following ioctls are not supported by ttcompat, and are generally not supported by Solaris tty drivers. They are passed through, and the tty drivers return EINVAL.

    LDSMAP
    LDGMAP 
    LDNMAP
    TIOCNOTTY
    TIOCOUTQ
    

    (Note: LDSMAP, LDGMAP, and LDNMAP are defined in <sys/termios.h>.)  

    SEE ALSO

    ioctl(2), termios(3C), ldterm(7M), termio(7I)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    IOCTLS
    SEE ALSO


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