CFSETISPEED(3)                       BSD                        CFSETISPEED(3)



NAME
     cfsetispeed  - Set input baud rate

SYNOPSIS
     #include <termios.h>

     int cfsetispeed (termios_p, speed )
     const struct termios *termios_p;
     speed_t speed;

DESCRIPTION
     The cfsetispeed function sets the input baud rate stored in the structure
     pointed to by termios_p to the value specified by speed.

     Attempts to set unsupported baud rates will be ignored. This refers both
     to changes to baud rates not supported by the hardware and to changes
     setting the input and output baud rates to different values if the
     hardware does not support this.  There is no effect on the baud rates set
     in the hardware until a subsequent successful call to the tcsetattr(3)
     function on the same termios structure.

     The  following standard baud rates can be specified with this call:

     B0        Hangs up. The zero baud rate is used to hang up the connection.
               If B0 is specified, the `data terminal ready' signal is not
               asserted. Normally, this disconnects the line.

     B50       50 baud.

     B75       75 baud.

     B110      110 baud.

     B134      134.5 baud.

     B150      150 baud.

     B200      200 baud.

     B300      300 baud.

     B600      600 baud.

     B1200     1200 baud.

     B1800     1800 baud.

     B2400     2400 baud.

     B4800     4800 baud.

     B9600     9600 baud.

     B19200    19200 baud.

     B38400    38400 baud.

     Domain/OS also supports non-standard baud rates which should not be used
     when writing portable software. Node types that support the non-standard
     baud rates are as follows:

          On node model numbers DN4000, DN4500, DN3000 DN3500, DN10000, and
          DN5500, the non-standard baud rate of 7,200 is supported.

          On node model numbers DN2500, and Series 400, 425, 433, the non-
          standard baud rates of 3,600 and 7,200 are supported.

NOTES
     There is a restriction in setting baud rates for "partner" serial I/O
     (SIO) lines on nodes that support ports for two SIO lines. The node model
     numbers are:  DN3500, DN4000, DN4500, DN5500, DN10000.

     Each port supports a specified set baud rates; some baud rates are common
     to both ports. The following table lists the baud rates that can be set
     for for ports 2 and 3 of the specified node types.

                                Column1     Column2
                                ___________________
                                50          75
                                110         110
                                134.5       134.5
                                200         150
                                300         300
                                600         600
                                1,200       1,200
                                1,050       2,000
                                2,400       2,400
                                4,800       4,800
                                7,200       1,800
                                9,600       9,600
                                38.4k       19.2k

     POSIX requires that the baud rates for the two lines be compatible. Thus,
     for example, if the SIO line in port 2 is set to a baud rate of 50, the
     selection of acceptable baud rates for the "partner" SIO line in port 3
     is limited to those listed in in column 1.

     On the other hand, if port 2 is set to a baud rate of 1,200, port 3 can
     be set to any baud rate in either column since 1,200 is compatible with
     both lines (appears in both columns).

     Note that the non-standard baud rate of 3,600 is unsupported for these
     configurations.

DIAGNOSTICS
     The cfsetispeed function returns a value of 0 (zero); otherwise, a value
     of -1 is returned.

SEE ALSO
     cfgetispeed(3), cfgetospeed(3), cfsetospeed(3), tcsetattr(3) termios(4)