Adaptec AHA-1520A Wartungshandbuch PDF herunterladen (Seite 360)

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101

termio(7I) Ioctl Requests SunOS 5.5

CBAUDEXT Bit to indicate output speed > B38400

CIBAUDEXTBit to indicate input speed > B38400

The CBAUD bits together with the CBAUDEXT bit specify the output baud rate. To

retrieve the output speed from the termios structure pointed to by termios_p see the fol-

lowing code segment.

unsigned long ospeed;

if (termios_p->c_cﬂag & CBAUDEXT)

ospeed = (termios_p->c_cﬂag & CBAUD) + CBAUD + 1;

else

ospeed = termios_p->c_cﬂag & CBAUD;

To store the output speed in the termios structure pointed to by termios_p see the follow-

ing code segment.

unsigned long ospeed;

if (ospeed > CBAUD) {

termios_p->c_cﬂag |= CBAUDEXT;

ospeed -= (CBAUD + 1);

} else

termios_p->c_cﬂag &= ˜CBAUDEXT;

termios_p->c_cﬂag =

(termios_p->c_cﬂag & ˜CBAUD) | (ospeed & CBAUD);

The zero baud rate, B0, is used to hang up the connection. If B0 is speciﬁed, the data-

terminal-ready signal is not asserted. Normally, this disconnects the line.

If the CIBAUDEXT or CIBAUD bits are not zero, they specify the input baud rate, with

the CBAUDEXT and CBAUD bits specifying the output baud rate; otherwise, the output

and input baud rates are both speciﬁed by the CBAUDEXT and CBAUD bits. The values

for the CIBAUD bits are the same as the values for the CBAUD bits, shifted left IBSHIFT

bits. For any particular hardware, impossible speed changesare ignored. To retrieve the

input speed in the termios structure pointed to by termios_p see the following code seg-

ment.

unsigned long ispeed;

if (termios_p->c_cﬂag & CIBAUDEXT)

ispeed = ((termios_p->c_cﬂag & CIBAUD) >> IBSHIFT)

+ (CIBAUD >> IBSHIFT) + 1;

else

ispeed = (termios_p->c_cﬂag & CIBAUD) >> IBSHIFT;

7I-356 modiﬁed 30 May 1995

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