projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8e9003a9 AC |
1 | .Dd December 10, 1993 |
| 2 | .Dt COMCONTROL 8 | |
| 3 | .Os FreeBSD | |
| 4 | .Sh NAME | |
| 5 | .Nm comcontrol | |
| 6 | .Nd "control the bidirectional status of a sio port and waiting time after DTR drop" | |
| 7 | .Sh SYNOPSIS | |
| 8 | .Nm comcontrol | |
| 9 | .Ar sio_special_device | |
| 10 | .Op Cm bidir | Fl bidir | |
| 11 | .Op Cm dtrwait Ar ticks | |
| 12 | .Sh DESCRIPTION | |
| 13 | .Nm Comcontrol | |
| 14 | is used to examine and modify the bidirectional status | |
| 15 | of a specified | |
| 16 | sio communications port | |
| 17 | and its waiting time after DTR drop. | |
| 18 | By default (if | |
| 19 | .Ar sio_special_device | |
| 20 | only specified), | |
| 21 | .Nm comcontrol | |
| 22 | will print the current port state | |
| 23 | (if kernel was built with | |
| 24 | .Cm options COM_BIDIR ) | |
| 25 | as either | |
| 26 | .Cm bidir | |
| 27 | to indicate that bidirectional operation is enabled or | |
| 28 | .Fl bidir | |
| 29 | to indicate that it is disabled, string | |
| 30 | .Cm dtrwait | |
| 31 | and current waiting time in ticks | |
| 32 | after DTR drop. | |
| 33 | To modify the status of the port or waiting time, simply | |
| 34 | specify the desired new state | |
| 35 | and/or new waiting time | |
| 36 | on the command line. All users with | |
| 37 | read access to the | |
| 38 | .Ar sio_special_device | |
| 39 | can use | |
| 40 | .Nm comcontrol | |
| 41 | to get the port's status and current waiting time. | |
| 42 | Only root can set a port's status and waiting time. | |
| 48388619 AC |
43 | By default, each port is initially unidirectional, waiting time is |
| 44 | 2 seconds. | |
| 8e9003a9 AC |
45 | .Pp |
| 46 | The standard way to use | |
| 47 | .Nm comcontrol | |
| 48 | is to put invocations of it in the | |
| 49 | .Ar /etc/rc.local | |
| 50 | startup script. | |
| 51 | .Sh SEE ALSO | |
| 52 | .Xr sio 4 | |
| 53 | .Sh FILES | |
| 54 | .Bl -tag -width Pa | |
| f4ba0bba | 55 | .It Pa /dev/ttyd? |
| 8e9003a9 AC |
56 | .Sh DIAGNOSTICS |
| 57 | .Cm TIOCMSBIDIR: Inappropriate ioctl for device. | |
| 58 | .Pp | |
| 59 | This indicates attempt to change port status on | |
| 60 | a non-sio special device file, | |
| 61 | or the kernel has not been built with | |
| 62 | .Cm options COM_BIDIR . | |
| 63 | For more information concerning reconfiguration | |
| 64 | of your kernel see | |
| 65 | .Ar /usr/src/sys/i386/doc/config_options.doc. | |
| 66 | .Sh AUTHOR | |
| 67 | Christopher G. Demetriou | |
| 68 | .Sh BUGS | |
| 69 | It is strongly recommended that you do *not* | |
| 70 | change the bidirectional status of a port while there are programs | |
| 71 | using the port. Read that as: if you do, and it breaks, don't yell | |
| 72 | at me; that's a really weird thing to do. | |
| 73 | .Sh HISTORY | |
| 74 | Originally part of cgd's com package patches, version 0.2.1, to 386BSD 0.1. |