| pty.4 (fbf9b468d53247972564d3f3ec52b213156a3e94) | pty.4 (81ae4b8da9920ccfb697984dbb2e8751573d183a) |
|---|---|
| 1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 163 unchanged lines hidden (view full) --- 172is a no-op that may be used to probe for 173the existence of this facility. 174As with 175.Dv TIOCPKT 176mode, command operations may be detected with a 177.Xr select 2 178for exceptional conditions. 179.El | 1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 163 unchanged lines hidden (view full) --- 172is a no-op that may be used to probe for 173the existence of this facility. 174As with 175.Dv TIOCPKT 176mode, command operations may be detected with a 177.Xr select 2 178for exceptional conditions. 179.El |
| 180 181There is currently two pty systems available : the original BSD pty, and a | 180.Pp 181There is currently two 182.Nm 183systems available: the original 184.Bx Nm , 185and a |
| 182SysVR4 pts-like implementation. | 186SysVR4 pts-like implementation. |
| 183You can switch between the two implementations by setting the | 187It is possible to switch between the two implementations by setting the |
| 184.Va kern.pts.enable | 188.Va kern.pts.enable |
| 185sysctl. Setting it to 0 will use the BSD pty, to non-zero the pts 186implementation. It defaults to 0. 187You can set the maximum number of ptys which can be allocated at the same time 188with the | 189sysctl. 190Setting it to 0 will use the 191.Bx Nm , 192to non-zero the pts implementation. 193It defaults to 0. 194It is possible to set the maximum number of ptys 195which can be allocated at the same time with the |
| 189.Va kern.pts.max | 196.Va kern.pts.max |
| 190sysctl. It defaults to 1000. | 197sysctl. 198It defaults to 1000. |
| 191It is not recommanded to use more than 1000 pseudo-terminals, as all software 192which use 193.Xr utmp 5 194will not be able to handle pseudo-terminals with number superior to 999. | 199It is not recommanded to use more than 1000 pseudo-terminals, as all software 200which use 201.Xr utmp 5 202will not be able to handle pseudo-terminals with number superior to 999. |
| 195 196The pts implementation also supports the | 203.Pp 204The pts implementation also supports the |
| 197.Dv TIOCGPTN 198.Xr ioctl 2 | 205.Dv TIOCGPTN 206.Xr ioctl 2 |
| 199call, which takes a pointer to an unsigned int as a parameter and provides the | 207call, which takes a pointer to an 208.Vt "unsigned int" 209as a parameter and provides the |
| 200number of the pty. | 210number of the pty. |
| 201 | |
| 202.Sh FILES | 211.Sh FILES |
| 203.Bl -tag -width /dev/tty[p-sP-S][0-9a-v]x -compact 204The files used by the BSD pseudo terminals implementation are : | 212The files used by the 213.Bx 214pseudo terminals implementation are: 215.Pp 216.Bl -tag -width ".Pa /dev/tty[p-sP-S][0-9a-v]" -compact |
| 205.It Pa /dev/pty[p-sP-S][0-9a-v] 206master pseudo terminals 207.It Pa /dev/tty[p-sP-S][0-9a-v] 208slave pseudo terminals | 217.It Pa /dev/pty[p-sP-S][0-9a-v] 218master pseudo terminals 219.It Pa /dev/tty[p-sP-S][0-9a-v] 220slave pseudo terminals |
| 209 | |
| 210.El | 221.El |
| 211The files used by the pts implementation are : 212.Bl -tag -width /dev/pts/[num]x -compact | 222.Pp 223The files used by the pts implementation are: 224.Pp 225.Bl -tag -width ".Pa /dev/pts/[num]" -compact |
| 213.It Pa /dev/ptmx 214control device, returns a file descriptor to a new master pseudo terminal 215when opened. 216.It Pa /dev/pty[num] 217master pseudo terminals 218.It Pa /dev/pts/[num] 219slave pseudo terminals 220.El 221.Sh DIAGNOSTICS 222None. 223.Sh SEE ALSO 224.Xr tty 4 225.Sh HISTORY 226The 227.Nm 228driver appeared in 229.Bx 4.2 . | 226.It Pa /dev/ptmx 227control device, returns a file descriptor to a new master pseudo terminal 228when opened. 229.It Pa /dev/pty[num] 230master pseudo terminals 231.It Pa /dev/pts/[num] 232slave pseudo terminals 233.El 234.Sh DIAGNOSTICS 235None. 236.Sh SEE ALSO 237.Xr tty 4 238.Sh HISTORY 239The 240.Nm 241driver appeared in 242.Bx 4.2 . |