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PTM(4)			 BSD Kernel Interfaces Manual			PTM(4)

NAME
     ptm — pseudo-terminal multiplexor device

SYNOPSIS
     pseudo-device pty [count]

DESCRIPTION
     The ptm driver is the backend for the /dev/ptm device.  It supports three
     ioctl(2)s.	 The first is TIOCPTMGET, which allocates a free pseudo-termi‐
     nal device, sets its user ID to the calling user, revoke(2)s it, and
     returns the opened file descriptors for both the master and the slave
     pseudo-terminal device to the caller in a struct ptmget.  This struct has
     the following content:

	   struct ptmget {
		   int	   cfd;
		   int	   sfd;
		   char	   cn[16];
		   char	   sn[16];
	   };

     where cfd and sfd contain the master resp. slave device's file descriptor
     and cn and sn the corresponding paths in the file system.

     The /dev/ptmx device supports two more ioctl(2)s, TIOCGRANTPT, which is
     used by grantpt(3), TIOCPTSNAME, which is used by ptsname(3).

     The ptm device is included with the pseudo-device pty(4).	It can be dis‐
     abled by adding “options NO_DEV_PTM” to the kernel configuration.

FILES
     /dev/ptm			       ptm access device

     /dev/ptmx			       ptm cloning device, used to implement
				       Unix98 ptys

SEE ALSO
     grantpt(3), openpty(3), posix_openpt(3), ptsname(3), unlockpt(3), pty(4)

HISTORY
     The /dev/ptm device appeared in OpenBSD 3.5 and was ported to NetBSD 3.0.

BSD			       November 12, 2005			   BSD

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