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NetBSD 6.1.5 - man page for ptm (netbsd section 4)

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-terminal 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 fol-
     lowing 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 disabled 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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