| PTM(4) | Device Drivers Manual | PTM(4) |
ptm —
pseudo-device pty
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 following content:
struct ptmget {
int cfd;
int sfd;
char cn[PATH_MAX];
char sn[PATH_MAX];
};
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.
ptm access deviceptm cloning device, used to implement Unix98
ptys| November 30, 2013 | NetBSD 10.1 |