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41 .Nd pseudo-terminal access functions
47 .Fn grantpt "int fildes"
49 .Fn ptsname "int fildes"
51 .Fn unlockpt "int fildes"
58 functions allow access to pseudo-terminal devices.
59 These three functions accept a file descriptor that references the
60 master half of a pseudo-terminal pair.
61 This file descriptor is created with
66 function is used to establish ownership and permissions
67 of the slave device counterpart to the master device
70 The slave device's ownership is set to the real user ID
71 of the calling process, and the permissions are set to
72 user readable-writable and group writable.
73 The group owner of the slave device is also set to the
79 function returns the full pathname of the slave device
80 counterpart to the master device specified with
82 This value can be used
83 to subsequently open the appropriate slave after
91 function clears the lock held on the pseudo-terminal pair
92 for the master device specified with
95 .Rv -std grantpt unlockpt
99 function returns a pointer to the name
100 of the slave device on success; otherwise a
109 functions may fail and set
115 is not a valid open file descriptor.
118 is not a master pseudo-terminal device.
128 The slave pseudo-terminal device could not be accessed.
140 This implementation of
146 because it depends on
148 to create the pseudo-terminal device with proper permissions in place.
149 It only validates whether
151 is a valid pseudo-terminal master device.
152 Future revisions of the specification will likely allow this behaviour,
153 as stated by the Austin Group.
160 functions appeared in