function changes the mode and owner of the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by
The user ID of the slave is set to the real UID of the calling process.
The group ID is set to an unspecified value (e.g.,
The mode of the slave is set to 0620 (crw--w----).
The behavior of
is unspecified if a signal handler is installed to catch
Otherwise, it returns -1 and sets
The corresponding slave pseudoterminal could not be accessed.
argument is not a valid open file descriptor.
argument is valid but not associated with a master pseudoterminal.
is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see
This is part of the UNIX 98 pseudoterminal support, see
Many systems implement this function via a set-user-ID helper binary
With Linux devpts no such helper binary is required.
This page is part of release 4.04 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at