Re: Unix98 PTYs + DevFS + Glibc 2.0.96

Zack Weinberg (zack@rabi.columbia.edu)
Fri, 02 Oct 1998 20:23:58 -0400

Clifford Wolf wrote:
>1: open /dev/ptmx
>2: ioctl TIOCGPTN the fd from 1: to get the pty number
>3: open /dev/ptm/<pty-number> to use it as master
>4: open /dev/pts/<pty-number> tu use it as slave
>5: close the fd from 1:

This is incorrect. The fd returned by the open() of /dev/ptmx is
supposed to be the pty master. The conventional-device implementation
gets it right; the bug is in devfs.

Richard: please fix devfs. There should be no /dev/ptm directory, and
opening /dev/ptmx should get you a pty master. See the Unix98
standard (available somewhere at xopen.org).

zw

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