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Add a PTY multiplexer (/dev/ptmx) device.

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When you open /dev/ptmx, you get a file descriptor pointing to one of the
available MasterPTY's. If none are available, you get an EBUSY.

This makes it possible to open multiple (up to 4) Terminals. :^)

To support this, I also added a CharacterDevice::open() that gets control
when VFS is opening a CharacterDevice. This is useful when we want to return
a custom FileDescriptor like we do here.
This commit is contained in:
Andreas Kling 2019-01-16 13:36:10 +01:00
parent b46ae2bf09
commit 9dd29f9aa9
13 changed files with 75 additions and 37 deletions
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1
Kernel/sync.sh
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@ -9,6 +9,7 @@ mknod mnt/dev/tty1 c 4 1
mknod mnt/dev/tty2 c 4 2
mknod mnt/dev/tty3 c 4 3
mknod mnt/dev/psaux c 10 1
mknod mnt/dev/ptmx c 5 2
mknod mnt/dev/ptm0 c 10 0
mknod mnt/dev/ptm1 c 10 1
mknod mnt/dev/ptm2 c 10 2