Bug 229107
| Summary: | [Linuxulator]: linprocfs: implement /dev/tty/drivers | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Ed Maste <emaste> |
| Component: | kern | Assignee: | freebsd-emulation (Nobody) <emulation> |
| Status: | New --- | ||
| Severity: | Affects Only Me | CC: | chuck, dchagin, trasz |
| Priority: | --- | ||
| Version: | CURRENT | ||
| Hardware: | Any | ||
| OS: | Any | ||
| Bug Depends on: | |||
| Bug Blocks: | 247219 | ||
With recent fixes the ps(1) output seems normal, in particular the pty-s are displayed correctly. Does the lack of this file actually break anything? I don't recall now what problem I ran into that prompted this PR - I'll try to take another look. |
On Gentoo "Linux (none) 4.14.33-v8-0a76b56e61cf+ #1 SMP PREEMPT Wed Apr 11 11:36:25 BST 2018 aarch64 GNU/Linux" on RPi 3B+ /proc/tty/drivers contains: /dev/tty /dev/tty 5 0 system:/dev/tty /dev/console /dev/console 5 1 system:console /dev/ptmx /dev/ptmx 5 2 system /dev/vc/0 /dev/vc/0 4 0 system:vtmaster ttyAMA /dev/ttyAMA 204 64-77 serial ttyprintk /dev/ttyprintk 5 3 console pty_slave /dev/pts 136 0-1048575 pty:slave pty_master /dev/ptm 128 0-1048575 pty:master unknown /dev/tty 4 1-63 console This seems to be accessed by some common startup code - e.g., invoking bin/ps reads from /proc/tty/drivers. strace on Linus shows: openat(AT_FDCWD, "/proc/tty/drivers", O_RDONLY) = 6 read(6, "/dev/tty /dev/tty "..., 9999) = 521 close(6) = 0 newfstatat(AT_FDCWD, "/dev/pts0", 0x7ff7270018, 0) = -1 ENOENT (No such file or directory) newfstatat(AT_FDCWD, "/dev/pts/0", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}, 0) = 0 openat(AT_FDCWD, "/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 6 fstat(6, {st_mode=S_IFREG|0644, st_size=26244, ...}) = 0 mmap(NULL, 26244, PROT_READ, MAP_SHARED, 6, 0) = 0x7f90e6a000 close(6) = 0 newfstatat(AT_FDCWD, "/proc/946", {st_mode=S_IFDIR|0555, st_size=0, ...}, 0) = 0 openat(AT_FDCWD, "/proc/946/stat", O_RDONLY) = 6 read(6, "946 (kworker/3:2) I 2 0 0 0 -1 6"..., 1024) = 160 close(6) = 0 ... Linux bin/ps under arm64 Linuxulator: 649 ps CALL linux_openat(0xffffffffffffff9c,0x40164a78,0,0) 649 ps NAMI "/compat/linux/proc/tty/drivers" 649 ps NAMI "/proc/tty/drivers" 649 ps RET linux_openat -1 errno -2 No such file or directory