On Mon, Jan 17, 2022 at 08:42:57PM -0800, Walt Drummond wrote: > This patchset adds TTY status message request feature to the n_tty > line dicipline. This feature prints a brief message containing basic > system and process group information to a user's TTY in response to a > new control character in the line dicipline (default Ctrl-T) or the > TIOCSTAT ioctl. The message contains the current system load, the > name and PID of an interesting process in the forground process group, > it's run time, percent CPU usage and RSS. An example of this message > is: > > load: 0.31 cmd: sleep 3616843 [sleeping] 0.36r 0.00u 0.00s 0% 696k > > User API visible changes are limited to: > - The addition of VSTATUS in termios.c_cc[] > - The addition of NOKERNINFO bit in termios.l_cflags > - The addition of the TIOCSTAT ioctl number > > None of these changes break the existing kernel api as the termios > structure on all architectures has enough space in the control > character array (.c_cc) for the new character, and the other changes > are space agnostic. > > This feature is in many other Unix-like systems, both current and > historical. In other implementations, this feature would also send > SIGINFO to the process group; this implementation does not. > > Walt Drummond (3): > vstatus: Allow the n_tty line dicipline to write to a user tty > vstatus: Add user space API definitions for VSTATUS, NOKERNINFO and > TIOCSTAT > status: Display an informational message when the VSTATUS character is > pressed or TIOCSTAT ioctl is called. > > arch/alpha/include/asm/termios.h | 4 +- > arch/alpha/include/uapi/asm/ioctls.h | 1 + > arch/alpha/include/uapi/asm/termbits.h | 34 ++--- > arch/ia64/include/asm/termios.h | 4 +- > arch/ia64/include/uapi/asm/termbits.h | 34 ++--- > arch/mips/include/asm/termios.h | 4 +- > arch/mips/include/uapi/asm/ioctls.h | 1 + > arch/mips/include/uapi/asm/termbits.h | 36 ++--- > arch/parisc/include/asm/termios.h | 4 +- > arch/parisc/include/uapi/asm/ioctls.h | 1 + > arch/parisc/include/uapi/asm/termbits.h | 34 ++--- > arch/powerpc/include/asm/termios.h | 4 +- > arch/powerpc/include/uapi/asm/ioctls.h | 2 + > arch/powerpc/include/uapi/asm/termbits.h | 34 ++--- > arch/s390/include/asm/termios.h | 4 +- > arch/sh/include/uapi/asm/ioctls.h | 1 + > arch/sparc/include/uapi/asm/ioctls.h | 1 + > arch/sparc/include/uapi/asm/termbits.h | 38 +++--- > arch/xtensa/include/uapi/asm/ioctls.h | 1 + > drivers/tty/Makefile | 2 +- > drivers/tty/n_tty.c | 113 +++++++++++----- > drivers/tty/n_tty_status.c | 162 +++++++++++++++++++++++ > drivers/tty/tty_io.c | 2 +- > include/asm-generic/termios.h | 4 +- > include/linux/tty.h | 123 ++++++++--------- > include/uapi/asm-generic/ioctls.h | 1 + > include/uapi/asm-generic/termbits.h | 34 ++--- > 27 files changed, 461 insertions(+), 222 deletions(-) > create mode 100644 drivers/tty/n_tty_status.c > > -- > 2.30.2 > You forgot to cc: me on patch 2/3, which would be needed if I was to take them all. Please fix up patch 2 and resend the whole series. thanks, greg k-h
