> From: Riza Dindir <riza.din...@gmail.com> > Date: Sat, 7 Sep 2024 15:37:17 +0300 > > I am running Linux with kernel 6.6.47 and am running emacs in xterm, using > the -nw command line argument. > > I am new to emacs and was experimenting with the suspend-emacs command. > Following the example on > https://www.gnu.org/software/emacs/manual/html_node/elisp/Suspending-Emacs.html. > > When following the example, I added the suspend-resume-hook to my > .emacs.d/init.el file. When I run M-: > (suspend-emacs "pwd") it does not show the current working directory. But > when I do fg from the terminal that I > got into, I see the "Resumed!" message. > > I asked in the libera chat about that, and also in the gnu-help-emacs list. I > have been talking to wasamasa on > libera chat (#emacs-beginners) and we pinpointed the problem to the > stuff_char function (in > https://git.savannah.gnu.org/cgit/emacs.git/tree/src/sysdep.c#n403). We came > to this point from > stuff_buffered_input > (https://git.savannah.gnu.org/cgit/emacs.git/tree/src/keyboard.c#n11963), and > from > suspend-emacs function definition (in > https://git.savannah.gnu.org/cgit/emacs.git/tree/src/keyboard.c#n11908). > > The stuff_char function is using ioctl with TIOCSTI. TIOCSTI requires > CAP_SYS_ADMIN capability. You can set > this capability using sysctl setting dev.tty.legacy_tiocsti to 1. > > Unless I had set "dev.tty.legacy_tiocsti" to 1 I could not run the > suspend-emacs command with an argument > string. > > Either emacs can check the return value of ioctl in stuff_char and if there > return value is EPERM, then handle > this accordingly, with a message regarding the problem.
You mean, you want suspend-emacs signal an error if it is called with STUFFSTRING argument, but fails to stuff the string into the terminal's input buffer?
