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Add -S|--session <command> option

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...to start <command> on startup and to terminate the compositor when
<command> exits.

This is useful for session management as it allows the session client (for
example `lxqt-session`) to terminate labwc - be exiting itself.

Under X, xinit starts the server and keeps it alive for as long as
lxqt-session runs. Thus either the session client starts the Window
Manager, or the Window Manager can be launched independently first.  On
Wayland, the Compositor is both Display Server and Window Manager, so the
described session management mechanisms do not work because the Compositor
needs to be running before the session can function.

As some session clients support both X11 and Wayland, this command line
option avoids re-writes and fragmentation.

Co-authored-by: @Consolatis
This commit is contained in:
Johan Malm 2024-03-09 17:12:54 +00:00 • committed by Consolatis
parent 55138dbe0e
commit c841a25acf
6 changed files with 95 additions and 5 deletions
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50
src/common/spawn.c
View file

@ -25,11 +25,22 @@ reset_signals_and_limits(void)
signal(SIGPIPE, SIG_DFL);
}
static void
static bool
set_cloexec(int fd)
{
int flags = fcntl(fd, F_GETFD);
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
if (flags == -1) {
wlr_log_errno(WLR_ERROR,
"Unable to set the CLOEXEC flag: fnctl failed");
return false;
}
flags = flags | FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags) == -1) {
wlr_log_errno(WLR_ERROR,
"Unable to set the CLOEXEC flag: fnctl failed");
return false;
}
return true;
}
void
@ -79,6 +90,41 @@ out:
g_strfreev(argv);
}
pid_t
spawn_primary_client(const char *command)
{
assert(command);
GError *err = NULL;
gchar **argv = NULL;
/* Use glib's shell-parse to mimic Openbox's behaviour */
g_shell_parse_argv((gchar *)command, NULL, &argv, &err);
if (err) {
g_message("%s", err->message);
g_error_free(err);
return -1;
}
pid_t child = fork();
switch (child) {
case -1:
wlr_log_errno(WLR_ERROR, "Failed to fork");
g_strfreev(argv);
return -1;
case 0:
/* child */
close(STDIN_FILENO);
reset_signals_and_limits();
execvp(argv[0], argv);
wlr_log_errno(WLR_ERROR, "Failed to execute primary client %s", command);
_exit(1);
default:
g_strfreev(argv);
return child;
}
}
pid_t
spawn_piped(const char *command, int *pipe_fd)
{