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Handle sigchld instead of blocking on waitpid

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This stops any potential blocking when killing swaybg (e.g. reloading
config). We also forcefully close their wayland connection, in case
they're slow to die and we start a new swaybg.
This commit is contained in:
Scott Anderson 2018-10-28 23:28:58 +13:00
parent 2ccf511cba
commit a13c8efdcd
4 changed files with 32 additions and 11 deletions
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2
include/sway/config.h
View file

@ -535,8 +535,6 @@ void load_swaybar(struct bar_config *bar);
void load_swaybars(void);
void terminate_swaybg(pid_t pid);
struct bar_config *default_bar_config(void);
void free_bar_config(struct bar_config *bar);

2
include/sway/server.h
View file

@ -23,6 +23,8 @@ struct sway_server {
struct wl_event_loop *wl_event_loop;
const char *socket;
struct wl_event_source *sigchld_source;
struct wlr_backend *backend;
struct wlr_compositor *compositor;

26
sway/config/output.c
View file

@ -164,23 +164,31 @@ static void set_mode(struct wlr_output *output, int width, int height,
}
}
void terminate_swaybg(pid_t pid) {
int ret = kill(pid, SIGTERM);
if (ret != 0) {
wlr_log(WLR_ERROR, "Unable to terminate swaybg [pid: %d]", pid);
} else {
int status;
waitpid(pid, &status, 0);
static void terminate_swaybg(struct wl_display *display, pid_t pid) {
struct wl_client *client;
wl_client_for_each(client, wl_display_get_client_list(display)) {
pid_t p;
wl_client_get_credentials(client, &p, NULL, NULL);
if (p == pid) {
wl_client_destroy(client);
break;
}
}
if (kill(pid, SIGTERM) != 0) {
wlr_log_errno(WLR_ERROR, "Unable to terminate swaybg [pid: %d]", (int)pid);
}
}
void apply_output_config(struct output_config *oc, struct sway_output *output) {
struct wlr_output *wlr_output = output->wlr_output;
struct wl_display *display = output->server->wl_display;
if (oc && oc->enabled == 0) {
if (output->enabled) {
if (output->bg_pid != 0) {
terminate_swaybg(output->bg_pid);
terminate_swaybg(display, output->bg_pid);
output->bg_pid = 0;
}
output_disable(output);
@ -230,7 +238,7 @@ void apply_output_config(struct output_config *oc, struct sway_output *output) {
}
if (output->bg_pid != 0) {
terminate_swaybg(output->bg_pid);
terminate_swaybg(display, output->bg_pid);
}
if (oc && oc->background && config->swaybg_command) {
wlr_log(WLR_DEBUG, "Setting background for output %d to %s",

13
sway/server.c
View file

@ -1,7 +1,9 @@
#define _POSIX_C_SOURCE 200112L
#include <assert.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <wayland-server.h>
#include <wlr/backend.h>
#include <wlr/backend/session.h>
@ -30,6 +32,14 @@
#include "sway/xwayland.h"
#endif
static int sigchld_handler(int signum, void *data) {
while (waitpid(0, NULL, WNOHANG) > 0) {
// Do nothing
}
return 0;
}
bool server_privileged_prepare(struct sway_server *server) {
wlr_log(WLR_DEBUG, "Preparing Wayland server initialization");
server->wl_display = wl_display_create();
@ -83,6 +93,9 @@ bool server_init(struct sway_server *server) {
&server->xdg_shell_surface);
server->xdg_shell_surface.notify = handle_xdg_shell_surface;
server->sigchld_source = wl_event_loop_add_signal(server->wl_event_loop,
SIGCHLD, sigchld_handler, NULL);
// TODO: configurable cursor theme and size
int cursor_size = 24;
const char *cursor_theme = NULL;