terminal: call user-defined callback when destroying terminal

main uses this to get the exit code of the terminal.

main.c

@@ -26,14 +26,27 @@
 static void
 print_usage(const char *prog_name)
 {
-    printf("Usage: %s [OPTION]...\n", prog_name);
+    printf("Usage: %s [OPTIONS]...\n", prog_name);
     printf("\n");
     printf("Options:\n");
     printf("  -f,--font=FONT              comma separated list of fonts in fontconfig format (monospace)\n"
            "  -t,--term=TERM              value to set the environment variable TERM to (foot)\n"
            "  -g,--geometry=WIDTHxHEIGHT  set initial width and height\n"
+           "  -s,--server                 run as a server\n"
            "  -v,--version                show the version number and quit\n");
-    printf("\n");
+}
+
+struct shutdown_context {
+    struct terminal **term;
+    int exit_code;
+};
+
+static void
+term_shutdown_cb(void *data, int exit_code)
+{
+    struct shutdown_context *ctx = data;
+    *ctx->term = NULL;
+    ctx->exit_code = exit_code;
 }
 
 int
@@ -136,6 +149,7 @@ main(int argc, char *const *argv)
     struct fdm *fdm = NULL;
     struct wayland *wayl = NULL;
     struct terminal *term = NULL;
+    struct shutdown_context shutdown_ctx = {.term = &term, .exit_code = EXIT_FAILURE};
 
     if ((fdm = fdm_init()) == NULL)
         goto out;
@@ -143,7 +157,10 @@ main(int argc, char *const *argv)
     if ((wayl = wayl_init(fdm)) == NULL)
         goto out;
 
-    if ((term = term_init(&conf, fdm, wayl, argc, argv)) == NULL)
+    if (!as_server && (term = term_init(&conf, fdm, wayl, argc, argv,
+                                        &term_shutdown_cb, &shutdown_ctx)) == NULL)
+        goto out;
+
         goto out;
 
     while (tll_length(wayl->terms) > 0) {
@@ -157,15 +174,11 @@ main(int argc, char *const *argv)
 out:
     shm_fini();
 
-    tll_foreach(wayl->terms, it)
+    server_destroy(server);
-        term_destroy(it->item);
+    term_destroy(term);
-
-    int child_ret = wayl->last_exit_value;
-
     wayl_destroy(wayl);
     fdm_destroy(fdm);
     config_free(conf);
 
-    return ret == EXIT_SUCCESS ? child_ret : ret;
+    return ret == EXIT_SUCCESS && !as_server ? shutdown_ctx.exit_code : ret;
-
 }

terminal.c

@@ -289,7 +289,8 @@ initialize_fonts(struct terminal *term, const struct config *conf)
 
 struct terminal *
 term_init(const struct config *conf, struct fdm *fdm, struct wayland *wayl,
-          int argc, char *const *argv)
+          int argc, char *const *argv,
+          void (*shutdown_cb)(void *data, int exit_code), void *shutdown_data)
 {
     int ptmx = -1;
     int flash_fd = -1;
@@ -411,6 +412,8 @@ term_init(const struct config *conf, struct fdm *fdm, struct wayland *wayl,
             .lower_fd = delay_lower_fd,
             .upper_fd = delay_upper_fd,
         },
+        .shutdown_cb = shutdown_cb,
+        .shutdown_data = shutdown_data,
     };
 
     initialize_color_cube(term);
@@ -484,8 +487,12 @@ fdm_shutdown(struct fdm *fdm, int fd, int events, void *data)
     assert(wayl->focused != term);
     assert(wayl->moused != term);
 
+    void (*cb)(void *, int) = term->shutdown_cb;
+    void *cb_data = term->shutdown_data;
 
     int exit_code = term_destroy(term);
+    if (cb != NULL)
+        cb(cb_data, exit_code);
 
     return true;
 }

terminal.h

@@ -287,12 +287,18 @@ struct terminal {
         int lower_fd;
         int upper_fd;
     } delayed_render_timer;
+
+    bool is_shutting_down;
+    void (*shutdown_cb)(void *data, int exit_code);
+    void *shutdown_data;
 };
 
 struct config;
 struct terminal *term_init(
     const struct config *conf, struct fdm *fdm, struct wayland *wayl,
-    int argc, char *const *argv);
+    int argc, char *const *argv,
+    void (*shutdown_cb)(void *data, int exit_code), void *shutdown_data);
+
 bool term_shutdown(struct terminal *term);
 int term_destroy(struct terminal *term);
 

wayland.h

@@ -150,7 +150,6 @@ struct wayland {
     tll(struct terminal *) terms;
     struct terminal *focused;
     struct terminal *moused;
-    int last_exit_value;           /* TODO: exit value from client(s)? */
 };
 
 struct wayland *wayl_init(struct fdm *fdm);