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fix(editor): guard against re-entrant launch_editor

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The async editor rewrite (g_child_watch + ui_suspend / ui_resume) lost
the editor_task.active check the old pthread implementation had at the
top of get_message_from_editor_async. With the guard gone, a second
launch_editor call while the first session is in flight would call
ui_suspend a second time, fork another editor, and register a second
child watch; whichever child exits first runs ui_resume and clears
suspension while the other still owns the terminal. Triggering this
needs a code path other than the main-loop alt+c / /editor (those can't
fire while the main loop is parked in the suspended iteration), so the
realistic source is a plugin firing launch_editor from a
g_main_context_iteration dispatch.

Restore an explicit editor_active static in src/tools/editor.c: check it
at the start of launch_editor (bail with a console error), set it just
before ui_suspend, and clear it on the fork-error path and at the start
of _editor_exit_cb. Keeps the same simple semantics the pre-merge code
had, without exposing a new ui.h API.
This commit is contained in:
jabber.developer2
2026-05-29 08:49:57 +03:00
parent b1ffc750a2
commit a51afa53f6
1 changed files with 18 additions and 0 deletions
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18
src/tools/editor.c
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@@ -32,9 +32,20 @@ typedef struct EditorContext
void* user_data;
} EditorContext;
// Set TRUE for the lifetime of an editor session (from launch_editor up to
// _editor_exit_cb / fork-error cleanup). The async editor model lost the old
// editor_task.active check from the pthread implementation; without this
// guard a second launch_editor (e.g. via a plugin dispatched through
// g_main_context_iteration) would call ui_suspend again and fork a second
// editor that fights the first one for the terminal, then prematurely
// ui_resume when either exits.
static gboolean editor_active = FALSE;
static void
_editor_exit_cb(GPid pid, gint status, gpointer data)
{
editor_active = FALSE;
EditorContext* ctx = data;
gchar* contents = NULL;
GError* error = NULL;
@@ -70,6 +81,11 @@ _editor_exit_cb(GPid pid, gint status, gpointer data)
gboolean
launch_editor(gchar* initial_content, void (*callback)(gchar* content, void* data), void* user_data)
{
if (editor_active) {
cons_show_error("An editor session is already active.");
return TRUE;
}
auto_gchar gchar* filename = NULL;
auto_gerror GError* glib_error = NULL;
const char* jid = connection_get_barejid();
@@ -118,6 +134,7 @@ launch_editor(gchar* initial_content, void (*callback)(gchar* content, void* dat
ctx->callback = callback;
ctx->user_data = user_data;
editor_active = TRUE;
ui_suspend();
// Force GLib to install its SIGCHLD handler before forking. Creating a
@@ -129,6 +146,7 @@ launch_editor(gchar* initial_content, void (*callback)(gchar* content, void* dat
pid_t pid = fork();
if (pid == -1) {
log_error("[Editor] Failed to fork: %s", strerror(errno));
editor_active = FALSE;
ui_resume();
ui_resize();
cons_show_error("Failed to start editor: %s", strerror(errno));