https://github.com/swaywm/sway/issues/8673#issuecomment-2818260191
https://github.com/swaywm/sway/issues/8828#issuecomment-3290045852

--- common/stringop.c.orig	2025-04-20 11:31:10 UTC
+++ common/stringop.c
@@ -6,6 +6,8 @@
 #include <string.h>
 #include <strings.h>
 #include <wordexp.h>
+#include <signal.h>
+#include <sys/wait.h>
 #include "list.h"
 #include "log.h"
 #include "stringop.h"
@@ -319,7 +321,33 @@ bool expand_path(char **path) {
 		memmove(ptr + 1, ptr, strlen(ptr) + 1);
 		*ptr = '\\';
 	}
-	if (wordexp(*path, &p, 0) != 0 || p.we_wordv[0] == NULL) {
+
+	// FreeBSD wordexp bug workaround:
+	// 1. Reset SIGCHLD handler
+	// 2. Run wordexp
+	// 3. Restore SIGCHLD handler and reap any processes that exited
+	struct sigaction prev_action;
+	struct sigaction new_action = {
+		.sa_flags = SA_RESETHAND,
+	};
+	if (sigaction(SIGCHLD, &new_action, &prev_action) != 0) {
+		sway_log(SWAY_ERROR, "Restoring sigchild before wordexp failed");
+		return false;
+	}
+
+	int res = wordexp(*path, &p, 0);
+
+	if (sigaction(SIGCHLD, &prev_action, NULL) != 0) {
+		sway_log(SWAY_ERROR, "Restoring sigchild after wordexp failed");
+	}
+
+	int status;
+	int wres;
+	do {
+		wres = waitpid(-1, &status, WNOHANG);
+	} while (wres > 0 || (wres == -1 && errno == EINTR));
+
+	if (res != 0 || p.we_wordv[0] == NULL) {
 		wordfree(&p);
 		return false;
 	}