swallow: upgrading to latest version with OpenBSD support

dwm.c

@@ -4394,7 +4394,11 @@ main(int argc, char *argv[])
 	#endif // COOL_AUTOSTART_PATCH
 	setup();
 #ifdef __OpenBSD__
+	#if SWALLOW_PATCH
+	if (pledge("stdio rpath proc exec ps", NULL) == -1)
+	#else
 	if (pledge("stdio rpath proc exec", NULL) == -1)
+	#endif // SWALLOW_PATCH
 		die("pledge");
 #endif /* __OpenBSD__ */
 	scan();

patch/swallow.c

@@ -1,5 +1,9 @@
 #include <X11/Xlib-xcb.h>
 #include <xcb/res.h>
+#ifdef __OpenBSD__
+#include <sys/sysctl.h>
+#include <kvm.h>
+#endif /* __OpenBSD__ */
 
 static int scanner;
 static xcb_connection_t *xcon;
@@ -64,6 +68,7 @@ winpid(Window w)
 {
 	pid_t result = 0;
 
+	#ifdef __linux__
 	xcb_res_client_id_spec_t spec = {0};
 	spec.client = w;
 	spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
@@ -89,6 +94,23 @@ winpid(Window w)
 
 	if (result == (pid_t)-1)
 		result = 0;
+
+	#endif /* __linux__ */
+	#ifdef __OpenBSD__
+	Atom type;
+	int format;
+	unsigned long len, bytes;
+	unsigned char *prop;
+	pid_t ret;
+
+	if (XGetWindowProperty(dpy, w, XInternAtom(dpy, "_NET_WM_PID", 1), 0, 1, False, AnyPropertyType, &type, &format, &len, &bytes, &prop) != Success || !prop)
+		return 0;
+
+	ret = *(pid_t*)prop;
+	XFree(prop);
+	result = ret;
+	#endif /* __OpenBSD__ */
+
 	return result;
 }
 
@@ -97,7 +119,7 @@ getparentprocess(pid_t p)
 {
 	unsigned int v = 0;
 
-#if defined(__linux__)
+#ifdef __linux__
 	FILE *f;
 	char buf[256];
 	snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
@@ -108,14 +130,19 @@ getparentprocess(pid_t p)
 	if (fscanf(f, "%*u %*s %*c %u", (unsigned *)&v) != 1)
 		v = (pid_t)0;
 	fclose(f);
-#elif defined(__FreeBSD__)
-	struct kinfo_proc *proc = kinfo_getproc(p);
-	if (!proc)
-		return (pid_t)0;
-
-	v = proc->ki_ppid;
-	free(proc);
-#endif
+#endif /* __linux__ */
+#ifdef __OpenBSD__
+	int n;
+	kvm_t *kd;
+	struct kinfo_proc *kp;
+
+	kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL);
+	if (!kd)
+		return 0;
+
+	kp = kvm_getprocs(kd, KERN_PROC_PID, p, sizeof(*kp), &n);
+	v = kp->p_ppid;
+#endif /* __OpenBSD__ */
 	return (pid_t)v;
 }