From 4b2ecdf936366c79f3c58ef09dee3d87ccca88a8 Mon Sep 17 00:00:00 2001
From: Matthieu Herrb <matthieu@herrb.eu>
Date: Wed, 5 Jul 2023 10:49:24 +0200
Subject: [PATCH] Add basic OpenBSD support

XXX more work needed to manage VT switches and proper
XXX fbtab(4) support to allow for non-root users
---
 common/drm.c      |  2 +-
 common/evdev.c    |  2 +-
 common/terminal.c | 12 ++++++++++--
 seatd/client.c    | 17 +++++++++++++++++
 tests/poller.c    |  4 ++++
 5 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/common/drm.c b/common/drm.c
index 06d6720..2fbadd5 100644
--- a/common/drm.c
+++ b/common/drm.c
@@ -21,7 +21,7 @@ int drm_drop_master(int fd) {
 	return ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
 }
 
-#if defined(__linux__) || defined(__NetBSD__)
+#if defined(__linux__) || defined(__NetBSD__) || defined(__OpenBSD__)
 int path_is_drm(const char *path) {
 	if (STR_HAS_PREFIX("/dev/dri/", path))
 		return 1;
diff --git a/common/evdev.c b/common/evdev.c
index 7ec0fe2..a77bf36 100644
--- a/common/evdev.c
+++ b/common/evdev.c
@@ -25,7 +25,7 @@ int path_is_evdev(const char *path) {
 int evdev_revoke(int fd) {
 	return ioctl(fd, EVIOCREVOKE, NULL);
 }
-#elif defined(__NetBSD__)
+#elif defined(__NetBSD__) || defined(__OpenBSD__)
 int path_is_evdev(const char *path) {
 	(void)path;
 	return 0;
diff --git a/common/terminal.c b/common/terminal.c
index fa220a2..7c1342e 100644
--- a/common/terminal.c
+++ b/common/terminal.c
@@ -21,7 +21,7 @@
 #define K_ENABLE  K_XLATE
 #define K_DISABLE K_RAW
 #define FRSIG     SIGIO
-#elif defined(__NetBSD__)
+#elif defined(__NetBSD__) || defined(__OpenBSD__)
 #include <dev/wscons/wsdisplay_usl_io.h>
 #define K_ENABLE  K_XLATE
 #define K_DISABLE K_RAW
@@ -147,6 +147,14 @@ static int get_tty_path(int tty, char path[static TTYPATHLEN]) {
 	}
 	return 0;
 }
+#elif defined(__OpenBSD__)
+static int get_tty_path(int tty, char path[static TTYPATHLEN]) {
+	assert(tty >= 0);
+	if (snprintf(path, TTYPATHLEN, "/dev/ttyC%d", tty) == -1) {
+		return -1;
+	}
+	return 0;
+}
 #else
 #error Unsupported platform
 #endif
@@ -175,7 +183,7 @@ int terminal_current_vt(int fd) {
 		return -1;
 	}
 	return st.v_active;
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
 	int vt;
 	int res = ioctl(fd, VT_GETACTIVE, &vt);
 	close(fd);
diff --git a/seatd/client.c b/seatd/client.c
index a33bfe7..0ab16f8 100644
--- a/seatd/client.c
+++ b/seatd/client.c
@@ -55,6 +55,23 @@ static int get_peer(int fd, pid_t *pid, uid_t *uid, gid_t *gid) {
 	*uid = cred.unp_euid;
 	*gid = cred.unp_egid;
 	return 0;
+#elif defined(__OpenBSD__)
+	struct sockpeercred peercred;
+	socklen_t len = sizeof(peercred);
+	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &peercred, &len) == -1) {
+		// assume builtin backend
+		if (errno == EINVAL) {
+			*pid = getpid();
+			*uid = getuid();
+			*gid = getgid();
+			return 0;
+		}
+		return -1;
+	}
+	*pid = peercred.pid;
+	*uid = peercred.uid;
+	*gid = peercred.gid;
+	return 0;
 #elif defined(__FreeBSD__)
 	struct xucred cred;
 	socklen_t len = sizeof cred;
diff --git a/tests/poller.c b/tests/poller.c
index 382d9d2..dd36c7d 100644
--- a/tests/poller.c
+++ b/tests/poller.c
@@ -123,6 +123,10 @@ static int test_signal_event(int signal, void *data) {
 	return 0;
 }
 
+#ifdef __OpenBSD__
+#define SIGRTMIN  SIGUSR1
+#endif
+
 static void test_poller_single_signal(void) {
 	struct poller poller;
 	test_assert(poller_init(&poller) == 0);