From 458ef9f07d187ad45932285bc1d2d90c9d9f041a Mon Sep 17 00:00:00 2001
From: Denis <benato.denis96@gmail.com>
Date: Sat, 23 Dec 2023 23:59:33 +0100
Subject: [PATCH] works with both kernel and sdl2 while using bt

---
 dev_out.c    |  21 ++---
 virt_ds5.c   |  13 ++-
 virt_kbd.c   | 251 +++++++++++++++------------------------------------
 virt_mouse.c |  78 ++++++++--------
 4 files changed, 133 insertions(+), 230 deletions(-)

diff --git a/dev_out.c b/dev_out.c
index a205f0a..2707747 100644
--- a/dev_out.c
+++ b/dev_out.c
@@ -374,13 +374,8 @@ static void handle_incoming_message(
     }
 }
 
-int64_t get_timediff_usec(const struct timeval *const past, const struct timeval *const now) {
-    struct timeval tdiff;
-    timersub(now, past, &tdiff);
-
-    //const int64_t sgn = ((now->tv_sec > past->tv_sec) || ((now->tv_sec == past->tv_sec) && (now->tv_usec > past->tv_usec))) ? -1 : +1;
-
-    return (int64_t)(tdiff.tv_sec) * (int64_t)1000000 + (int64_t)(tdiff.tv_usec);
+int64_t get_timediff_usec(const struct timespec *const start, const struct timespec *const end) {
+    return (end->tv_sec - start->tv_sec) * 1000000000LL + (end->tv_nsec - start->tv_nsec);
 }
 
 void *dev_out_thread_func(void *ptr) {
@@ -453,12 +448,12 @@ void *dev_out_thread_func(void *ptr) {
         }
     }
 
-    struct timeval now = {0};
-    gettimeofday(&now, NULL);
+    struct timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
 
-    struct timeval gamepad_last_hid_report_sent = now;
-    struct timeval mouse_last_hid_report_sent = now;
-    struct timeval keyboard_last_hid_report_sent = now;
+    struct timespec gamepad_last_hid_report_sent = now;
+    struct timespec mouse_last_hid_report_sent = now;
+    struct timespec keyboard_last_hid_report_sent = now;
 
     uint8_t tmp_buf[256];
 
@@ -473,7 +468,7 @@ void *dev_out_thread_func(void *ptr) {
         const int64_t mouse_time_diff_usecs = get_timediff_usec(&mouse_last_hid_report_sent, &now);
         const int64_t kbd_time_diff_usecs = get_timediff_usec(&keyboard_last_hid_report_sent, &now);
 
-        gettimeofday(&now, NULL);
+        clock_gettime(CLOCK_MONOTONIC, &now);
         if ((current_gamepad_fd > 0) && (gamepad_time_diff_usecs >= gamepad_report_timing_us)) {
             gamepad_last_hid_report_sent = now;
             
diff --git a/virt_ds5.c b/virt_ds5.c
index 6b90fe2..65f3969 100644
--- a/virt_ds5.c
+++ b/virt_ds5.c
@@ -1037,7 +1037,7 @@ int virt_dualsense_event(virt_dualsense_t *const gamepad, gamepad_status_t *cons
         // first byte is report-id which is 0x01
         if (
             (!gamepad->bluetooth) && (ev.u.output.data[0] != DS_OUTPUT_REPORT_USB) &&
-            (gamepad->bluetooth) && (ev.u.output.data[0] != DS_OUTPUT_REPORT_BT) 
+            (gamepad->bluetooth) && ((ev.u.output.data[0] != DS_OUTPUT_REPORT_BT) && (ev.u.output.data[0] < 0x10))
         ) {
             fprintf(
                 stderr,
@@ -1050,7 +1050,16 @@ int virt_dualsense_event(virt_dualsense_t *const gamepad, gamepad_status_t *cons
         
         // When using bluetooth, the first byte after the reportID is uint8_t seq_tag,
 	    // while the next one is uint8_t tag, following bytes are the same.
-        const uint8_t *const common_report = (gamepad->bluetooth) ? &ev.u.output.data[3] : &ev.u.output.data[1];
+        size_t offset = 1;
+        if ((gamepad->bluetooth) && (ev.u.output.data[0] > 0x10)) {
+            offset = 2;
+        } else if ((gamepad->bluetooth) && (ev.u.output.data[0] == 0x02)) {
+            offset = 3;
+        } else if ((gamepad->bluetooth) && (ev.u.output.data[0] == 0x01)) {
+            offset = 1;
+        }
+
+        const uint8_t *const common_report = &ev.u.output.data[offset];
 
         const uint8_t valid_flag0 = common_report[0];
         const uint8_t valid_flag1 = common_report[1];
diff --git a/virt_kbd.c b/virt_kbd.c
index b535124..7a7ca3a 100644
--- a/virt_kbd.c
+++ b/virt_kbd.c
@@ -99,376 +99,252 @@ int virt_kbd_get_fd(virt_kbd_t *const kbd) {
 int virt_kbd_send(virt_kbd_t *const kbd, keyboard_status_t *const status, struct timeval *const now) {
     int res = 0;
     
-    struct timeval syn_time;
-    gettimeofday(&syn_time, NULL);
+    size_t events_count = 0;
+    struct input_event events[12];
 
     struct input_event tmp_ev;
-    gettimeofday(&tmp_ev.time, NULL);
-    if (now != NULL) {
-        tmp_ev.time = *now;
-    }
 
     tmp_ev.type = EV_KEY;
 
     if (status->q != kbd->prev_q) {
         tmp_ev.code = KEY_Q;
         tmp_ev.value = kbd->prev_q = status->q;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->w != kbd->prev_w) {
         tmp_ev.code = KEY_W;
         tmp_ev.value = kbd->prev_w = status->w;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->e != kbd->prev_e) {
         tmp_ev.code = KEY_E;
         tmp_ev.value = kbd->prev_e = status->e;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->r != kbd->prev_r) {
         tmp_ev.code = KEY_R;
         tmp_ev.value = kbd->prev_r = status->r;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->t != kbd->prev_t) {
         tmp_ev.code = KEY_T;
         tmp_ev.value = kbd->prev_t = status->t;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->y != kbd->prev_y) {
         tmp_ev.code = KEY_Y;
         tmp_ev.value = kbd->prev_y = status->y;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->u != kbd->prev_u) {
         tmp_ev.code = KEY_U;
         tmp_ev.value = kbd->prev_u = status->u;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->i != kbd->prev_i) {
         tmp_ev.code = KEY_I;
         tmp_ev.value = kbd->prev_i = status->i;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->o != kbd->prev_o) {
         tmp_ev.code = KEY_O;
         tmp_ev.value = kbd->prev_o = status->o;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->p != kbd->prev_p) {
         tmp_ev.code = KEY_P;
         tmp_ev.value = kbd->prev_p = status->p;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->a != kbd->prev_a) {
         tmp_ev.code = KEY_A;
         tmp_ev.value = kbd->prev_a = status->a;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->s != kbd->prev_s) {
         tmp_ev.code = KEY_S;
         tmp_ev.value = kbd->prev_s = status->s;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
 
     if (status->d != kbd->prev_d) {
         tmp_ev.code = KEY_D;
         tmp_ev.value = kbd->prev_d = status->d;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->f != kbd->prev_f) {
         tmp_ev.code = KEY_F;
         tmp_ev.value = kbd->prev_f = status->f;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->g != kbd->prev_g) {
         tmp_ev.code = KEY_G;
         tmp_ev.value = kbd->prev_g = status->g;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->h != kbd->prev_h) {
         tmp_ev.code = KEY_H;
         tmp_ev.value = kbd->prev_h = status->h;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->j != kbd->prev_j) {
         tmp_ev.code = KEY_J;
         tmp_ev.value = kbd->prev_j = status->j;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->k != kbd->prev_k) {
         tmp_ev.code = KEY_K;
         tmp_ev.value = kbd->prev_k = status->k;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->l != kbd->prev_l) {
         tmp_ev.code = KEY_L;
         tmp_ev.value = kbd->prev_l = status->l;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->z != kbd->prev_z) {
         tmp_ev.code = KEY_Z;
         tmp_ev.value = kbd->prev_z = status->z;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->x != kbd->prev_x) {
         tmp_ev.code = KEY_X;
         tmp_ev.value = kbd->prev_x = status->x;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->c != kbd->prev_c) {
         tmp_ev.code = KEY_C;
         tmp_ev.value = kbd->prev_c = status->c;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->v != kbd->prev_v) {
         tmp_ev.code = KEY_V;
         tmp_ev.value = kbd->prev_v = status->v;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->b != kbd->prev_b) {
         tmp_ev.code = KEY_B;
         tmp_ev.value = kbd->prev_b = status->b;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->n != kbd->prev_n) {
         tmp_ev.code = KEY_N;
         tmp_ev.value = kbd->prev_n = status->n;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->m != kbd->prev_m) {
         tmp_ev.code = KEY_M;
         tmp_ev.value = kbd->prev_m = status->m;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_0 != kbd->prev_num_0) {
         tmp_ev.code = KEY_0;
         tmp_ev.value = kbd->prev_num_0 = status->num_0;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_1 != kbd->prev_num_1) {
         tmp_ev.code = KEY_1;
         tmp_ev.value = kbd->prev_num_1 = status->num_1;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_2 != kbd->prev_num_2) {
         tmp_ev.code = KEY_2;
         tmp_ev.value = kbd->prev_num_2 = status->num_2;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_3 != kbd->prev_num_3) {
         tmp_ev.code = KEY_3;
         tmp_ev.value = kbd->prev_num_3 = status->num_3;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_4 != kbd->prev_num_4) {
         tmp_ev.code = KEY_4;
         tmp_ev.value = kbd->prev_num_4 = status->num_4;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_5 != kbd->prev_num_5) {
         tmp_ev.code = KEY_5;
         tmp_ev.value = kbd->prev_num_5 = status->num_5;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_6 != kbd->prev_num_6) {
         tmp_ev.code = KEY_6;
         tmp_ev.value = kbd->prev_num_6 = status->num_6;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_7 != kbd->prev_num_7) {
         tmp_ev.code = KEY_7;
         tmp_ev.value = kbd->prev_num_7 = status->num_7;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_8 != kbd->prev_num_8) {
         tmp_ev.code = KEY_8;
         tmp_ev.value = kbd->prev_num_8 = status->num_8;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->num_9 != kbd->prev_num_9) {
         tmp_ev.code = KEY_9;
         tmp_ev.value = kbd->prev_num_9 = status->num_9;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->lctrl != kbd->prev_lctrl) {
         tmp_ev.code = KEY_LEFTCTRL;
         tmp_ev.value = kbd->prev_lctrl = status->lctrl;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->up != kbd->prev_up) {
         tmp_ev.code = KEY_UP;
         tmp_ev.value = kbd->prev_up = status->up;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->down != kbd->prev_down) {
         tmp_ev.code = KEY_DOWN;
         tmp_ev.value = kbd->prev_down = status->down;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->left != kbd->prev_left) {
         tmp_ev.code = KEY_LEFT;
         tmp_ev.value = kbd->prev_left = status->left;
-        if (write(kbd->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_kbd_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->right != kbd->prev_right) {
@@ -493,18 +369,39 @@ int virt_kbd_send(virt_kbd_t *const kbd, keyboard_status_t *const status, struct
 	}
     #endif
 
-    syn_time.tv_usec += 1;
-	const struct input_event syn_ev = {
-		.code = SYN_REPORT,
-		.type = EV_SYN,
-		.value = 0,
-		.time = syn_time,
-	};
-	const ssize_t sync_written = write(kbd->fd, (void*)&syn_ev, sizeof(syn_ev));
-	if (sync_written != sizeof(syn_ev)) {
-		fprintf(stderr, "Error in sync: written %ld bytes out of %ld\n", sync_written, sizeof(syn_ev));
-	}
+    if (events_count > 0) {
+        struct timeval t;
+        if (now != NULL) {
+            t = *now;
+        } else {
+            gettimeofday(&t, NULL);
+        }
+        
+        struct input_event syn_ev = {
+            .code = SYN_REPORT,
+            .type = EV_SYN,
+            .value = 0,
+            .time = t,
+        };
+        syn_ev.time.tv_usec += 1;
 
+        events[events_count++] = syn_ev;
+
+        for (size_t i = 0; i < events_count; ++i) {
+            if (i != (events_count - 1)) {
+                events[i].time = t;
+            }
+
+            const ssize_t sync_written = write(kbd->fd, (void*)&events[i], sizeof(struct input_event));
+            if (sync_written != sizeof(syn_ev)) {
+                fprintf(stderr, "Error in sync: written %ld bytes out of %ld\n", sync_written, sizeof(syn_ev));
+                res = errno;
+                res = res < 0 ? res : -1*res;
+                res = res == 0 ? -EIO : res;
+                goto virt_kbd_send_err;
+            }
+        }
+    }
 virt_kbd_send_err:
     return res;
 }
diff --git a/virt_mouse.c b/virt_mouse.c
index 24374f8..ff02eaf 100644
--- a/virt_mouse.c
+++ b/virt_mouse.c
@@ -66,33 +66,22 @@ int virt_mouse_get_fd(virt_mouse_t *const mouse) {
 int virt_mouse_send(virt_mouse_t *const mouse, mouse_status_t *const status, struct timeval *const now) {
     int res = 0;
     
-    struct timeval syn_time;
-    gettimeofday(&syn_time, NULL);
+    size_t events_count = 0;
+    struct input_event events[12];
 
     struct input_event tmp_ev;
-    gettimeofday(&tmp_ev.time, NULL);
-    if (now != NULL) {
-        tmp_ev.time = *now;
-    }
-
     tmp_ev.type = EV_REL;
 
     if (status->x != 0) {
         tmp_ev.code = REL_X;
         tmp_ev.value = status->x;
-        if (write(mouse->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_mouse_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->y != 0) {
         tmp_ev.code = REL_Y;
         tmp_ev.value = status->y;
-        if (write(mouse->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_mouse_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     tmp_ev.type = EV_KEY;
@@ -101,30 +90,21 @@ int virt_mouse_send(virt_mouse_t *const mouse, mouse_status_t *const status, str
         mouse->prev_btn_left = status->btn_left;
         tmp_ev.code = BTN_LEFT;
         tmp_ev.value = status->btn_left;
-        if (write(mouse->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_mouse_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->btn_middle != mouse->prev_btn_middle) {
         mouse->prev_btn_middle = status->btn_middle;
         tmp_ev.code = BTN_MIDDLE;
         tmp_ev.value = status->btn_middle;
-        if (write(mouse->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_mouse_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     if (status->btn_right != mouse->prev_btn_right) {
         mouse->prev_btn_right = status->btn_right;
         tmp_ev.code = BTN_RIGHT;
         tmp_ev.value = status->btn_right;
-        if (write(mouse->fd, &tmp_ev, sizeof(tmp_ev)) != sizeof(struct input_event)) {
-            res = errno < 0 ? errno : -1 * errno;
-            goto virt_mouse_send_err;
-        }
+        events[events_count++] = tmp_ev;
     }
 
     #if 0
@@ -140,17 +120,39 @@ int virt_mouse_send(virt_mouse_t *const mouse, mouse_status_t *const status, str
 	}
     #endif
 
-    syn_time.tv_usec += 1;
-	const struct input_event syn_ev = {
-		.code = SYN_REPORT,
-		.type = EV_SYN,
-		.value = 0,
-		.time = syn_time,
-	};
-	const ssize_t sync_written = write(mouse->fd, (void*)&syn_ev, sizeof(syn_ev));
-	if (sync_written != sizeof(syn_ev)) {
-		fprintf(stderr, "Error in sync: written %ld bytes out of %ld\n", sync_written, sizeof(syn_ev));
-	}
+    if (events_count > 0) {
+        struct timeval t;
+        if (now != NULL) {
+            t = *now;
+        } else {
+            gettimeofday(&t, NULL);
+        }
+        
+        struct input_event syn_ev = {
+            .code = SYN_REPORT,
+            .type = EV_SYN,
+            .value = 0,
+            .time = t,
+        };
+        syn_ev.time.tv_usec += 1;
+
+        events[events_count++] = syn_ev;
+
+        for (size_t i = 0; i < events_count; ++i) {
+            if (i != (events_count - 1)) {
+                events[i].time = t;
+            }
+
+            const ssize_t sync_written = write(mouse->fd, (void*)&events[i], sizeof(struct input_event));
+            if (sync_written != sizeof(syn_ev)) {
+                fprintf(stderr, "Error in sync: written %ld bytes out of %ld\n", sync_written, sizeof(syn_ev));
+                res = errno;
+                res = res < 0 ? res : -1*res;
+                res = res == 0 ? -EIO : res;
+                goto virt_mouse_send_err;
+            }
+        }
+    }
 
 virt_mouse_send_err:
     return res;