diff --git a/AppKit/fifo.c b/AppKit/fifo.c
index 1c6f4ab..b632666 100644
--- a/AppKit/fifo.c
+++ b/AppKit/fifo.c
@@ -141,7 +141,7 @@ os_size_t fifo_read_fast(fifo_t* rb, uint8_t * data, os_size_t len){
     //       w        r
 
     if(write_idx > read_idx){
-        memcpy(&data, &rb->buffer[read_idx], len);
+        memcpy(data, &rb->buffer[read_idx], len);
     }else{
         os_size_t first_part = size - read_idx;
         if(first_part >= len){
@@ -203,7 +203,7 @@ os_size_t fifo_peek_bulk(fifo_t* rb, os_size_t offset, uint8_t* data, os_size_t
     //       w        r
 
     if(write_idx > read_idx){
-        memcpy(&data, &rb->buffer[read_idx], len);
+        memcpy(data, &rb->buffer[read_idx], len);
     }else{
         os_size_t first_part = size - read_idx;
         if(first_part >= len){
@@ -249,16 +249,16 @@ int fifo_memcmp(fifo_t *rb, os_size_t offset, const void *ptr, os_size_t len) {
  */
 os_size_t fifo_find(fifo_t *rb, os_size_t offset, const void *pattern, os_size_t pattern_len) {
     if (!rb || !pattern || pattern_len == 0) {
-        return -1u;
+        return FIFO_INVALID_POS;
     }
 
     os_size_t data_size = fifo_count(rb);
     if(offset > data_size){
-        return -1u; // 开始查找位置错误了
+        return FIFO_INVALID_POS; // 开始查找位置错误了
     }
 
     if (pattern_len > (data_size - offset) ) {
-        return -1u; // 模式长度超过缓冲区数据量，不可能找到
+        return FIFO_INVALID_POS; // 模式长度超过缓冲区数据量，不可能找到
     }
 
     // 遍历缓冲区中所有可能的起始位置
@@ -290,7 +290,7 @@ os_size_t fifo_find(fifo_t *rb, os_size_t offset, const void *pattern, os_size_t
         }
     }
 
-    return -1u;
+    return FIFO_INVALID_POS;
 }
 
 unsigned long fifo_strtoul(fifo_t* self, os_size_t* endptr /*从哪里开始转换*/, int base) {
@@ -397,3 +397,29 @@ unsigned long fifo_strtoul(fifo_t* self, os_size_t* endptr /*从哪里开始转
     return acc;
 }
 
+// Returns the virtual index relative to tail where the match starts, or -1 if not found
+os_size_t fifo_strstr(fifo_t *self, const char *search) {
+    os_size_t search_len = strlen(search);
+    os_size_t count = fifo_count(self);
+    if (search_len == 0 || count < search_len) return FIFO_INVALID_POS;
+
+    // Loop through every possible starting position in the ring buffer
+    for (os_size_t i = 0; i <= (count - search_len); i++) {
+        bool match = true;
+
+        // Check if the substring matches starting at virtual position i
+        for (os_size_t j = 0; j < search_len; j++) {
+            os_size_t rd_index = (self->read_idx + i + j) % self->buffer_size;
+            if (self->buffer[rd_index] != search[j]) {
+                match = false;
+                break;
+            }
+        }
+
+        if (match) {
+            return i; // Return the position relative to the current tail
+        }
+    }
+    return FIFO_INVALID_POS;
+}
+
diff --git a/AppKit/fifo.h b/AppKit/fifo.h
index 1d68fc6..576caf5 100644
--- a/AppKit/fifo.h
+++ b/AppKit/fifo.h
@@ -26,6 +26,8 @@ typedef struct fifo_t{
     os_size_t read_idx;
 }fifo_t;
 
+#define FIFO_INVALID_POS ((os_size_t)(-1))
+
 /* ==================================================================================================== */
 /* 接口 */
 
@@ -139,4 +141,6 @@ os_size_t fifo_find(fifo_t *rb, os_size_t offset, const void *pattern, os_size_t
 
 unsigned long fifo_strtoul(fifo_t* self, os_size_t* endptr /*从哪里开始转换, 可以为空*/, int base /*0, 8, 10, 16 进制*/);
 
+os_size_t fifo_strstr(fifo_t *self, const char *search);
+
 #endif /*INCLUDED_FIFO_H*/
diff --git a/Kernel/SingleCore/os_sem.h b/Kernel/SingleCore/os_sem.h
index 8f78a03..6e2c241 100644
--- a/Kernel/SingleCore/os_sem.h
+++ b/Kernel/SingleCore/os_sem.h
@@ -85,4 +85,14 @@ void os_sem_notify_one_in_isr(os_sem_t* self){
     os_waitobject_notify_one_in_isr(&self->wait_obj);
 }
 
+OS_STATIC_FORCE_INLINE
+void os_sem_reset(os_sem_t* self){
+    os_critical_enter();
+    self->value = 0;
+    os_waitobject_init(&self->wait_obj);
+    os_critical_leave();
+}
+
+
+
 #endif /*INCLUDED_OS_SEM_H*/