diff --git a/commit.patch b/commit.patch
new file mode 100644
index 0000000000000000000000000000000000000000..0ceccdcc0dece7d24231a2ed5360d6455fe2c421
--- /dev/null
+++ b/commit.patch
@@ -0,0 +1,302 @@
+diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
+new file mode 100644
+index 0000000..ee68b3d
+--- /dev/null
++++ b/.vscode/c_cpp_properties.json
+@@ -0,0 +1,17 @@
++{
++    "configurations": [
++        {
++            "name": "Linux",
++            "includePath": [
++                "${workspaceFolder}/**",
++                "${workspaceFolder}"
++            ],
++            "defines": [],
++            "compilerPath": "/usr/bin/gcc",
++            "cStandard": "c17",
++            "cppStandard": "gnu++17",
++            "intelliSenseMode": "linux-gcc-arm64"
++        }
++    ],
++    "version": 4
++}
+\ No newline at end of file
+diff --git a/.vscode/settings.json b/.vscode/settings.json
+new file mode 100644
+index 0000000..cfa3082
+--- /dev/null
++++ b/.vscode/settings.json
+@@ -0,0 +1,6 @@
++{
++    "files.associations": {
++        "types.h": "c",
++        "user.h": "c"
++    }
++}
+\ No newline at end of file
+diff --git a/Makefile b/Makefile
+index 323d089..dfd49cb 100644
+--- a/Makefile
++++ b/Makefile
+@@ -157,6 +157,9 @@ UPROGS=\
+ 	$U/_grind\
+ 	$U/_wc\
+ 	$U/_zombie\
++	$U/_sleep\
++	$U/_pingpong\
++	$U/_find\
+ 
+ ifeq ($(LAB),syscall)
+ UPROGS += \
+diff --git a/user/command.gdb b/user/command.gdb
+new file mode 100644
+index 0000000..5383d55
+--- /dev/null
++++ b/user/command.gdb
+@@ -0,0 +1,6 @@
++b exec
++b kernel/sysfile.c:384
++c
++p cpus[$tp]->proc->name
++c
++p cpus[$tp]->proc->name
+diff --git a/user/find.c b/user/find.c
+new file mode 100644
+index 0000000..a5280d0
+--- /dev/null
++++ b/user/find.c
+@@ -0,0 +1,105 @@
++#include "kernel/types.h"
++#include "kernel/stat.h"
++#include "user/user.h"
++#include "kernel/fs.h"
++#include "kernel/fcntl.h"
++
++// 函数声明
++void find(const char *path, const char *name);
++
++// 去除文件名前的路径，只保留文件名部分
++char *
++fmtname(char *path) {
++  static char buf[DIRSIZ+1];
++  char *p;
++
++  // 找到路径中最后的 '/' 字符
++  for(p = path + strlen(path); p >= path && *p != '/'; p--)
++    ;
++  p++;
++
++  // 拷贝最后的文件名部分
++  if(strlen(p) >= DIRSIZ)
++    return p;
++  memmove(buf, p, strlen(p));
++  buf[strlen(p)] = 0;
++  return buf;
++}
++
++// 递归查找目录下的文件和目录
++void
++find(const char *path, const char *name) {
++  char buf[512], *p;
++  int fd;
++  struct dirent de;
++  struct stat st;
++
++  // 打开指定路径
++  if((fd = open(path, O_RDONLY)) < 0){
++    fprintf(2, "find: cannot open %s\n", path);
++    return;
++  }
++
++  // 获取文件的状态信息
++  if(fstat(fd, &st) < 0){
++    fprintf(2, "find: cannot stat %s\n", path);
++    close(fd);
++    return;
++  }
++
++  // **增加当前目录名的匹配检查**
++  if(strcmp(fmtname((char *)path), name) == 0) {
++    printf("%s\n", path);  // 输出匹配的路径
++  }
++
++  // 如果当前路径是目录，递归查找
++  switch(st.type){
++  case T_FILE:
++    // 如果是文件并且名称匹配，已经输出，跳过
++    break;
++
++  case T_DIR:
++    if(strlen(path) + 1 + DIRSIZ + 1 > sizeof(buf)){
++      printf("find: path too long\n");
++      break;
++    }
++    strcpy(buf, path);
++    p = buf + strlen(buf);
++    *p++ = '/';
++
++    // 遍历目录中的每个文件或子目录
++    while(read(fd, &de, sizeof(de)) == sizeof(de)){
++      if(de.inum == 0)
++        continue;
++
++      // 忽略 "." 和 ".."
++      if(strcmp(de.name, ".") == 0 || strcmp(de.name, "..") == 0)
++        continue;
++
++      memmove(p, de.name, DIRSIZ);
++      p[DIRSIZ] = 0;
++
++      // 递归查找子目录
++      if(stat(buf, &st) < 0){
++        printf("find: cannot stat %s\n", buf);
++        continue;
++      }
++
++      find(buf, name);  // 递归调用
++    }
++    break;
++  }
++  close(fd);
++}
++
++int
++main(int argc, char *argv[]) {
++  if(argc != 3){
++    fprintf(2, "Usage: find <path> <name>\n");
++    exit(1);
++  }
++  
++  find(argv[1], argv[2]);
++  
++  exit(0);
++}
+\ No newline at end of file
+diff --git a/user/pingpong.c b/user/pingpong.c
+new file mode 100644
+index 0000000..7d9047d
+--- /dev/null
++++ b/user/pingpong.c
+@@ -0,0 +1,70 @@
++#include "kernel/types.h"
++#include "kernel/stat.h"
++#include "user/user.h"
++
++
++int
++main(void)
++{
++  int f2c[2]; // 父到子的管道
++  int c2f[2]; // 子到父的管道
++  char buf[1]; // 用于传输的缓冲区
++  int ppid = getpid();
++  int pid;
++
++  // 创建两个管道
++  if (pipe(f2c) < 0 || pipe(c2f) < 0) {
++    fprintf(2, "pipe failed\n");
++    exit(1);
++  }
++
++  if ((pid = fork()) < 0) {
++    fprintf(2, "fork failed\n");
++    exit(1);
++  }
++
++  if (pid == 0) {  // 子进程
++    close(f2c[1]); // 关闭父到子的写端
++
++    // 从父进程读取数据
++    if (read(f2c[0], buf, 1) != 1) {
++      fprintf(2, "child: read error\n");
++      exit(1);
++    }
++    printf("%d: received ping from pid %d\n", getpid(), ppid);
++
++    // 向父进程发送数据
++    if (write(c2f[1], "p", 1) != 1) {
++      fprintf(2, "child: write error\n");
++      exit(1);
++    }
++
++    close(f2c[0]); // 关闭父到子的读端
++    close(c2f[1]); // 关闭子到父的写端
++
++  } else {  // 父进程
++    close(f2c[0]); // 关闭父到子的读端
++    close(c2f[1]); // 关闭子到父的写端
++
++    // 向子进程发送数据
++    if (write(f2c[1], "p", 1) != 1) {
++      fprintf(2, "parent: write error\n");
++      exit(1);
++    }
++
++    // 从子进程读取数据
++    if (read(c2f[0], buf, 1) != 1) {
++      fprintf(2, "parent: read error\n");
++      exit(1);
++    }
++    printf("%d: received pong from pid %d\n", getpid(), pid);
++
++    close(f2c[1]); // 关闭父到子的写端
++    close(c2f[0]); // 关闭子到父的读端
++
++    // 等待子进程结束
++    wait(0);
++  }
++
++  exit(0);
++}
+\ No newline at end of file
+diff --git a/user/sleep.c b/user/sleep.c
+index db812c4..7f6a0dd 100644
+--- a/user/sleep.c
++++ b/user/sleep.c
+@@ -1 +1,17 @@
+-please change it!
+\ No newline at end of file
++#include "user/user.h"
++
++int
++main(int argc, char *argv[])
++{
++  if (argc != 2) {
++    fprintf(2, "Usage: sleep ticks\n");
++    exit(1);
++  }
++  int ticks = atoi(argv[1]);
++  if (ticks < 0) {
++    fprintf(2, "sleep: invalid number of ticks\n");
++    exit(1);
++  }
++  sleep(ticks);
++  exit(0);
++}
+diff --git a/user/user.c b/user/user.c
+new file mode 100644
+index 0000000..a95be7d
+--- /dev/null
++++ b/user/user.c
+@@ -0,0 +1,10 @@
++#include "kernel/types.h"
++#include "user.h"
++#include "kernel/fcntl.h"
++#include "kernel/syscall.h"
++
++int
++sleep(int ticks)
++{
++  return syscall(SYS_sleep, ticks);
++}
+diff --git a/user/user.h b/user/user.h
+index 739d534..219e608 100644
+--- a/user/user.h
++++ b/user/user.h
+@@ -1,3 +1,5 @@
++#include "kernel/types.h"
++
+ struct stat;
+ struct rtcdate;
+