zvfs: 完成open/close/read/write/unlink的hook动态库代码编写、编译与简单功能测试。

func_test.c

@@ -1,40 +1,48 @@
-#define _GNU_SOURCE
-#include <errno.h>
-#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
+#include <fcntl.h>
 #include <unistd.h>
 
 int main(int argc, char **argv)
 {
     const char *path = "/zvfs/func_test.dat";
-    if (argc > 2 && strcmp(argv[1], "-f") == 0) path = argv[2];
-    setenv("ZVFS_ROOT", "/zvfs", 0);
 
     printf("open: %s\n", path);
-    int fd = open(path, O_CREAT|O_RDWR, 0644);
+    int fd = open(path, O_CREAT | O_RDWR | O_TRUNC, 0644);
     if (fd < 0) { perror("open"); return 1; }
 
-    const char *msg = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    const char *msg = "ABCDEFGHIJKL";
     ssize_t w = write(fd, msg, strlen(msg));
     if (w < 0) { perror("write"); return 2; }
     printf("write: %zd\n", w);
 
-    /* Rewind by closing and reopening for read */
+    const char *msg2 = "MNOPQRSTUVWXYZ";
+    ssize_t w2 = write(fd, msg2, strlen(msg2));
+    if (w2 < 0) { perror("write"); return 2; }
+    printf("write: %zd\n", w2);
+
     close(fd);
+
+
     fd = open(path, O_RDONLY);
     if (fd < 0) { perror("open R"); return 3; }
 
-    char buf[256]; memset(buf, 0, sizeof(buf));
+    char buf[10];
+    memset(buf, 0, sizeof(buf));
     ssize_t r = read(fd, buf, sizeof(buf));
     if (r < 0) { perror("read"); return 4; }
     printf("read: %zd bytes: %.*s\n", r, (int)r, buf);
+
+    char buf2[512];
+    memset(buf2, 0, sizeof(buf2));
+    ssize_t r2 = read(fd, buf2, sizeof(buf2));
+    if (r2 < 0) { perror("read"); return 4; }
+    printf("read: %zd bytes: %.*s\n", r2, (int)r2, buf2);
+
     close(fd);
 
     if (unlink(path) != 0) { perror("unlink"); return 5; }
     printf("unlink: ok\n");
     return 0;
-}
+}