lovelove工作

C13-Linux系统编程/fs/timelog.c

@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+#define FNAME   "time.log"
+#define BUFSIZE 1024
+
+/**
+ * @brief    往文件里面输出时间戳
+ * @details
+ *           实例格式：2019-12-12 12:12:12
+ *
+ * @param    argc
+ * @param    argv
+ *
+ * @return  int
+ */
+int main(int argc, char **argv)
+{
+    FILE      *fp;
+    time_t     stamp;
+    struct tm *tm;
+    char       buf[BUFSIZE];
+    int        count = 0;
+
+    fp = fopen(FNAME, "a+");
+    if (fp == NULL)
+    {
+        perror("fopen()");
+        exit(1);
+    }
+
+    while (fgets(buf, BUFSIZE, fp) != NULL)
+        count++;
+
+    while (1)
+    {
+        stamp = time(NULL);
+
+        tm = localtime(&stamp);
+        if (NULL == tm)
+        {
+            perror("localtime()");
+            exit(1);
+        }
+
+        strftime(buf, BUFSIZE, "%Y-%m-%d %H:%M:%S", tm);
+
+        fprintf(fp, "%-4d%s\n", ++count, buf);
+
+        /*
+         *  加了sleep(1)之后就没有输出？
+         *  全缓冲
+         *  因为缓冲区没有满，没有刷新到文件里面
+         */
+        fflush(fp);
+
+        sleep(1);
+    }
+
+    fclose(fp);
+    exit(0);
+}
+
+//! 最终效果
+// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ ./test
+// ^C
+// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ cat time.log
+// 1   2024-05-11 21:53:26
+// 2   2024-05-11 21:53:27
+// 3   2024-05-11 21:53:28
+// 4   2024-05-11 21:53:29
+// 5   2024-05-11 21:53:30
+// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ ./test
+// ^C
+// *[main][~/Linux-C-Notes/C13-Linux系统编程/fs]$ cat time.log
+// 1   2024-05-11 21:53:26
+// 2   2024-05-11 21:53:27
+// 3   2024-05-11 21:53:28
+// 4   2024-05-11 21:53:29
+// 5   2024-05-11 21:53:30
+// 6   2024-05-11 21:53:35
+// 7   2024-05-11 21:53:36
+// 8   2024-05-11 21:53:37
+// 9   2024-05-11 21:53:38