🦄 refactor(C13, C14, C115): 更新了linux系统开发部分的结构

C13-IO/stdio/maxfopen.c

@@ -0,0 +1,32 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main()
+{
+    FILE *fp    = NULL;
+    int   count = 0;
+
+
+    while (1)
+    {
+
+        fp = fopen("tmp", "w");
+        if (NULL == fp)
+        {
+            perror("fopen()");
+            break;
+        }
+
+        count++;
+    }
+
+    printf("count = %d\n", count);
+    // out: 4089
+    /* 可以通过下面这个命令限制 */
+    /* ulimit -n */
+    /* 4096 */
+
+    exit(0);
+}