modify some headers.

kernel/include/sleeplock.h

@@ -1,3 +1,10 @@
+#ifndef __SLEEPLOCK_H
+#define __SLEEPLOCK_H
+
+#include "include/spinlock.h"
+#include "include/types.h"
+
+
 // Long-term locks for processes
 struct sleeplock {
   uint locked;       // Is the lock held?
@@ -8,3 +15,4 @@ struct sleeplock {
   int pid;           // Process holding lock
 };
 
+#endif

kernel/include/spinlock.h

@@ -1,3 +1,8 @@
+#ifndef __SPINLOCK_H
+#define __SPINLOCK_H
+
+#include "include/proc.h"
+
 // Mutual exclusion lock.
 struct spinlock {
   uint locked;       // Is the lock held?
@@ -7,3 +12,4 @@ struct spinlock {
   struct cpu *cpu;   // The cpu holding the lock.
 };
 
+#endif

kernel/include/stat.h

@@ -1,3 +1,6 @@
+#ifndef __STAT_H
+#define __STAT_H
+
 #define T_DIR     1   // Directory
 #define T_FILE    2   // File
 #define T_DEVICE  3   // Device
@@ -18,3 +21,5 @@ struct stat {
 //   short nlink; // Number of links to file
 //   uint64 size; // Size of file in bytes
 // };
+
+#endif

kernel/include/syscall.h

@@ -1,3 +1,6 @@
+#ifndef __SYSCALL_H
+#define __SYSCALL_H
+
 // System call numbers
 #define SYS_fork    1
 #define SYS_exit    2
@@ -24,3 +27,5 @@
 #define SYS_dev    23
 #define SYS_dir    24
 #define SYS_getcwd 25
+
+#endif

kernel/include/types.h

@@ -1,3 +1,6 @@
+#ifndef __TYPES_H
+#define __TYPES_H
+
 typedef unsigned int   uint;
 typedef unsigned short ushort;
 typedef unsigned char  uchar;
@@ -12,3 +15,5 @@ typedef unsigned long uintptr_t;
 typedef uint64 pde_t;
 
 #define NULL ((void *)0)
+
+#endif

kernel/include/virtio.h

@@ -1,3 +1,6 @@
+#ifndef __VIRTIO_H
+#define __VIRTIO_H
+
 //
 // virtio device definitions.
 // for both the mmio interface, and virtio descriptors.
@@ -70,3 +73,5 @@ struct UsedArea {
   uint16 id;
   struct VRingUsedElem elems[NUM];
 };
+
+#endif