add lab answers

labcodes_answer/lab5_result/libs/error.h

@@ -0,0 +1,33 @@
+#ifndef __LIBS_ERROR_H__
+#define __LIBS_ERROR_H__
+
+/* kernel error codes -- keep in sync with list in lib/printfmt.c */
+#define E_UNSPECIFIED       1   // Unspecified or unknown problem
+#define E_BAD_PROC          2   // Process doesn't exist or otherwise
+#define E_INVAL             3   // Invalid parameter
+#define E_NO_MEM            4   // Request failed due to memory shortage
+#define E_NO_FREE_PROC      5   // Attempt to create a new process beyond
+#define E_FAULT             6   // Memory fault
+#define E_SWAP_FAULT        7   // SWAP READ/WRITE fault
+#define E_INVAL_ELF         8   // Invalid elf file
+#define E_KILLED            9   // Process is killed
+#define E_PANIC             10  // Panic Failure
+#define E_TIMEOUT           11  // Timeout
+#define E_TOO_BIG           12  // Argument is Too Big
+#define E_NO_DEV            13  // No such Device
+#define E_NA_DEV            14  // Device Not Available
+#define E_BUSY              15  // Device/File is Busy
+#define E_NOENT             16  // No Such File or Directory
+#define E_ISDIR             17  // Is a Directory
+#define E_NOTDIR            18  // Not a Directory
+#define E_XDEV              19  // Cross Device-Link
+#define E_UNIMP             20  // Unimplemented Feature
+#define E_SEEK              21  // Illegal Seek
+#define E_MAX_OPEN          22  // Too Many Files are Open
+#define E_EXISTS            23  // File/Directory Already Exists
+#define E_NOTEMPTY          24  // Directory is Not Empty
+/* the maximum allowed */
+#define MAXERROR            24
+
+#endif /* !__LIBS_ERROR_H__ */
+