《操作系统》的实验代码。
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#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
/* the maximum allowed */
#define MAXERROR 6
#endif /* !__LIBS_ERROR_H__ */