os_kernel_lab/code/lab4/libs/error.h

#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__ */