68 lines
2.6 KiB
C
68 lines
2.6 KiB
C
// sysdep.h
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// System-dependent interface. Nachos uses the routines defined
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// here, rather than directly calling the UNIX library functions, to
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// simplify porting between versions of UNIX, and even to
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// other systems, such as MSDOS and the Macintosh.
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//
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// Copyright (c) 1992-1993 The Regents of the University of California.
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// All rights reserved. See copyright.h for copyright notice and limitation
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// of liability and disclaimer of warranty provisions.
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#ifndef SYSDEP_H
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#define SYSDEP_H
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#include "copyright.h"
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// Check file to see if there are any characters to be read.
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// If no characters in the file, return without waiting.
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extern bool PollFile(int fd);
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// File operations: open/read/write/lseek/close, and check for error
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// For simulating the disk and the console devices.
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extern int OpenForWrite(const char *name);
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extern int OpenForReadWrite(const char *name, bool crashOnError);
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extern void Read(int fd, void *buffer, int nBytes);
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extern int ReadPartial(int fd, void *buffer, int nBytes);
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extern void WriteFile(int fd, const void *buffer, int nBytes);
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extern void Lseek(int fd, int offset, int whence);
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extern int Tell(int fd);
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extern void Close(int fd);
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extern bool Unlink(const char *name);
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// Interprocess communication operations, for simulating the network
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extern int OpenSocket();
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extern void CloseSocket(int sockID);
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extern void AssignNameToSocket(const char *socketName, int sockID);
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extern void DeAssignNameToSocket(const char *socketName);
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extern bool PollSocket(int sockID);
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extern void ReadFromSocket(int sockID, void *buffer, int packetSize);
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extern void SendToSocket(int sockID, const void *buffer, int packetSize,const char *toName);
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// Process control: abort, exit, and sleep
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extern void Abort();
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extern void Exit(int exitCode);
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extern void Delay(int seconds);
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// Initialize system so that cleanUp routine is called when user hits ctl-C
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extern void CallOnUserAbort(VoidNoArgFunctionPtr cleanUp);
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extern void BlockUserAbort(void);
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extern void UnBlockUserAbort(void);
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// Initialize the pseudo random number generator
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extern void RandomInit(unsigned seed);
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extern int Random();
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// Allocate, de-allocate an array, such that de-referencing
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// just beyond either end of the array will cause an error
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extern char *AllocBoundedArray(int size);
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extern void DeallocBoundedArray(char *p, int size);
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// Other C library routines that are used by Nachos.
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// These are assumed to be portable, so we don't include a wrapper.
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extern "C" {
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#include <stdlib.h> // for atoi, atof, abs
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#include <stdio.h> // for printf, fprintf
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#include <string.h> // for DEBUG, etc.
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}
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#endif // SYSDEP_H
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