79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/**************************************************************
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*
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* userprog/ksyscall.h
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*
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* Kernel interface for systemcalls
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*
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* by Marcus Voelp (c) Universitaet Karlsruhe
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*
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**************************************************************/
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#ifndef __USERPROG_KSYSCALL_H__
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#define __USERPROG_KSYSCALL_H__
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#define INT_BUF_LENGTH 13
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#include "kernel.h"
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#include "synchconsole.h"
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void SysHalt()
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{
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kernel->interrupt->Halt();
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}
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int SysAdd(int op1, int op2)
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{
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return op1 + op2;
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}
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int SysCreate(char *filename)
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{
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// return value
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// 1: success
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// 0: failed
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return kernel->interrupt->CreateFile(filename);
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}
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void SysPrintInt(int value) {
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kernel->interrupt->PrintInt(value);
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}
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OpenFileId SysOpen(char *name) {
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OpenFileId id = -1;
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for (int i = 0; i < 20; i++)
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if (kernel->fileSystem->fileDescriptorTable[i] == NULL) {
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id = i;
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kernel->fileSystem->fileDescriptorTable[i]
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= kernel->fileSystem->Open(name);
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if (kernel->fileSystem->fileDescriptorTable[i] == NULL)
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return -1;
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break;
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}
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return id;
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}
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int SysWrite(char *buffer, int size, OpenFileId id) {
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if (id < 0 || id >= 20 || kernel->fileSystem->fileDescriptorTable[id] == NULL)
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return -1;
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return kernel->fileSystem->fileDescriptorTable[id]->Write(buffer, size);
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}
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int SysRead(char *buffer, int size, OpenFileId id) {
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if (id < 0 || id >= 20 || kernel->fileSystem->fileDescriptorTable[id] == NULL)
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return -1;
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return kernel->fileSystem->fileDescriptorTable[id]->Read(buffer, size);
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}
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int SysClose(OpenFileId id) {
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if (id < 0 || id >= 20 || kernel->fileSystem->fileDescriptorTable[id] == NULL)
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return 0;
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delete kernel->fileSystem->fileDescriptorTable[id];
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kernel->fileSystem->fileDescriptorTable[id] = NULL;
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return 1;
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}
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#endif /* ! __USERPROG_KSYSCALL_H__ */
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