void
PlaygroundUnlinkTask::exec(void)
{
switch (getType()) {
case Task::TYPE_COM:
execCom();
break;
case Task::TYPE_FS:
execFs();
break;
}
}
int main(int argc,char* argv[]){
//获取当前路径
int i=0;
for(i=0;i<argc;i++){
puts(argv[i]);
}
char command[1000]; //限制命令长度为999个字符
int comBegPos[20];
char **args;
short argNum=0;
pid_t child_id;
int redirectPos=0;
char*redirectedFileName;
int fd[2];
int readPipe;
int comNum=0;
int lastOut[2];
getCurPath(curPath);
printf("%s$",curPath);
gets(command);
while(strcmp(command,"exit")!=0){
getComAndArgs(command,&args,&argNum);
comNum=getComNum(args,argNum,comBegPos);
getComNumAndRedirectedPos(args,&comNum,&redirectPos);
printf("command:%s,redirectPos:%d\n",command,redirectPos);
printf("\n\ncommandInfo\ncomNum=%d,isRedirected:%d\n",comNum,redirectPos);
for(i=0;i<argNum;i++){
if(args[i]==NULL){
puts("NULL");
}else{
puts(args[i]);
}
}
for(i=0;i<comNum;i++){
printf("pos:%d\t",comBegPos[i]);
}
printf("\n\n\ncontent below:\n");
lastOut[1]=1;
if(redirectPos!=0)
{
pipe(lastOut);
redirectedFileName=args[comBegPos[comNum-1]+redirectPos]+1;
args[comBegPos[comNum-1]+redirectPos]=NULL;
}
if(comNum==1){
//just one command and no pipe
execCom(0,lastOut[1],args);
}else{
//Given that if pipe(fd) ,fd[0]>0&&fd[1]>0;
for(i=0;i<comNum;i++){
if(i==0){
//the first one
pipe(fd);
readPipe=0;
execCom(readPipe,fd[1],args+comBegPos[i]);
}else if(i==comNum-1){
//the last one
close(fd[1]);
if(readPipe!=0)
close(readPipe);
readPipe=fd[0];
execCom(readPipe,lastOut[1],args+comBegPos[i]);
}
else{
//not first nor last
close(fd[1]);
if(readPipe!=0)
close(readPipe);
readPipe=fd[0];
pipe(fd);
execCom(readPipe,fd[1],args+comBegPos[i]);
}
}
if(readPipe!=0)
close(readPipe);
}
//has redirectPos and the result must in lastOut[0];
if(redirectPos!=0){
int file=open(redirectedFileName,O_RDWR|O_CREAT,S_IRWXU);
char buffer[10000];
int len;
len=read(lastOut[0],buffer,10000);
write(file,buffer,len);
close(file);
close(lastOut[0]);
close(lastOut[1]);
}
int k=0;
for(k=0;k<argNum;k++){
// puts(args[k]);
if(args[k]!=NULL);
free(args[k]);
}
free(args);
printf("%s$",curPath);
gets(command);
}
puts("sh3.c结束运行");
}
