void execMoreCmd(SimpleCmd *cmd, SimpleCmd *cmd2){
pid_t pid[2];
int pipe_fd[2];
if(pipe(pipe_fd) < 0){
printf("pipe error");
return;
}
if((pid[0] = fork()) < 0){
perror("fork failed");
return;
}
if(!pid[0]) // child process
{
close(pipe_fd[0]);
dup2(pipe_fd[1], 1);
close(pipe_fd[1]);
execSimpleCmd(cmd);
exit(0);
}
if(pid[0]) // father process
{
waitpid(pid[0], NULL, 0);
// printf("first father %s\n", cmd->args[0]);
if((pid[1] = fork()) < 0)
{
perror("fork failed");
return;
}
if(!pid[1]) // child process
{
close(pipe_fd[1]);
dup2(pipe_fd[0], 0);
close(pipe_fd[0]);
if(cmd2->nextCmd != NULL)
execMoreCmd(cmd2, cmd2->nextCmd);
else
execSimpleCmd(cmd2);
exit(0);
}
// father process
// printf("second father %s\n", cmd->args[0]);
close(pipe_fd[0]);
close(pipe_fd[1]);
waitpid(pid[1], NULL, 0);
}
}
/*******************************************************
命令执行接口
********************************************************/
void execute(){
SimpleCmd *cmd;
#ifdef DEBUG
SimpleCmd *pcmd;
#endif
if(checkwildcard()==1){
create_shell();
initBashCmd();
execBashCmd();
return ;
}
cmd = handleSimpleCmdStr(0, strlen(inputBuff));
if(cmd->nextCmd!=NULL){
#ifdef DEBUG
pcmd=cmd;
do{
printf("%s\n",pcmd->args[0]);
pcmd=pcmd->nextCmd;
}while(pcmd!=NULL);
#endif
if(execPipeCmd(cmd,cmd->nextCmd)){
printf("pipe error\n");
}
free(cmd->nextCmd);
}
else{
execSimpleCmd(cmd);
}
}
/*******************************************************
命令执行接口
********************************************************/
void execute(){
SimpleCmd *cmd = handleSimpleCmdStr(0, strlen(inputBuff));
if(cmd->ifpipeline==0)
execSimpleCmd(cmd);
while(cmd->ifpipeline==1)
{
SimpleCmd *cmd2 = handleSimpleCmdStr(0, strlen(inputBuff));
pipecmd(cmd,cmd2);
free(cmd);
cmd=cmd2;
}
}
void handleCmdStr(int begin, int end){
int i, j, k, ordernum = 0;
SimpleCmd *cmd0 = NULL, *cmd1 = NULL, *cmd = NULL;
for(i = j = begin; i < end; i ++)
{
if(inputBuff[i] == '|' || i == end-1)
{
if(i == end-1)
{
cmd1 = handleSimpleCmdStr(j, i+1);
}
else
{
cmd1 = handleSimpleCmdStr(j, i);
}
if(cmd == NULL)
cmd = cmd0 = cmd1;
else
{
cmd0->nextCmd = cmd1;
cmd0 = cmd1;
}
j = i + 1;
}
}
if(cmd->nextCmd != NULL)
execMoreCmd(cmd, cmd->nextCmd);
else
execSimpleCmd(cmd);
// execSimpleCmd(cmd);
// while(cmd != NULL)
// {
// printf("%s exec %s ==> %s\n", cmd->args[0], cmd->input, cmd->output);
// execSimpleCmd(cmd);
// cmd = cmd->nextCmd;
// }
}
//execute a set of CMDs by constroy
void executeComplexCmd(ComplexCmd *cmd) {
int i;
pid_t pid;
int pfd[2][2]={{0,1},{0,1}};
cidCnt = 0;
for (i = 0; i<cmd->num; ++i) {
if (i == cmd->num - 1) {
pfd[1][1] = 1;
}
else {
if (pipe(pfd[1]) == -1) {
perror("pipe failed");
exit(errno);
}
}
pid = fork();
if (pid < 0) {
perror("fork failed");
exit(errno);
} else if (pid) {
fgCid[cidCnt++] = pid;
if (pfd[0][0] != 0) close(pfd[0][0]);
if (pfd[1][1] != 1) close(pfd[1][1]);
pfd[0][0]=pfd[1][0];
} else {
dup2(pfd[0][0],0);
dup2(pfd[1][1],1);
execSimpleCmd(cmd->cmds[i]);
close(pfd[0][0]);
close(pfd[1][1]);
exit(0);
}
}
if (pfd[0][0] != 0) close(pfd[0][0]);
//wait for all child processes to exit
while ((pid=wait(NULL))>0);
//free cmds[]
for (i = 0; i<cmd->num; ++i) free(cmd->cmds[i]);
}
//执行管道指令
int execPipeCmd(SimpleCmd *cmd1,SimpleCmd *cmd2){
int status;
int pid[2];
int pipe_fd[2];
//创建管道
if(pipe(pipe_fd)<0){
perror("pipe failed");
return -1;
}
//为cmd1创建进程
if((pid[0]=fork())<0){
perror("fork failed");
return -1;
}
if(!pid[0]){
/*子进程*/
/*将管道的写描述符复制给标准输出，然后关闭*/
close(pipe_fd[0]);
dup2(pipe_fd[1],1);
close(pipe_fd[1]);
/*执行cmd1*/
execSimpleCmd(cmd1);
exit(0);
}
if(pid[0]){
/*父进程*/
waitpid(pid[0],&status,0);
/*为cmd2创建子进程*/
if((pid[1]=fork())<0){
perror("fork failed");
return -1;
}
if(!pid[1]){
/*子进程*/
/*将管道的读描述符复制给标准输入*/
close(pipe_fd[1]);
dup2(pipe_fd[0],0);
close(pipe_fd[0]);
/*执行cmd2*/
// printf("execute cmd2\n");
if(cmd2->nextCmd!=NULL){
// printf("pipe2 ok\n");
if(execPipeCmd(cmd2,cmd2->nextCmd)){
printf("pipe error\n");
}
free(cmd2->nextCmd);
}
else{
execSimpleCmd(cmd2);
}
exit(0);
}
close(pipe_fd[0]);
close(pipe_fd[1]);
waitpid(pid[1],&status,0);
}
return 0;
}
/*******************************************************
命令执行接口
********************************************************/
void execute(){
SimpleCmd *cmd = handleSimpleCmdStr(0, strlen(inputBuff));
execSimpleCmd(cmd);
}
