void RunCmd(commandT** cmd, int n)
{
int i;
total_task = n;
// checkAlias(cmd,n);
if ((*cmd)->is_redirect_out)
{
(*cmd)->is_redirect_out = 0;
RunCmdRedirOut(*cmd, (*cmd)->redirect_out);
}
else if ((*cmd)->is_redirect_in)
{
(*cmd)->is_redirect_in = 0;
RunCmdRedirIn(*cmd, (*cmd)->redirect_in);
}
else if(n == 1)
RunCmdFork(cmd[0], TRUE);
else{
RunCmdMultiPipe(cmd,n);
for(i = 0; i < n; i++)
ReleaseCmdT(&cmd[i]);
}
}
void
RedirectIO(commandT* cmd, int* stdinFd, int* stdoutFd){
int i = 0;
bool hasRedirection = FALSE;
while (cmd->argv[i] != 0){
if (cmd->argv[i][0] == '<'){
//printf("Found '<'.\n");
RunCmdRedirIn(cmd, cmd->argv[i+1], stdinFd);
hasRedirection = TRUE;
}
else if (cmd->argv[i][0] == '>'){
//printf("Found '>'. Next: %s\n", cmd->argv[i+1]);
RunCmdRedirOut(cmd, cmd->argv[i+1], stdoutFd);
hasRedirection = TRUE;
}
i++;
}
if (hasRedirection){
/*Updating argv*/
i=0;
while ((cmd->argv[i][0] != '>') && (cmd->argv[i][0] != '<')){
i++;
}
/*Free arguments from index i and higher*/
while (cmd->argv[i] != 0){
free(cmd->argv[i]);
cmd->argv[i] = 0;
cmd->argc--;
i++;
}
}
return;
}
static void Exec(commandT* cmd, bool forceFork)
{
pid_t pid;
//printf("%s \n",cmd->name);
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask,SIGCHLD);
sigaddset(&mask,SIGINT);
sigaddset(&mask,SIGTSTP);
//blocks the signals specified above, before calling the children
sigprocmask(SIG_BLOCK, &mask, NULL);
pid = fork();
//check for fork error
if (pid < 0){
perror("Fork Error\n");
}
// //successful fork
// else {
if (pid==0){
//child
setpgid(0, 0);
//unblocks the signals specified above
sigprocmask(SIG_UNBLOCK, &mask, NULL);
//check for redirections
if (cmd->is_redirect_in==1){
RunCmdRedirIn(cmd, cmd->redirect_in);
}
if (cmd->is_redirect_out==1){
RunCmdRedirOut(cmd,cmd->redirect_out);
}
execv(cmd->name,cmd->argv);
}
else{
//parent
sigprocmask(SIG_UNBLOCK, &mask, NULL);
//we add the job to the background if it was specified as background
if (cmd->bg ==1){
AddJob(pid,BACKGROUND, cmd->cmdline); //add job to background jobs
}
//otherwise the job goes in the foreground
else {
//printf("Adding job %d \n",pid);
fgpid = pid;
AddJob(pid, FOREGROUND, cmd->cmdline);
//in the foreground, so go wait for it to finish
WaitFg(pid);
}
}
//}
}
static void RunBuiltInCmd(commandT* cmd)
{
int status;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask,SIGCHLD);
int pid=fork();
if(pid == 0)
{
if ((cmd->is_redirect_in==1) && (cmd->is_redirect_out==1)){
RunCmdRedirInOut(cmd,cmd->redirect_in,cmd->redirect_out);
}else if (cmd->is_redirect_in==1){
RunCmdRedirIn(cmd,cmd->redirect_in);
}else if(cmd->is_redirect_out==1){
RunCmdRedirOut(cmd,cmd->redirect_out);
}
setpgid(0, 0);
execv(cmd->name , cmd->argv);
}else if(pid < 0)
perror("Fork Error, in RunBuiltInCmd");
else {
{
if(cmd[0].bg==0){
fgpid = pid;
waitpid(pid,&status,WUNTRACED);
if(WTERMSIG(status) == 127){
// stopped by SIGTSTP
fgpid=-1;
//add it to backbground
addToBg(pid,cmd,2);
}
return;
}else if (cmd[0].bg==1){
sigprocmask(SIG_UNBLOCK,&mask,NULL);
//run command background
//add the bg process to the bgjoblist
addToBg(pid,cmd,0);
}
}
}
}
void RunCmd(commandT** cmd, int n)
{
int i;
total_task = n;
if(n == 1)
if (cmd[0]->is_redirect_in && cmd[0]->is_redirect_out){
RunCmdRedir(cmd);
}
else if (cmd[0]->is_redirect_in){
RunCmdRedirIn(cmd[0], cmd[0]->redirect_in);
}
else if (cmd[0]->is_redirect_out){
RunCmdRedirOut(cmd[0], cmd[0]->redirect_out);
}
else {
RunCmdFork(cmd[0], TRUE);
}
else{
RunCmdPipe(cmd[0], cmd[1]);
for(i = 0; i < n; i++)
ReleaseCmdT(&cmd[i]);
}
}
/*
* RunCmd
*
* arguments:
* commandT *cmd: the command to be run
*
* returns: none
*
* Runs the given command. Initializes globals.
*/
void
RunCmd(commandT* cmd)
{
int redirstatus=0;
int pipestatus=0;
int bgstatus=0;
int i;
char redirfile[MAXLINE];
if ((cmd->argc - 1 >= 0) && cmd->argv[cmd->argc - 1][0] == '&') { //we need to background
free(cmd->argv[cmd->argc-1]);
cmd->argv[cmd->argc-1] = 0;
cmd->argc--;
bgstatus = 1;
}
if( ( cmd->argc-2>=0 ) && (cmd->argv[cmd->argc-2][0] == '>') ){//we get the redir out.
strcpy(redirfile,cmd->argv[cmd->argc-1]);
free(cmd->argv[cmd->argc-2]);//wo don't need it anymore
free(cmd->argv[cmd->argc-1]);
cmd->argv[cmd->argc-2] = 0;
cmd->argv[cmd->argc-1] = 0;
cmd->argc=cmd->argc-2;
RunCmdRedirOut(cmd, redirfile);//redirect output
redirstatus=1;
}
else if( ( cmd->argc-2>=0 ) && ( cmd->argv[cmd->argc-2][0] == '<') ){//we get the redir in
strcpy(redirfile,cmd->argv[cmd->argc-1]);
free(cmd->argv[cmd->argc-2]);//wo don't need it anymore
free(cmd->argv[cmd->argc-1]);
cmd->argv[cmd->argc-2] = 0;
cmd->argv[cmd->argc-1] = 0;
cmd->argc=cmd->argc-2;
RunCmdRedirIn(cmd, redirfile);//redirect input
redirstatus=1;
}
else
for(i = 0; i < cmd->argc; ++i)
{
if(cmd->argv[i][0] == '|')
{
pipestatus=i;
break;
}
else if(cmd->argv[i][0] == '~')
{
char* tempcmd=malloc( sizeof(char) * ( strlen(cmd->argv[i]) + strlen(getenv("HOME")) ) );
strcpy(tempcmd,getenv("HOME"));
strcat(tempcmd,cmd->argv[i]+1);
free(cmd->argv[i]);
cmd->argv[i]=tempcmd;
}
}
if(redirstatus==1)
{
;
}
else if(pipestatus > 0)
{
commandT* cmd1 = malloc(sizeof(commandT) + sizeof(char*) * cmd->argc);
commandT* cmd2 = malloc(sizeof(commandT) + sizeof(char*) * cmd->argc);
char* tmp = cmd->argv[pipestatus];
cmd->argv[pipestatus]=0;
/* copy the cmd before '|' to cmd1 */
cmd1->name = cmd->argv[0];
cmd1->argc = pipestatus;
for(i = 0; cmd->argv[i] != 0; ++i)
{
cmd1->argv[i] = cmd->argv[i];
}
cmd1->argv[i]=0;
/* copy the cmd after '|' to cmd2 */
cmd2->name = cmd->argv[pipestatus+1];
cmd2->argc = cmd->argc-pipestatus-1;
for(i = pipestatus +1; cmd->argv[i] != 0; ++i)
{
cmd2->argv[i-pipestatus-1] = cmd->argv[i];
}
cmd2->argv[i-pipestatus-1] = 0;
cmd->argv[pipestatus]=tmp; //restore the cmd->argv[pipestatus]
RunCmdPipe(cmd1,cmd2);
}
else {
if (bgstatus)
RunCmdFork(cmd, FALSE);
else
RunCmdFork(cmd, TRUE);
}
} /* RunCmd */
