void execute(cmdList list, cmdLine *pCmdLine){
int **pipes;
int *currPipe;
cmdLine *cmdline = pCmdLine;
int i = 0;
int count = countCmds(cmdline);
pipes = createPipes(count -1);
while(i<count){
pid_t pid = fork();
if(pid == -1 ){
perror("fork() ");
return;
}
if(pid == 0 ){
if(count>1){
if(cmdline->idx != 0){
currPipe = leftPipe(pipes,cmdline);
close(0);
dup2(currPipe[0],0);
close(currPipe[0]);
}
if(cmdline->next != NULL){
currPipe = rightPipe(pipes,cmdline);
close(1);
dup2(currPipe[1],1);
close(currPipe[1]);
}
}
if(cmdline->inputRedirect != NULL){
close(0);
fopen(cmdline->inputRedirect, "r");
}
if(cmdline->outputRedirect != NULL){
close(1);
fopen(cmdline->outputRedirect, "w");
}
execvp(cmdline->arguments[0], cmdline->arguments);
perror("Error: ");
freeCmdLines(pCmdLine);
freeCmdList(list);
releasePipes(pipes,count - 1);
_exit(errno);
}
else{
currPipe = leftPipe(pipes,cmdline);
if(currPipe != NULL)
close(currPipe[0]);
currPipe = rightPipe(pipes,cmdline);
if(currPipe != NULL)
close(currPipe[1]);
if((cmdline->blocking)==1){
int status;
waitpid(pid,&status,0);
}
}
cmdline=cmdline->next;
i++;
}
releasePipes(pipes,count-1);
}
void testFunc(cmdLine *cmdline){
cmdLine *counter = cmdline;
while(counter -> next)
counter = counter -> next;
int **pipes = createPipes(counter-> idx);
if(leftPipe(pipes,cmdline) == NULL)
printf("Left pipe of ls is null\n");
if(rightPipe(pipes,counter) == NULL)
printf("Right pipe of more is null\n");
cmdLine *tee = cmdline->next;
printf("fd left pipe: input %d,output %d. fd right pipe: input %d,output %d. \n",leftPipe(pipes,tee)[0],leftPipe(pipes,tee)[1],rightPipe(pipes,tee)[0],rightPipe(pipes,tee)[1]);
releasePipes(pipes,counter->idx);
}
List* execString(cmdLog* cLog, List* env, char* incoming) {
cmdLine* line;
cmdLine* firstLine;
cmdLine* currLine;
int pipeCounter = 0;
int * pid;
int pid2;
int i;
int j;
int **pipefd;
line = parseCmdLines(incoming);
currLine = line;
firstLine = line;
if (line==NULL || !strcmp(line->arguments[0], "quit")) {
freeList(env);
freeCmdLines(line);
return (List*)-1;
}
line= cmdEnvReplace(env, line);
if (!strcmp(line->arguments[0], "assign")) {
env= cmdAssign(env, line);
}
else if (!strcmp(line->arguments[0], "unassign")) {
env= cmdUnassign(env, line);
}
else if (!strcmp(line->arguments[0], "cd")) {
cmdCD(cLog, line, incoming);
}
else if (line->arguments[0][0]=='!') {
env= cmdReadLog(cLog, env, line);
}
else {
j = 0;
pushArray(cLog, incoming);
if(line->next) {
while(currLine != NULL) {
currLine = currLine->next;
pipeCounter++;
}
pipefd= createPipes(pipeCounter-1);
pid = (int *)malloc(pipeCounter * sizeof(int));
if (!(pid[j] =fork())) { /* first son*/
close(STDOUT_FILENO); /* Close unused write end */
dup(rightPipe(pipefd, line)[1]);
close(rightPipe(pipefd, line)[1]);
coreExec(cLog, env, line);
}
close(rightPipe(pipefd, line)[1]);
j++;
line = line->next;
for (i=0; i<pipeCounter-2; i++) {
if (!(pid[j] =fork())) { /* first son*/
close(STDOUT_FILENO); /* Close unused write end */
dup(rightPipe(pipefd, line)[1]);
close(rightPipe(pipefd, line)[1]);
close(STDIN_FILENO);
dup(leftPipe(pipefd, line)[0]);
close(leftPipe(pipefd, line)[0]);
coreExec(cLog, env, line);
}
close(leftPipe(pipefd, line)[0]);
close(rightPipe(pipefd, line)[1]);
j++;
line = line->next;
}
if (!(pid[j] =fork())) { /* first son*/
close(STDIN_FILENO); /* Close unused write end */
dup(leftPipe(pipefd, line)[0]);
close(leftPipe(pipefd, line)[0]);
coreExec(cLog, env, line);
}
close(leftPipe(pipefd, line)[0]);
for(i=0; i<=j; i++) {
if(line->blocking!=0) {
waitpid(pid[i],0,0);
}
}
releasePipes(pipefd, pipeCounter-1);
} else {
if (!(pid2=fork())) {
coreExec(cLog, env, line);
}
}
if(line->blocking!=0) {
waitpid(pid2,0,0);
}
}
freeCmdLines(firstLine);
free(pid);
return env;
}