void openPipe(){
currentPipe = newPipe(); // new pipe
if(lastPipe == NULL){
lastPipe = currentPipe;
}
if(!currentPipe)
fprintf(stderr, "\n current pipe is null");
if(!lastPipe)
fprintf(stderr, "\n last pipe is null");
}
bool InterprocessConnection::createPipe (const String& pipeName, int timeoutMs, bool mustNotExist)
{
disconnect();
std::unique_ptr<NamedPipe> newPipe (new NamedPipe());
if (newPipe->createNewPipe (pipeName, mustNotExist))
{
const ScopedLock sl (pipeAndSocketLock);
pipeReceiveMessageTimeout = timeoutMs;
initialiseWithPipe (newPipe.release());
return true;
}
return false;
}
void executePipe(char *line, char *cmd) {
int bgFg = getFgBg(cmd); /* fg(0) or bg(1) */
int status;
pid_t pid = fork();
if(pid < 0) {
perror("Fork error, pid < 0");
/* parent */
} else if(pid > 0) {
/* set process group ID of child to self pid */
/* will suspend when receive SIGTTIN and SIGTTOU signals */
setpgid(pid, pid);
/* set terminal control to new process group with child */
tcsetpgrp(STDIN_FILENO, pid);
/* insert process in the list */
insertProcess(pid, bgFg, cmd);
if(processList.current->process.status == FOREGROUND) {
/* wait child finish */
waitpid(pid, &status, WUNTRACED);
}
/* parent regains terminal control */
tcsetpgrp(STDIN_FILENO, getpgid(0));
/* child */
} else {
/* signals SIGTSTP and SIGINT will show default behavior in child */
defaultSignals();
/* set group id of child to self pid */
/* suspend when receive signals SIGTTIN and SIGTTOUT */
/* the child could go through exec before the parent set the group */
setpgid(0, 0);
int startLine = 0; /* search begin of next expression */
int start, end; /* expression delimiters */
char *previousCmd;
/* while find commands between pipes */
while(setExpressionDelimiters(line + startLine,
"[^| ]([^|]*[^| ])?", &start, &end)) {
previousCmd = cmd;
/* get current command */
cmd = getExpression(line + startLine, start, end, 0);
/* go to next search */
startLine += end;
/* file input and output of pipe */
int file[2];
pid_t pid;
newPipe(file, &pid);
/* parent */
if(pid > 0) {
readPipe(file);
/* child */
} else {
writePipe(file);
internalExternalPipe(previousCmd, NO_JOBS_CONTROL);
}
}
/* execute last command */
internalExternalPipe(cmd, NO_JOBS_CONTROL);
}
}
