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#include "ProcessUtilities.h"
#include <sys/wait.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <vector>
class ProcessInfo
{
public:
int PID;
int StdOutput;
int StdError;
ProcessController* Master;
bool cycleStandardOutput();
bool cycleStandardError();
void waitForFinish();
};
void ProcessInfo::waitForFinish()
{
int ret=0;
waitpid(PID,&ret,0);
if (WIFEXITED(ret))
{
ret = WEXITSTATUS(ret);
Master->finished(ret);
for (unsigned int i=0; i<Master->Public.size(); ++i)
Master->Public[i]->processTerminated(Master,ret);
}
}
bool ProcessInfo::cycleStandardOutput()
{
char Buffer[1025];
int res = read(StdOutput,Buffer,1024);
if (res < 0)
std::cout << "Read failed" << std::endl;
else if (res == 0)
{
waitForFinish();
return true;
}
else
Master->standardOutput(std::string(Buffer,res));
return false;
}
bool ProcessInfo::cycleStandardError()
{
char Buffer[1025];
int res = read(StdError,Buffer,1024);
if (res < 0)
std::cout << "Read failed" << std::endl;
else if (res == 0)
{
}
else
Master->standardError(std::string(Buffer,res));
return false;
}
std::vector<ProcessInfo> Processes;
bool launchProcess(ProcessController* theController,
const std::string& Executable, const std::vector<std::string>& Args)
{
/* std::cout << "EXEC : " << Executable;
for (unsigned int i=0; i<Args.size(); ++i)
std::cout << " {.} " << Args[i];
std::cout << std::endl; */
int tubeStandardOutput[2];
int result = pipe(tubeStandardOutput);
if (result < 0)
{
theController->failed();
std::cerr << "Failed to create pipe stdout " << errno << std::endl;
return false;
}
int tubeStandardError[2];
result = pipe(tubeStandardError);
if (result < 0)
{
close(tubeStandardOutput[0]);
close(tubeStandardOutput[1]);
theController->failed();
std::cerr << "Failed to create pipe stderr " << errno << std::endl;
return false;
}
pid_t pid = fork();
if (pid < 0)
{
close(tubeStandardOutput[0]);
close(tubeStandardOutput[1]);
close(tubeStandardError[0]);
close(tubeStandardError[1]);
theController->failed();
std::cerr << "Failed to fork" << std::endl;
return false;
}
else if (pid)
{
// parent
close(tubeStandardOutput[1]);
close(tubeStandardError[1]);
ProcessInfo PI;
PI.Master = theController;
PI.PID = pid;
PI.StdOutput = tubeStandardOutput[0];
PI.StdError = tubeStandardError[0];
Processes.push_back(PI);
return true;
}
else
{
// child
close(tubeStandardOutput[0]);
close(tubeStandardError[0]);
int res = dup2(tubeStandardOutput[1],STDOUT_FILENO);
if (res < 0)
{
std::cerr << "Failed to dup2 standard output" << std::endl;
close(tubeStandardOutput[1]);
close(tubeStandardError[1]);
exit(1);
}
res = dup2(tubeStandardError[1],STDERR_FILENO);
if (res < 0)
{
std::cerr << "Failed to dup2 standard error" << std::endl;
close(tubeStandardOutput[1]);
close(tubeStandardError[1]);
exit(1);
}
char** args = (char**)malloc(sizeof(char*)*(Args.size()+2));
args[0] = (char*)malloc(sizeof(char)*Executable.length()+1);
strcpy(args[0],Executable.c_str());
for (unsigned int i=0; i<Args.size(); ++i)
{
args[i+1] = (char*)malloc(sizeof(char)*Args[i].length()+1);
strcpy(args[i+1],Args[i].c_str());
}
args[Args.size()+1] = 0;
int err = execvp(Executable.c_str(),args);
exit(42);
};
}
unsigned int waitForProcessEvent()
{
if (!Processes.size()) return Processes.size();
int MaxId = 0;
fd_set ReadSignals;
FD_ZERO(&ReadSignals);
for (unsigned int i=0; i<Processes.size(); ++i)
{
FD_SET(Processes[i].StdOutput,&ReadSignals);
if (MaxId < Processes[i].StdOutput)
MaxId = Processes[i].StdOutput;
FD_SET(Processes[i].StdError,&ReadSignals);
if (MaxId < Processes[i].StdError)
MaxId = Processes[i].StdError;
}
timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
int res = select(MaxId+1, &ReadSignals ,NULL,NULL,&tv);
if (res < 0)
{
std::cout << "Select failed" << std::endl;
return Processes.size();
}
for (unsigned int i=Processes.size(); i; --i)
{
if (FD_ISSET(Processes[i-1].StdOutput,&ReadSignals))
{
if (Processes[i-1].cycleStandardOutput())
{
Processes.erase(Processes.begin()+(i-1));
}
}
if (FD_ISSET(Processes[i-1].StdError,&ReadSignals))
{
if (Processes[i-1].cycleStandardError())
{
Processes.erase(Processes.begin()+(i-1));
}
}
}
return Processes.size();
}
bool isShellRedirective(const std::string& S)
{
return (S=="|") || (S=="<") || (S==">");
}
bool shellLaunchProcess(ProcessController* theController,
const std::string& Executable, const std::vector<std::string>& Args)
{
unsigned int i=0;
for (i=0; i<Args.size(); ++i)
if (isShellRedirective(Args[i]))
break;
if (i==Args.size())
return launchProcess(theController, Executable, Args);
std::string ShellCommand(Executable);
for (unsigned int i=0; i<Args.size(); ++i)
{
ShellCommand += " ";
ShellCommand += Args[i];
}
std::vector<std::string> NewArgs;
NewArgs.push_back("-c");
NewArgs.push_back(ShellCommand);
return launchProcess(theController, "/bin/sh", NewArgs);
}
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