Library: Foundation
Package: Processes
Header: Poco/Process.h
This class provides methods for working with processes.
Direct Base Classes: ProcessImpl
All Base Classes: ProcessImpl
Member Functions: id, kill, launch, requestTermination, times, wait
typedef ArgsImpl Args;
typedef PIDImpl PID;
static PID id();
Returns the process ID of the current process.
static void kill(
PID pid
);
Kills the process with the given pid.
static ProcessHandle launch(
const std::string & command,
const Args & args
);
Creates a new process for the given command and returns a ProcessHandle of the new process. The given arguments are passed to the command on the command line.
static ProcessHandle launch(
const std::string & command,
const Args & args,
Pipe * inPipe,
Pipe * outPipe,
Pipe * errPipe
);
Creates a new process for the given command and returns a ProcessHandle of the new process. The given arguments are passed to the command on the command line.
If inPipe, outPipe or errPipe is non-null, the corresponding standard input, standard output or standard error stream of the launched process is redirected to the Pipe. PipeInputStream or PipeOutputStream can be used to send receive data from, or send data to the process.
Note: the same Pipe can be used for both outPipe and errPipe.
After a Pipe has been passed as inPipe, only write operations are valid. After a Pipe has been passed as outPipe or errPipe, only read operations are valid.
It is forbidden to pass the same pipe as inPipe and outPipe or errPipe.
Usage example:
Pipe outPipe;
Process::Args args;
ProcessHandle ph(launch("/bin/ps", args, 0, &outPipe, 0));
PipeInputStream istr(outPipe);
... // read output of ps from istr
int rc = ph.wait();
static void requestTermination(
PID pid
);
Requests termination of the process with the give PID.
On Unix platforms, this will send a SIGINT to the process and thus work with arbitrary processes.
On other platforms, a global event flag will be set. Setting the flag will cause Util::ServerApplication::waitForTerminationRequest() to return. Therefore this will only work with applications based on Util::ServerApplication.
static void times(
long & userTime,
long & kernelTime
);
Returns the number of seconds spent by the current process in user and kernel mode.
static int wait(
const ProcessHandle & handle
);
Waits for the process specified by handle to terminate and returns the exit code of the process.