File Information
Library: Foundation
Package: Processes
Header: Poco/Process.h
Description
This class provides methods for working with processes.
Inheritance
Direct Base Classes: ProcessImpl
All Base Classes: ProcessImpl
Member Summary
Member Functions: id, isRunning, kill, launch, requestTermination, times, tryWait, wait
Types
Args
typedef ArgsImpl Args;
Env
typedef EnvImpl Env;
PID
typedef PIDImpl PID;
Member Functions
id 
static PID id();
Returns the process ID of the current process.
isRunning
static bool isRunning(
const ProcessHandle & handle
);
check if the process specified by handle is running or not
This is preferable on Windows where process IDs may be reused.
isRunning
static bool isRunning(
PID pid
);
Check if the process specified by given pid is running or not.
kill
static void kill(
ProcessHandle & handle
);
Kills the process specified by handle.
This is preferable on Windows where process IDs may be reused.
kill
static void kill(
PID pid
);
Kills the process with the given pid.
launch
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.
launch
static ProcessHandle launch(
const std::string & command,
const Args & args,
const std::string & initialDirectory
);
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. The process starts executing in the specified initial directory.
launch
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();
launch
static ProcessHandle launch(
const std::string & command,
const Args & args,
const std::string & initialDirectory,
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. The process starts executing in the specified initial directory.
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();
launch
static ProcessHandle launch(
const std::string & command,
const Args & args,
Pipe * inPipe,
Pipe * outPipe,
Pipe * errPipe,
const Env & env
);
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.
The launched process is given the specified environment variables.
launch
static ProcessHandle launch(
const std::string & command,
const Args & args,
const std::string & initialDirectory,
Pipe * inPipe,
Pipe * outPipe,
Pipe * errPipe,
const Env & env
);
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. The process starts executing in the specified initial directory. 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. The launched process is given the specified environment variables.
requestTermination
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.
times
static void times(
long & userTime,
long & kernelTime
);
Returns the number of seconds spent by the current process in user and kernel mode.
tryWait
static int tryWait(
const ProcessHandle & handle
);
Checks that process is finished and returns the exit code of the process. If the process is still running, returns -1.
wait
static int wait(
const ProcessHandle & handle
);
Waits for the process specified by handle to terminate and returns the exit code of the process.