Terminate a process and close all its opened listening ports

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-1

On my Qt application, I run an external executable on a separate process like this:

QProcess *server = new QProcess();

server->start("./server.exe");

External executable starts a server on 127.0.0.1 listening on port 18383.

Then at some point, I terminate the process like this:

server->terminate();

The problem is that by terminating the server process, many times its used port i.e. 18383 remains open. Consequently, when I try to start the server again, I receive these errors:

"Server -2 Could not setup server. listen tcp :18383: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.

How can I terminate the process and close all its opened listening ports?

asked Jan 3 at 6:54

user3405291

1,94312141

Does the terminate() call actually kill the process?

– Michael Chourdakis
Jan 3 at 7:20

@Michael Well, sometimes I receive these errors while terminating the process: QProcess: Destroyed while process (" ... server.exe ...") is still running

– user3405291
Jan 3 at 7:23

1

In that case, the process object is destroyed while the actual process is still running. You should try a graceful exit instead.

– Michael Chourdakis
Jan 3 at 7:35

@Michael Thanks! I'm going to study QProcess documentation more to see if I can use its API for a graceful exit.

– user3405291
Jan 3 at 7:39

2

Try opening your port with SO_REUSEADDR, you might just be encountering the situation where the listening port is kept open for a short while to allow for in flight tcp packets to be received

– Alan Birtles
Jan 3 at 7:40

|
show 2 more comments

-1

On my Qt application, I run an external executable on a separate process like this:

QProcess *server = new QProcess();

server->start("./server.exe");

External executable starts a server on 127.0.0.1 listening on port 18383.

Then at some point, I terminate the process like this:

server->terminate();

The problem is that by terminating the server process, many times its used port i.e. 18383 remains open. Consequently, when I try to start the server again, I receive these errors:

"Server -2 Could not setup server. listen tcp :18383: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.

How can I terminate the process and close all its opened listening ports?

asked Jan 3 at 6:54

user3405291

1,94312141

Does the terminate() call actually kill the process?

– Michael Chourdakis
Jan 3 at 7:20

@Michael Well, sometimes I receive these errors while terminating the process: QProcess: Destroyed while process (" ... server.exe ...") is still running

– user3405291
Jan 3 at 7:23

1

In that case, the process object is destroyed while the actual process is still running. You should try a graceful exit instead.

– Michael Chourdakis
Jan 3 at 7:35

@Michael Thanks! I'm going to study QProcess documentation more to see if I can use its API for a graceful exit.

– user3405291
Jan 3 at 7:39

2

Try opening your port with SO_REUSEADDR, you might just be encountering the situation where the listening port is kept open for a short while to allow for in flight tcp packets to be received

– Alan Birtles
Jan 3 at 7:40

|
show 2 more comments

-1

On my Qt application, I run an external executable on a separate process like this:

QProcess *server = new QProcess();

server->start("./server.exe");

External executable starts a server on 127.0.0.1 listening on port 18383.

Then at some point, I terminate the process like this:

server->terminate();

The problem is that by terminating the server process, many times its used port i.e. 18383 remains open. Consequently, when I try to start the server again, I receive these errors:

"Server -2 Could not setup server. listen tcp :18383: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.

How can I terminate the process and close all its opened listening ports?

asked Jan 3 at 6:54

user3405291

1,94312141

On my Qt application, I run an external executable on a separate process like this:

QProcess *server = new QProcess();

server->start("./server.exe");

External executable starts a server on 127.0.0.1 listening on port 18383.

Then at some point, I terminate the process like this:

server->terminate();

The problem is that by terminating the server process, many times its used port i.e. 18383 remains open. Consequently, when I try to start the server again, I receive these errors:

"Server -2 Could not setup server. listen tcp :18383: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.

How can I terminate the process and close all its opened listening ports?

c++ qt port

asked Jan 3 at 6:54

user3405291

1,94312141

asked Jan 3 at 6:54

user3405291

1,94312141

asked Jan 3 at 6:54

user3405291

1,94312141

asked Jan 3 at 6:54

user3405291

1,94312141

asked Jan 3 at 6:54

user3405291

1,94312141

Does the terminate() call actually kill the process?

– Michael Chourdakis
Jan 3 at 7:20

@Michael Well, sometimes I receive these errors while terminating the process: QProcess: Destroyed while process (" ... server.exe ...") is still running

– user3405291
Jan 3 at 7:23

1

In that case, the process object is destroyed while the actual process is still running. You should try a graceful exit instead.

– Michael Chourdakis
Jan 3 at 7:35

@Michael Thanks! I'm going to study QProcess documentation more to see if I can use its API for a graceful exit.

– user3405291
Jan 3 at 7:39

2

Try opening your port with SO_REUSEADDR, you might just be encountering the situation where the listening port is kept open for a short while to allow for in flight tcp packets to be received

– Alan Birtles
Jan 3 at 7:40

|
show 2 more comments

Does the terminate() call actually kill the process?

– Michael Chourdakis
Jan 3 at 7:20

@Michael Well, sometimes I receive these errors while terminating the process: QProcess: Destroyed while process (" ... server.exe ...") is still running

– user3405291
Jan 3 at 7:23

1

In that case, the process object is destroyed while the actual process is still running. You should try a graceful exit instead.

– Michael Chourdakis
Jan 3 at 7:35

@Michael Thanks! I'm going to study QProcess documentation more to see if I can use its API for a graceful exit.

– user3405291
Jan 3 at 7:39

2

Try opening your port with SO_REUSEADDR, you might just be encountering the situation where the listening port is kept open for a short while to allow for in flight tcp packets to be received

– Alan Birtles
Jan 3 at 7:40

Does the terminate() call actually kill the process?

– Michael Chourdakis
Jan 3 at 7:20

@Michael Well, sometimes I receive these errors while terminating the process: QProcess: Destroyed while process (" ... server.exe ...") is still running

– user3405291
Jan 3 at 7:23

In that case, the process object is destroyed while the actual process is still running. You should try a graceful exit instead.

– Michael Chourdakis
Jan 3 at 7:35

@Michael Thanks! I'm going to study QProcess documentation more to see if I can use its API for a graceful exit.

– user3405291
Jan 3 at 7:39

Try opening your port with SO_REUSEADDR, you might just be encountering the situation where the listening port is kept open for a short while to allow for in flight tcp packets to be received

– Alan Birtles
Jan 3 at 7:40

|
show 2 more comments

1 Answer
1

active

oldest

votes

sometimes I receive these errors while terminating the process:
QProcess: Destroyed while process (" ... server.exe ...") is still
running

It seems you are not waiting for the process to gracefully terminate.
Here is a generic way to terminate a process you launched :

server->terminate(); 

server->waitForFinished(timeoutMS);

if (server->state() == QProcess::Running) {

     server->kill();

}

Terminate will send a polite "can you please stop" signal, kill will abruptly stop the target process. How much time does it take for the server to shut down (it may be several seconds)? so you should have a generous timeout period which take this in account.

answered Jan 3 at 9:46

UmNyobe

17.9k73875

1

Thanks! The error QProcess: Destroyed while process is still running got resolved :) However, I'm not sure if I will receive the Server -2 error on tcp port again. I hope I won't!

– user3405291
Jan 3 at 10:00

if the server is not leaking network resources it should be fine.

– UmNyobe
Jan 3 at 10:14

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

sometimes I receive these errors while terminating the process:
QProcess: Destroyed while process (" ... server.exe ...") is still
running

It seems you are not waiting for the process to gracefully terminate.
Here is a generic way to terminate a process you launched :

server->terminate(); 

server->waitForFinished(timeoutMS);

if (server->state() == QProcess::Running) {

     server->kill();

}

answered Jan 3 at 9:46

UmNyobe

17.9k73875

1

Thanks! The error QProcess: Destroyed while process is still running got resolved :) However, I'm not sure if I will receive the Server -2 error on tcp port again. I hope I won't!

– user3405291
Jan 3 at 10:00

if the server is not leaking network resources it should be fine.

– UmNyobe
Jan 3 at 10:14

add a comment |

sometimes I receive these errors while terminating the process:
QProcess: Destroyed while process (" ... server.exe ...") is still
running

It seems you are not waiting for the process to gracefully terminate.
Here is a generic way to terminate a process you launched :

server->terminate(); 

server->waitForFinished(timeoutMS);

if (server->state() == QProcess::Running) {

     server->kill();

}

answered Jan 3 at 9:46

UmNyobe

17.9k73875

1

Thanks! The error QProcess: Destroyed while process is still running got resolved :) However, I'm not sure if I will receive the Server -2 error on tcp port again. I hope I won't!

– user3405291
Jan 3 at 10:00

if the server is not leaking network resources it should be fine.

– UmNyobe
Jan 3 at 10:14

add a comment |

sometimes I receive these errors while terminating the process:
QProcess: Destroyed while process (" ... server.exe ...") is still
running

It seems you are not waiting for the process to gracefully terminate.
Here is a generic way to terminate a process you launched :

server->terminate(); 

server->waitForFinished(timeoutMS);

if (server->state() == QProcess::Running) {

     server->kill();

}

answered Jan 3 at 9:46

UmNyobe

17.9k73875

sometimes I receive these errors while terminating the process:
QProcess: Destroyed while process (" ... server.exe ...") is still
running

It seems you are not waiting for the process to gracefully terminate.
Here is a generic way to terminate a process you launched :

server->terminate(); 

server->waitForFinished(timeoutMS);

if (server->state() == QProcess::Running) {

     server->kill();

}

answered Jan 3 at 9:46

UmNyobe

17.9k73875

answered Jan 3 at 9:46

UmNyobe

17.9k73875

answered Jan 3 at 9:46

UmNyobe

17.9k73875

answered Jan 3 at 9:46

UmNyobe

17.9k73875

1

Thanks! The error QProcess: Destroyed while process is still running got resolved :) However, I'm not sure if I will receive the Server -2 error on tcp port again. I hope I won't!

– user3405291
Jan 3 at 10:00

if the server is not leaking network resources it should be fine.

– UmNyobe
Jan 3 at 10:14

add a comment |

1

Thanks! The error QProcess: Destroyed while process is still running got resolved :) However, I'm not sure if I will receive the Server -2 error on tcp port again. I hope I won't!

– user3405291
Jan 3 at 10:00

if the server is not leaking network resources it should be fine.

– UmNyobe
Jan 3 at 10:14

Thanks! The error QProcess: Destroyed while process is still running got resolved :) However, I'm not sure if I will receive the Server -2 error on tcp port again. I hope I won't!

– user3405291
Jan 3 at 10:00

if the server is not leaking network resources it should be fine.

– UmNyobe
Jan 3 at 10:14

add a comment |

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