Re: NSTask terminates when NSApplication exits (Scott Ribe)
Ling Peng
在 2012年1月19日，4:02，cocoa-dev-requ...@lists.apple.com 写道：
> Re: NSTask terminates when NSApplication exits (Scott Ribe)
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On Jan 19, 2012, at 11:49 AM, Jens Alfke wrote:
> Huh; you learn something new every day!
Yeah, specifically I learned this about 6 months ago ;-)
> In addition to shell behavior you mention, I also see this when Xcode crashes
> and takes down the app I’m debugging. But I suppose Xcode configur
On Jan 19, 2012, at 12:49 PM, Jens Alfke wrote:
> On Jan 19, 2012, at 10:10 AM, Scott Ribe wrote:
>
>> Not true. It looks like the case at a cursory level because session
>> management does this when you're in the terminal. There are various ways to
>> arrange for a process to exit when its par
On Jan 19, 2012, at 10:10 AM, Scott Ribe wrote:
> Not true. It looks like the case at a cursory level because session
> management does this when you're in the terminal. There are various ways to
> arrange for a process to exit when its parent exits. But it is *not* the case
> that a process i
On Jan 18, 2012, at 1:38 PM, Jens Alfke wrote:
>
> Nope. In Unix, a process is killed when its parent process exits.
Not true. It looks like the case at a cursory level because session management
does this when you're in the terminal. There are various ways to arrange for a
process to exit whe
On Jan 18, 2012, at 2:27 PM, Ken Thomases wrote:
> On Jan 18, 2012, at 3:13 PM, Keary Suska wrote:
>
>> Any special handling of NSTask aside, Mac OS X uses Unix-based process
>> control which closes all child processes when the parent is closed.
>
> No, that's not true. Where did you get that
On Wed, Jan 18, 2012 at 12:38 PM, Jens Alfke wrote:
> Nope. In Unix, a process is killed when its parent process exits.
No it's not.
/tmp% cat processes.c
#include
#include
int main(int argc, char **argv)
{
printf("Parent pid is %lu\n", (unsigned long)getpid());
pid_t child = fork();
On Jan 18, 2012, at 10:59 AM, Andrew wrote:
> I am trying to write a program that maintains different installs of
> another program including launching the program. To do so, I am using
> NSTask. Now when I quit my cocoa app. the NSTask app dies. …
> According to what I have read, the applicatio
On Jan 18, 2012, at 2:27 PM, Ken Thomases wrote:
>> Note that you can't do this with Cocoa/Objective-C (at least Apple says you
>> shouldn't…)
>
> You can fork() and exec() just fine. What you can't do is fork(), _not_ call
> exec(), and then do anything other than call POSIX async-cancel-safe
Thanks, I'll have a look.
BTW, I was able to confirm it is a result of streams. My Java
processes do not quit if I pipe their output to null:
NSTask *task = [NSTask new];
[task setLaunchPath:execPath];
[task setCurrentDirectoryPath:_directory];
[task setArguments:arguments];
[task setStandard
On Jan 18, 2012, at 3:13 PM, Keary Suska wrote:
> Any special handling of NSTask aside, Mac OS X uses Unix-based process
> control which closes all child processes when the parent is closed.
No, that's not true. Where did you get that?
Processes with a controlling terminal get a SIGHUP when th
On Jan 18, 2012, at 11:59 AM, Andrew wrote:
> I am trying to write a program that maintains different installs of
> another program including launching the program. To do so, I am using
> NSTask. Now when I quit my cocoa app. the NSTask app dies. The task
> that the NSTask is running is a Java pro
On Jan 18, 2012, at 11:59 AM, Andrew wrote:
> I can probably find out the answer by trying different things, but I'd
> like to get a better insight for what is going on and why the child
> task is terminating.
You may want to try LS (Launch Services) routines.
--
Scott Ribe
scott_r...@eleva
I am trying to write a program that maintains different installs of
another program including launching the program. To do so, I am using
NSTask. Now when I quit my cocoa app. the NSTask app dies. The task
that the NSTask is running is a Java program, not sure if that makes a
difference. According
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