system calls problem

chiburashka has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: system calls problem by Aragorn (Curate) on May 27, 2004 at 08:11 UTC
Is "blabla.exe" a program which runs for a long time? `system` returns when the program called from it exits. If you want to fire off a program without waiting for it, you'll have to look into calling `fork` and `exec` yourself (`system` does a `fork` and `exec`, but waits for the child process to finish). Update: From the "blabla.exe" I infer that you're using a Windows system. A look at Win32::Process could also help if portability is not an issue. Arjen	[reply] [d/l] [select]
Re: system calls problem by muntfish (Chaplain) on May 27, 2004 at 08:14 UTC
In theory, no reason why that shouldn't work. You don't say what actually happens in your case. Does it hang after running blabla.exe? Does it not even run that properly? Does it exit immediately after running blabla.exe? Maybe blabla.exe is not actually exiting. Perhaps it is waiting for some input. If you could post a bit more of your code, and maybe tell us what the external program is trying to do, that would help. s^^unp(;75N=&9I<V@`ack(u,^;s\|$.+\`\|"$`$'\"$&\"$"\|ee;/m.+h/&&print$&;	[reply] [d/l]
Re: system calls problem by snadra (Scribe) on May 27, 2004 at 08:21 UTC
Try to execute the whole path. If that does not help, maybe the programm you try to call is causing the problem. system() is doing a fork, and the process is waitng for the child process to complete. If you don't need to fork (the return) try exec(), wich does not do a return: exec('C\pogramms\programm.exe', $file_to_open); snadra	[reply]
Re: Re: system calls problem by Aragorn (Curate) on May 27, 2004 at 08:39 UTC
Be aware of the fact that the reason that `exec` doesn't return is that the called program is run instead of the caller. The program image of your script (i.e. the Perl interpreter running your script in memory) is replaced with the `exec`ed program. Arjen	[reply] [d/l] [select]