Re: system() requires double ctrl-c

For people that do error checking, it's not a problem.

die if system("some_long_running_shell_command");
[download]

Update: I had the condition negated, as pointed out in replies. Fixed.

Comment on Re: system() requires double ctrl-c Download Code

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Re^2: system() requires double ctrl-c by JavaFan (Canon) on Nov 10, 2008 at 11:24 UTC
That may not always work; it depends what the return value of some_long_running_shell_command is when it receives a SIGINT. And it also depends what it returns when no SIGINT is given. "find" for instance returns (shell) FALSE on SIGINT, but also FALSE when it cannot process all files (for instance when the process doesn't have permission to decent into a directory). And (at least the 'find' found on my computer) it doesn't specify the actual exit values; just 0 and non-0. So, checking return values may work, but be aware, it will depend on the actual command run whether it will.	[reply]
Re^2: system() requires double ctrl-c by saintmike (Vicar) on Nov 10, 2008 at 08:40 UTC
For people that do error checking, it's not a problem. die if !system("some_long_running_shell_command"); You mean `die if system(...)` as system returns 0 on success ... ok, this works for simple scripts, but in the general case you might want the script to handle the error instead of dying.	[reply]
Re^3: system() requires double ctrl-c by ikegami (Patriarch) on Nov 10, 2008 at 09:17 UTC
Oops! So used to "if!" or "or" to catch errors. Fixed. As for the simplicity, it was just an example. You're right that it's really not suitable for use. The docs for `system` provide a more complete example.	[reply] [d/l]
Re^2: system() requires double ctrl-c by jwkrahn (Abbot) on Nov 10, 2008 at 08:44 UTC
system returns TRUE on error so you are dieing if `system("some_long_running_shell_command")` executed successfully.	[reply] [d/l]


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