about execl function

[manojg]

Hi,

First time I am trying to use execl() function to execute a perl script in my c++ code. As a test I used something like this:

int main()
{
        execl("/home/user/abc/test.pl", "/home/user/abc/test.pl", temp, NULL);
        std::cout << "ok" << std::endl;
        return 0;
}

Here, perl script display the content of the home directory, temp is just a dummy argument which I use in my actual code. execl function execute the perl script fine but the problem is the c++ code terminates after "execl()" function, i.e. it does not execute the second line "std::cout << "ok" << std::endl". No error is displayed.

Any idea how to fix this will be appreciated.
Thanks.

[treuss]

Have you read the man page of execl?

First sentence:

The exec family of functions replaces the current process image with a new process image.

Your c++ program is not executing any more. It got replaced by perl.

[manojg]

Ok, Thanks a lot.
Is there any way to execute perl script within c++ code without replacing it? I tries system() but I have to give numerical argument to the perl script.

Thanks again.

[treuss]

Ok, Thanks a lot.
Is there any way to execute perl script within c++ code without replacing it? I tries system() but I have to give numerical argument to the perl script.

Thanks again.

Any program that is called from the command line accepts an array of strings (char*) as argument. So the easiest way for your is to use system.

The alternative way is to first fork(), then have the child process execute execl and the parent process wait for the child (waitpid). Check for an example usage of fork if you want to walk this path.