how to correctly wait for execve to finish?

Question

A C source code (compiled and running Linux Centos 6.3) has the line:

execve(cmd, argv, envp);

execve does not return, but I w

Answer 1

Following Rici's excellent comments and answer, I found the root cause of the problem.

The original code exits with whatever cmd exited. I changed that to exit with 0 always. That is why the code behaves differently.

The following fix does not exhibit the error:

int status;

if (child = fork()) {
        waitpid(child, &status, 0);
        /*now we know execve is finished*/
        if (WIFEXITED(status))
            exit(WEXITSTATUS(status));
        exit(1);
    }

execve(cmd, argv, envp);