Hi, all:
The harmony Runtime.exec fails on Linux with ENOMEM.
Here is the testcase:
public class Exec {
public static void main(String[] args) throws Exception {
Runtime.getRuntime().exec("ls"); }
}
I have tried it on RedHat Enterprise 4 and Unbuntu, both get ENOMEM in
native code.
After digging into it, I found it fails in procimpl.c, line 135:
grdpid = fork ();
If the call to fork is changed to vfork, the testcase will pass but
still get exitcode = 1 which indicates that some error has happened. The
difference between fork and vfork is just whether page tables is copied to
child process or not. But I do not think it is the main cause. Besides,
vfork has become outdated since it main usage is supplied by fork with
copy-on-write function implemented in modern linux kernel. Furthermore,
vfork is also not so safe as fork. So I do not think it is the accepted way
to solve the problem.
I will try whether it can be reproduced on drlvm of linux since I am not
sure whether it is relevent to VM or classlib. If any drlvm man can tell me
the result, it can avoid my trouble to build it on linux. :)
--
Leo Li
China Software Development Lab, IBM
