I'm trying to prove that I've fixed a bug and I happen to know that if a certain function returns an error code, then I might have hit the code in question. How do I quickly determine whether or not I have hit such a case?

[root@pnfs-3-11 ~/dtrace]> more mms.d 
#! /usr/sbin/dtrace -Fs

:nfs:nfs4_trigger_mount:return
/args[1] != 0/
{
        printf("rc1 = %d\n", args[1]);
}

:nfs:nfs4_ephemeral_umount:return
/args[1] != 0/
{
        printf("rc1 = %d\n", args[1]);
}

[root@pnfs-3-11 ~/dtrace]> ./mms.d
dtrace: script './mms.d' matched 2 probes
CPU FUNCTION                                 
  0  <- nfs4_ephemeral_umount                 rc1 = 16

  0  <- nfs4_ephemeral_umount                 rc1 = 16

So if the function name is nfs4_trigger_mount or nfs4_ephemeral_umount, then print the return code if it is not 0. Hmm, I should probably remove the '\n's.

[root@pnfs-3-11 ~/dtrace]> ./mms.d
dtrace: script './mms.d' matched 2 probes
CPU FUNCTION                                 
  1  <- nfs4_ephemeral_umount                 rc1 = 16
  1  <- nfs4_ephemeral_umount                 rc1 = 16

I'm actually looking for an 11 (EAGAIN) coming back from nfs4_trigger_mount, but the abundance of 16 (EBUSY) from nfs4_ephemeral_umount tells me I've probably fixed another bug I was hitting.

Trying to run a test program which needs rsh, and I'm getting:

# rsh pnfs-3-11.central w
pnfs-3-11.central.sun.com: Connection refused

Evidently rshd is not running. There is plenty of info on how to get it running pre-Solaris 10. Hmm, how do I get started with smf?

# svcadm enable svc:/network/shell:default
# svcadm enable svc:/network/login:rlogin

I threw in rlogin for free!

Make sure to fill in your /etc/hosts and .rhosts files as needed.

# rsh pnfs-3-11.central w
  1:58pm  up 9 min(s),  1 user,  load average: 0.00, 0.05, 0.05
User     tty           login@  idle   JCPU   PCPU  what
root     pts/1         1:50pm     6                -sh