Does DTrace script only support "#pragma D option ..", not "-x option"?

[Nan Xiao]

Hi Matt & Mark,

Firstly, thanks very much for your responses!

I change my script as this:

#!/usr/sbin/dtrace -x dynvarsize=64m -s

dtrace:::BEGIN
{
printf("Hello FreeBSD!\n");
}

It still generates errors:

dtrace: failed to set -x  dynvarsize: Invalid option name


But dynvarsize should be a valid option name.

Thanks!

Best Regards
Nan Xiao

On Fri, Jul 21, 2017 at 12:27 PM, Matthew Ahrens <mahrens at delphix.com>
wrote:

>
>
> On Thu, Jul 20, 2017 at 8:03 PM, Nan Xiao <xiaonan830818 at gmail.com> wrote:
>
>> Hi all,
>>
>> My FreeBSD version is 11.0, and I write a simple DTrace script:
>>
>> #!/usr/sbin/dtrace -s -x dynvarsize=64m
>>
>> dtrace:::BEGIN
>> {
>>         printf("Hello FreeBSD!\n");
>> }
>>
>> Running it will generate following error:
>>
>> dtrace: failed to open  -x dynvarsize=64m: No such file or directory
>>
>>
>> So does DTrace only support using "#pragma D option dynvarsize=64m" format
>> in script? I remembered Solaris can support both formats.
>>
>
> This doesn't work on Solaris, because (at least on Solaris/illumos)
> shebang binaries only support one argument; further arguments are silently
> ignored.  So your script does execute on Solaris, but the "-x
> dynvarsize=64m" is ignored.
>
> And as Mark said, the -s needs to be last.  But (on Solaris) then it'll be
> ignored because it isn't the first argument.  You can combine multiple
> no-argument flags in the shebang line, e.g.:
>
> #!/usr/sbin/dtrace -vZs
> ...
>
> --matt
>
>
>>
>> Thanks!
>>
>> Best Regards
>> Nan Xiao
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>
>