Date: Thu, 20 Jul 2017 21:27:24 -0700 From: Matthew Ahrens <mahrens@delphix.com> To: Nan Xiao <xiaonan830818@gmail.com> Cc: freebsd-dtrace@freebsd.org Subject: Re: Does DTrace script only support "#pragma D option ..", not "-x option"? Message-ID: <CAJjvXiHbz7re_JpcQLiH4nW5VdJduFxSbYEVUfr_n=Drsv48zw@mail.gmail.com> In-Reply-To: <CA%2BMhoaORhTetd4414WjWgEbvRmTiHfbwk9FM5QCgqUbpKhBm9Q@mail.gmail.com> References: <CA%2BMhoaORhTetd4414WjWgEbvRmTiHfbwk9FM5QCgqUbpKhBm9Q@mail.gmail.com>
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On Thu, Jul 20, 2017 at 8:03 PM, Nan Xiao <xiaonan830818@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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