[Review] Remove procfs dependency of truss

Howard Su howard0su at gmail.com
Fri Apr 6 14:56:39 UTC 2007

On 4/6/07, Alfred Perlstein <alfred at freebsd.org> wrote:
> nit: you have new functions like this "void fun(args)", they should
> be in the form of "void\nfun(args)" (newline after return type)
I will do a style cleanup.
> possible issue: is get_string equivelant to the procfs version?
> meaning, if there's a string that ends at a strange place in the
> address space will it work any differently?
I uses a different way. I preallocate a buf to use ptrace to fill it
once. I limit the size to 1024 as a magic number. if the actual string
length is smaller than 1024 and has a NUL teminate character, we will
ignore the left chars. (little performance issue). if the actual
length is larger than 1024, i place a NUL at 1024. so it will be also

I think this is not a perfect solution. I willing to change it to
respect -s <strsize> args.
     -s strsize
	     Display strings using at most strsize characters.	If the buffer
	     is larger, "..." will be displayed at the end of the string.  The
	     default strsize is 32.

> note how the procfs version does a fgetc(3) over and over and
> stops reading if it hits \0, while the version you have tried
> to read the entire buf.  Can that cause issues?



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