Date: Fri, 11 Oct 1996 23:04:19 +0000 From: Gary Jennejohn <garyj@munich.netsurf.de> To: Poul-Henning Kamp <phk@critter.tfs.com> Cc: freebsd-current@freebsd.org Subject: Re: invalid return value from sysctl_kern_proc ? Message-ID: <199610112304.XAA06498@peedub.gj.org> In-Reply-To: Your message of "Fri, 11 Oct 1996 20:36:14 %2B0200." <407.845058974@critter.tfs.com>
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Poul-Henning Kamp writes:
>In message <199610111957.TAA05925@peedub.gj.org>, Gary Jennejohn writes:
[cruft deleted]
>>I ask because sysctl isn't returning an error when I try to get the proc
>>struct for a non-existent process. Seems to me that it should.
>
>Well, it does, you don't get any data back.
>
>sysctl doesn't return error for things in the data domain it handles,
>only errors about the handling.
>
thanks alot, Poul-Henning !
this means that this code from kvm_getprocs in libkvm is wrong.
if (size % sizeof(struct kinfo_proc) != 0) {
_kvm_err(kd, kd->program,
"proc size mismatch (%d total, %d chunks)",
size, sizeof(struct kinfo_proc));
return (0);
}
sysctl will set size = 0 if it can't find the requested data. This should
probably read
if (!size || size % sizeof(struct kinfo_proc) != 0) {
^^^^^^^
I used the code from libkvm, which didn't work as I expected it to.
---
Gary Jennejohn
Home - Gary.Jennejohn@munich.netsurf.de
Work - gjennejohn@frt.dec.com
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