kvm_open: kvm_nlist: No such file or directory
- From: Luke Dean <LukeD@xxxxxxxxx>
- Date: Sun, 20 Apr 2008 10:38:32 -0700 (PDT)
A few weeks ago I did a source upgrade from 6.2 to 7-STABLE. I didn't "make delete-old" so a bunch of old libraries and such were left lying around causing problems when I rebuilt all my ports. I'd read about some recent improvements to DDB and SCHED_ULE in 7-STABLE, and it's a miserable snowy weekend in Seattle right now, so I decided I'd take this opportunity to update my system to the latest 7-STABLE and get rid of those old libraries properly this time.
Now sysutils/wmmemmon and sysutils/wmcpuload stopped working.
Both die with:
kvm_open: kvm_nlist: No such file or directory
error extracting symbols
I found two PRs for other ports (ascpu and wmcube-gdk) to fix similar problems, but they seem to be related to 8-CURRENT. The solution in both of these cases is to use sysctls instead of using kvm.
PR numbers are 119923 and 120142.
My question is should the existing code work in 7-STABLE or do wmmemmon and wmcpuload need to be changed to use sysctls?
They worked for me for a couple of weeks on 7-STABLE, but like I said, I had old libraries lying around and some of the windowmaker stuff chose to link to them.
I have since cleaned up my system and rebuilt (I believe) everything and now the ports no longer work.
This is what I believe is the offending code snippet from sysutils/wmmemmon's mem_freebsd.c file:
--------------------------------------------------------------
static kvm_t *kvm_data = NULL;
static int pageshift;
static struct nlist nlst[] = { {"_cp_time"}, {"_cnt"}, {0} };
/* initialize function */
void mem_init(void)
{
int pagesize = getpagesize();
pageshift = 0;
while (pagesize > 1) {
pageshift++;
pagesize >>= 1;
}
kvm_data = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open");
if (kvm_data == NULL) {
fprintf(stderr, "can't open kernel virtual memory");
exit(1);
}
kvm_nlist(kvm_data, nlst);
if (nlst[0].n_type == 0 || nlst[1].n_type == 0) {
fprintf(stderr, "error extracting symbols");
exit(1);
}
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