diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-09-28 02:42:33 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-09-28 02:42:33 +0200 |
| commit | eb6a4fc1a4a6e32cd35e76771fe8687b64e9122f (patch) | |
| tree | 1f46c32b0f0c0fd22777a62ee9dd7913717a2b37 | |
| parent | c8cf0cee47914699e3e7c10a7b7501af94b53b4e (diff) | |
devcons: avoid division by zero reading Qsysstat
alexchandel got the kernel to crash with divide error
on qemu 2.1.2/macosx at this location. probably
caused by perfticks()/tsc being wrong or accounttime()
not having been called yet from timer interrupt yet for
some reason.
| -rw-r--r-- | sys/src/9/port/devcons.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/sys/src/9/port/devcons.c b/sys/src/9/port/devcons.c index 339845a1d..0db1a0e9a 100644 --- a/sys/src/9/port/devcons.c +++ b/sys/src/9/port/devcons.c @@ -581,13 +581,14 @@ consread(Chan *c, void *buf, long n, vlong off) bp += NUMSIZE; readnum(0, bp, NUMSIZE, mp->load, NUMSIZE); bp += NUMSIZE; + l = mp->perf.period; + if(l == 0) + l = 1; readnum(0, bp, NUMSIZE, - (mp->perf.avg_inidle*100)/mp->perf.period, - NUMSIZE); + (mp->perf.avg_inidle*100)/l, NUMSIZE); bp += NUMSIZE; readnum(0, bp, NUMSIZE, - (mp->perf.avg_inintr*100)/mp->perf.period, - NUMSIZE); + (mp->perf.avg_inintr*100)/l, NUMSIZE); bp += NUMSIZE; *bp++ = '\n'; } |