Date: Fri, 06 Jan 2017 21:28:49 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 215836] [PATCH] sbin/dmesg: support new flag for watching messages Message-ID: <bug-215836-8-zsP6MDxC07@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-215836-8@https.bugs.freebsd.org/bugzilla/> References: <bug-215836-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215836 Mateusz Guzik <mjg@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mjg@FreeBSD.org --- Comment #1 from Mateusz Guzik <mjg@FreeBSD.org> --- >@@ -109,6 +112,8 @@ main(int argc, char *argv[]) > if (argc !=3D 0) > usage(); >=20 >+again: >+ > if (memf =3D=3D NULL) { > /* > * Running kernel. Use sysctl. This gives an unwrapped buffer >@@ -203,15 +208,26 @@ main(int argc, char *argv[]) > } > } >=20 >+ if (*p =3D=3D '\0') continue; >+ > (void)strvisx(visbp, p, nextp - p, 0); >- (void)printf("%s", visbp); >+ if (*visbp !=3D '\n') (void)printf("%s", visbp); > } >+ >+ free (bp); >+ free (visbp); >+ >+ if (loop) { >+ usleep(100000); >+ goto again; >+ } >+ > exit(0); > } >=20 I'm afraid this approach is a non-starter. Entries in dmesg show up extreme= ly rarely and waking up periodically to check it quite wasteful, especially so with this frequency. Luckily, /dev/klog supports kqueue so you can use that to get notified. --=20 You are receiving this mail because: You are the assignee for the bug.=
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