ref: 31f66da43347e73de92995b7e50f1df1c0e8131f
dir: /sys/src/9/xen/devrtc.c/
/* * Xen wall clock */ #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" enum{ Qdir = 0, Qrtc, }; Dirtab rtcdir[]={ ".", {Qdir, 0, QTDIR}, 0, 0555, "rtc", {Qrtc, 0}, 0, 0664, }; static long rtcread(Chan *c, void *a, long n, vlong offset) { if(c->qid.type & QTDIR) return devdirread(c, a, n, rtcdir, nelem(rtcdir), devgen); switch((ulong)c->qid.path){ case Qrtc: return readnum((ulong)offset, a, n, xenwallclock(), 12); } error(Ebadarg); return 0; } static long rtcwrite(Chan*c, void*, long n, vlong) { switch((ulong)c->qid.path){ case Qrtc: return n; } error(Eperm); return 0; } static Chan* rtcattach(char* spec) { return devattach('r', spec); } static Walkqid* rtcwalk(Chan* c, Chan *nc, char** name, int nname) { return devwalk(c, nc, name, nname, rtcdir, nelem(rtcdir), devgen); } static int rtcstat(Chan* c, uchar* dp, int n) { return devstat(c, dp, n, rtcdir, nelem(rtcdir), devgen); } static Chan* rtcopen(Chan* c, int omode) { return devopen(c, omode, rtcdir, nelem(rtcdir), devgen); } static void rtcclose(Chan*) { } Dev rtcdevtab = { 'r', "rtc", devreset, devinit, devshutdown, rtcattach, rtcwalk, rtcstat, rtcopen, devcreate, rtcclose, rtcread, devbread, rtcwrite, devbwrite, devremove, devwstat, };