ref: 3b45a5cf6cca3579712587082cc548a8e62dccda
dir: /kern/devlfd.c/
#include "u.h" #include <errno.h> #include "lib.h" #include "dat.h" #include "fns.h" #include "error.h" #undef pread #undef pwrite Chan* lfdchan(int fd) { Chan *c; c = newchan(); c->type = devno('L', 0); c->aux = (void*)(uintptr)fd; c->name = newcname("fd"); c->mode = ORDWR; c->qid.type = 0; c->qid.path = 0; c->qid.vers = 0; c->dev = 0; c->offset = 0; return c; } int lfdfd(int fd) { return newfd(lfdchan(fd)); } static Chan* lfdattach(char *x) { USED(x); error(Egreg); return nil; } static Walkqid* lfdwalk(Chan *c, Chan *nc, char **name, int nname) { USED(c); USED(nc); USED(name); USED(nname); error(Egreg); return nil; } static int lfdstat(Chan *c, uchar *dp, int n) { USED(c); USED(dp); USED(n); error(Egreg); return -1; } static Chan* lfdopen(Chan *c, int omode) { USED(c); USED(omode); error(Egreg); return nil; } static void lfdclose(Chan *c) { close((int)(uintptr)c->aux); } static long lfdread(Chan *c, void *buf, long n, vlong off) { USED(off); /* can't pread on pipes */ n = read((int)(uintptr)c->aux, buf, n); if(n < 0){ iprint("error %d\n", errno); oserror(); } return n; } static long lfdwrite(Chan *c, void *buf, long n, vlong off) { USED(off); /* can't pread on pipes */ n = write((int)(uintptr)c->aux, buf, n); if(n < 0){ iprint("error %d\n", errno); oserror(); } return n; } Dev lfddevtab = { 'L', "lfd", devreset, devinit, devshutdown, lfdattach, lfdwalk, lfdstat, lfdopen, devcreate, lfdclose, lfdread, devbread, lfdwrite, devbwrite, devremove, devwstat, };