1991/1109/port/dev.c (diff list | history)

port/dev.c on 1990/0227
1990/0227		#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "errno.h" #define DEVTAB #include "devtab.h" #include "fcall.h" int devno(int c, int user) { char *s; s = strchr(devchar, c); if(s==0 || c==0){ if(user) return -1; panic("devno %c 0x%ux", c, c); } return s - devchar; } void
1991/1109		devdir(Chan *c, Qid qid, char *n, long length, char *user, long perm, Dir *db)
1990/0227		{ strcpy(db->name, n); db->qid = qid; db->type = devchar[c->type]; db->dev = c->dev;
1990/11211		if(qid.path & CHDIR)
1990/0227		db->mode = CHDIR|perm; else db->mode = perm; db->atime = seconds(); db->mtime = db->atime; db->hlength = 0; db->length = length;
1991/0318		memmove(db->uid, user, NAMELEN); memmove(db->gid, user, NAMELEN);
1990/0227		} int devgen(Chan *c, Dirtab *tab, int ntab, int i, Dir *dp) { if(tab==0 || i>=ntab) return -1; tab += i;
1991/1109		devdir(c, tab->qid, tab->name, tab->length, eve, tab->perm, dp);
1990/0227		return 1; } Chan * devattach(int tc, char *spec) { Chan *c; c = newchan();
1990/11211		c->qid = (Qid){CHDIR, 0};
1990/0227		c->type = devno(tc, 0); return c; } Chan * devclone(Chan *c, Chan *nc) {
1990/0329		if(c->flag & COPEN) panic("clone of open file type %c\n", devchar[c->type]);
1990/0227		if(nc == 0) nc = newchan(); nc->type = c->type;
1991/0421		nc->dev = c->dev;
1990/0227		nc->mode = c->mode; nc->qid = c->qid; nc->offset = c->offset; nc->flag = c->flag; nc->mnt = c->mnt;
1991/0427		nc->mountid = c->mountid;
1991/0421		nc->aux = c->aux;
1990/0303		nc->mchan = c->mchan; nc->mqid = c->mqid;
1990/0227		return nc; } int devwalk(Chan *c, char *name, Dirtab *tab, int ntab, Devgen *gen) { long i; Dir dir; isdir(c); if(name[0]=='.' && name[1]==0) return 1; for(i=0;; i++) switch((*gen)(c, tab, ntab, i, &dir)){ case -1:
1990/11211		strncpy(u->error, errstrtab[Enonexist], NAMELEN);
1990/0227		return 0; case 0: continue; case 1: if(strcmp(name, dir.name) == 0){ c->qid = dir.qid; return 1; } continue; }
1991/0411		}
1990/0227		void devstat(Chan *c, char *db, Dirtab *tab, int ntab, Devgen *gen) { int i; Dir dir; for(i=0;; i++) switch((*gen)(c, tab, ntab, i, &dir)){ case -1: /* * devices with interesting directories usually don't get * here, which is good because we've lost the name by now. */
1990/11211		if(c->qid.path & CHDIR){
1991/1109		devdir(c, c->qid, ".", 0L, eve, CHDIR|0700, &dir);
1990/0227		convD2M(&dir, db); return; }
1991/0626		print("devstat %c %lux\n", devchar[c->type], c->qid.path); error(Enonexist);
1990/0227		case 0: break; case 1:
1990/11211		if(eqqid(c->qid, dir.qid)){
1990/0227		convD2M(&dir, db); return; } break; } } long devdirread(Chan *c, char *d, long n, Dirtab *tab, int ntab, Devgen *gen) {
1990/0821		long k, m;
1990/0227		Dir dir; k = c->offset/DIRLEN;
1990/0821		for(m=0; m<n; k++)
1990/0227		switch((*gen)(c, tab, ntab, k, &dir)){ case -1:
1990/0821		return m;
1990/0227		case 0: c->offset += DIRLEN; break; case 1: convD2M(&dir, d);
1990/0821		m += DIRLEN;
1990/0227		d += DIRLEN; break; }
1990/0821		return m;
1990/0227		} Chan * devopen(Chan *c, int omode, Dirtab *tab, int ntab, Devgen *gen) { int i; Dir dir; static int access[] = { 0400, 0200, 0600, 0100 }; for(i=0;; i++) switch((*gen)(c, tab, ntab, i, &dir)){ case -1: /* Deal with union directories? */ goto Return; case 0: break; case 1:
1990/11211		if(eqqid(c->qid, dir.qid)){
1990/0227		if((access[omode&3] & dir.mode) == access[omode&3]) goto Return;
1990/11211		error(Eperm);
1990/0227		} break; } Return: c->offset = 0;
1990/11211		if((c->qid.path&CHDIR) && omode!=OREAD) error(Eperm);
1990/0227		c->mode = openmode(omode); c->flag |= COPEN; return c; }