1993/0501/port/dev.c (diff list | history)

port/dev.c on 1990/0227
1990/0227		#include "u.h"
1992/0321		#include "../port/lib.h"
1990/0227		#include "mem.h" #include "dat.h" #include "fns.h"
1992/0111		#include "../port/error.h"
1990/0227		#define DEVTAB #include "devtab.h"
1991/1220		extern ulong kerndate;
1990/0227		int devno(int c, int user) {
1992/1217		Rune *s; int i;
1990/0227
1992/1217		s = devchar; i = 0; while(*s){ if(c == *s) return i; i++; s++;
1990/0227		}
1992/1217		if(user) return -1; panic("devno %C 0x%ux", c, c); return 0;
1990/0227		} 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;
1993/0323		if(c->flag&CMSG) db->mode |= CHMOUNT;
1990/0227		db->atime = seconds();
1991/1220		db->mtime = kerndate;
1990/0227		db->hlength = 0; db->length = length;
1991/1112		strncpy(db->uid, user, NAMELEN); strncpy(db->gid, eve, 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;
1993/0501		char buf[NAMELEN+4];
1990/0227
1992/0711		USED(spec);
1990/0227		c = newchan();
1990/11211		c->qid = (Qid){CHDIR, 0};
1990/0227		c->type = devno(tc, 0);
1993/0501		if(tc != 'M') { sprint(buf, "#%C%s", tc, spec); c->path = ptenter(&syspt, 0, buf); }
1990/0227		return c; } Chan * devclone(Chan *c, Chan *nc) {
1990/0329		if(c->flag & COPEN)
1992/1217		panic("clone of open file type %C\n", devchar[c->type]);
1993/0501
1990/0227		if(nc == 0) nc = newchan();
1993/0501
1990/0227		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;
1993/0501		nc->path = c->path; incref(nc->path);
1990/0227		return nc; } int devwalk(Chan *c, char *name, Dirtab *tab, int ntab, Devgen *gen) { long i; Dir dir;
1993/0501		Path *op;
1990/0227		isdir(c); if(name[0]=='.' && name[1]==0) return 1;
1993/0501		for(i=0;; i++) {
1990/0227		switch((*gen)(c, tab, ntab, i, &dir)){ case -1:
1993/0501		strncpy(up->error, Enonexist, NAMELEN);
1990/0227		return 0; case 0: continue; case 1: if(strcmp(name, dir.name) == 0){ c->qid = dir.qid;
1993/0501		op = c->path; c->path = ptenter(&syspt, op, name); decref(op);
1990/0227		return 1; } continue; }
1993/0501		} return 0; /* not reached */
1991/0411		}
1990/0227		void devstat(Chan *c, char *db, Dirtab *tab, int ntab, Devgen *gen) { int i; Dir dir;
1993/0330		for(i=0;; i++)
1990/0227		switch((*gen)(c, tab, ntab, i, &dir)){ case -1:
1993/0501		/* * given a channel, we cannot derive the directory name * that the channel was generated from since it was lost * by namec. */
1990/11211		if(c->qid.path & CHDIR){
1993/0501		devdir(c, c->qid, c->path->elem, i*DIRLEN, eve, CHDIR|0700, &dir);
1990/0227		convD2M(&dir, db); return; }
1993/0501		print("%s %s: devstat %C %lux\n", up->text, up->user, devchar[c->type], c->qid.path);
1991/0626		error(Enonexist);
1993/0330		case 0: break;
1990/0227		case 1:
1993/0501		if(eqqid(c->qid, dir.qid)) {
1993/0323		if(c->flag&CMSG) dir.mode |= CHMOUNT;
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;
1993/0501		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; }
1993/0501		}
1990/0821		return m;
1990/0227		} Chan * devopen(Chan *c, int omode, Dirtab *tab, int ntab, Devgen *gen) { int i; Dir dir;
1991/1112		ulong t, mode;
1990/0227		static int access[] = { 0400, 0200, 0600, 0100 };
1993/0501		for(i=0;; i++) {
1990/0227		switch((*gen)(c, tab, ntab, i, &dir)){ case -1: goto Return; case 0: break; case 1:
1991/1112		if(eqqid(c->qid, dir.qid)) {
1993/0501		if(strcmp(up->user, dir.uid) == 0)
1991/1112		mode = dir.mode;
1993/0501		else if(strcmp(up->user, eve) == 0)
1991/1112		mode = dir.mode<<3; else
1993/0501		mode = dir.mode<<6;
1991/1112		t = access[omode&3]; if((t & mode) == t)
1990/0227		goto Return;
1990/11211		error(Eperm);
1990/0227		} break; }
1993/0501		} Return:
1990/0227		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; }