ref: 4d702dcec6014d5c7c9769642954697d91d9afb9
parent: 7daaecd5f60a4308c026a654a3cf18c48d708aa2
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Fri Dec 16 14:12:49 EST 2016
get rid of unused kern/syscall.c
--- a/kern/syscall.c
+++ /dev/null
@@ -1,837 +1,0 @@
-#include "u.h"
-#include "lib.h"
-#include "dat.h"
-#include "fns.h"
-#include "error.h"
-
-Chan*
-fdtochan(int fd, int mode, int chkmnt, int iref)
-{- Fgrp *f;
- Chan *c;
-
- c = 0;
- f = up->fgrp;
-
- lock(&f->ref.lk);
- if(fd<0 || NFD<=fd || (c = f->fd[fd])==0) {- unlock(&f->ref.lk);
- error(Ebadfd);
- }
- if(iref)
- refinc(&c->ref);
- unlock(&f->ref.lk);
-
- if(chkmnt && (c->flag&CMSG))
- goto bad;
- if(mode<0 || c->mode==ORDWR)
- return c;
- if((mode&OTRUNC) && c->mode==OREAD)
- goto bad;
- if((mode&~OTRUNC) != c->mode)
- goto bad;
- return c;
-bad:
- if(iref)
- cclose(c);
- error(Ebadusefd);
- return nil; /* shut up compiler */
-}
-
-static void
-fdclose(int fd, int flag)
-{- int i;
- Chan *c;
- Fgrp *f;
-
- f = up->fgrp;
-
- lock(&f->ref.lk);
- c = f->fd[fd];
- if(c == 0) {- unlock(&f->ref.lk);
- return;
- }
- if(flag) {- if(c==0 || !(c->flag&flag)) {- unlock(&f->ref.lk);
- return;
- }
- }
- f->fd[fd] = 0;
- if(fd == f->maxfd)
- for(i=fd; --i>=0 && f->fd[i]==0; )
- f->maxfd = i;
-
- unlock(&f->ref.lk);
- cclose(c);
-}
-
-static int
-newfd(Chan *c)
-{- int i;
- Fgrp *f;
-
- f = up->fgrp;
- lock(&f->ref.lk);
- for(i=0; i<NFD; i++)
- if(f->fd[i] == 0){- if(i > f->maxfd)
- f->maxfd = i;
- f->fd[i] = c;
- unlock(&f->ref.lk);
- return i;
- }
- unlock(&f->ref.lk);
- error("no file descriptors");- return 0;
-}
-
-int
-sysclose(int fd)
-{- if(waserror())
- return -1;
-
- fdtochan(fd, -1, 0, 0);
- fdclose(fd, 0);
- poperror();
- return 0;
-}
-
-int
-syscreate(char *path, int mode, ulong perm)
-{- int fd;
- Chan *c = 0;
-
- if(waserror()) {- cclose(c);
- return -1;
- }
-
- openmode(mode); /* error check only */
- c = namec(path, Acreate, mode, perm);
- fd = newfd((Chan*)c);
- poperror();
- return fd;
-}
-
-int
-sysdup(int old, int new)
-{- Chan *oc;
- Fgrp *f = up->fgrp;
- Chan *c = 0;
-
- if(waserror())
- return -1;
-
- c = fdtochan(old, -1, 0, 1);
- if(new != -1) {- if(new < 0 || NFD <= new) {- cclose(c);
- error(Ebadfd);
- }
- lock(&f->ref.lk);
- if(new > f->maxfd)
- f->maxfd = new;
- oc = f->fd[new];
- f->fd[new] = (Chan*)c;
- unlock(&f->ref.lk);
- if(oc != 0)
- cclose(oc);
- }
- else {- if(waserror()) {- cclose(c);
- nexterror();
- }
- new = newfd((Chan*)c);
- poperror();
- }
- poperror();
- return new;
-}
-
-int
-sysfstat(int fd, char *buf)
-{- Chan *c = 0;
-
- if(waserror()) {- cclose(c);
- return -1;
- }
- c = fdtochan(fd, -1, 0, 1);
- devtab[c->type]->stat((Chan*)c, buf);
- poperror();
- cclose(c);
- return 0;
-}
-
-int
-sysfwstat(int fd, char *buf)
-{- Chan *c = 0;
-
- if(waserror()) {- cclose(c);
- return -1;
- }
- nameok(buf);
- c = fdtochan(fd, -1, 1, 1);
- devtab[c->type]->wstat((Chan*)c, buf);
- poperror();
- cclose(c);
- return 0;
-}
-
-int
-syschdir(char *dir)
-{- return 0;
-}
-
-long
-bindmount(Chan *c0, char *old, int flag, char *spec)
-{- int ret;
- Chan *c1 = 0;
-
- if(flag>MMASK || (flag&MORDER) == (MBEFORE|MAFTER))
- error(Ebadarg);
-
- c1 = namec(old, Amount, 0, 0);
- if(waserror()){- cclose(c1);
- nexterror();
- }
-
- ret = cmount(c0, c1, flag, spec);
-
- poperror();
- cclose(c1);
- return ret;
-}
-
-int
-sysbind(char *new, char *old, int flags)
-{- long r;
- Chan *c0 = 0;
-
- if(waserror()) {- cclose(c0);
- return -1;
- }
- c0 = namec(new, Aaccess, 0, 0);
- r = bindmount(c0, old, flags, "");
- poperror();
- cclose(c0);
- return 0;
-}
-
-int
-sysmount(int fd, char *old, int flags, char *spec)
-{- long r;
- Chan *c0 = 0, *bc = 0;
- struct {- Chan* chan;
- char* spec;
- int flags;
- } mntparam;
-
- if(waserror()) {- cclose(bc);
- cclose(c0);
- return -1;
- }
- bc = fdtochan(fd, ORDWR, 0, 1);
- mntparam.chan = (Chan*)bc;
- mntparam.spec = spec;
- mntparam.flags = flags;
- c0 = (*devtab[devno('M', 0)].attach)(&mntparam);- cclose(bc);
- r = bindmount(c0, old, flags, spec);
- poperror();
- cclose(c0);
-
- return r;
-}
-
-int
-sysunmount(char *old, char *new)
-{- Chan *cmount = 0, *cmounted = 0;
-
- if(waserror()) {- cclose(cmount);
- cclose(cmounted);
- return -1;
- }
-
- cmount = namec(new, Amount, OREAD, 0);
- if(old != 0)
- cmounted = namec(old, Aopen, OREAD, 0);
-
- cunmount(cmount, cmounted);
- poperror();
- cclose(cmount);
- cclose(cmounted);
- return 0;
-}
-
-int
-sysopen(char *path, int mode)
-{- int fd;
- Chan *c = 0;
-
- if(waserror()){- cclose(c);
- return -1;
- }
- openmode(mode); /* error check only */
- c = namec(path, Aopen, mode, 0);
- fd = newfd((Chan*)c);
- poperror();
- return fd;
-}
-
-long
-unionread(Chan *c, void *va, long n)
-{- long nr;
- Chan *nc = 0;
- Pgrp *pg = 0;
-
- pg = up->pgrp;
- rlock(&pg->ns);
-
- for(;;) {- if(waserror()) {- runlock(&pg->ns);
- nexterror();
- }
- nc = clone(c->mnt->to, 0);
- poperror();
-
- if(c->mountid != c->mnt->mountid) {- runlock(&pg->ns);
- cclose(nc);
- return 0;
- }
-
- /* Error causes component of union to be skipped */
- if(waserror()) { - cclose(nc);
- goto next;
- }
-
- nc = (*devtab[nc->type].open)((Chan*)nc, OREAD);
- nc->offset = c->offset;
- nr = (*devtab[nc->type].read)((Chan*)nc, va, n, nc->offset);
- /* devdirread e.g. changes it */
- c->offset = nc->offset;
- poperror();
-
- cclose(nc);
- if(nr > 0) {- runlock(&pg->ns);
- return nr;
- }
- /* Advance to next element */
- next:
- c->mnt = c->mnt->next;
- if(c->mnt == 0)
- break;
- c->mountid = c->mnt->mountid;
- c->offset = 0;
- }
- runlock(&pg->ns);
- return 0;
-}
-
-long
-sysread(int fd, void *va, long n)
-{- int dir;
- Lock *cl;
- Chan *c = 0;
-
- if(waserror()) {- cclose(c);
- return -1;
- }
- c = fdtochan(fd, OREAD, 1, 1);
-
- dir = c->qid.path&CHDIR;
- if(dir) {- n -= n%DIRLEN;
- if(c->offset%DIRLEN || n==0)
- error(Etoosmall);
- }
-
- if(dir && c->mnt)
- n = unionread((Chan*)c, va, n);
- else
- n = (*devtab[c->type].read)((Chan*)c, va, n, c->offset);
-
- cl = (Lock*)&c->r.l;
- lock(cl);
- c->offset += n;
- unlock(cl);
-
- poperror();
- cclose(c);
-
- return n;
-}
-
-int
-sysremove(char *path)
-{- Chan *c = 0;
-
- if(waserror()) {- if(c != 0)
- c->type = 0; /* see below */
- cclose(c);
- return -1;
- }
- c = namec(path, Aaccess, 0, 0);
- (*devtab[c->type].remove)((Chan*)c);
- /*
- * Remove clunks the fid, but we need to recover the Chan
- * so fake it up. rootclose() is known to be a nop.
- */
- c->type = 0;
- poperror();
- cclose(c);
- return 0;
-}
-
-long
-sysseek(int fd, long off, int whence)
-{- Dir dir;
- Chan *c;
- char buf[DIRLEN];
-
- if(waserror())
- return -1;
-
- c = fdtochan(fd, -1, 1, 0);
- if(c->qid.path & CHDIR)
- error(Eisdir);
-
- switch(whence) {- case 0:
- c->offset = off;
- break;
-
- case 1:
- lock(&c->r.l); /* lock for read/write update */
- c->offset += off;
- off = c->offset;
- unlock(&c->r.l);
- break;
-
- case 2:
- (*devtab[c->type].stat)(c, buf);
- convM2D(buf, &dir);
- c->offset = dir.length + off;
- off = c->offset;
- break;
- }
- poperror();
- return off;
-}
-
-int
-sysstat(char *path, char *buf)
-{- Chan *c = 0;
-
- if(waserror()){- cclose(c);
- return -1;
- }
- c = namec(path, Aaccess, 0, 0);
- (*devtab[c->type].stat)((Chan*)c, buf);
- poperror();
- cclose(c);
- return 0;
-}
-
-long
-syswrite(int fd, void *va, long n)
-{- Lock *cl;
- Chan *c = 0;
-
- if(waserror()) {- cclose(c);
- return -1;
- }
- c = fdtochan(fd, OWRITE, 1, 1);
- if(c->qid.path & CHDIR)
- error(Eisdir);
-
- n = (*devtab[c->type].write)((Chan*)c, va, n, c->offset);
-
- cl = (Lock*)&c->r.l;
- lock(cl);
- c->offset += n;
- unlock(cl);
-
- poperror();
- cclose(c);
-
- return n;
-}
-
-int
-syswstat(char *path, char *buf)
-{- Chan *c = 0;
-
- if(waserror()) {- cclose(c);
- return -1;
- }
-
- nameok(buf);
- c = namec(path, Aaccess, 0, 0);
- (*devtab[c->type].wstat)((Chan*)c, buf);
- poperror();
- cclose(c);
- return 0;
-}
-
-int
-sysdirstat(char *name, Dir *dir)
-{- char buf[DIRLEN];
-
- if(sysstat(name, buf) == -1)
- return -1;
- convM2D(buf, dir);
- return 0;
-}
-
-int
-sysdirfstat(int fd, Dir *dir)
-{- char buf[DIRLEN];
-
- if(sysfstat(fd, buf) == -1)
- return -1;
-
- convM2D(buf, dir);
- return 0;
-}
-
-int
-sysdirwstat(char *name, Dir *dir)
-{- char buf[DIRLEN];
-
- convD2M(dir, buf);
- return syswstat(name, buf);
-}
-
-int
-sysdirfwstat(int fd, Dir *dir)
-{- char buf[DIRLEN];
-
- convD2M(dir, buf);
- return sysfwstat(fd, buf);
-}
-
-long
-sysdirread(int fd, Dir *dbuf, long count)
-{- int c, n, i, r;
- char buf[DIRLEN*50];
-
- n = 0;
- count = (count/sizeof(Dir)) * DIRLEN;
- while(n < count) {- c = count - n;
- if(c > sizeof(buf))
- c = sizeof(buf);
- r = sysread(fd, buf, c);
- if(r == 0)
- break;
- if(r < 0 || r % DIRLEN)
- return -1;
- for(i=0; i<r; i+=DIRLEN) {- convM2D(buf+i, dbuf);
- dbuf++;
- }
- n += r;
- if(r != c)
- break;
- }
-
- return (n/DIRLEN) * sizeof(Dir);
-}
-
-static int
-call(char *clone, char *dest, int *cfdp, char *dir, char *local)
-{- int fd, cfd, n;
- char *p, name[3*NAMELEN+5], data[3*NAMELEN+10];
-
- cfd = sysopen(clone, ORDWR);
- if(cfd < 0){- werrstr("%s: %r", clone);- return -1;
- }
-
- /* get directory name */
- n = sysread(cfd, name, sizeof(name)-1);
- if(n < 0) {- sysclose(cfd);
- return -1;
- }
- name[n] = 0;
- sprint(name, "%d", strtoul(name, 0, 0));
- p = strrchr(clone, '/');
- *p = 0;
- if(dir)
- snprint(dir, 2*NAMELEN, "%s/%s", clone, name);
- snprint(data, sizeof(data), "%s/%s/data", clone, name);
-
- /* connect */
- /* set local side (port number, for example) if we need to */
- if(local)
- snprint(name, sizeof(name), "connect %s %s", dest, local);
- else
- snprint(name, sizeof(name), "connect %s", dest);
- if(syswrite(cfd, name, strlen(name)) < 0){- werrstr("%s failed: %r", name);- sysclose(cfd);
- return -1;
- }
-
- /* open data connection */
- fd = sysopen(data, ORDWR);
- if(fd < 0){- werrstr("can't open %s: %r", data);- sysclose(cfd);
- return -1;
- }
- if(cfdp)
- *cfdp = cfd;
- else
- sysclose(cfd);
- return fd;
-}
-
-int
-sysdial(char *dest, char *local, char *dir, int *cfdp)
-{- int n, fd, rv;
- char *p, net[128], clone[NAMELEN+12];
-
- /* go for a standard form net!... */
- p = strchr(dest, '!');
- if(p == 0){- snprint(net, sizeof(net), "net!%s", dest);
- } else {- strncpy(net, dest, sizeof(net)-1);
- net[sizeof(net)-1] = 0;
- }
-
- /* call the connection server */
- fd = sysopen("/net/cs", ORDWR);- if(fd < 0){- /* no connection server, don't translate */
- p = strchr(net, '!');
- *p++ = 0;
- snprint(clone, sizeof(clone), "/net/%s/clone", net);
- return call(clone, p, cfdp, dir, local);
- }
-
- /*
- * send dest to connection to translate
- */
- if(syswrite(fd, net, strlen(net)) < 0){- werrstr("%s: %r", net);- sysclose(fd);
- return -1;
- }
-
- /*
- * loop through each address from the connection server till
- * we get one that works.
- */
- rv = -1;
- sysseek(fd, 0, 0);
- while((n = sysread(fd, net, sizeof(net) - 1)) > 0){- net[n] = 0;
- p = strchr(net, ' ');
- if(p == 0)
- continue;
- *p++ = 0;
- rv = call(net, p, cfdp, dir, local);
- if(rv >= 0)
- break;
- }
- sysclose(fd);
- return rv;
-}
-
-static int
-identtrans(char *addr, char *naddr, int na, char *file, int nf)
-{- char *p;
- char reply[4*NAMELEN];
-
- /* parse the network */
- strncpy(reply, addr, sizeof(reply));
- reply[sizeof(reply)-1] = 0;
- p = strchr(reply, '!');
- if(p)
- *p++ = 0;
-
- sprint(file, "/net/%.*s/clone", na - sizeof("/net//clone"), reply);- strncpy(naddr, p, na);
- naddr[na-1] = 0;
- return 1;
-}
-
-static int
-nettrans(char *addr, char *naddr, int na, char *file, int nf)
-{- long n;
- int fd;
- char *cp;
- char reply[4*NAMELEN];
-
- /*
- * ask the connection server
- */
- fd = sysopen("/net/cs", ORDWR);- if(fd < 0)
- return identtrans(addr, naddr, na, file, nf);
- if(syswrite(fd, addr, strlen(addr)) < 0){- sysclose(fd);
- return -1;
- }
- sysseek(fd, 0, 0);
- n = sysread(fd, reply, sizeof(reply)-1);
- sysclose(fd);
- if(n <= 0)
- return -1;
- reply[n] = '\0';
-
- /*
- * parse the reply
- */
- cp = strchr(reply, ' ');
- if(cp == 0)
- return -1;
- *cp++ = 0;
- strncpy(naddr, cp, na);
- naddr[na-1] = 0;
- strncpy(file, reply, nf);
- file[nf-1] = 0;
- return 0;
-}
-
-int
-sysannounce(char *addr, char *dir)
-{- char *cp;
- int ctl, n, m;
- char buf[3*NAMELEN];
- char buf2[3*NAMELEN];
- char netdir[2*NAMELEN];
- char naddr[3*NAMELEN];
-
- /*
- * translate the address
- */
- if(nettrans(addr, naddr, sizeof(naddr), netdir, sizeof(netdir)) < 0){- werrstr("can't translate address");- return -1;
- }
-
- /*
- * get a control channel
- */
- ctl = sysopen(netdir, ORDWR);
- if(ctl<0){- werrstr("can't open control channel");- return -1;
- }
- cp = strrchr(netdir, '/');
- *cp = 0;
-
- /*
- * find out which line we have
- */
- n = sprint(buf, "%.*s/", 2*NAMELEN+1, netdir);
- m = sysread(ctl, &buf[n], sizeof(buf)-n-1);
- if(m <= 0) {- sysclose(ctl);
- werrstr("can't read control file");- return -1;
- }
- buf[n+m] = 0;
-
- /*
- * make the call
- */
- n = sprint(buf2, "announce %.*s", 2*NAMELEN, naddr);
- if(syswrite(ctl, buf2, n) != n) {- sysclose(ctl);
- werrstr("announcement fails");- return -1;
- }
-
- strcpy(dir, buf);
-
- return ctl;
-}
-
-int
-syslisten(char *dir, char *newdir)
-{- char *cp;
- int ctl, n, m;
- char buf[3*NAMELEN];
-
- /*
- * open listen, wait for a call
- */
- sprint(buf, "%.*s/listen", 2*NAMELEN+1, dir);
- ctl = sysopen(buf, ORDWR);
- if(ctl < 0)
- return -1;
-
- /*
- * find out which line we have
- */
- strcpy(buf, dir);
- cp = strrchr(buf, '/');
- *++cp = 0;
- n = cp-buf;
- m = sysread(ctl, cp, sizeof(buf) - n - 1);
- if(n<=0){- sysclose(ctl);
- return -1;
- }
- buf[n+m] = 0;
-
- strcpy(newdir, buf);
- return ctl;
-}