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add LK_CANRECURSE in the locking of /dev/<pid>/fd/<n> and remove the curproc 

kludge. Thanks to fvdl.
This commit is contained in:
christos 2003-01-03 13:54:22 +00:00
parent 80d406d8fe
commit b5e0c9eb5b
1 changed files with 4 additions and 6 deletions
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10
sys/miscfs/procfs/procfs_vnops.c
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@ -1,4 +1,4 @@
/* $NetBSD: procfs_vnops.c,v 1.91 2003/01/03 13:21:18 christos Exp $ */
/* $NetBSD: procfs_vnops.c,v 1.92 2003/01/03 13:54:22 christos Exp $ */
/*
* Copyright (c) 1993 Jan-Simon Pendry
@ -44,7 +44,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: procfs_vnops.c,v 1.91 2003/01/03 13:21:18 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: procfs_vnops.c,v 1.92 2003/01/03 13:54:22 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -902,16 +902,14 @@ procfs_lookup(v)
p = PFIND(pfs->pfs_pid);
if (p == NULL)
return ESRCH;
/* XXX: avoid locking issue */
if (p == curproc)
return EDEADLK;
if ((fp = p->p_fd->fd_ofiles[fd]) == NULL)
return ENOENT;
switch (fp->f_type) {
case DTYPE_VNODE:
fvp = (struct vnode *)fp->f_data;
VREF(fvp);
vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY |
(p == curproc ? LK_CANRECURSE : 0));
*vpp = fvp;
error = 0;
break;