add fdshare() and fdinit() calls for dealing with filedesc structures

2 files changed, 46 insertions, 0 deletions

diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
index edc7b618b9f..2aac60d9e02 100644
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -606,6 +606,50 @@ ffree(fp)
 }
 
 /*
+ * Build a new filedesc structure.
+ */
+struct filedesc *
+fdinit(p)
+	struct proc *p;
+{
+	register struct filedesc0 *newfdp;
+	register struct filedesc *fdp = p->p_fd;
+	extern int cmask;
+
+	MALLOC(newfdp, struct filedesc0 *, sizeof(struct filedesc0),
+	    M_FILEDESC, M_WAITOK);
+	bzero(newfdp, sizeof(struct filedesc0));
+	newfdp->fd_fd.fd_cdir = fdp->fd_cdir;
+	VREF(newfdp->fd_fd.fd_cdir);
+	newfdp->fd_fd.fd_rdir = fdp->fd_rdir;
+	if (newfdp->fd_fd.fd_rdir)
+		VREF(newfdp->fd_fd.fd_rdir);
+
+	/* Create the file descriptor table. */
+	newfdp->fd_fd.fd_refcnt = 1;
+	newfdp->fd_fd.fd_cmask = cmask;
+	newfdp->fd_fd.fd_ofiles = newfdp->fd_dfiles;
+	newfdp->fd_fd.fd_ofileflags = newfdp->fd_dfileflags;
+	newfdp->fd_fd.fd_nfiles = NDFILE;
+
+	newfdp->fd_fd.fd_freefile = 0;
+	newfdp->fd_fd.fd_lastfile = 0;
+
+	return (&newfdp->fd_fd);
+}
+
+/*
+ * Share a filedesc structure.
+ */
+struct filedesc *
+fdshare(p)
+	struct proc *p;
+{
+	p->p_fd->fd_refcnt++;
+	return (p->p_fd);
+}
+
+/*
  * Copy a filedesc structure.
  */
 struct filedesc *
diff --git a/sys/sys/filedesc.h b/sys/sys/filedesc.h
index e37c7a3e8fe..445d78d8e78 100644
--- a/sys/sys/filedesc.h
+++ b/sys/sys/filedesc.h
@@ -98,6 +98,8 @@ int	dupfdopen __P((struct filedesc *fdp, int indx, int dfd, int mode,
 int	fdalloc __P((struct proc *p, int want, int *result));
 int	fdavail __P((struct proc *p, int n));
 int	falloc __P((struct proc *p, struct file **resultfp, int *resultfd));
+struct	filedesc *fdinit __P((struct proc *p));
+struct	filedesc *fdshare __P((struct proc *p));
 struct	filedesc *fdcopy __P((struct proc *p));
 void	fdfree __P((struct proc *p));
 #endif