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

diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
index edc7b61..2aac60d 100644 (file)
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -605,6 +605,50 @@ ffree(fp)
        FREE(fp, M_FILE);
 }
 
+/*
+ * 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.
  */

diff --git a/sys/sys/filedesc.h b/sys/sys/filedesc.h
index e37c7a3..445d78d 100644 (file)
--- 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