diff options
Diffstat (limited to 'sys/kern/kern_descrip.c')
| -rw-r--r-- | sys/kern/kern_descrip.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c index 50902f0..754a3cb 100644 --- a/sys/kern/kern_descrip.c +++ b/sys/kern/kern_descrip.c @@ -1415,6 +1415,25 @@ fdshare(struct filedesc *fdp) } /* + * Unshare a filedesc structure, if necessary by making a copy + */ +void +fdunshare(struct proc *p, struct thread *td) +{ + + FILEDESC_LOCK_FAST(p->p_fd); + if (p->p_fd->fd_refcnt > 1) { + struct filedesc *tmp; + + FILEDESC_UNLOCK_FAST(p->p_fd); + tmp = fdcopy(p->p_fd); + fdfree(td); + p->p_fd = tmp; + } else + FILEDESC_UNLOCK_FAST(p->p_fd); +} + +/* * Copy a filedesc structure. * A NULL pointer in returns a NULL reference, this is to ease callers, * not catch errors. |
