linux-master/fs/file.c

54 static void copy_fd_bitmaps(struct fdtable *nfdt, struct fdtable *ofdt,
60 	set = (nfdt->max_fds - count) / BITS_PER_BYTE;
61 	memcpy(nfdt->open_fds, ofdt->open_fds, cpy);
62 	memset((char *)nfdt->open_fds + cpy, 0, set);
63 	memcpy(nfdt->close_on_exec, ofdt->close_on_exec, cpy);
64 	memset((char *)nfdt->close_on_exec + cpy, 0, set);
67 	set = BITBIT_SIZE(nfdt->max_fds) - cpy;
68 	memcpy(nfdt->full_fds_bits, ofdt->full_fds_bits, cpy);
69 	memset((char *)nfdt->full_fds_bits + cpy, 0, set);
76 static void copy_fdtable(struct fdtable *nfdt, struct fdtable *ofdt)
80 	BUG_ON(nfdt->max_fds < ofdt->max_fds);
83 	set = (nfdt->max_fds - ofdt->max_fds) * sizeof(struct file *);
84 	memcpy(nfdt->fd, ofdt->fd, cpy);
85 	memset((char *)nfdt->fd + cpy, 0, set);
87 	copy_fd_bitmaps(nfdt, ofdt, ofdt->max_fds);