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- /* Copyright (C) 2019 Intel Corporation
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * fs.c
- *
- * This file contains codes for implementation of 'eventfd' filesystem.
- */
- #include <asm/fcntl.h>
- #include <asm/unistd.h>
- #include <errno.h>
- #include <linux/fcntl.h>
- #include <linux/stat.h>
- #include <pal.h>
- #include <shim_fs.h>
- #include <shim_handle.h>
- #include <shim_internal.h>
- static ssize_t eventfd_read(struct shim_handle* hdl, void* buf, size_t count) {
- if (count < sizeof(uint64_t))
- return -EINVAL;
- PAL_NUM bytes = DkStreamRead(hdl->pal_handle, 0, count, buf, NULL, 0);
- if (bytes == PAL_STREAM_ERROR)
- return -PAL_ERRNO;
- return (ssize_t)bytes;
- }
- static ssize_t eventfd_write(struct shim_handle* hdl, const void* buf, size_t count) {
- if (count < sizeof(uint64_t))
- return -EINVAL;
- PAL_NUM bytes = DkStreamWrite(hdl->pal_handle, 0, count, (void*)buf, NULL);
- if (bytes == PAL_STREAM_ERROR)
- return -PAL_ERRNO;
- return (ssize_t)bytes;
- }
- static off_t eventfd_poll(struct shim_handle* hdl, int poll_type) {
- off_t ret = 0;
- lock(&hdl->lock);
- if (!hdl->pal_handle) {
- ret = -EBADF;
- goto out;
- }
- PAL_STREAM_ATTR attr;
- if (!DkStreamAttributesQueryByHandle(hdl->pal_handle, &attr)) {
- ret = -PAL_ERRNO;
- goto out;
- }
- if (poll_type == FS_POLL_SZ) {
- ret = attr.pending_size;
- goto out;
- }
- ret = 0;
- if (attr.disconnected)
- ret |= FS_POLL_ER;
- if ((poll_type & FS_POLL_RD) && attr.readable)
- ret |= FS_POLL_RD;
- if ((poll_type & FS_POLL_WR) && attr.writable)
- ret |= FS_POLL_WR;
- out:
- unlock(&hdl->lock);
- return ret;
- }
- struct shim_fs_ops eventfd_fs_ops = {
- .read = &eventfd_read,
- .write = &eventfd_write,
- .poll = &eventfd_poll,
- };
- struct shim_mount eventfd_builtin_fs = {
- .type = URI_TYPE_EVENTFD,
- .fs_ops = &eventfd_fs_ops,
- };
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