qemu/tools/virtiofsd/passthrough_helpers.h

/*
 * FUSE: Filesystem in Userspace
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE
 */

/*
 * Creates files on the underlying file system in response to a FUSE_MKNOD
 * operation
 */
static int mknod_wrapper(int dirfd, const char *path, const char *link,
                         int mode, dev_t rdev)
{
    int res;

    if (S_ISREG(mode)) {
        res = openat(dirfd, path, O_CREAT | O_EXCL | O_WRONLY, mode);
        if (res >= 0) {
            res = close(res);
        }
    } else if (S_ISDIR(mode)) {
        res = mkdirat(dirfd, path, mode);
    } else if (S_ISLNK(mode) && link != NULL) {
        res = symlinkat(link, dirfd, path);
    } else if (S_ISFIFO(mode)) {
        res = mkfifoat(dirfd, path, mode);
    } else {
        res = mknodat(dirfd, path, mode, rdev);
    }

    return res;
}