sm501: Add missing arbitration control register
[qemu.git] / hw / 9pfs / 9p-util.h
1 /*
2 * 9p utilities
3 *
4 * Copyright IBM, Corp. 2017
5 *
6 * Authors:
7 * Greg Kurz <groug@kaod.org>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 */
12
13 #ifndef QEMU_9P_UTIL_H
14 #define QEMU_9P_UTIL_H
15
16 static inline void close_preserve_errno(int fd)
17 {
18 int serrno = errno;
19 close(fd);
20 errno = serrno;
21 }
22
23 static inline int openat_dir(int dirfd, const char *name)
24 {
25 #ifdef O_PATH
26 #define OPENAT_DIR_O_PATH O_PATH
27 #else
28 #define OPENAT_DIR_O_PATH 0
29 #endif
30 return openat(dirfd, name,
31 O_DIRECTORY | O_RDONLY | O_NOFOLLOW | OPENAT_DIR_O_PATH);
32 }
33
34 static inline int openat_file(int dirfd, const char *name, int flags,
35 mode_t mode)
36 {
37 int fd, serrno, ret;
38
39 fd = openat(dirfd, name, flags | O_NOFOLLOW | O_NOCTTY | O_NONBLOCK,
40 mode);
41 if (fd == -1) {
42 return -1;
43 }
44
45 serrno = errno;
46 /* O_NONBLOCK was only needed to open the file. Let's drop it. */
47 ret = fcntl(fd, F_SETFL, flags);
48 assert(!ret);
49 errno = serrno;
50 return fd;
51 }
52
53 int relative_openat_nofollow(int dirfd, const char *path, int flags,
54 mode_t mode);
55 ssize_t fgetxattrat_nofollow(int dirfd, const char *path, const char *name,
56 void *value, size_t size);
57 int fsetxattrat_nofollow(int dirfd, const char *path, const char *name,
58 void *value, size_t size, int flags);
59
60 #endif