linux-user, arm: add syscall table generation support
[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 #ifdef O_PATH
17 #define O_PATH_9P_UTIL O_PATH
18 #else
19 #define O_PATH_9P_UTIL 0
20 #endif
21
22 static inline void close_preserve_errno(int fd)
23 {
24 int serrno = errno;
25 close(fd);
26 errno = serrno;
27 }
28
29 static inline int openat_dir(int dirfd, const char *name)
30 {
31 return openat(dirfd, name,
32 O_DIRECTORY | O_RDONLY | O_NOFOLLOW | O_PATH_9P_UTIL);
33 }
34
35 static inline int openat_file(int dirfd, const char *name, int flags,
36 mode_t mode)
37 {
38 int fd, serrno, ret;
39
40 fd = openat(dirfd, name, flags | O_NOFOLLOW | O_NOCTTY | O_NONBLOCK,
41 mode);
42 if (fd == -1) {
43 return -1;
44 }
45
46 serrno = errno;
47 /* O_NONBLOCK was only needed to open the file. Let's drop it. We don't
48 * do that with O_PATH since fcntl(F_SETFL) isn't supported, and openat()
49 * ignored it anyway.
50 */
51 if (!(flags & O_PATH_9P_UTIL)) {
52 ret = fcntl(fd, F_SETFL, flags);
53 assert(!ret);
54 }
55 errno = serrno;
56 return fd;
57 }
58
59 ssize_t fgetxattrat_nofollow(int dirfd, const char *path, const char *name,
60 void *value, size_t size);
61 int fsetxattrat_nofollow(int dirfd, const char *path, const char *name,
62 void *value, size_t size, int flags);
63 ssize_t flistxattrat_nofollow(int dirfd, const char *filename,
64 char *list, size_t size);
65 ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
66 const char *name);
67
68 #endif