sm501: Add missing arbitration control register
[qemu.git] / hw / 9pfs / 9p-util.c
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 #include "qemu/osdep.h"
14 #include "qemu/xattr.h"
15 #include "9p-util.h"
16
17 int relative_openat_nofollow(int dirfd, const char *path, int flags,
18 mode_t mode)
19 {
20 int fd;
21
22 fd = dup(dirfd);
23 if (fd == -1) {
24 return -1;
25 }
26
27 while (*path) {
28 const char *c;
29 int next_fd;
30 char *head;
31
32 /* Only relative paths without consecutive slashes */
33 assert(path[0] != '/');
34
35 head = g_strdup(path);
36 c = strchr(path, '/');
37 if (c) {
38 head[c - path] = 0;
39 next_fd = openat_dir(fd, head);
40 } else {
41 next_fd = openat_file(fd, head, flags, mode);
42 }
43 g_free(head);
44 if (next_fd == -1) {
45 close_preserve_errno(fd);
46 return -1;
47 }
48 close(fd);
49 fd = next_fd;
50
51 if (!c) {
52 break;
53 }
54 path = c + 1;
55 }
56
57 return fd;
58 }
59
60 ssize_t fgetxattrat_nofollow(int dirfd, const char *filename, const char *name,
61 void *value, size_t size)
62 {
63 char *proc_path = g_strdup_printf("/proc/self/fd/%d/%s", dirfd, filename);
64 int ret;
65
66 ret = lgetxattr(proc_path, name, value, size);
67 g_free(proc_path);
68 return ret;
69 }