fs_query.cpp revision 9c5c79ad
1/*
2 * Copyright 2004-2008, Axel D��rfler, axeld@pinc-software.de.
3 * Distributed under the terms of the MIT License.
4 */
5
6
7#include <fs_query.h>
8
9#include <stdlib.h>
10#include <string.h>
11#include <fcntl.h>
12#include <errno.h>
13
14#include <dirent_private.h>
15#include <syscalls.h>
16
17
18static DIR *
19open_query_etc(dev_t device, const char *query,
20	uint32 flags, port_id port, int32 token)
21{
22	if (device < 0 || query == NULL || query[0] == '\0') {
23		errno = B_BAD_VALUE;
24		return NULL;
25	}
26
27	// open
28	int fd = _kern_open_query(device, query, strlen(query), flags, port, token);
29	if (fd < 0) {
30		errno = fd;
31		return NULL;
32	}
33
34	// allocate a DIR
35	DIR *dir = (DIR *)malloc(DIR_BUFFER_SIZE);
36	if (!dir) {
37		_kern_close(fd);
38		errno = B_NO_MEMORY;
39		return NULL;
40	}
41
42	dir->fd = fd;
43	dir->entries_left = 0;
44
45	return dir;
46}
47
48
49DIR *
50fs_open_query(dev_t device, const char *query, uint32 flags)
51{
52	return open_query_etc(device, query, flags, -1, -1);
53}
54
55
56DIR *
57fs_open_live_query(dev_t device, const char *query,
58	uint32 flags, port_id port, int32 token)
59{
60	// check parameters
61	if (port < 0) {
62		errno = B_BAD_VALUE;
63		return NULL;
64	}
65
66	return open_query_etc(device, query, flags | B_LIVE_QUERY, port, token);
67}
68
69
70int
71fs_close_query(DIR *dir)
72{
73	if (dir == NULL) {
74		errno = B_BAD_VALUE;
75		return -1;
76	}
77
78	int fd = dir->fd;
79	free(dir);
80	return _kern_close(fd);
81}
82
83
84struct dirent *
85fs_read_query(DIR *dir)
86{
87	return readdir(dir);
88}
89
90
91status_t
92get_path_for_dirent(struct dirent *dent, char *buffer, size_t length)
93{
94	if (dent == NULL || buffer == NULL)
95		return B_BAD_VALUE;
96
97	return _kern_entry_ref_to_path(dent->d_pdev, dent->d_pino, dent->d_name,
98		buffer, length);
99}
100
101