Accept uid and gid parameters in utils_mkdir()/utils_mkdir_recursive()
[lttng-tools.git] / src / common / index / index.c
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1/*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19#define _GNU_SOURCE
6c1c0768 20#define _LGPL_SOURCE
309167d2 21#include <assert.h>
1c20f0e2 22#include <sys/stat.h>
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23#include <sys/types.h>
24#include <fcntl.h>
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25
26#include <common/common.h>
27#include <common/defaults.h>
f263b7fd 28#include <common/compat/endian.h>
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29#include <common/utils.h>
30
31#include "index.h"
32
33/*
34 * Create the index file associated with a trace file.
35 *
36 * Return fd on success, a negative value on error.
37 */
38int index_create_file(char *path_name, char *stream_name, int uid, int gid,
39 uint64_t size, uint64_t count)
40{
41 int ret, fd = -1;
6cd525e8 42 ssize_t size_ret;
50adc264 43 struct ctf_packet_index_file_hdr hdr;
1c20f0e2 44 char fullpath[PATH_MAX];
309167d2 45
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46 ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR,
47 path_name);
48 if (ret < 0) {
49 PERROR("snprintf index path");
50 goto error;
51 }
52
53 /* Create index directory if necessary. */
54 ret = run_as_mkdir(fullpath, S_IRWXU | S_IRWXG, uid, gid);
55 if (ret < 0) {
56 if (ret != -EEXIST) {
6347a8b5 57 PERROR("Index trace directory creation error");
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58 goto error;
59 }
60 }
61
62 ret = utils_create_stream_file(fullpath, stream_name, size, count, uid,
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63 gid, DEFAULT_INDEX_FILE_SUFFIX);
64 if (ret < 0) {
65 goto error;
66 }
67 fd = ret;
68
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69 hdr.magic = htobe32(CTF_INDEX_MAGIC);
70 hdr.index_major = htobe32(CTF_INDEX_MAJOR);
71 hdr.index_minor = htobe32(CTF_INDEX_MINOR);
4bc5e7c5 72 hdr.packet_index_len = htobe32(sizeof(struct ctf_packet_index));
309167d2 73
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74 size_ret = lttng_write(fd, &hdr, sizeof(hdr));
75 if (size_ret < sizeof(hdr)) {
309167d2 76 PERROR("write index header");
6cd525e8 77 ret = -1;
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78 goto error;
79 }
80
81 return fd;
82
83error:
84 if (fd >= 0) {
85 int close_ret;
86
87 close_ret = close(fd);
88 if (close_ret < 0) {
89 PERROR("close index fd");
90 }
91 }
92 return ret;
93}
94
95/*
96 * Write index values to the given fd of size len.
97 *
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98 * Return "len" on success or else < len on error. errno contains error
99 * details.
309167d2 100 */
50adc264 101ssize_t index_write(int fd, struct ctf_packet_index *index, size_t len)
309167d2 102{
6cd525e8 103 ssize_t ret;
309167d2 104
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105 assert(index);
106
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107 if (fd < 0) {
108 ret = -EINVAL;
109 goto error;
110 }
111
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112 ret = lttng_write(fd, index, len);
113 if (ret < len) {
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114 PERROR("writing index file");
115 }
116
183f6fa2 117error:
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118 return ret;
119}
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120
121/*
122 * Open index file using a given path, channel name and tracefile count.
123 *
124 * Return read only FD on success or else a negative value.
125 */
126int index_open(const char *path_name, const char *channel_name,
127 uint64_t tracefile_count, uint64_t tracefile_count_current)
128{
129 int ret, read_fd;
130 ssize_t read_len;
131 char fullpath[PATH_MAX];
132 struct ctf_packet_index_file_hdr hdr;
133
134 assert(path_name);
135 assert(channel_name);
136
137 if (tracefile_count > 0) {
138 ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s_%"
139 PRIu64 DEFAULT_INDEX_FILE_SUFFIX, path_name,
140 channel_name, tracefile_count_current);
141 } else {
142 ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s"
143 DEFAULT_INDEX_FILE_SUFFIX, path_name, channel_name);
144 }
145 if (ret < 0) {
146 PERROR("snprintf index path");
147 goto error;
148 }
149
150 DBG("Index opening file %s in read only", fullpath);
151 read_fd = open(fullpath, O_RDONLY);
152 if (read_fd < 0) {
153 if (errno == ENOENT) {
154 ret = -ENOENT;
155 } else {
156 PERROR("opening index in read-only");
157 }
158 goto error;
159 }
160
161 read_len = lttng_read(read_fd, &hdr, sizeof(hdr));
162 if (read_len < 0) {
163 PERROR("Reading index header");
164 goto error_close;
165 }
166
167 if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) {
168 ERR("Invalid header magic");
169 goto error_close;
170 }
171 if (be32toh(hdr.index_major) != CTF_INDEX_MAJOR ||
172 be32toh(hdr.index_minor) != CTF_INDEX_MINOR) {
173 ERR("Invalid header version");
174 goto error_close;
175 }
176
177 return read_fd;
178
179error_close:
180 if (read_fd >= 0) {
181 int close_ret;
182
183 close_ret = close(read_fd);
184 if (close_ret < 0) {
185 PERROR("close read fd %d", read_fd);
186 }
187 }
188 ret = -1;
189
190error:
191 return ret;
192}
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