| 1 | /* |
| 2 | * Copyright 2016 - Philippe Proulx <pproulx@efficios.com> |
| 3 | * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <stdint.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <stdbool.h> |
| 29 | #include <glib.h> |
| 30 | #include <inttypes.h> |
| 31 | #include <sys/mman.h> |
| 32 | #include <babeltrace/ctf-ir/stream.h> |
| 33 | #include <babeltrace/plugin/notification/iterator.h> |
| 34 | #include "file.h" |
| 35 | #include "metadata.h" |
| 36 | #include "../common/notif-iter/notif-iter.h" |
| 37 | #include <assert.h> |
| 38 | #include "data-stream.h" |
| 39 | |
| 40 | #define PRINT_ERR_STREAM ctf_fs->error_fp |
| 41 | #define PRINT_PREFIX "ctf-fs-data-stream" |
| 42 | #include "print.h" |
| 43 | |
| 44 | static |
| 45 | size_t remaining_mmap_bytes(struct ctf_fs_stream *stream) |
| 46 | { |
| 47 | return stream->mmap_valid_len - stream->request_offset; |
| 48 | } |
| 49 | |
| 50 | static |
| 51 | int stream_munmap(struct ctf_fs_stream *stream) |
| 52 | { |
| 53 | int ret = 0; |
| 54 | struct ctf_fs_component *ctf_fs = stream->file->ctf_fs; |
| 55 | |
| 56 | if (munmap(stream->mmap_addr, stream->mmap_len)) { |
| 57 | PERR("Cannot memory-unmap address %p (size %zu) of file \"%s\" (%p): %s\n", |
| 58 | stream->mmap_addr, stream->mmap_len, |
| 59 | stream->file->path->str, stream->file->fp, |
| 60 | strerror(errno)); |
| 61 | ret = -1; |
| 62 | goto end; |
| 63 | } |
| 64 | end: |
| 65 | return ret; |
| 66 | } |
| 67 | |
| 68 | static |
| 69 | int mmap_next(struct ctf_fs_stream *stream) |
| 70 | { |
| 71 | int ret = 0; |
| 72 | struct ctf_fs_component *ctf_fs = stream->file->ctf_fs; |
| 73 | |
| 74 | /* Unmap old region */ |
| 75 | if (stream->mmap_addr) { |
| 76 | if (stream_munmap(stream)) { |
| 77 | goto error; |
| 78 | } |
| 79 | |
| 80 | stream->mmap_offset += stream->mmap_valid_len; |
| 81 | stream->request_offset = 0; |
| 82 | } |
| 83 | |
| 84 | stream->mmap_valid_len = MIN(stream->file->size - stream->mmap_offset, |
| 85 | stream->mmap_max_len); |
| 86 | /* Round up to next page, assuming page size being a power of 2. */ |
| 87 | stream->mmap_len = (stream->mmap_valid_len + ctf_fs->page_size - 1) |
| 88 | & ~(ctf_fs->page_size - 1); |
| 89 | /* Map new region */ |
| 90 | stream->mmap_addr = mmap((void *) 0, stream->mmap_len, |
| 91 | PROT_READ, MAP_PRIVATE, fileno(stream->file->fp), |
| 92 | stream->mmap_offset); |
| 93 | if (stream->mmap_addr == MAP_FAILED) { |
| 94 | PERR("Cannot memory-map address (size %zu) of file \"%s\" (%p) at offset %zu: %s\n", |
| 95 | stream->mmap_len, stream->file->path->str, |
| 96 | stream->file->fp, stream->mmap_offset, |
| 97 | strerror(errno)); |
| 98 | goto error; |
| 99 | } |
| 100 | |
| 101 | goto end; |
| 102 | error: |
| 103 | stream_munmap(stream); |
| 104 | ret = -1; |
| 105 | end: |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | static |
| 110 | enum bt_ctf_notif_iter_medium_status medop_request_bytes( |
| 111 | size_t request_sz, uint8_t **buffer_addr, |
| 112 | size_t *buffer_sz, void *data) |
| 113 | { |
| 114 | enum bt_ctf_notif_iter_medium_status status = |
| 115 | BT_CTF_NOTIF_ITER_MEDIUM_STATUS_OK; |
| 116 | struct ctf_fs_stream *stream = data; |
| 117 | struct ctf_fs_component *ctf_fs = stream->file->ctf_fs; |
| 118 | |
| 119 | if (request_sz == 0) { |
| 120 | goto end; |
| 121 | } |
| 122 | |
| 123 | /* Check if we have at least one memory-mapped byte left */ |
| 124 | if (remaining_mmap_bytes(stream) == 0) { |
| 125 | /* Are we at the end of the file? */ |
| 126 | if (stream->request_offset >= stream->file->size) { |
| 127 | PDBG("Reached end of file \"%s\" (%p)\n", |
| 128 | stream->file->path->str, stream->file->fp); |
| 129 | status = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_EOF; |
| 130 | goto end; |
| 131 | } |
| 132 | |
| 133 | if (mmap_next(stream)) { |
| 134 | PERR("Cannot memory-map next region of file \"%s\" (%p)\n", |
| 135 | stream->file->path->str, stream->file->fp); |
| 136 | goto error; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | *buffer_sz = MIN(remaining_mmap_bytes(stream), request_sz); |
| 141 | *buffer_addr = ((uint8_t *) stream->mmap_addr) + stream->request_offset; |
| 142 | stream->request_offset += *buffer_sz; |
| 143 | goto end; |
| 144 | |
| 145 | error: |
| 146 | status = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_ERROR; |
| 147 | |
| 148 | end: |
| 149 | return status; |
| 150 | } |
| 151 | |
| 152 | static |
| 153 | struct bt_ctf_stream *medop_get_stream( |
| 154 | struct bt_ctf_stream_class *stream_class, void *data) |
| 155 | { |
| 156 | struct ctf_fs_stream *fs_stream = data; |
| 157 | struct ctf_fs_component *ctf_fs = fs_stream->file->ctf_fs; |
| 158 | |
| 159 | if (!fs_stream->stream) { |
| 160 | int64_t id = bt_ctf_stream_class_get_id(stream_class); |
| 161 | |
| 162 | PDBG("Creating stream out of stream class %" PRId64 "\n", id); |
| 163 | fs_stream->stream = bt_ctf_stream_create(stream_class, |
| 164 | fs_stream->file->path->str); |
| 165 | if (!fs_stream->stream) { |
| 166 | PERR("Cannot create stream (stream class %" PRId64 ")\n", |
| 167 | id); |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | return fs_stream->stream; |
| 172 | } |
| 173 | |
| 174 | static struct bt_ctf_notif_iter_medium_ops medops = { |
| 175 | .request_bytes = medop_request_bytes, |
| 176 | .get_stream = medop_get_stream, |
| 177 | }; |
| 178 | |
| 179 | BT_HIDDEN |
| 180 | struct ctf_fs_stream *ctf_fs_stream_create( |
| 181 | struct ctf_fs_component *ctf_fs, struct ctf_fs_file *file) |
| 182 | { |
| 183 | struct ctf_fs_stream *stream = g_new0(struct ctf_fs_stream, 1); |
| 184 | |
| 185 | if (!stream) { |
| 186 | goto error; |
| 187 | } |
| 188 | |
| 189 | stream->file = file; |
| 190 | stream->notif_iter = bt_ctf_notif_iter_create(ctf_fs->metadata->trace, |
| 191 | ctf_fs->page_size, medops, stream, ctf_fs->error_fp); |
| 192 | if (!stream->notif_iter) { |
| 193 | goto error; |
| 194 | } |
| 195 | |
| 196 | stream->mmap_max_len = ctf_fs->page_size * 2048; |
| 197 | goto end; |
| 198 | error: |
| 199 | /* Do not touch "borrowed" file. */ |
| 200 | stream->file = NULL; |
| 201 | ctf_fs_stream_destroy(stream); |
| 202 | stream = NULL; |
| 203 | end: |
| 204 | return stream; |
| 205 | } |
| 206 | |
| 207 | BT_HIDDEN |
| 208 | void ctf_fs_stream_destroy(struct ctf_fs_stream *stream) |
| 209 | { |
| 210 | if (!stream) { |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | if (stream->file) { |
| 215 | ctf_fs_file_destroy(stream->file); |
| 216 | } |
| 217 | |
| 218 | if (stream->stream) { |
| 219 | BT_PUT(stream->stream); |
| 220 | } |
| 221 | |
| 222 | if (stream->notif_iter) { |
| 223 | bt_ctf_notif_iter_destroy(stream->notif_iter); |
| 224 | } |
| 225 | |
| 226 | g_free(stream); |
| 227 | } |