--- /dev/null
+/*
+ * Copyright 2019 Philippe Proulx <pproulx@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define BT_LOG_TAG "CTFSER"
+#include "logging.h"
+
+#include <unistd.h>
+#include <string.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "common/assert.h"
+#include <stdarg.h>
+#include <ctype.h>
+#include <glib.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <wchar.h>
+#include <stdbool.h>
+#include "common/babeltrace.h"
+#include "common/common.h"
+#include "ctfser/ctfser.h"
+#include "compat/unistd.h"
+#include "compat/fcntl.h"
+
+static inline
+uint64_t get_packet_size_increment_bytes(void)
+{
+ return bt_common_get_page_size() * 8;
+}
+
+static inline
+void mmap_align_ctfser(struct bt_ctfser *ctfser)
+{
+ ctfser->base_mma = mmap_align(ctfser->cur_packet_size_bytes,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED, ctfser->fd, ctfser->mmap_offset);
+}
+
+BT_HIDDEN
+int _bt_ctfser_increase_cur_packet_size(struct bt_ctfser *ctfser)
+{
+ int ret;
+
+ BT_ASSERT(ctfser);
+ BT_LOGV("Increasing stream file's current packet size: "
+ "path=\"%s\", fd=%d, "
+ "offset-in-cur-packet-bits=%" PRIu64 ", "
+ "cur-packet-size-bytes=%" PRIu64,
+ ctfser->path->str, ctfser->fd,
+ ctfser->offset_in_cur_packet_bits,
+ ctfser->cur_packet_size_bytes);
+ ret = munmap_align(ctfser->base_mma);
+ if (ret) {
+ BT_LOGE_ERRNO("Failed to perform an aligned memory unmapping",
+ ": ret=%d", ret);
+ goto end;
+ }
+
+ ctfser->cur_packet_size_bytes += get_packet_size_increment_bytes();
+
+ do {
+ ret = bt_posix_fallocate(ctfser->fd, ctfser->mmap_offset,
+ ctfser->cur_packet_size_bytes);
+ } while (ret == EINTR);
+
+ if (ret) {
+ BT_LOGE("Failed to preallocate memory space: ret=%d", ret);
+ goto end;
+ }
+
+ mmap_align_ctfser(ctfser);
+ if (ctfser->base_mma == MAP_FAILED) {
+ BT_LOGE_ERRNO("Failed to perform an aligned memory mapping",
+ ": ret=%d", ret);
+ ret = -1;
+ goto end;
+ }
+
+ BT_LOGV("Increased packet size: "
+ "path=\"%s\", fd=%d, "
+ "offset-in-cur-packet-bits=%" PRIu64 ", "
+ "new-packet-size-bytes=%" PRIu64,
+ ctfser->path->str, ctfser->fd,
+ ctfser->offset_in_cur_packet_bits,
+ ctfser->cur_packet_size_bytes);
+
+end:
+ return ret;
+}
+
+BT_HIDDEN
+int bt_ctfser_init(struct bt_ctfser *ctfser, const char *path)
+{
+ int ret = 0;
+
+ BT_ASSERT(ctfser);
+ memset(ctfser, 0, sizeof(*ctfser));
+ ctfser->fd = open(path, O_RDWR | O_CREAT | O_TRUNC,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (ctfser->fd < 0) {
+ BT_LOGW_ERRNO("Failed to open stream file for writing",
+ ": path=\"%s\", ret=%d",
+ path, ctfser->fd);
+ ret = -1;
+ goto end;
+ }
+
+ ctfser->path = g_string_new(path);
+
+end:
+ return ret;
+}
+
+BT_HIDDEN
+int bt_ctfser_fini(struct bt_ctfser *ctfser)
+{
+ int ret = 0;
+
+ if (ctfser->fd == -1) {
+ goto free_path;
+ }
+
+ /*
+ * Truncate the stream file's size to the minimum required to
+ * fit the last packet as we might have grown it too much during
+ * the last memory map.
+ */
+ do {
+ ret = ftruncate(ctfser->fd, ctfser->stream_size_bytes);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret) {
+ BT_LOGE_ERRNO("Failed to truncate stream file",
+ ": ret=%d, size-bytes=%" PRIu64,
+ ret, ctfser->stream_size_bytes);
+ goto end;
+ }
+
+ if (ctfser->base_mma) {
+ /* Unmap old base */
+ ret = munmap_align(ctfser->base_mma);
+ if (ret) {
+ BT_LOGE_ERRNO("Failed to unmap stream file",
+ ": ret=%d, size-bytes=%" PRIu64,
+ ret, ctfser->stream_size_bytes);
+ goto end;
+ }
+
+ ctfser->base_mma = NULL;
+ }
+
+ ret = close(ctfser->fd);
+ if (ret) {
+ BT_LOGE_ERRNO("Failed to close stream file",
+ ": ret=%d", ret);
+ goto end;
+ }
+
+ ctfser->fd = -1;
+
+free_path:
+ if (ctfser->path) {
+ g_string_free(ctfser->path, TRUE);
+ ctfser->path = NULL;
+ }
+
+end:
+ return ret;
+}
+
+BT_HIDDEN
+int bt_ctfser_open_packet(struct bt_ctfser *ctfser)
+{
+ int ret = 0;
+
+ BT_LOGV("Opening packet: path=\"%s\", fd=%d, "
+ "prev-packet-size-bytes=%" PRIu64,
+ ctfser->path->str, ctfser->fd,
+ ctfser->prev_packet_size_bytes);
+
+ if (ctfser->base_mma) {
+ /* Unmap old base (previous packet) */
+ ret = munmap_align(ctfser->base_mma);
+ if (ret) {
+ BT_LOGE_ERRNO("Failed to unmap stream file",
+ ": ret=%d, size-bytes=%" PRIu64,
+ ret, ctfser->stream_size_bytes);
+ goto end;
+ }
+
+ ctfser->base_mma = NULL;
+ }
+
+ /*
+ * Add the previous packet's size to the memory map address
+ * offset to start writing immediately after it.
+ */
+ ctfser->mmap_offset += ctfser->prev_packet_size_bytes;
+ ctfser->prev_packet_size_bytes = 0;
+
+ /* Make initial space for the current packet */
+ ctfser->cur_packet_size_bytes = get_packet_size_increment_bytes();
+
+ do {
+ ret = bt_posix_fallocate(ctfser->fd, ctfser->mmap_offset,
+ ctfser->cur_packet_size_bytes);
+ } while (ret == EINTR);
+
+ if (ret) {
+ BT_LOGE("Failed to preallocate memory space: ret=%d", ret);
+ goto end;
+ }
+
+ /* Start writing at the beginning of the current packet */
+ ctfser->offset_in_cur_packet_bits = 0;
+
+ /* Get new base address */
+ mmap_align_ctfser(ctfser);
+ if (ctfser->base_mma == MAP_FAILED) {
+ BT_LOGE_ERRNO("Failed to perform an aligned memory mapping",
+ ": ret=%d", ret);
+ ret = -1;
+ goto end;
+ }
+
+ BT_LOGV("Opened packet: path=\"%s\", fd=%d, "
+ "cur-packet-size-bytes=%" PRIu64,
+ ctfser->path->str, ctfser->fd,
+ ctfser->cur_packet_size_bytes);
+
+end:
+ return ret;
+}
+
+BT_HIDDEN
+void bt_ctfser_close_current_packet(struct bt_ctfser *ctfser,
+ uint64_t packet_size_bytes)
+{
+ BT_LOGV("Closing packet: path=\"%s\", fd=%d, "
+ "offset-in-cur-packet-bits=%" PRIu64
+ "cur-packet-size-bytes=%" PRIu64,
+ ctfser->path->str, ctfser->fd,
+ ctfser->offset_in_cur_packet_bits,
+ ctfser->cur_packet_size_bytes);
+
+ /*
+ * This will be used during the next call to
+ * bt_ctfser_open_packet(): we add
+ * `ctfser->prev_packet_size_bytes` to the current memory map
+ * address offset (first byte of _this_ packet), effectively
+ * making _this_ packet the required size.
+ */
+ ctfser->prev_packet_size_bytes = packet_size_bytes;
+ ctfser->stream_size_bytes += packet_size_bytes;
+ BT_LOGV("Closed packet: path=\"%s\", fd=%d, "
+ "stream-file-size-bytes=%" PRIu64,
+ ctfser->path->str, ctfser->fd,
+ ctfser->stream_size_bytes);
+}
projects / babeltrace.git / blobdiff