| 1 | /* |
| 2 | * context.c |
| 3 | * |
| 4 | * Babeltrace Library |
| 5 | * |
| 6 | * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation |
| 7 | * |
| 8 | * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 9 | * Julien Desfossez <julien.desfossez@efficios.com> |
| 10 | * |
| 11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 12 | * of this software and associated documentation files (the "Software"), to deal |
| 13 | * in the Software without restriction, including without limitation the rights |
| 14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 15 | * copies of the Software, and to permit persons to whom the Software is |
| 16 | * furnished to do so, subject to the following conditions: |
| 17 | * |
| 18 | * The above copyright notice and this permission notice shall be included in |
| 19 | * all copies or substantial portions of the Software. |
| 20 | */ |
| 21 | |
| 22 | #include <babeltrace/babeltrace.h> |
| 23 | #include <babeltrace/context.h> |
| 24 | #include <babeltrace/context-internal.h> |
| 25 | #include <babeltrace/trace-handle.h> |
| 26 | #include <babeltrace/trace-handle-internal.h> |
| 27 | #include <babeltrace/trace-collection.h> |
| 28 | #include <babeltrace/format.h> |
| 29 | #include <stdlib.h> |
| 30 | |
| 31 | #include <fts.h> |
| 32 | #include <fcntl.h> /* For O_RDONLY */ |
| 33 | |
| 34 | /* TODO ybrosseau: should be hidden in the CTF format */ |
| 35 | #include <babeltrace/ctf/types.h> /* for ctf_move_pos_slow */ |
| 36 | |
| 37 | #include <glib.h> |
| 38 | |
| 39 | struct bt_context *bt_context_create(void) |
| 40 | { |
| 41 | struct bt_context *ctx; |
| 42 | |
| 43 | ctx = g_new0(struct bt_context, 1); |
| 44 | ctx->refcount = 1; |
| 45 | /* Negative handle id are errors. */ |
| 46 | ctx->last_trace_handle_id = 0; |
| 47 | |
| 48 | /* Instanciate the trace handle container */ |
| 49 | ctx->trace_handles = g_hash_table_new_full(g_direct_hash, |
| 50 | g_direct_equal, NULL, |
| 51 | (GDestroyNotify) bt_trace_handle_destroy); |
| 52 | |
| 53 | ctx->tc = g_new0(struct trace_collection, 1); |
| 54 | init_trace_collection(ctx->tc); |
| 55 | |
| 56 | return ctx; |
| 57 | } |
| 58 | |
| 59 | int bt_context_add_trace(struct bt_context *ctx, const char *path, |
| 60 | const char *format_str) |
| 61 | { |
| 62 | struct trace_descriptor *td; |
| 63 | struct format *fmt; |
| 64 | struct bt_trace_handle *handle; |
| 65 | |
| 66 | fmt = bt_lookup_format(g_quark_from_string(format_str)); |
| 67 | td = fmt->open_trace(path, O_RDONLY, |
| 68 | ctf_move_pos_slow, NULL); |
| 69 | if (!td) { |
| 70 | fprintf(stdout, "[error] [Context] Cannot open_trace of the format %s .\n\n", |
| 71 | path); |
| 72 | return -1; |
| 73 | } |
| 74 | |
| 75 | /* Create an handle for the trace */ |
| 76 | handle = bt_trace_handle_create(ctx); |
| 77 | if (handle < 0) { |
| 78 | fprintf(stdout, "[error] [Context] Creating trace handle %s .\n\n", |
| 79 | path); |
| 80 | return -1; |
| 81 | } |
| 82 | handle->format = fmt; |
| 83 | handle->td = td; |
| 84 | strncpy(handle->path, path, PATH_MAX); |
| 85 | handle->path[PATH_MAX - 1] = '\0'; |
| 86 | |
| 87 | /* Add new handle to container */ |
| 88 | g_hash_table_insert(ctx->trace_handles, |
| 89 | (gpointer) (unsigned long) handle->id, |
| 90 | handle); |
| 91 | trace_collection_add(ctx->tc, td); |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Unable to open toplevel: failure. |
| 97 | * Unable to open some subdirectory or file: warn and continue; |
| 98 | */ |
| 99 | int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path, |
| 100 | const char *format_str) |
| 101 | { |
| 102 | FTS *tree; |
| 103 | FTSENT *node; |
| 104 | GArray *trace_ids; |
| 105 | char lpath[PATH_MAX]; |
| 106 | char * const paths[2] = { lpath, NULL }; |
| 107 | int ret; |
| 108 | |
| 109 | /* |
| 110 | * Need to copy path, because fts_open can change it. |
| 111 | * It is the pointer array, not the strings, that are constant. |
| 112 | */ |
| 113 | strncpy(lpath, path, PATH_MAX); |
| 114 | lpath[PATH_MAX - 1] = '\0'; |
| 115 | |
| 116 | tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0); |
| 117 | if (tree == NULL) { |
| 118 | fprintf(stdout, "[error] Cannot traverse \"%s\" for reading.\n\n", |
| 119 | path); |
| 120 | return -EINVAL; |
| 121 | } |
| 122 | |
| 123 | trace_ids = g_array_new(FALSE, TRUE, sizeof(int)); |
| 124 | |
| 125 | while ((node = fts_read(tree))) { |
| 126 | int dirfd, metafd; |
| 127 | |
| 128 | if (!(node->fts_info & FTS_D)) |
| 129 | continue; |
| 130 | |
| 131 | dirfd = open(node->fts_accpath, 0); |
| 132 | if (dirfd < 0) { |
| 133 | fprintf(stdout, "[warning] unable to open trace " |
| 134 | "directory file descriptor.\n"); |
| 135 | continue; |
| 136 | } |
| 137 | metafd = openat(dirfd, "metadata", O_RDONLY); |
| 138 | if (metafd < 0) { |
| 139 | ret = close(dirfd); |
| 140 | if (ret < 0) { |
| 141 | perror("close"); |
| 142 | goto error; |
| 143 | } |
| 144 | } else { |
| 145 | int trace_id; |
| 146 | |
| 147 | ret = close(metafd); |
| 148 | if (ret < 0) { |
| 149 | perror("close"); |
| 150 | goto error; |
| 151 | } |
| 152 | ret = close(dirfd); |
| 153 | if (ret < 0) { |
| 154 | perror("close"); |
| 155 | goto error; |
| 156 | } |
| 157 | |
| 158 | trace_id = bt_context_add_trace(ctx, |
| 159 | node->fts_accpath, format_str); |
| 160 | if (trace_id < 0) { |
| 161 | fprintf(stdout, "[warning] CTX opening trace \"%s\"from %s " |
| 162 | "for reading.\n\n", node->fts_accpath, path); |
| 163 | continue; |
| 164 | } |
| 165 | g_array_append_val(trace_ids, trace_id); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | g_array_free(trace_ids, TRUE); |
| 170 | return 0; |
| 171 | |
| 172 | error: |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | void bt_context_remove_trace(struct bt_context *ctx, int handle_id) |
| 177 | { |
| 178 | struct bt_trace_handle *handle; |
| 179 | |
| 180 | handle = g_hash_table_lookup(ctx->trace_handles, |
| 181 | (gpointer) (unsigned long) handle_id); |
| 182 | assert(handle != NULL); |
| 183 | |
| 184 | /* Remove from containers */ |
| 185 | trace_collection_remove(ctx->tc, handle->td); |
| 186 | g_hash_table_remove(ctx->trace_handles, |
| 187 | (gpointer) (unsigned long) handle_id); |
| 188 | |
| 189 | /* Close the trace */ |
| 190 | handle->format->close_trace(handle->td); |
| 191 | |
| 192 | /* Destory the handle */ |
| 193 | bt_trace_handle_destroy(handle); |
| 194 | } |
| 195 | |
| 196 | static |
| 197 | void bt_context_destroy(struct bt_context *ctx) |
| 198 | { |
| 199 | finalize_trace_collection(ctx->tc); |
| 200 | |
| 201 | /* Remote all traces. The g_hash_table_destroy will call |
| 202 | * bt_trace_handle_destroy on each elements. |
| 203 | */ |
| 204 | g_hash_table_destroy(ctx->trace_handles); |
| 205 | |
| 206 | /* ctx->tc should always be valid */ |
| 207 | assert(ctx->tc != NULL); |
| 208 | g_free(ctx->tc); |
| 209 | g_free(ctx); |
| 210 | } |
| 211 | |
| 212 | void bt_context_get(struct bt_context *ctx) |
| 213 | { |
| 214 | ctx->refcount++; |
| 215 | } |
| 216 | |
| 217 | void bt_context_put(struct bt_context *ctx) |
| 218 | { |
| 219 | ctx->refcount--; |
| 220 | if (ctx->refcount == 0) |
| 221 | bt_context_destroy(ctx); |
| 222 | } |