Fix: Remove test_seek_empty_packet and test_seek_big_trace from SCRIPT_LIST
[babeltrace.git] / converter / babeltrace.c
index 54efdfe0b0aa288be3ec47ef6c85b7182f484634..d80b1198fafe2cb58dacca8bc185f75bcf2b0f97 100644 (file)
  *
  * 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 _GNU_SOURCE
-#include <config.h>
 #include <babeltrace/babeltrace.h>
 #include <babeltrace/format.h>
 #include <babeltrace/context.h>
+#include <babeltrace/context-internal.h>
 #include <babeltrace/ctf/types.h>
 #include <babeltrace/ctf/events.h>
+/* TODO: fix object model for format-agnostic callbacks */
+#include <babeltrace/ctf/events-internal.h>
 #include <babeltrace/ctf/iterator.h>
 #include <babeltrace/ctf-text/types.h>
+#include <babeltrace/debuginfo.h>
+
 #include <babeltrace/iterator.h>
 #include <popt.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <inttypes.h>
-#include <fts.h>
+#include <ftw.h>
+#include <string.h>
 
 #include <babeltrace/ctf-ir/metadata.h>        /* for clocks */
 
+#define PARTIAL_ERROR_SLEEP    3       /* 3 seconds */
+
 #define DEFAULT_FILE_ARRAY_SIZE        1
-static char *opt_input_format;
-static char *opt_output_format;
 
-static const char *opt_input_path;
-static const char *opt_output_path;
+#define NET_URL_PREFIX "net://"
+#define NET4_URL_PREFIX        "net4://"
+#define NET6_URL_PREFIX        "net6://"
 
-static struct format *fmt_read;
+static char *opt_input_format, *opt_output_format;
+
+/*
+ * We are not freeing opt_input_paths ipath elements when exiting from
+ * main() for backward compatibility with libpop 0.13, which does not
+ * allocate copies for arguments returned by poptGetArg(), and for
+ * general compatibility with the documented behavior. This is known to
+ * cause a small memory leak with libpop 0.16.
+ */
+static GPtrArray *opt_input_paths;
+static char *opt_output_path;
+static int opt_stream_intersection;
 
+static struct bt_format *fmt_read;
+
+static
 void strlower(char *str)
 {
        while (*str) {
-               *str = tolower(*str);
+               *str = tolower((int) *str);
                str++;
        }
 }
 
 enum {
        OPT_NONE = 0,
+       OPT_OUTPUT_PATH,
+       OPT_INPUT_FORMAT,
+       OPT_OUTPUT_FORMAT,
        OPT_HELP,
        OPT_LIST,
        OPT_VERBOSE,
@@ -68,17 +98,31 @@ enum {
        OPT_FIELDS,
        OPT_NO_DELTA,
        OPT_CLOCK_OFFSET,
-       OPT_CLOCK_RAW,
+       OPT_CLOCK_OFFSET_NS,
+       OPT_CLOCK_CYCLES,
        OPT_CLOCK_SECONDS,
        OPT_CLOCK_DATE,
        OPT_CLOCK_GMT,
        OPT_CLOCK_FORCE_CORRELATE,
+       OPT_STREAM_INTERSECTION,
+       OPT_DEBUG_INFO_DIR,
+       OPT_DEBUG_INFO_FULL_PATH,
+       OPT_DEBUG_INFO_TARGET_PREFIX,
 };
 
+/*
+ * We are _not_ using POPT_ARG_STRING ability to store directly into
+ * variables, because we want to cast the return to non-const, which is
+ * not possible without using poptGetOptArg explicitly. This helps us
+ * controlling memory allocation correctly without making assumptions
+ * about undocumented behaviors. poptGetOptArg is documented as
+ * requiring the returned const char * to be freed by the caller.
+ */
 static struct poptOption long_options[] = {
        /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
-       { "input-format", 'i', POPT_ARG_STRING, &opt_input_format, OPT_NONE, NULL, NULL },
-       { "output-format", 'o', POPT_ARG_STRING, &opt_output_format, OPT_NONE, NULL, NULL },
+       { "output", 'w', POPT_ARG_STRING, NULL, OPT_OUTPUT_PATH, NULL, NULL },
+       { "input-format", 'i', POPT_ARG_STRING, NULL, OPT_INPUT_FORMAT, NULL, NULL },
+       { "output-format", 'o', POPT_ARG_STRING, NULL, OPT_OUTPUT_FORMAT, NULL, NULL },
        { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
        { "list", 'l', POPT_ARG_NONE, NULL, OPT_LIST, NULL, NULL },
        { "verbose", 'v', POPT_ARG_NONE, NULL, OPT_VERBOSE, NULL, NULL },
@@ -87,11 +131,18 @@ static struct poptOption long_options[] = {
        { "fields", 'f', POPT_ARG_STRING, NULL, OPT_FIELDS, NULL, NULL },
        { "no-delta", 0, POPT_ARG_NONE, NULL, OPT_NO_DELTA, NULL, NULL },
        { "clock-offset", 0, POPT_ARG_STRING, NULL, OPT_CLOCK_OFFSET, NULL, NULL },
-       { "clock-raw", 0, POPT_ARG_NONE, NULL, OPT_CLOCK_RAW, NULL, NULL },
+       { "clock-offset-ns", 0, POPT_ARG_STRING, NULL, OPT_CLOCK_OFFSET_NS, NULL, NULL },
+       { "clock-cycles", 0, POPT_ARG_NONE, NULL, OPT_CLOCK_CYCLES, NULL, NULL },
        { "clock-seconds", 0, POPT_ARG_NONE, NULL, OPT_CLOCK_SECONDS, NULL, NULL },
        { "clock-date", 0, POPT_ARG_NONE, NULL, OPT_CLOCK_DATE, NULL, NULL },
        { "clock-gmt", 0, POPT_ARG_NONE, NULL, OPT_CLOCK_GMT, NULL, NULL },
        { "clock-force-correlate", 0, POPT_ARG_NONE, NULL, OPT_CLOCK_FORCE_CORRELATE, NULL, NULL },
+       { "stream-intersection", 0, POPT_ARG_NONE, NULL, OPT_STREAM_INTERSECTION, NULL, NULL },
+#ifdef ENABLE_DEBUGINFO
+       { "debug-info-dir", 0, POPT_ARG_STRING, NULL, OPT_DEBUG_INFO_DIR, NULL, NULL },
+       { "debug-info-full-path", 0, POPT_ARG_NONE, NULL, OPT_DEBUG_INFO_FULL_PATH, NULL, NULL },
+       { "debug-info-target-prefix", 0, POPT_ARG_STRING, NULL, OPT_DEBUG_INFO_TARGET_PREFIX, NULL, NULL },
+#endif
        { NULL, 0, 0, NULL, 0, NULL, NULL },
 };
 
@@ -104,10 +155,11 @@ static void list_formats(FILE *fp)
 static void usage(FILE *fp)
 {
        fprintf(fp, "BabelTrace Trace Viewer and Converter %s\n\n", VERSION);
-       fprintf(fp, "usage : babeltrace [OPTIONS] INPUT <OUTPUT>\n");
+       fprintf(fp, "usage : babeltrace [OPTIONS] FILE...\n");
        fprintf(fp, "\n");
-       fprintf(fp, "  INPUT                          Input trace path\n");
-       fprintf(fp, "  OUTPUT                         Output trace path (default: stdout)\n");
+       fprintf(fp, "  FILE                           Input trace file(s) and/or directory(ies)\n");
+       fprintf(fp, "                                     (space-separated)\n");
+       fprintf(fp, "  -w, --output OUTPUT            Output trace path (default: stdout)\n");
        fprintf(fp, "\n");
        fprintf(fp, "  -i, --input-format FORMAT      Input trace format (default: ctf)\n");
        fprintf(fp, "  -o, --output-format FORMAT     Output trace format (default: text)\n");
@@ -121,19 +173,28 @@ static void usage(FILE *fp)
        fprintf(fp, "      --no-delta                 Do not print time delta between consecutive events\n");
        fprintf(fp, "  -n, --names name1<,name2,...>  Print field names:\n");
        fprintf(fp, "                                     (payload OR args OR arg)\n");
-       fprintf(fp, "                                     all, scope, header, (context OR ctx)\n");
-       fprintf(fp, "                                        (payload active by default)\n");
+       fprintf(fp, "                                     none, all, scope, header, (context OR ctx)\n");
+       fprintf(fp, "                                        (default: payload,context)\n");
        fprintf(fp, "  -f, --fields name1<,name2,...> Print additional fields:\n");
-       fprintf(fp, "                                     all, trace, trace:domain, trace:procname,\n");
-       fprintf(fp, "                                     trace:vpid, loglevel.\n");
-       fprintf(fp, "      --clock-raw                Disregard internal clock offset (use raw value)\n");
+       fprintf(fp, "                                     all, trace, trace:hostname, trace:domain,\n");
+       fprintf(fp, "                                     trace:procname, trace:vpid, loglevel, emf, callsite.\n");
+       fprintf(fp, "                                     (default: trace:hostname,trace:procname,trace:vpid)\n");
+       fprintf(fp, "      --clock-cycles             Timestamp in cycles\n");
        fprintf(fp, "      --clock-offset seconds     Clock offset in seconds\n");
+       fprintf(fp, "      --clock-offset-ns ns       Clock offset in nanoseconds\n");
        fprintf(fp, "      --clock-seconds            Print the timestamps as [sec.ns]\n");
        fprintf(fp, "                                 (default is: [hh:mm:ss.ns])\n");
        fprintf(fp, "      --clock-date               Print clock date\n");
        fprintf(fp, "      --clock-gmt                Print clock in GMT time zone (default: local time zone)\n");
        fprintf(fp, "      --clock-force-correlate    Assume that clocks are inherently correlated\n");
        fprintf(fp, "                                 across traces.\n");
+       fprintf(fp, "      --stream-intersection      Only print events when all streams are active.\n");
+#ifdef ENABLE_DEBUGINFO
+       fprintf(fp, "      --debug-info-dir           Directory in which to look for debugging information\n");
+       fprintf(fp, "                                 files. (default: /usr/lib/debug/)\n");
+       fprintf(fp, "      --debug-info-target-prefix Directory to use as a prefix for executable lookup\n");
+       fprintf(fp, "      --debug-info-full-path     Show full debug info source and binary paths (if available)\n");
+#endif
        list_formats(fp);
        fprintf(fp, "\n");
 }
@@ -141,8 +202,10 @@ static void usage(FILE *fp)
 static int get_names_args(poptContext *pc)
 {
        char *str, *strlist, *strctx;
+       int ret = 0;
 
        opt_payload_field_names = 0;
+       opt_context_field_names = 0;
        strlist = (char *) poptGetOptArg(*pc);
        if (!strlist) {
                return -EINVAL;
@@ -159,17 +222,27 @@ static int get_names_args(poptContext *pc)
                        opt_header_field_names = 1;
                else if (!strcmp(str, "payload") || !strcmp(str, "args") || !strcmp(str, "arg"))
                        opt_payload_field_names = 1;
-               else {
+               else if (!strcmp(str, "none")) {
+                       opt_all_field_names = 0;
+                       opt_scope_field_names = 0;
+                       opt_context_field_names = 0;
+                       opt_header_field_names = 0;
+                       opt_payload_field_names = 0;
+               } else {
                        fprintf(stderr, "[error] unknown field name type %s\n", str);
-                       return -EINVAL;
+                       ret = -EINVAL;
+                       goto end;
                }
        } while ((str = strtok_r(NULL, ",", &strctx)));
-       return 0;
+end:
+       free(strlist);
+       return ret;
 }
 
 static int get_fields_args(poptContext *pc)
 {
        char *str, *strlist, *strctx;
+       int ret = 0;
 
        strlist = (char *) poptGetOptArg(*pc);
        if (!strlist) {
@@ -177,10 +250,13 @@ static int get_fields_args(poptContext *pc)
        }
        str = strtok_r(strlist, ",", &strctx);
        do {
+               opt_trace_default_fields = 0;
                if (!strcmp(str, "all"))
                        opt_all_fields = 1;
                else if (!strcmp(str, "trace"))
                        opt_trace_field = 1;
+               else if (!strcmp(str, "trace:hostname"))
+                       opt_trace_hostname_field = 1;
                else if (!strcmp(str, "trace:domain"))
                        opt_trace_domain_field = 1;
                else if (!strcmp(str, "trace:procname"))
@@ -189,12 +265,19 @@ static int get_fields_args(poptContext *pc)
                        opt_trace_vpid_field = 1;
                else if (!strcmp(str, "loglevel"))
                        opt_loglevel_field = 1;
+               else if (!strcmp(str, "emf"))
+                       opt_emf_field = 1;
+               else if (!strcmp(str, "callsite"))
+                       opt_callsite_field = 1;
                else {
                        fprintf(stderr, "[error] unknown field type %s\n", str);
-                       return -EINVAL;
+                       ret = -EINVAL;
+                       goto end;
                }
        } while ((str = strtok_r(NULL, ",", &strctx)));
-       return 0;
+end:
+       free(strlist);
+       return ret;
 }
 
 /*
@@ -205,6 +288,7 @@ static int parse_options(int argc, char **argv)
 {
        poptContext pc;
        int opt, ret = 0;
+       const char *ipath;
 
        if (argc == 1) {
                usage(stdout);
@@ -215,10 +299,32 @@ static int parse_options(int argc, char **argv)
        poptReadDefaultConfig(pc, 0);
 
        /* set default */
+       opt_context_field_names = 1;
        opt_payload_field_names = 1;
 
        while ((opt = poptGetNextOpt(pc)) != -1) {
                switch (opt) {
+               case OPT_OUTPUT_PATH:
+                       opt_output_path = (char *) poptGetOptArg(pc);
+                       if (!opt_output_path) {
+                               ret = -EINVAL;
+                               goto end;
+                       }
+                       break;
+               case OPT_INPUT_FORMAT:
+                       opt_input_format = (char *) poptGetOptArg(pc);
+                       if (!opt_input_format) {
+                               ret = -EINVAL;
+                               goto end;
+                       }
+                       break;
+               case OPT_OUTPUT_FORMAT:
+                       opt_output_format = (char *) poptGetOptArg(pc);
+                       if (!opt_output_format) {
+                               ret = -EINVAL;
+                               goto end;
+                       }
+                       break;
                case OPT_HELP:
                        usage(stdout);
                        ret = 1;        /* exit cleanly */
@@ -248,14 +354,15 @@ static int parse_options(int argc, char **argv)
                case OPT_NO_DELTA:
                        opt_delta_field = 0;
                        break;
-               case OPT_CLOCK_RAW:
-                       opt_clock_raw = 1;
+               case OPT_CLOCK_CYCLES:
+                       opt_clock_cycles = 1;
                        break;
                case OPT_CLOCK_OFFSET:
                {
-                       char *str, *endptr;
+                       char *str;
+                       char *endptr;
 
-                       str = poptGetOptArg(pc);
+                       str = (char *) poptGetOptArg(pc);
                        if (!str) {
                                fprintf(stderr, "[error] Missing --clock-offset argument\n");
                                ret = -EINVAL;
@@ -266,13 +373,38 @@ static int parse_options(int argc, char **argv)
                        if (*endptr != '\0' || str == endptr || errno != 0) {
                                fprintf(stderr, "[error] Incorrect --clock-offset argument: %s\n", str);
                                ret = -EINVAL;
+                               free(str);
                                goto end;
                        }
+                       free(str);
                        break;
                }
                case OPT_CLOCK_SECONDS:
                        opt_clock_seconds = 1;
                        break;
+               case OPT_CLOCK_OFFSET_NS:
+               {
+                       char *str;
+                       char *endptr;
+
+                       str = (char *) poptGetOptArg(pc);
+                       if (!str) {
+                               fprintf(stderr, "[error] Missing --clock-offset-ns argument\n");
+                               ret = -EINVAL;
+                               goto end;
+                       }
+                       errno = 0;
+                       opt_clock_offset_ns = strtoull(str, &endptr, 0);
+                       if (*endptr != '\0' || str == endptr || errno != 0) {
+                               fprintf(stderr, "[error] Incorrect --clock-offset-ns argument: %s\n", str);
+                               ret = -EINVAL;
+                               free(str);
+                               goto end;
+                       }
+                       free(str);
+                       break;
+               }
+
                case OPT_CLOCK_DATE:
                        opt_clock_date = 1;
                        break;
@@ -282,19 +414,41 @@ static int parse_options(int argc, char **argv)
                case OPT_CLOCK_FORCE_CORRELATE:
                        opt_clock_force_correlate = 1;
                        break;
-
+               case OPT_STREAM_INTERSECTION:
+                       opt_stream_intersection = 1;
+                       break;
+               case OPT_DEBUG_INFO_DIR:
+                       opt_debug_info_dir = (char *) poptGetOptArg(pc);
+                       if (!opt_debug_info_dir) {
+                               ret = -EINVAL;
+                               goto end;
+                       }
+                       break;
+               case OPT_DEBUG_INFO_FULL_PATH:
+                       opt_debug_info_full_path = 1;
+                       break;
+               case OPT_DEBUG_INFO_TARGET_PREFIX:
+                       opt_debug_info_target_prefix = (char *) poptGetOptArg(pc);
+                       if (!opt_debug_info_target_prefix) {
+                               ret = -EINVAL;
+                               goto end;
+                       }
+                       break;
                default:
                        ret = -EINVAL;
                        goto end;
                }
        }
 
-       opt_input_path = poptGetArg(pc);
-       if (!opt_input_path) {
+       do {
+               ipath = poptGetArg(pc);
+               if (ipath)
+                       g_ptr_array_add(opt_input_paths, (gpointer) ipath);
+       } while (ipath);
+       if (opt_input_paths->len == 0) {
                ret = -EINVAL;
                goto end;
        }
-       opt_output_path = poptGetArg(pc);
 
 end:
        if (pc) {
@@ -303,6 +457,67 @@ end:
        return ret;
 }
 
+static GPtrArray *traversed_paths = 0;
+
+/*
+ * traverse_trace_dir() is the callback function for File Tree Walk (nftw).
+ * it receives the path of the current entry (file, dir, link..etc) with
+ * a flag to indicate the type of the entry.
+ * if the entry being visited is a directory and contains a metadata file,
+ * then add the path to a global list to be processed later in
+ * add_traces_recursive.
+ */
+static int traverse_trace_dir(const char *fpath, const struct stat *sb,
+                       int tflag, struct FTW *ftwbuf)
+{
+       int dirfd, metafd;
+       int closeret;
+
+       if (tflag != FTW_D)
+               return 0;
+
+       dirfd = open(fpath, 0);
+       if (dirfd < 0) {
+               fprintf(stderr, "[error] [Context] Unable to open trace "
+                       "directory file descriptor.\n");
+               return 0;       /* partial error */
+       }
+       metafd = openat(dirfd, "metadata", O_RDONLY);
+       if (metafd < 0) {
+               closeret = close(dirfd);
+               if (closeret < 0) {
+                       perror("close");
+                       return -1;
+               }
+               /* No meta data, just return */
+               return 0;
+       } else {
+               int err_close = 0;
+
+               closeret = close(metafd);
+               if (closeret < 0) {
+                       perror("close");
+                       err_close = 1;
+               }
+               closeret = close(dirfd);
+               if (closeret < 0) {
+                       perror("close");
+                       err_close = 1;
+               }
+               if (err_close) {
+                       return -1;
+               }
+
+               /* Add path to the global list */
+               if (traversed_paths == NULL) {
+                       fprintf(stderr, "[error] [Context] Invalid open path array.\n");        
+                       return -1;
+               }
+               g_ptr_array_add(traversed_paths, g_string_new(fpath));
+       }
+
+       return 0;
+}
 
 /*
  * bt_context_add_traces_recursive: Open a trace recursively
@@ -311,143 +526,201 @@ end:
  * path, and add them to the context. The packet_seek parameter can be
  * NULL: this specify to use the default format packet_seek.
  *
- * Return: 0 on success, nonzero on failure.
+ * Return: 0 on success, < 0 on failure, > 0 on partial failure.
  * Unable to open toplevel: failure.
- * Unable to open some subdirectory or file: warn and continue;
+ * Unable to open some subdirectory or file: warn and continue (partial
+ * failure);
  */
 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
                const char *format_str,
-               void (*packet_seek)(struct stream_pos *pos,
+               void (*packet_seek)(struct bt_stream_pos *pos,
                        size_t offset, int whence))
 {
-       FTS *tree;
-       FTSENT *node;
-       GArray *trace_ids;
-       char lpath[PATH_MAX];
-       char * const paths[2] = { lpath, NULL };
-       int ret;
+       int ret = 0, trace_ids = 0;
+
+       if ((strncmp(path, NET4_URL_PREFIX, sizeof(NET4_URL_PREFIX) - 1)) == 0 ||
+                       (strncmp(path, NET6_URL_PREFIX, sizeof(NET6_URL_PREFIX) - 1)) == 0 ||
+                       (strncmp(path, NET_URL_PREFIX, sizeof(NET_URL_PREFIX) - 1)) == 0) {
+               ret = bt_context_add_trace(ctx,
+                               path, format_str, packet_seek, NULL, NULL);
+               if (ret < 0) {
+                       fprintf(stderr, "[warning] [Context] cannot open trace \"%s\" "
+                                       "for reading.\n", path);
+               }
+               return ret;
+       }
+       /* Should lock traversed_paths mutex here if used in multithread */
+
+       traversed_paths = g_ptr_array_new();
+       ret = nftw(path, traverse_trace_dir, 10, 0);
+
+       /* Process the array if ntfw did not return a fatal error */
+       if (ret >= 0) {
+               int i;
+
+               for (i = 0; i < traversed_paths->len; i++) {
+                       GString *trace_path = g_ptr_array_index(traversed_paths,
+                                                               i);
+                       int trace_id = bt_context_add_trace(ctx,
+                                                           trace_path->str,
+                                                           format_str,
+                                                           packet_seek,
+                                                           NULL,
+                                                           NULL);
+                       if (trace_id < 0) {
+                               fprintf(stderr, "[warning] [Context] cannot open trace \"%s\" from %s "
+                                       "for reading.\n", trace_path->str, path);
+                               /* Allow to skip erroneous traces. */
+                               ret = 1;        /* partial error */
+                       } else {
+                               trace_ids++;
+                       }
+                       g_string_free(trace_path, TRUE);
+               }
+       }
+
+       g_ptr_array_free(traversed_paths, TRUE);
+       traversed_paths = NULL;
+
+       /* Should unlock traversed paths mutex here if used in multithread */
 
        /*
-        * Need to copy path, because fts_open can change it.
-        * It is the pointer array, not the strings, that are constant.
+        * Return an error if no trace can be opened.
         */
-       strncpy(lpath, path, PATH_MAX);
-       lpath[PATH_MAX - 1] = '\0';
-
-       tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
-       if (tree == NULL) {
-               fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
-                               path);
-               return -EINVAL;
+       if (trace_ids == 0) {
+               fprintf(stderr, "[error] Cannot open any trace for reading.\n\n");
+               ret = -ENOENT;          /* failure */
        }
+       return ret;
+}
 
-       trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
-
-       while ((node = fts_read(tree))) {
-               int dirfd, metafd;
+static
+int trace_pre_handler(struct bt_trace_descriptor *td_write,
+                 struct bt_context *ctx)
+{
+       struct ctf_text_stream_pos *sout;
+       struct trace_collection *tc;
+       int ret, i;
 
-               if (!(node->fts_info & FTS_D))
-                       continue;
+       sout = container_of(td_write, struct ctf_text_stream_pos,
+                       trace_descriptor);
 
-               dirfd = open(node->fts_accpath, 0);
-               if (dirfd < 0) {
-                       fprintf(stderr, "[error] [Context] Unable to open trace "
-                               "directory file descriptor.\n");
-                       ret = dirfd;
-                       goto error;
-               }
-               metafd = openat(dirfd, "metadata", O_RDONLY);
-               if (metafd < 0) {
-                       ret = close(dirfd);
-                       if (ret < 0) {
-                               perror("close");
-                               goto error;
-                       }
-               } else {
-                       int trace_id;
+       if (!sout->parent.pre_trace_cb)
+               return 0;
 
-                       ret = close(metafd);
-                       if (ret < 0) {
-                               perror("close");
-                               goto error;
-                       }
-                       ret = close(dirfd);
-                       if (ret < 0) {
-                               perror("close");
-                               goto error;
-                       }
+       tc = ctx->tc;
+       for (i = 0; i < tc->array->len; i++) {
+               struct bt_trace_descriptor *td =
+                       g_ptr_array_index(tc->array, i);
 
-                       trace_id = bt_context_add_trace(ctx,
-                               node->fts_accpath, format_str,
-                               packet_seek, NULL, NULL);
-                       if (trace_id < 0) {
-                               fprintf(stderr, "[error] [Context] opening trace \"%s\" from %s "
-                                       "for reading.\n", node->fts_accpath, path);
-                               ret = trace_id;
-                               goto error;
-                       }
-                       g_array_append_val(trace_ids, trace_id);
+               ret = sout->parent.pre_trace_cb(&sout->parent, td);
+               if (ret) {
+                       fprintf(stderr, "[error] Writing to trace pre handler failed.\n");
+                       goto end;
                }
        }
-
-       g_array_free(trace_ids, TRUE);
-       return 0;
-
-error:
+       ret = 0;
+end:
        return ret;
 }
 
+static
+int trace_post_handler(struct bt_trace_descriptor *td_write,
+                 struct bt_context *ctx)
+{
+       struct ctf_text_stream_pos *sout;
+       struct trace_collection *tc;
+       int ret, i;
+
+       sout = container_of(td_write, struct ctf_text_stream_pos,
+                       trace_descriptor);
+
+       if (!sout->parent.post_trace_cb)
+               return 0;
 
+       tc = ctx->tc;
+       for (i = 0; i < tc->array->len; i++) {
+               struct bt_trace_descriptor *td =
+                       g_ptr_array_index(tc->array, i);
 
-int convert_trace(struct trace_descriptor *td_write,
+               ret = sout->parent.post_trace_cb(&sout->parent, td);
+               if (ret) {
+                       fprintf(stderr, "[error] Writing to trace post handler failed.\n");
+                       goto end;
+               }
+       }
+       ret = 0;
+end:
+       return ret;
+}
+
+static
+int convert_trace(struct bt_trace_descriptor *td_write,
                  struct bt_context *ctx)
 {
        struct bt_ctf_iter *iter;
        struct ctf_text_stream_pos *sout;
-       struct bt_iter_pos begin_pos;
+       struct bt_iter_pos *begin_pos = NULL, *end_pos = NULL;
        struct bt_ctf_event *ctf_event;
        int ret;
 
        sout = container_of(td_write, struct ctf_text_stream_pos,
                        trace_descriptor);
 
-       begin_pos.type = BT_SEEK_BEGIN;
-       iter = bt_ctf_iter_create(ctx, &begin_pos, NULL);
+       if (!sout->parent.event_cb) {
+               return 0;
+       }
+
+       if (opt_stream_intersection) {
+               iter = bt_ctf_iter_create_intersect(ctx, &begin_pos, &end_pos);
+       } else {
+               begin_pos = bt_iter_create_time_pos(NULL, 0);
+               begin_pos->type = BT_SEEK_BEGIN;
+               iter = bt_ctf_iter_create(ctx, begin_pos, NULL);
+       }
        if (!iter) {
                ret = -1;
                goto error_iter;
        }
        while ((ctf_event = bt_ctf_iter_read_event(iter))) {
-               ret = sout->parent.event_cb(&sout->parent, ctf_event->stream);
+               ret = sout->parent.event_cb(&sout->parent, ctf_event->parent->stream);
                if (ret) {
                        fprintf(stderr, "[error] Writing event failed.\n");
                        goto end;
                }
                ret = bt_iter_next(bt_ctf_get_iter(iter));
-               if (ret < 0)
+               if (ret < 0) {
                        goto end;
+               }
        }
        ret = 0;
 
 end:
        bt_ctf_iter_destroy(iter);
 error_iter:
+       bt_iter_free_pos(begin_pos);
+       bt_iter_free_pos(end_pos);
        return ret;
 }
 
 int main(int argc, char **argv)
 {
-       int ret;
-       struct format *fmt_write;
-       struct trace_descriptor *td_write;
+       int ret, partial_error = 0, open_success = 0;
+       struct bt_format *fmt_write;
+       struct bt_trace_descriptor *td_write;
        struct bt_context *ctx;
+       int i;
+
+       opt_input_paths = g_ptr_array_new();
 
        ret = parse_options(argc, argv);
        if (ret < 0) {
                fprintf(stderr, "Error parsing options.\n\n");
                usage(stderr);
+               g_ptr_array_free(opt_input_paths, TRUE);
                exit(EXIT_FAILURE);
        } else if (ret > 0) {
+               g_ptr_array_free(opt_input_paths, TRUE);
                exit(EXIT_SUCCESS);
        }
        printf_verbose("Verbose mode active.\n");
@@ -458,38 +731,70 @@ int main(int argc, char **argv)
        if (opt_output_format)
                strlower(opt_output_format);
 
-       printf_verbose("Converting from directory: %s\n", opt_input_path);
+       printf_verbose("Converting from directory(ies):\n");
+       for (i = 0; i < opt_input_paths->len; i++) {
+               const char *ipath = g_ptr_array_index(opt_input_paths, i);
+               printf_verbose("    %s\n", ipath);
+       }
        printf_verbose("Converting from format: %s\n",
                opt_input_format ? : "ctf <default>");
-       printf_verbose("Converting to directory: %s\n",
+       printf_verbose("Converting to target: %s\n",
                opt_output_path ? : "<stdout>");
        printf_verbose("Converting to format: %s\n",
                opt_output_format ? : "text <default>");
 
-       if (!opt_input_format)
-               opt_input_format = "ctf";
-       if (!opt_output_format)
-               opt_output_format = "text";
+       if (!opt_input_format) {
+               opt_input_format = strdup("ctf");
+               if (!opt_input_format) {
+                       partial_error = 1;
+                       goto end;
+               }
+       }
+       if (!opt_output_format) {
+               opt_output_format = strdup("text");
+               if (!opt_output_format) {
+                       partial_error = 1;
+                       goto end;
+               }
+       }
        fmt_read = bt_lookup_format(g_quark_from_static_string(opt_input_format));
        if (!fmt_read) {
                fprintf(stderr, "[error] Format \"%s\" is not supported.\n\n",
                        opt_input_format);
-               exit(EXIT_FAILURE);
+               partial_error = 1;
+               goto end;
        }
        fmt_write = bt_lookup_format(g_quark_from_static_string(opt_output_format));
        if (!fmt_write) {
                fprintf(stderr, "[error] format \"%s\" is not supported.\n\n",
                        opt_output_format);
-               exit(EXIT_FAILURE);
+               partial_error = 1;
+               goto end;
        }
 
        ctx = bt_context_create();
+       if (!ctx) {
+               goto error_td_read;
+       }
 
-       ret = bt_context_add_traces_recursive(ctx, opt_input_path,
-                       opt_input_format, NULL);
-       if (ret) {
-               fprintf(stderr, "[error] opening trace \"%s\" for reading.\n\n",
-                       opt_input_path);
+       for (i = 0; i < opt_input_paths->len; i++) {
+               const char *ipath = g_ptr_array_index(opt_input_paths, i);
+               ret = bt_context_add_traces_recursive(ctx, ipath,
+                               opt_input_format, NULL);
+               if (ret < 0) {
+                       fprintf(stderr, "[error] opening trace \"%s\" for reading.\n\n",
+                               ipath);
+               } else if (ret > 0) {
+                       fprintf(stderr, "[warning] errors occurred when opening trace \"%s\" for reading, continuing anyway.\n\n",
+                               ipath);
+                       open_success = 1;       /* some traces were OK */
+                       partial_error = 1;
+               } else {
+                       open_success = 1;       /* all traces were OK */
+               }
+       }
+       if (!open_success) {
+               fprintf(stderr, "[error] none of the specified trace paths could be opened.\n\n");
                goto error_td_read;
        }
 
@@ -500,9 +805,31 @@ int main(int argc, char **argv)
                goto error_td_write;
        }
 
-       ret = convert_trace(td_write, ctx);
+       /*
+        * Errors happened when opening traces, but we continue anyway.
+        * sleep to let user see the stderr output before stdout.
+        */
+       if (partial_error)
+               sleep(PARTIAL_ERROR_SLEEP);
+
+       ret = trace_pre_handler(td_write, ctx);
+       if (ret) {
+               fprintf(stderr, "Error in trace pre handle.\n\n");
+               goto error_copy_trace;
+       }
+
+       /* For now, we support only CTF iterators */
+       if (fmt_read->name == g_quark_from_static_string("ctf")) {
+               ret = convert_trace(td_write, ctx);
+               if (ret) {
+                       fprintf(stderr, "Error printing trace.\n\n");
+                       goto error_copy_trace;
+               }
+       }
+
+       ret = trace_post_handler(td_write, ctx);
        if (ret) {
-               fprintf(stderr, "Error printing trace.\n\n");
+               fprintf(stderr, "Error in trace post handle.\n\n");
                goto error_copy_trace;
        }
 
@@ -511,7 +838,7 @@ int main(int argc, char **argv)
        bt_context_put(ctx);
        printf_verbose("finished converting. Output written to:\n%s\n",
                        opt_output_path ? : "<stdout>");
-       exit(EXIT_SUCCESS);
+       goto end;
 
        /* Error handling */
 error_copy_trace:
@@ -519,5 +846,18 @@ error_copy_trace:
 error_td_write:
        bt_context_put(ctx);
 error_td_read:
-       exit(EXIT_FAILURE);
+       partial_error = 1;
+
+       /* teardown and exit */
+end:
+       free(opt_input_format);
+       free(opt_output_format);
+       free(opt_output_path);
+       free(opt_debug_info_dir);
+       free(opt_debug_info_target_prefix);
+       g_ptr_array_free(opt_input_paths, TRUE);
+       if (partial_error)
+               exit(EXIT_FAILURE);
+       else
+               exit(EXIT_SUCCESS);
 }
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