X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fsave.c;h=0a1393a4bd90267bb9d5d041af3f6b40e007595b;hp=d6316ef971145211afcf74cee0bc2d7527c5e19c;hb=847a5916c26ab9cc0dfc9322cccd2c748c54747e;hpb=e83a8bdbfb6a9542f40d62ead334f249baf05255

diff --git a/src/bin/lttng-sessiond/save.c b/src/bin/lttng-sessiond/save.c
index d6316ef97..0a1393a4b 100644
--- a/src/bin/lttng-sessiond/save.c
+++ b/src/bin/lttng-sessiond/save.c
@@ -30,6 +30,7 @@
 #include <common/runas.h>
 #include <lttng/save-internal.h>
 
+#include "kernel.h"
 #include "save.h"
 #include "session.h"
 #include "syscall.h"
@@ -722,8 +723,6 @@ end:
 	return ret;
 }
 
-/* TODO: save/restore tracker pid */
-
 static
 int save_kernel_context(struct config_writer *writer,
 	struct lttng_kernel_context *ctx)
@@ -1192,6 +1191,99 @@ end:
 	return ret;
 }
 
+static
+int save_pid_tracker(struct config_writer *writer,
+	struct ltt_session *sess, int domain)
+{
+	int ret = 0;
+	ssize_t nr_pids = 0, i;
+	int32_t *pids = NULL;
+
+	switch (domain) {
+	case LTTNG_DOMAIN_KERNEL:
+	{
+		nr_pids = kernel_list_tracker_pids(sess->kernel_session, &pids);
+		if (nr_pids < 0) {
+			ret = LTTNG_ERR_KERN_LIST_FAIL;
+			goto end;
+		}
+		break;
+	}
+	case LTTNG_DOMAIN_UST:
+	{
+		nr_pids = trace_ust_list_tracker_pids(sess->ust_session, &pids);
+		if (nr_pids < 0) {
+			ret = LTTNG_ERR_UST_LIST_FAIL;
+			goto end;
+		}
+		break;
+	}
+	case LTTNG_DOMAIN_JUL:
+	case LTTNG_DOMAIN_LOG4J:
+	case LTTNG_DOMAIN_PYTHON:
+	default:
+		ret = LTTNG_ERR_UNKNOWN_DOMAIN;
+		goto end;
+	}
+
+	/* Only create a pid_tracker if enabled or untrack all */
+	if (nr_pids != 1 || (nr_pids == 1 && pids[0] != -1)) {
+		ret = config_writer_open_element(writer,
+				config_element_pid_tracker);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
+
+		ret = config_writer_open_element(writer,
+				config_element_targets);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
+
+		for (i = 0; i < nr_pids; i++) {
+			ret = config_writer_open_element(writer,
+					config_element_target_pid);
+			if (ret) {
+				ret = LTTNG_ERR_SAVE_IO_FAIL;
+				goto end;
+			}
+
+			ret = config_writer_write_element_unsigned_int(writer,
+					config_element_pid, pids[i]);
+			if (ret) {
+				ret = LTTNG_ERR_SAVE_IO_FAIL;
+				goto end;
+			}
+
+			/* /pid_target */
+			ret = config_writer_close_element(writer);
+			if (ret) {
+				ret = LTTNG_ERR_SAVE_IO_FAIL;
+				goto end;
+			}
+		}
+
+		/* /targets */
+		ret = config_writer_close_element(writer);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
+
+		/* /pid_tracker */
+		ret = config_writer_close_element(writer);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
+	}
+end:
+	free(pids);
+	return ret;
+}
+
 static
 int save_domains(struct config_writer *writer, struct ltt_session *session)
 {
@@ -1224,6 +1316,24 @@ int save_domains(struct config_writer *writer, struct ltt_session *session)
 			goto end;
 		}
 
+		ret = config_writer_open_element(writer,
+			config_element_trackers);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
+
+		ret = save_pid_tracker(writer, session, LTTNG_DOMAIN_KERNEL);
+		if (ret) {
+			goto end;
+		}
+
+		/* /trackers */
+		ret = config_writer_close_element(writer);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
 		/* /domain */
 		ret = config_writer_close_element(writer);
 		if (ret) {
@@ -1247,6 +1357,24 @@ int save_domains(struct config_writer *writer, struct ltt_session *session)
 			goto end;
 		}
 
+		ret = config_writer_open_element(writer,
+			config_element_trackers);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
+
+		ret = save_pid_tracker(writer, session, LTTNG_DOMAIN_UST);
+		if (ret) {
+			goto end;
+		}
+
+		/* /trackers */
+		ret = config_writer_close_element(writer);
+		if (ret) {
+			ret = LTTNG_ERR_SAVE_IO_FAIL;
+			goto end;
+		}
 		/* /domain */
 		ret = config_writer_close_element(writer);
 		if (ret) {