[Qemu-devel] [PATCH 3/9] trace: split trace_init_file out of trace_init_backends

[Paolo Bonzini <pbonzini@redhat.com>]

This is cleaner, and improves error reporting with -daemonize.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 trace/control.c | 17 ++++++++++++-----
 trace/control.h | 13 ++++++++++++-
 trace/simple.c  |  6 ++----
 trace/simple.h  |  4 ++--
 vl.c            | 13 +++++++++----
 5 files changed, 37 insertions(+), 16 deletions(-)

diff --git a/trace/control.c b/trace/control.c
index ee5fbca..3e33d03 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -142,17 +142,24 @@ void trace_init_events(const char *fname)
     loc_pop(&loc);
 }
 
-bool trace_init_backends(const char *file)
+void trace_init_file(const char *file)
 {
 #ifdef CONFIG_TRACE_SIMPLE
-    if (!st_init(file)) {
-        fprintf(stderr, "failed to initialize simple tracing backend.\n");
-        return false;
-    }
+    st_set_trace_file(file);
 #else
     if (file) {
         fprintf(stderr, "error: -trace file=...: "
                 "option not supported by the selected tracing backends\n");
+        exit(1);
+    }
+#endif
+}
+
+bool trace_init_backends(void)
+{
+#ifdef CONFIG_TRACE_SIMPLE
+    if (!st_init()) {
+        fprintf(stderr, "failed to initialize simple tracing backend.\n");
         return false;
     }
 #endif
diff --git a/trace/control.h b/trace/control.h
index bfbe560..d2506d4 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -157,7 +157,7 @@ static void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
  *
  * Returns: Whether the backends could be successfully initialized.
  */
-bool trace_init_backends(const char *file);
+bool trace_init_backends(void);
 
 /**
  * trace_init_events:
@@ -170,6 +170,17 @@ bool trace_init_backends(const char *file);
  */
 void trace_init_events(const char *file);
 
+/**
+ * trace_init_file:
+ * @file:   Name of trace output file; may be NULL.
+ *          Corresponds to commandline option "-trace file=...".
+ *
+ * Record the name of the output file for the tracing backend.
+ * Exits if no selected backend does not support specifying the
+ * output file, and a non-NULL file was passed.
+ */
+void trace_init_file(const char *file);
+
 
 #include "trace/control-internal.h"
 
diff --git a/trace/simple.c b/trace/simple.c
index 11ad030..a4bc705 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -322,7 +322,7 @@ void st_set_trace_file_enabled(bool enable)
  * @file        The trace file name or NULL for the default name-<pid> set at
  *              config time
  */
-bool st_set_trace_file(const char *file)
+void st_set_trace_file(const char *file)
 {
     st_set_trace_file_enabled(false);
 
@@ -335,7 +335,6 @@ bool st_set_trace_file(const char *file)
     }
 
     st_set_trace_file_enabled(true);
-    return true;
 }
 
 void st_print_trace_file_status(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
@@ -373,7 +372,7 @@ static GThread *trace_thread_create(GThreadFunc fn)
     return thread;
 }
 
-bool st_init(const char *file)
+bool st_init(void)
 {
     GThread *thread;
 
@@ -386,6 +385,5 @@ bool st_init(const char *file)
     }
 
     atexit(st_flush_trace_buffer);
-    st_set_trace_file(file);
     return true;
 }
diff --git a/trace/simple.h b/trace/simple.h
index 6997996..8d1a32e 100644
--- a/trace/simple.h
+++ b/trace/simple.h
@@ -20,8 +20,8 @@
 
 void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
 void st_set_trace_file_enabled(bool enable);
-bool st_set_trace_file(const char *file);
-bool st_init(const char *file);
+void st_set_trace_file(const char *file);
+bool st_init(void);
 void st_flush_trace_buffer(void);
 
 typedef struct {
diff --git a/vl.c b/vl.c
index ba29fef..b1ddd3f 100644
--- a/vl.c
+++ b/vl.c
@@ -2956,7 +2956,7 @@ int main(int argc, char **argv, char **envp)
     bool userconfig = true;
     const char *log_mask = NULL;
     const char *log_file = NULL;
-    const char *trace_file = NULL;
+    char *trace_file = NULL;
     ram_addr_t maxram_size;
     uint64_t ram_slots = 0;
     FILE *vmstate_dump_file = NULL;
@@ -3881,7 +3881,10 @@ int main(int argc, char **argv, char **envp)
                     exit(1);
                 }
                 trace_init_events(qemu_opt_get(opts, "events"));
-                trace_file = qemu_opt_get(opts, "file");
+                if (trace_file) {
+                    g_free(trace_file);
+                }
+                trace_file = g_strdup(qemu_opt_get(opts, "file"));
                 qemu_opts_del(opts);
                 break;
             }
@@ -4062,6 +4065,8 @@ int main(int argc, char **argv, char **envp)
         exit(0);
     }
 
+    trace_init_file(trace_file);
+
     /* Open the logfile at this point and set the log mask if necessary.
      */
     if (log_file) {
@@ -4079,7 +4084,7 @@ int main(int argc, char **argv, char **envp)
     }
 
     if (!is_daemonized()) {
-        if (!trace_init_backends(trace_file)) {
+        if (!trace_init_backends()) {
             exit(1);
         }
     }
@@ -4631,7 +4636,7 @@ int main(int argc, char **argv, char **envp)
     os_setup_post();
 
     if (is_daemonized()) {
-        if (!trace_init_backends(trace_file)) {
+        if (!trace_init_backends()) {
             exit(1);
         }
     }
-- 
2.5.0