[Qemu-devel] [PATCH v4 10/11] vl.c: log system invocation when enabled

["Alex Bennée" <alex.bennee@linaro.org>]

This makes it a little easier to remember how you generated that 100Mb
trace log you saved for a future date.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 configure |  2 +-
 vl.c      | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 704b34c..9cc6a48 100755
--- a/configure
+++ b/configure
@@ -1445,7 +1445,7 @@ else
 fi
 
 gcc_flags="-Wold-style-declaration -Wold-style-definition -Wtype-limits"
-gcc_flags="-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers $gcc_flags"
+gcc_flags="-Wformat-security -Wno-format-y2k -Winit-self -Wignored-qualifiers $gcc_flags"
 gcc_flags="-Wmissing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
 gcc_flags="-Wendif-labels $gcc_flags"
 gcc_flags="-Wno-initializer-overrides $gcc_flags"
diff --git a/vl.c b/vl.c
index 05211cf..6f0ae74 100644
--- a/vl.c
+++ b/vl.c
@@ -4094,12 +4094,30 @@ int main(int argc, char **argv, char **envp)
 
     if (log_mask) {
         int mask;
+        char fmt_time[512];
+        time_t start_time = time(NULL);
+        struct tm *local_start = localtime(&start_time);
+
+
+        if (log_file) {
+            qemu_set_log_filename(log_file);
+        }
+
         mask = qemu_str_to_log_mask(log_mask);
         if (!mask) {
             qemu_print_log_usage(stdout);
             exit(1);
         }
         qemu_set_log(mask);
+
+        if (strftime(fmt_time, sizeof(fmt_time), "%c", local_start) > 0) {
+            qemu_log("System Emulation started at %s\n", fmt_time);
+            qemu_log("Invocation:");
+            for (i = 0; i < argc; i++) {
+                qemu_log("%s ", argv[i]);
+            }
+            qemu_log("\n");
+        }
     }
 
     if (!is_daemonized()) {
-- 
2.5.0