When debugging stuff that occurs over several forks it would be useful
not to keep overwriting the one logfile you've set-up. This allows a
simple %d to be included once in the logfile parameter which is
substituted with getpid().
Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
Reviewed-by: Leandro Dorileo <l...@dorileo.org>
Reviewed-by: Aurelien Jarno <aurel...@aurel32.net>
---
v5
- add another r-b
---
qemu-log.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/qemu-log.c b/qemu-log.c
index 8c59063..2eebac0 100644
--- a/qemu-log.c
+++ b/qemu-log.c
@@ -70,11 +70,24 @@ void do_qemu_set_log(int log_flags, bool use_own_buffers)
qemu_log_close();
}
}
-
+/*
+ * Allow the user to include %d in their logfile which will be
+ * substituted with the current PID. This is useful for debugging many
+ * nested linux-user tasks but will result in lots of logs.
+ */
void qemu_set_log_filename(const char *filename)
{
g_free(logfilename);
- logfilename = g_strdup(filename);
+ if (g_strrstr(filename, "%d")) {
+ /* if we are going to format this we'd better validate first */
+ if (g_regex_match_simple("^[^%]+%d[^%]+$", filename, 0, 0)) {
+ logfilename = g_strdup_printf(filename, getpid());
+ } else {
+ g_error("Bad logfile format: %s", filename);
+ }
+ } else {
+ logfilename = g_strdup(filename);
+ }
qemu_log_close();
qemu_set_log(qemu_loglevel);
}
--
2.7.0
