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[Qemu-devel] [PATCH v4 06/11] qemu-log: support simple pid substitution
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PATCH v4 06/11] qemu-log: support simple pid substitution in logfile |
Date: |
Mon, 3 Aug 2015 10:14:46 +0100 |
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 <address@hidden>
Reviewed-by: Leandro Dorileo <address@hidden>
---
qemu-log.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/qemu-log.c b/qemu-log.c
index 7036076..77ed7bc 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);
}
--
2.5.0
- Re: [Qemu-devel] [PATCH v4 01/11] tcg: add ability to dump /tmp/perf-<pid>.map files, (continued)
Re: [Qemu-devel] [PATCH v4 01/11] tcg: add ability to dump /tmp/perf-<pid>.map files, Aurelien Jarno, 2015/08/04
[Qemu-devel] [PATCH v4 08/11] qemu-log: dfilter-ise exec, out_asm, and op_opt, Alex Bennée, 2015/08/03
[Qemu-devel] [PATCH v4 05/11] qemu-log: Improve the "exec" TB execution logging, Alex Bennée, 2015/08/03
[Qemu-devel] [PATCH v4 11/11] cputlb: modernise the debug support, Alex Bennée, 2015/08/03
[Qemu-devel] [PATCH v4 06/11] qemu-log: support simple pid substitution in logfile,
Alex Bennée <=
[Qemu-devel] [PATCH v4 10/11] vl.c: log system invocation when enabled, Alex Bennée, 2015/08/03
[Qemu-devel] [PATCH v4 09/11] target-arm: dfilter support for in_asm, op, opt_op, Alex Bennée, 2015/08/03