[Qemu-devel] [PATCH 2/2] net: store guest timestamp in dump file instead of time since guest startup

[Hervé Poussineau]

Stored dates are no more 1970-01-01 (+ run time), but have a real meaning.
If someone wants to have comparable timestamps accross boots, it is
possible to start qemu with -rtc to give the startup date.

Signed-off-by: Hervé Poussineau <address@hidden>
---
 net/dump.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/net/dump.c b/net/dump.c
index 8132411..4b48d48 100644
--- a/net/dump.c
+++ b/net/dump.c
@@ -30,6 +30,7 @@
 
 typedef struct DumpState {
     VLANClientState nc;
+    int64_t start_ts;
     int fd;
     int pcap_caplen;
 } DumpState;
@@ -70,7 +71,7 @@ static ssize_t dump_receive(VLANClientState *nc, const 
uint8_t *buf, size_t size
     ts = muldiv64(qemu_get_clock_ns(vm_clock), 1000000, get_ticks_per_sec());
     caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
 
-    hdr.ts.tv_sec = ts / 1000000;
+    hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
     hdr.ts.tv_usec = ts % 1000000;
     hdr.caplen = caplen;
     hdr.len = size;
@@ -104,6 +105,7 @@ static int net_dump_init(VLANState *vlan, const char 
*device,
     struct pcap_file_hdr hdr;
     VLANClientState *nc;
     DumpState *s;
+    struct tm tm;
     int fd;
 
     fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
@@ -136,6 +138,9 @@ static int net_dump_init(VLANState *vlan, const char 
*device,
     s->fd = fd;
     s->pcap_caplen = len;
 
+    qemu_get_timedate(&tm, 0);
+    s->start_ts = mktime(&tm);
+
     return 0;
 }
 
-- 
1.7.6.3