slirp: introduce SLIRP_DEBUG environment variable

Learn to read SLIRP_DEBUG=call,misc,error (all or help also handled)
to set the slirp_debug flags.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

2 files changed, 15 insertions, 8 deletions

diff --git a/slirp/misc.c b/slirp/misc.c
index e30d2ceb2a..a0f104be5e 100644
--- a/slirp/misc.c
+++ b/slirp/misc.c
@@ -11,14 +11,6 @@
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"
 
-#ifdef DEBUG
-#define SLIRP_DEBUG (DBG_CALL | DBG_MISC | DBG_ERROR)
-#else
-#define SLIRP_DEBUG 0
-#endif
-
-int slirp_debug = SLIRP_DEBUG;
-
 inline void
 insque(void *a, void *b)
 {
diff --git a/slirp/slirp.c b/slirp/slirp.c
index ce5f571d0f..0b70cb9fb6 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -35,6 +35,8 @@
 #include <net/if.h>
 #endif
 
+int slirp_debug;
+
 /* Define to 1 if you want KEEPALIVE timers */
 bool slirp_do_keepalive;
 
@@ -250,6 +252,7 @@ int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
 static void slirp_init_once(void)
 {
     static int initialized;
+    const char *debug;
 #ifdef _WIN32
     WSADATA Data;
 #endif
@@ -266,6 +269,18 @@ static void slirp_init_once(void)
 
     loopback_addr.s_addr = htonl(INADDR_LOOPBACK);
     loopback_mask = htonl(IN_CLASSA_NET);
+
+    debug = g_getenv("SLIRP_DEBUG");
+    if (debug) {
+        const GDebugKey keys[] = {
+            { "call", DBG_CALL },
+            { "misc", DBG_MISC },
+            { "error", DBG_ERROR },
+        };
+        slirp_debug = g_parse_debug_string(debug, keys, G_N_ELEMENTS(keys));
+    }
+
+
 }
 
 static void slirp_state_save(QEMUFile *f, void *opaque);