1 files changed, 15 insertions, 0 deletions

diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index 211e1e2..05f5ecf 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -111,6 +111,7 @@ static void PrintUsage()
     printf("  /help, -help, --help, /?\n");
     printf("  /datadir=PATH\n");
     printf("  /debug\n");
+    printf("  /maxdebugfilesize=N        (roll debug.log at N MB, default 1024; 0 = never)\n");
     printf("  /gen\n");
     printf("  /nogui or /daemon\n");
     printf("  /selftest=wallet-keypool, wallet-hd, wallet-format, wallet-crypto, wallet-encrypt,\n");
@@ -191,6 +192,20 @@ static void ParseStartupArguments(int argc, char* argv[])
     if (arg(argc,argv,"/debug") || arg(argc,argv,"-debug"))
         fDebug = true;
 
+    // /maxdebugfilesize=N -- roll debug.log to debug.log.old once it passes
+    // N MB, checked on each write. Default is 1024 (see util.cpp); 0 turns
+    // the check off and leaves rotation entirely to logrotate.
+    string strMaxDebugSize = argval2(argc, argv, "/maxdebugfilesize", "-maxdebugfilesize");
+    if (!strMaxDebugSize.empty())
+    {
+        int64 nMB = atoi64(strMaxDebugSize.c_str());
+        if (nMB < 0)
+            fprintf(stderr, "Ignoring /maxdebugfilesize=%s: not a size in MB\n",
+                    strMaxDebugSize.c_str());
+        else
+            nMaxDebugFileSize = nMB * 1024 * 1024;
+    }
+
     if (arg(argc,argv,"/gen") || arg(argc,argv,"-gen"))
     {
         fGenerateBitcoins = 1;