X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Flog.c;h=05acddfc8b98b5d8fcb37f89f1974b47d32c59b1;hb=53e159fbb77f259b885a759aa5884564140e2f62;hp=02cadd200d7bc6dd8f5460f19435d11af16c4d67;hpb=62bffb28964ae13d193414f747a25703a2583f77;p=tlsproxy%2Ftlsproxy.git

diff --git a/src/log.c b/src/log.c
index 02cadd2..05acddf 100644
--- a/src/log.c
+++ b/src/log.c
@@ -45,7 +45,9 @@ void log_message(int level, const char *file, int line, const char *format, ...)
     (void)line;
 #endif
 
-    va_start(ap, format);
+    /* Prevent another thread from interrupting the two printfs(). */
+    flockfile(stdout);
+
     fprintf(stdout,
 #ifdef DEBUG
             "%-12s:%-3d "
@@ -55,7 +57,10 @@ void log_message(int level, const char *file, int line, const char *format, ...)
             file, line,
 #endif
             level_string, (int)pthread_self());
+    va_start(ap, format);
     vfprintf(stdout, format, ap);
-    fprintf(stdout, "\n");
     va_end(ap);
+    fprintf(stdout, "\n");
+
+    funlockfile(stdout);
 }