X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Flog.c;h=a791450da0a4bba518ca3a7969e05b786d9cf738;hb=112cce261d537006fd97ab43512bca2ffbbb3c7d;hp=05bd3dcea94eeb455112fb8747dc635a6f592401;hpb=8f25becb220b321f0e9bd4b766ae7085a0335466;p=tlsproxy%2Ftlsproxy.git

diff --git a/src/log.c b/src/log.c
index 05bd3dc..a791450 100644
--- a/src/log.c
+++ b/src/log.c
@@ -45,7 +45,10 @@ void log_message(int level, const char *file, int line, const char *format, ...)
     (void)line;
 #endif
 
-    fprintf(stdout,
+    /* Prevent another thread from interrupting the two printfs(). */
+    flockfile(stderr);
+
+    fprintf(stderr,
 #ifdef DEBUG
             "%-12s:%-3d "
 #endif
@@ -55,7 +58,9 @@ void log_message(int level, const char *file, int line, const char *format, ...)
 #endif
             level_string, (int)pthread_self());
     va_start(ap, format);
-    vfprintf(stdout, format, ap);
+    vfprintf(stderr, format, ap);
     va_end(ap);
-    fprintf(stdout, "\n");
+    fprintf(stderr, "\n");
+
+    funlockfile(stderr);
 }