[PATCH v6 09/16] daemon: use full buffered mode for stderr

From: Erik Faye-Lund <kusmabite@gmail.com>
Date: Nov 3, 2010, 16:31 UTC
Message-ID: <1288801894-1168-10-git-send-email-kusmabite@gmail.com>
In-Reply-To: <1288801894-1168-1-git-send-email-kusmabite@gmail.com>

Windows doesn't support line buffered mode for file streams, so let's just use full buffered mode with a big buffer ("4096 should be enough for everyone") and add explicit flushing.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
---
 daemon.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/daemon.c b/daemon.c
index 6eee570..9a4884a 100644
--- a/daemon.c
+++ b/daemon.c
@@ -67,12 +67,14 @@ static void logreport(int priority, const char *err, va_list params)
 		syslog(priority, "%s", buf);
 	} else {
 		/*
-		 * Since stderr is set to linebuffered mode, the
+		 * Since stderr is set to buffered mode, the
 		 * logging of different processes will not overlap
+		 * unless they overflow the (rather big) buffers.
 		 */
 		fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
 		vfprintf(stderr, err, params);
 		fputc('\n', stderr);
+		fflush(stderr);
 	}
 }
 
@@ -1117,7 +1119,7 @@ int main(int argc, char **argv)
 		set_die_routine(daemon_die);
 	} else
 		/* avoid splitting a message in the middle */
-		setvbuf(stderr, NULL, _IOLBF, 0);
+		setvbuf(stderr, NULL, _IOFBF, 4096);
 
 	if (inetd_mode && (group_name || user_name))
 		die("--user and --group are incompatible with --inetd");

-- 
1.7.3.2.161.gd6e00