[PATCH] add SOCK_STREAM support for syslog

[Hrvoje Varga <hrvoje.varga@sartura.hr>]

To be consistent with glibc and uClibc since both glibc and uClibc
have a support for connecting to SOCK_STREAM socket in case
when connection to a SOCK_DGRAM is unsuccessful. This patch mimics the
same behavior.

There was a discussion whether the musl should support the SOCK_STREAM
on musl mailing list http://www.openwall.com/lists/musl/2015/08/10/1.

Signed-off-by: Hrvoje Varga <hrvoje.varga@sartura.hr>
---
 src/misc/syslog.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/misc/syslog.c b/src/misc/syslog.c
index 9dd1ddb5..101847a4 100644
--- a/src/misc/syslog.c
+++ b/src/misc/syslog.c
@@ -48,8 +48,22 @@ void closelog(void)
 
 static void __openlog()
 {
-	log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
-	if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr);
+	int retry = 0;
+	int sock_type = SOCK_DGRAM;
+	while (retry < 2) {
+		retry++;
+		log_fd = socket(AF_UNIX, sock_type|SOCK_CLOEXEC, 0);
+		if (log_fd >= 0) {
+			if (connect(log_fd, (void *)&log_addr, sizeof log_addr) != -1) {
+				return;
+			}
+			if (errno == EPROTOTYPE) {
+				sock_type = SOCK_STREAM;
+			}
+			close(log_fd);
+			log_fd = -1;
+		}
+	}
 }
 
 void openlog(const char *ident, int opt, int facility)
-- 
2.14.1