File 0185-vsyslog-replacement-if-not-present.patch of Package erlang

From a839aaefd996032253f0f86fe23c4358386b70af Mon Sep 17 00:00:00 2001
From: Calvin Buckley <calvin@cmpct.info>
Date: Fri, 25 Jan 2019 09:17:16 -0500
Subject: [PATCH 05/12] vsyslog replacement if not present

---
 erts/configure.in       |  2 +-
 erts/etc/unix/run_erl.c | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/erts/configure.in b/erts/configure.in
index 78baba6a63..f7d883bcca 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -2036,7 +2036,7 @@ AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlop
 		gethrtime localtime_r gmtime_r inet_pton mprotect \
 		mmap mremap memcpy mallopt sbrk _sbrk __sbrk brk _brk __brk \
 		flockfile fstat strlcpy strlcat setsid posix2time time2posix \
-		setlocale nl_langinfo poll mlockall ppoll])
+		setlocale nl_langinfo poll mlockall ppoll vsyslog])
 
 AC_MSG_CHECKING([for isfinite])
 AC_TRY_LINK([#include <math.h>],
diff --git a/erts/etc/unix/run_erl.c b/erts/etc/unix/run_erl.c
index bfb3e1bd2c..e974630695 100644
--- a/erts/etc/unix/run_erl.c
+++ b/erts/etc/unix/run_erl.c
@@ -1201,7 +1201,19 @@ static void error_logf(int priority, int line, const char *format, ...)
 
 #ifdef HAVE_SYSLOG_H
     if (run_daemon) {
+#ifdef HAVE_VSYSLOG
 	vsyslog(priority,format,args);
+#else
+	/* Some OSes like AIX lack vsyslog. */
+	va_list ap;
+	char message[900]; /* AIX man page says truncation past this */
+
+	va_start (ap, format);
+	vsnprintf(message, 900, format, ap);
+	va_end(ap);
+
+	syslog(priority, message);
+#endif
     }
     else
 #endif
-- 
2.16.4