Descriptio: logging to stderr
 output is slightly different from glibc (timestamp added)
Index: b/usr/src/lib/libc/port/gen/syslog.c
===================================================================
--- a/usr/src/lib/libc/port/gen/syslog.c
+++ b/usr/src/lib/libc/port/gen/syslog.c
@@ -338,9 +338,7 @@ vsyslog(int pri, const char *fmt, va_lis
 	dat.buf = outline;
 
 	/* output the message to the local logger */
-	if ((putmsg(LogFile, &ctl, &dat, 0) >= 0) && syslogd_ok())
-		return;
-	if (!(LogStat & LOG_CONS))
+	if ((putmsg(LogFile, &ctl, &dat, 0) >= 0) && syslogd_ok() && !(LogStat & LOG_PERROR))
 		return;
 
 	/*
@@ -353,6 +351,15 @@ vsyslog(int pri, const char *fmt, va_lis
 
 	clen = strlen(outline) + 1;
 
+	if (LogStat & LOG_PERROR)
+	{
+		outline[clen - 1] = '\n';
+		(void) write(STDERR_FILENO, outline, clen);
+	}
+
+	if (!(LogStat & LOG_CONS))
+		return;
+
 	nowait = (LogStat & LOG_NOWAIT);
 	pid = forkx(nowait? 0 : (FORK_NOSIGCHLD | FORK_WAITPID));
 	if (pid == -1)
Index: b/usr/src/head/syslog.h
===================================================================
--- a/usr/src/head/syslog.h
+++ b/usr/src/head/syslog.h
@@ -33,6 +33,10 @@
 #include <sys/syslog.h>
 #include <sys/va_list.h>
 
+#ifndef LOG_PERROR
+#define LOG_PERROR 0x20
+#endif
+
 #define LOG_PRI(p) ((p) & LOG_PRIMASK)
 #define LOG_MAKEPRI(fac, pri) ((fac) | (pri))