From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 12 Feb 2011 00:22:29 -0500
Subject: initial check-in, version 0.5.0

---
 src/misc/syslog.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/misc/syslog.c

(limited to 'src/misc/syslog.c')

diff --git a/src/misc/syslog.c b/src/misc/syslog.c
new file mode 100644
index 00000000..4809d2da
--- /dev/null
+++ b/src/misc/syslog.c
@@ -0,0 +1,115 @@
+#include <stdarg.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <time.h>
+#include <signal.h>
+#include <string.h>
+#include "libc.h"
+
+static int lock;
+static const char *log_ident;
+static int log_opt;
+static int log_facility = LOG_USER;
+static int log_mask = 0xff;
+static FILE *log_f;
+
+int setlogmask(int maskpri)
+{
+	int old = log_mask;
+	if (maskpri) log_mask = maskpri;
+	return old;
+}
+
+static const struct {
+	short sun_family;
+	char sun_path[9];
+} log_addr = {
+	AF_UNIX,
+	"/dev/log"
+};
+
+void closelog(void)
+{
+	LOCK(&lock);
+	if (log_f) fclose(log_f);
+	log_f = NULL;
+	UNLOCK(&lock);
+}
+
+static void __openlog(const char *ident, int opt, int facility)
+{
+	int fd;
+
+	log_ident = ident;
+	log_opt = opt;
+	log_facility = facility;
+
+	if (!(opt & LOG_NDELAY) || log_f) return;
+
+	fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	fcntl(fd, F_SETFD, FD_CLOEXEC);
+	if (connect(fd, (void *)&log_addr, sizeof(short) + sizeof "/dev/log") < 0)
+		close(fd);
+	else log_f = fdopen(fd, "wb");
+}
+
+void openlog(const char *ident, int opt, int facility)
+{
+	LOCK(&lock);
+	__openlog(ident, opt, facility);
+	UNLOCK(&lock);
+}
+
+void syslog(int priority, const char *message, ...)
+{
+	struct sigaction sa;
+	va_list ap;
+	char timebuf[16];
+	time_t now;
+	struct tm tm;
+	//const char *fmt, *ident, *sep;
+	//int i;
+
+	if (!(log_mask & LOG_MASK(priority&7)) || (priority&~0x3ff)) return;
+
+	LOCK(&lock);
+
+	if (!log_f) __openlog(log_ident, log_opt | LOG_NDELAY, log_facility);
+	if (!log_f) {
+		UNLOCK(&lock);
+		return;
+	}
+
+	memset(&sa, 0, sizeof sa);
+	sa.sa_handler = SIG_IGN;
+	if (sigaction(SIGPIPE, &sa, &sa) < 0) {
+		// we must abandon logging or we might cause SIGPIPE
+		UNLOCK(&lock);
+		return;
+	}
+
+	now = time(NULL);
+	gmtime_r(&now, &tm);
+	strftime(timebuf, sizeof timebuf, "%b %e %T", &tm);
+
+	fprintf(log_f, "<%d>%s ", priority, timebuf);
+	if (log_ident) fprintf(log_f, "%s", log_ident);
+	if (log_opt & LOG_PID) fprintf(log_f, "[%d]", getpid());
+	if (log_ident) fprintf(log_f, ": ");
+
+	va_start(ap, message);
+	vfprintf(log_f, message, ap);
+	va_end(ap);
+	fputc(0, log_f);
+	fflush(log_f);
+
+	// Note: LOG_CONS is not supported because it is annoying!!
+	// syslogd will send messages to console if it deems them appropriate!
+
+	sigaction(SIGPIPE, &sa, NULL);
+
+	UNLOCK(&lock);
+}
-- 
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