1 files changed, 74 insertions, 0 deletions
diff --git a/klibc/klibc/syslog.c b/klibc/klibc/syslog.c
new file mode 100644
index 0000000000..b031d4f0e7
--- /dev/null
+++ b/klibc/klibc/syslog.c
@@ -0,0 +1,74 @@
+/*
+ * syslog.c
+ *
+ * Issue syslog messages via the kernel printk queue.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+/* Maximum size for a kernel message */
+#define BUFLEN 1024
+
+/* Logging node */
+#define LOGDEV "/dev/kmsg"
+
+/* Max length of ID string */
+#define MAXID 31
+
+int __syslog_fd = -1;
+static char id[MAXID+1];
+
+void openlog(const char *ident, int option, int facility)
+{
+  int fd;
+
+  (void)option; (void)facility;	/* Unused */
+  
+  if ( __syslog_fd == -1 ) {
+    __syslog_fd = fd = open(LOGDEV, O_WRONLY);
+    if ( fd == -1 )
+      return;
+    fcntl(fd, F_SETFD, (long)FD_CLOEXEC);
+  }
+  
+  strncpy(id, ident?ident:"", MAXID);
+  id[MAXID] = '\0';		/* Make sure it's null-terminated */
+}
+
+void syslog(int prio, const char *format, ...)
+{
+  va_list ap;
+  char buf[BUFLEN];
+  int rv, len;
+  int fd;
+
+  if ( __syslog_fd == -1 )
+    openlog(NULL, 0, 0);
+
+  fd = __syslog_fd;
+  if ( fd == -1 )
+    fd = 2;			/* Failed to open log, write to stderr */
+
+  buf[0] = '<';
+  buf[1] = LOG_PRI(prio)+'0';
+  buf[2] = '>';
+  len = 3;
+
+  if ( *id )
+    len += sprintf(buf+3, "%s: ", id);
+  
+  va_start(ap, format);
+  rv = vsnprintf(buf+len, BUFLEN-len, format, ap);
+  va_end(ap);
+
+  len += rv;
+  if ( len > BUFLEN-1 ) len = BUFLEN-1;
+  buf[len] = '\n';
+
+  write(fd, buf, len+1);
+}