syslog.h: add __printflike to syslog functions
Allow the compiler to detect formating bugs.
Change-Id: I6a4af6cae59dc3adf14b075431a41885213a649a
diff --git a/libc/include/syslog.h b/libc/include/syslog.h
index d35bc79..423eded 100644
--- a/libc/include/syslog.h
+++ b/libc/include/syslog.h
@@ -103,13 +103,13 @@
extern void closelog(void);
extern void openlog(const char *, int, int);
extern int setlogmask(int);
-extern void syslog(int, const char *, ...);
-extern void vsyslog(int, const char *, va_list);
+extern void syslog(int, const char *, ...) __printflike(2, 3);
+extern void vsyslog(int, const char *, va_list) __printflike(2, 0);
extern void closelog_r(struct syslog_data *);
extern void openlog_r(const char *, int, int, struct syslog_data *);
extern int setlogmask_r(int, struct syslog_data *);
-extern void syslog_r(int, struct syslog_data *, const char *, ...);
-extern void vsyslog_r(int, struct syslog_data *, const char *, va_list);
+extern void syslog_r(int, struct syslog_data *, const char *, ...) __printflike(3, 4);
+extern void vsyslog_r(int, struct syslog_data *, const char *, va_list) __printflike(3, 0);
__END_DECLS
