1 files changed, 5 insertions, 0 deletions
diff --git a/user/user.h b/user/user.h
index 16cf173..34591fd 100644
--- a/user/user.h
+++ b/user/user.h
@@ -1,4 +1,5 @@
 struct stat;
+struct sysinfo;
 
 // system calls
 int fork(void);
@@ -30,6 +31,10 @@ int pgaccess(void *base, int len, void *mask);
 // usyscall region
 int ugetpid(void);
 #endif
+int trace(int);
+int sysinfo(struct sysinfo*);
+int sigalarm(int ticks, void (*handler)());
+int sigreturn(void);
 
 // ulib.c
 int stat(const char*, struct stat*);