thanks tyfkda

1 files changed, 12 insertions, 12 deletions

diff --git a/user.h b/user.h
index f45b8d5..4f99c52 100644
--- a/user.h
+++ b/user.h
@@ -6,18 +6,18 @@ int fork(void);
 int exit(void) __attribute__((noreturn));
 int wait(void);
 int pipe(int*);
-int write(int, void*, int);
+int write(int, const void*, int);
 int read(int, void*, int);
 int close(int);
 int kill(int);
 int exec(char*, char**);
-int open(char*, int);
-int mknod(char*, short, short);
-int unlink(char*);
+int open(const char*, int);
+int mknod(const char*, short, short);
+int unlink(const char*);
 int fstat(int fd, struct stat*);
-int link(char*, char*);
-int mkdir(char*);
-int chdir(char*);
+int link(const char*, const char*);
+int mkdir(const char*);
+int chdir(const char*);
 int dup(int);
 int getpid(void);
 char* sbrk(int);
@@ -25,14 +25,14 @@ int sleep(int);
 int uptime(void);
 
 // ulib.c
-int stat(char*, struct stat*);
-char* strcpy(char*, char*);
-void *memmove(void*, void*, int);
+int stat(const char*, struct stat*);
+char* strcpy(char*, const char*);
+void *memmove(void*, const void*, int);
 char* strchr(const char*, char c);
 int strcmp(const char*, const char*);
-void printf(int, char*, ...);
+void printf(int, const char*, ...);
 char* gets(char*, int max);
-uint strlen(char*);
+uint strlen(const char*);
 void* memset(void*, int, uint);
 void* malloc(uint);
 void free(void*);