diff --git a/libs/unistd.sols b/libs/unistd.sols
new file mode 100644
index 0000000..19249fd
--- /dev/null
+++ b/libs/unistd.sols
@@ -0,0 +1,43 @@
+def unistd_Crypt(string key, string value) string {}
+def unistd_GetHostId() string {}
+def unistd_SetHotId(int hostid) int {}
+def unistd_GetHostname() string {}
+def unistd_SetHostname(string name) int {}
+
+def unistd_Alarm(int seconds) int {}
+def unistd_Pause() int {}
+
+unistd_F_OK = 0
+unistd_R_OK = 0
+unistd_W_OK = 0
+unistd_X_OK = 0
+
+def unistd_Access(string path, int mode) int {}
+def unistd_Chdir(string path) int {}
+def unistd_Chown(string path, int owner, int group) int {}
+def unistd_Link(string oldpath, string newpath) int {}
+def unistd_Rmdir(string path) int {}
+def unistd_Symlink(string target, string linkpath) int {}
+
+def unistd_Exit(int status) int {}
+def unistd_Fork() int {}
+def unistd_GetPid() int {}
+def unistd_GetPPid() int {}
+def unistd_GetSid(int pid) int {}
+def unistd_Nice(int inc) int {}
+def unistd_SetSid() int {}
+def unistd_Sleep(int seconds) int {}
+
+def unistd_GetGid() int {}
+def unistd_GetEGid() int {}
+def unistd_GetUid() int {}
+def unistd_GetEUid() int {}
+def unistd_GetLogin() string {}
+def unistd_SetEUid(int euid) int {}
+def unistd_SetEGid(int egid) int {}
+def unistd_SetREUid(int ruid, int euid) int {}
+def unistd_SetREGid(int rgid, int egid) int {}
+
+ground {
+    extern "unistd"
+}