OrionLibC

diff --git a/include/unistd.h b/include/unistd.h
new file mode 100644
index 0000000..c250e84
--- /dev/null
+++ b/include/unistd.h
@@ -0,0 +1,46 @@
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#include <sys/types.h>
+#include <stddef.h>
+
+typedef int intptr_t;
+
+#define STDIN_FILENO 0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int execv(const char *, char *[]);
+int execve(const char *, char *[], char *[]);
+int execvp(const char *, char *[]);
+pid_t fork(void);
+pid_t getpid(void);
+uid_t getuid(void);
+int setuid(uid_t uid);
+uid_t geteuid(void);
+int seteuid(uid_t euid);
+gid_t getgid(void);
+int setgid(gid_t gid);
+gid_t getegid(void);
+int setegid(gid_t egid);
+int isatty(int fd);
+int close(int fd);
+int dup(int oldfd);
+int dup2(int oldfd, int newfd);
+size_t read(int fd, void *buf, size_t count);
+size_t write(int fd, void *buf, size_t count);
+off_t lseek(int fd, off_t offset, int whence);
+int rmdir(const char *pathname);
+int chroot(const char *path);
+int chdir(const char *path);
+char *getcwd(char *buf, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif