diff --git a/fs/fcntl.c b/fs/fcntl.c
index b7eb2d0dc0d8390d342e6abeb795461ba0790719..6264bb20d628e60f3b551ab97ac3f42daf577e4b 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -32,3 +32,34 @@ int sys_dup(unsigned int fildes) {
     return dupfd(fildes, 0);
 }
 
+int sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg) {
+    struct file * filp;
+
+    if (fd >= NR_OPEN || !(filp = current->filp[fd]))
+        return -EBADF;
+    switch (cmd) {
+        case F_DUPFD:
+            return dupfd(fd,arg);
+        case F_GETFD:
+            return (current->close_on_exec>>fd)&1;
+        case F_SETFD:
+            if (arg&1)
+                current->close_on_exec |= (1<<fd);
+            else
+                current->close_on_exec &= ~(1<<fd);
+            return 0;
+        case F_GETFL:
+            return filp->f_flags;
+        case F_SETFL:
+            filp->f_flags &= ~(O_APPEND | O_NONBLOCK);
+            filp->f_flags |= arg & (O_APPEND | O_NONBLOCK);
+            return 0;
+        case F_GETLK:
+        case F_SETLK:
+        case F_SETLKW:
+            return -1;
+        default:
+            return -1;
+    }
+}
+
diff --git a/include/fcntl.h b/include/fcntl.h
index 6dac764beb83bf8979cb01f96ef6473e554144bf..d2ed5d698952b5010ee55ca80ab1e11b8060a223 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -15,6 +15,21 @@
 #define O_NONBLOCK      04000
 #define O_NDELAY        O_NONBLOCK
 
+#define F_DUPFD         0
+#define F_GETFD         1
+#define F_SETFD         2
+#define F_GETFL         3
+#define F_SETFL         4
+#define F_GETLK         5
+#define F_SETLK         6
+#define F_SETLKW        7
+
+#define FD_CLOEXEC      1
+
+#define F_RDLCK         0
+#define F_WRLCK         1
+#define F_UNLCK         2
+
 extern int open(const char * filename, int flags, ...);
 
 #endif
diff --git a/include/linux/sys.h b/include/linux/sys.h
index 532b87be17f0a111c66ee25a701dd47f9e8a658d..85f11ec31d04607f3aedf84466431019c8b6c514 100644
--- a/include/linux/sys.h
+++ b/include/linux/sys.h
@@ -53,7 +53,7 @@ extern int sys_acct();
 extern int sys_phys();
 extern int sys_lock();
 extern int sys_ioctl();
-//extern int sys_fcntl();
+extern int sys_fcntl();
 extern int sys_mpx();
 //extern int sys_setpgid();
 extern int sys_ulimit();
@@ -150,7 +150,7 @@ fn_ptr sys_call_table[] = {
 
     sys_lock,
     sys_ioctl,
-    0, //    sys_fcntl,
+    sys_fcntl,
     sys_mpx,
     0, //    sys_setpgid,
     sys_ulimit,
diff --git a/include/unistd.h b/include/unistd.h
index f2436f25520185aa57967c4e296e29c42ebefa8a..e114b7e3a1af43f99831304fd8af957079b7315f 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -156,6 +156,7 @@ int chdir(const char* pathname);
 int close(int fildes);
 int dup(int fildes);
 int execve(const char * filename, char ** argv, char ** envp);
+int fcntl(int fildes, int cmd, ...);
 int fork();
 int fstat();
 int setup(void *BIOS);