diff --git a/kernel/src/sys/file.cpp b/kernel/src/sys/file.cpp
index c227da3c..58df5f97 100644
--- a/kernel/src/sys/file.cpp
+++ b/kernel/src/sys/file.cpp
@@ -113,6 +113,25 @@ Result<u64> sys_fcntl(Registers*, SyscallArgs args)
 
         return (u64)new_fd;
     }
+    case F_GETFD: return (u64) !!(descriptor.flags & O_CLOEXEC);
+    case F_SETFD: {
+        int arg = (int)args[2];
+        if (arg == FD_CLOEXEC) descriptor.flags |= O_CLOEXEC;
+        else
+            descriptor.flags &= ~O_CLOEXEC;
+        return 0;
+    }
+    case F_GETFL: return (u64)(descriptor.flags & ~O_CLOEXEC);
+    case F_SETFL: {
+        int arg = (int)args[2];
+
+        descriptor.flags &= ~(O_APPEND | O_NONBLOCK);
+        arg &= (O_APPEND | O_NONBLOCK);
+
+        descriptor.flags |= arg;
+
+        return 0;
+    }
     default: return err(EINVAL);
     }
 }
diff --git a/libc/include/bits/fcntl.h b/libc/include/bits/fcntl.h
index c2178168..218fb0bc 100644
--- a/libc/include/bits/fcntl.h
+++ b/libc/include/bits/fcntl.h
@@ -5,5 +5,11 @@
 
 #define F_DUPFD 0
 #define F_DUPFD_CLOEXEC 1
+#define F_GETFD 2
+#define F_SETFD 3
+#define F_SETFL 4
+#define F_GETFL 5
+
+#define FD_CLOEXEC 1
 
 #endif
diff --git a/libc/include/bits/open-flags.h b/libc/include/bits/open-flags.h
index c0f7e680..2b9e3e78 100644
--- a/libc/include/bits/open-flags.h
+++ b/libc/include/bits/open-flags.h
@@ -13,4 +13,6 @@
 #define O_NONBLOCK 64
 #define O_CLOEXEC 128
 
+#define O_ACCMODE O_RDWR
+
 #endif