From 0899f212c0ac4026110ea0ab7a32886631f09738 Mon Sep 17 00:00:00 2001
From: Ibuki Omatsu <isan.ethen@gmail.com>
Date: Wed, 1 Jul 2026 14:01:37 +0000
Subject: [PATCH] feat: Add fcntl

---
 Cargo.toml |  4 ++--
 src/lib.rs | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 8a52c4cfdb..9a7bc84e6f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "libredox"
 authors = ["4lDO2 <4lDO2@protonmail.com>"]
-version = "0.1.17"
+version = "0.1.18"
 edition = "2021"
 license = "MIT"
 description = "Redox stable ABI"
@@ -21,6 +21,6 @@ mkns = ["ioslice"]
 [dependencies]
 bitflags = { version = "2", optional = true }
 libc = { version = "0.2", optional = true }
-redox_syscall = { version = "0.8", optional = true }
+redox_syscall = { version = "0.9", optional = true }
 ioslice = { version = "0.6", optional = true }
 plain = { version = "0.2", optional = true }
diff --git a/src/lib.rs b/src/lib.rs
index d95697ae97..cce27f25f9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -321,6 +321,8 @@ extern "C" {
         name_len: usize,
         cap_fd: usize,
     ) -> RawResult;
+
+    fn redox_fcntl_v0(fd: usize, cmd: usize, arg: usize) -> RawResult;
 }
 
 #[cfg(feature = "call")]
@@ -451,6 +453,11 @@ impl Fd {
     ) -> Result<usize> {
         call::call_rw(self.raw(), payload, flags, metadata)
     }
+
+    #[inline]
+    pub fn fcntl(&self, cmd: usize, arg: usize) -> Result<usize> {
+        call::fcntl(self.raw(), cmd, arg)
+    }
 }
 #[cfg(feature = "call")]
 impl Drop for Fd {
@@ -793,6 +800,11 @@ pub mod call {
         })
         .map(|_| ())
     }
+
+    #[inline]
+    pub fn fcntl(fd: usize, cmd: usize, arg: usize) -> Result<usize> {
+        Error::demux(unsafe { redox_fcntl_v0(fd, cmd, arg) })
+    }
 }
 
 #[cfg(feature = "protocol")]
@@ -1086,4 +1098,8 @@ pub mod protocol {
             })
         }
     }
+
+    // CLOEXEC flags
+    pub const O_CLOEXEC: usize = 0x0100_0000;
+    pub const F_DUPFD_CLOEXEC: usize = 1030;
 }