diff -ruN a/src/header/mod.rs b/src/header/mod.rs
--- a/src/header/mod.rs	2026-04-15 09:48:02.257700000 +0100
+++ b/src/header/mod.rs	2026-04-19 13:30:00.000000000 +0100
@@ -98,6 +98,7 @@
 pub mod sys_resource;
 pub mod sys_select;
+pub mod sys_signalfd;
 // TODO: sys/sem.h
 // TODO: sys/shm.h
 pub mod sys_socket;
diff -ruN a/src/header/sys_signalfd/cbindgen.toml b/src/header/sys_signalfd/cbindgen.toml
--- a/src/header/sys_signalfd/cbindgen.toml	1970-01-01 00:00:00.000000000 +0000
+++ b/src/header/sys_signalfd/cbindgen.toml	2026-04-15 09:48:02.257754724 +0100
@@ -0,0 +1,41 @@
+sys_includes = ["signal.h", "stdint.h"]
+include_guard = "_SYS_SIGNALFD_H"
+trailer = """
+#ifndef SFD_CLOEXEC
+#define SFD_CLOEXEC 0x80000
+#endif
+
+#ifndef SFD_NONBLOCK
+#define SFD_NONBLOCK 0x800
+#endif
+
+struct signalfd_siginfo {
+    uint32_t ssi_signo;
+    int32_t ssi_errno;
+    int32_t ssi_code;
+    uint32_t ssi_pid;
+    uint32_t ssi_uid;
+    int32_t ssi_fd;
+    uint32_t ssi_tid;
+    uint32_t ssi_band;
+    uint32_t ssi_overrun;
+    uint32_t ssi_trapno;
+    int32_t ssi_status;
+    int32_t ssi_int;
+    uint64_t ssi_ptr;
+    uint64_t ssi_utime;
+    uint64_t ssi_stime;
+    uint64_t ssi_addr;
+    uint16_t ssi_addr_lsb;
+    uint16_t __pad2;
+    int32_t ssi_syscall;
+    uint64_t ssi_call_addr;
+    uint32_t ssi_arch;
+    uint8_t __pad[28];
+};
+"""
+language = "C"
+style = "Tag"
+no_includes = true
+cpp_compat = true

+[enum]
+prefix_with_name = true

+[export.rename]
+"signalfd_siginfo" = "struct signalfd_siginfo"
diff -ruN a/src/header/sys_signalfd/mod.rs b/src/header/sys_signalfd/mod.rs
--- a/src/header/sys_signalfd/mod.rs	1970-01-01 00:00:00.000000000 +0000
+++ b/src/header/sys_signalfd/mod.rs	2026-04-15 09:48:02.257778048 +0100
@@ -0,0 +1,29 @@
+//! `sys/signalfd.h` implementation.
+
+use crate::{
+    header::signal::{self, sigset_t, signalfd_siginfo},
+    platform::types::c_int,
+};
+
+pub const SFD_CLOEXEC: c_int = signal::SFD_CLOEXEC;
+pub const SFD_NONBLOCK: c_int = signal::SFD_NONBLOCK;
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn signalfd(fd: c_int, mask: *const sigset_t, masksize: usize) -> c_int {
+    unsafe { signal::signalfd(fd, mask, masksize) }
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn signalfd4(
+    fd: c_int,
+    mask: *const sigset_t,
+    masksize: usize,
+    flags: c_int,
+) -> c_int {
+    unsafe { signal::signalfd4(fd, mask, masksize, flags) }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _cbindgen_export_sys_signalfd_siginfo(siginfo: signalfd_siginfo) {
+    let _ = siginfo;
+}