From a0d6f222864301c11afd9c1d3306e6bfe8446d5d Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Thu, 21 May 2026 08:28:37 +0300
Subject: f7 wire eventfd kind for fd-from-air IPC syscalls

---
 cmd/ioworkload/scenario_ipc.go | 33 +++++++++++++++++++++++++++++++++
 cmd/ioworkload/scenarios.go    |  1 +
 2 files changed, 34 insertions(+)

(limited to 'cmd')

diff --git a/cmd/ioworkload/scenario_ipc.go b/cmd/ioworkload/scenario_ipc.go
index 221c3c9..af22505 100644
--- a/cmd/ioworkload/scenario_ipc.go
+++ b/cmd/ioworkload/scenario_ipc.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"syscall"
+	"unsafe"
 
 	"golang.org/x/sys/unix"
 )
@@ -54,3 +55,35 @@ func createEventfd(number uintptr, initval, flags uintptr) (int, error) {
 	}
 	return int(fd), nil
 }
+
+func fdFromAirEventfdUsers() error {
+	memfdName, err := syscall.BytePtrFromString("ior-memfd")
+	if err != nil {
+		return fmt.Errorf("memfd name: %w", err)
+	}
+	fd, _, _ := syscall.RawSyscall(unix.SYS_MEMFD_CREATE, uintptr(unsafe.Pointer(memfdName)), uintptr(unix.MFD_CLOEXEC), 0)
+	closeIfValid(int(fd))
+
+	fd, _, _ = syscall.RawSyscall(unix.SYS_MEMFD_SECRET, 0, 0, 0)
+	closeIfValid(int(fd))
+
+	fd, _, _ = syscall.RawSyscall(unix.SYS_USERFAULTFD, uintptr(unix.O_CLOEXEC), 0, 0)
+	closeIfValid(int(fd))
+
+	var mask unix.Sigset_t
+	fd, _, _ = syscall.RawSyscall(unix.SYS_SIGNALFD, ^uintptr(0), uintptr(unsafe.Pointer(&mask)), uintptr(unsafe.Sizeof(mask)))
+	closeIfValid(int(fd))
+
+	fd, _, _ = syscall.RawSyscall(unix.SYS_SIGNALFD4, ^uintptr(0), uintptr(unsafe.Pointer(&mask)), uintptr(unsafe.Sizeof(mask)))
+	closeIfValid(int(fd))
+
+	fd, _, _ = syscall.RawSyscall(unix.SYS_TIMERFD_CREATE, uintptr(unix.CLOCK_MONOTONIC), uintptr(unix.TFD_CLOEXEC), 0)
+	closeIfValid(int(fd))
+	return nil
+}
+
+func closeIfValid(fd int) {
+	if fd >= 0 {
+		_ = syscall.Close(fd)
+	}
+}
diff --git a/cmd/ioworkload/scenarios.go b/cmd/ioworkload/scenarios.go
index 1ec8e6d..ba444ef 100644
--- a/cmd/ioworkload/scenarios.go
+++ b/cmd/ioworkload/scenarios.go
@@ -34,6 +34,7 @@ var scenarios = map[string]func() error{
 	"pipe2-basic":                   pipe2Basic,
 	"eventfd-basic":                 eventfdBasic,
 	"eventfd2-basic":                eventfd2Basic,
+	"fd-from-air-eventfd-users":     fdFromAirEventfdUsers,
 	"mq-posix-basic":                mqPosixBasic,
 	"mountfs-management":            mountfsManagement,
 	"polling-epoll":                 pollingEpoll,
-- 
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