1 files changed, 263 insertions, 0 deletions
diff --git a/integrationtests/cmd/ioworkload/scenario_readwrite.go b/integrationtests/cmd/ioworkload/scenario_readwrite.go
new file mode 100644
index 0000000..c676b90
--- /dev/null
+++ b/integrationtests/cmd/ioworkload/scenario_readwrite.go
@@ -0,0 +1,263 @@
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+// readwriteBasic opens a file, writes data, seeks to start, reads it back.
+func readwriteBasic() error {
+	dir, cleanup, err := makeTempDir("readwrite-basic")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "rwfile.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	data := []byte("hello from ioworkload")
+	if _, err := syscall.Write(fd, data); err != nil {
+		return fmt.Errorf("write: %w", err)
+	}
+	if _, err := syscall.Seek(fd, 0, 0); err != nil {
+		return fmt.Errorf("seek: %w", err)
+	}
+
+	buf := make([]byte, len(data))
+	if _, err := syscall.Read(fd, buf); err != nil {
+		return fmt.Errorf("read: %w", err)
+	}
+	return nil
+}
+
+// readwritePread opens a file, writes data, then reads it back via pread64.
+func readwritePread() error {
+	dir, cleanup, err := makeTempDir("readwrite-pread")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "preadfile.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	data := []byte("pread test data")
+	if _, err := syscall.Write(fd, data); err != nil {
+		return fmt.Errorf("write: %w", err)
+	}
+
+	buf := make([]byte, len(data))
+	if _, err := syscall.Pread(fd, buf, 0); err != nil {
+		return fmt.Errorf("pread: %w", err)
+	}
+	return nil
+}
+
+// readwritePwrite opens a file and writes data via pwrite64.
+func readwritePwrite() error {
+	dir, cleanup, err := makeTempDir("readwrite-pwrite")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "pwritefile.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	if _, err := syscall.Pwrite(fd, []byte("pwrite test data"), 0); err != nil {
+		return fmt.Errorf("pwrite: %w", err)
+	}
+	return nil
+}
+
+// readwriteReadv opens a file, writes data, then reads it back via readv.
+func readwriteReadv() error {
+	dir, cleanup, err := makeTempDir("readwrite-readv")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "readvfile.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	data := []byte("readv test data here")
+	if _, err := syscall.Write(fd, data); err != nil {
+		return fmt.Errorf("write: %w", err)
+	}
+	if _, err := syscall.Seek(fd, 0, 0); err != nil {
+		return fmt.Errorf("seek: %w", err)
+	}
+
+	buf1 := make([]byte, 5)
+	buf2 := make([]byte, 15)
+	iovs := []syscall.Iovec{
+		{Base: &buf1[0], Len: uint64(len(buf1))},
+		{Base: &buf2[0], Len: uint64(len(buf2))},
+	}
+	_, _, errno := syscall.Syscall(syscall.SYS_READV, uintptr(fd), uintptr(unsafe.Pointer(&iovs[0])), uintptr(len(iovs)))
+	runtime.KeepAlive(buf1)
+	runtime.KeepAlive(buf2)
+	if errno != 0 {
+		return fmt.Errorf("readv: %w", errno)
+	}
+	return nil
+}
+
+// readwriteWritev opens a file and writes data via writev.
+func readwriteWritev() error {
+	dir, cleanup, err := makeTempDir("readwrite-writev")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "writevfile.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	buf1 := []byte("writev ")
+	buf2 := []byte("test data")
+	iovs := []syscall.Iovec{
+		{Base: &buf1[0], Len: uint64(len(buf1))},
+		{Base: &buf2[0], Len: uint64(len(buf2))},
+	}
+	_, _, errno := syscall.Syscall(syscall.SYS_WRITEV, uintptr(fd), uintptr(unsafe.Pointer(&iovs[0])), uintptr(len(iovs)))
+	runtime.KeepAlive(buf1)
+	runtime.KeepAlive(buf2)
+	if errno != 0 {
+		return fmt.Errorf("writev: %w", errno)
+	}
+	return nil
+}
+
+// readwriteWronlyRead opens a file O_WRONLY, then attempts to read from it.
+// The read fails with EBADF, but ior should capture the enter_read tracepoint
+// because arguments are read on syscall entry before the kernel returns an error.
+func readwriteWronlyRead() error {
+	dir, cleanup, err := makeTempDir("readwrite-wronly-read")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "wronlyfile.txt")
+	fd, err := syscall.Open(path, syscall.O_WRONLY|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	buf := make([]byte, 16)
+	_, err = syscall.Read(fd, buf)
+	if err == nil {
+		return fmt.Errorf("expected read from wronly fd to fail")
+	}
+	return nil
+}
+
+// readwriteRdonlyWrite opens a file O_RDONLY, then attempts to write to it.
+// The write fails with EBADF, but ior should capture the enter_write tracepoint
+// because arguments are read on syscall entry before the kernel returns an error.
+func readwriteRdonlyWrite() error {
+	dir, cleanup, err := makeTempDir("readwrite-rdonly-write")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "rdonlywritefile.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("create file: %w", err)
+	}
+	syscall.Close(fd)
+
+	fd, err = syscall.Open(path, syscall.O_RDONLY, 0)
+	if err != nil {
+		return fmt.Errorf("open rdonly: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	_, err = syscall.Write(fd, []byte("should fail"))
+	if err == nil {
+		return fmt.Errorf("expected write to rdonly fd to fail")
+	}
+	return nil
+}
+
+// readwritePreadInvalid calls pread64 with a negative offset (-1).
+// The syscall fails with EINVAL, but ior should capture the enter_pread64
+// tracepoint because arguments are read on syscall entry.
+func readwritePreadInvalid() error {
+	dir, cleanup, err := makeTempDir("readwrite-pread-invalid")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "preadinvalid.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	if _, err := syscall.Write(fd, []byte("some data")); err != nil {
+		return fmt.Errorf("write: %w", err)
+	}
+
+	buf := make([]byte, 16)
+	_, err = syscall.Pread(fd, buf, -1)
+	if err == nil {
+		return fmt.Errorf("expected pread with negative offset to fail")
+	}
+	return nil
+}
+
+// readwritePwriteInvalid calls pwrite64 with a negative offset (-1).
+// The syscall fails with EINVAL, but ior should capture the enter_pwrite64
+// tracepoint because arguments are read on syscall entry.
+func readwritePwriteInvalid() error {
+	dir, cleanup, err := makeTempDir("readwrite-pwrite-invalid")
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	path := filepath.Join(dir, "pwriteinvalid.txt")
+	fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CREAT, 0o644)
+	if err != nil {
+		return fmt.Errorf("open: %w", err)
+	}
+	defer syscall.Close(fd)
+
+	_, err = syscall.Pwrite(fd, []byte("should fail"), -1)
+	if err == nil {
+		return fmt.Errorf("expected pwrite with negative offset to fail")
+	}
+	return nil
+}