---
name: "ACE_IO_Cntl_Msg"
section: "3"
platform: "linux"
package: "libace-doc"
version: "5.0.7-4"
release: "Debian 2.2 (Potato)"
platforms: ["linux"]
url: "https://new.carta.tech/ACE_IO_Cntl_Msg"
---

# ACE\_IO\_Cntl\_Msg(3)

Data format for IOCTL messages

## NAME

ACE\_IO\_Cntl\_Msg -  Data format for IOCTL messages

## SYNOPSIS

```
#include <ace/IO_Cntl_Msg.h>
class ACE_IO_Cntl_Msg
{
  public:
        enum ACE_IO_Cntl_Cmds{ SET_LWM = 1,
        GET_LWM = 2,
        SET_HWM = 3,
        GET_HWM = 4,
        MOD_LINK = 5,
        MOD_UNLINK = 6 };

    inline ACE_IO_Cntl_Msg (ACE_IO_Cntl_Cmds c);
    inline ACE_IO_Cntl_Cmds cmd (void);
    inline void cmd (ACE_IO_Cntl_Cmds c);
    inline size_t count (void);
    inline void count (size_t c);
    inline int error (void);
    inline void error (int e);
    inline int rval (void);
    inline void rval (int r);
    void dump (void) const;
    ACE_ALLOC_HOOK_DECLARE;
  private:
    ACE_IO_Cntl_Cmds cmd_;
    size_t count_;
    int error_;
    int rval_;
};
```

## Initialization method.

```
inline ACE_IO_Cntl_Msg (ACE_IO_Cntl_Cmds c);
```

Initialize the control message.

## Get/set methods

```
inline ACE_IO_Cntl_Cmds cmd (void);
```

Get command.

```
inline void cmd (ACE_IO_Cntl_Cmds c);
```

Set command.

```
inline size_t count (void);
```

Get count.

```
inline void count (size_t c);
```

Set count.

```
inline int error (void);
```

Get error.

```
inline void error (int e);
```

Set error.

```
inline int rval (void);
```

Get return value.

```
inline void rval (int r);
```

Set return value.

```
void dump (void) const;
```

Dump the state of an object.

```
ACE_ALLOC_HOOK_DECLARE;
```

Declare the dynamic allocation hooks.

## AUTHOR

Doug Schmidt

## LIBRARY

ace