---
name: "ACE_DEV_IO"
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_DEV_IO"
---

# ACE\_DEV\_IO(3)

Read/Write operations on Devices.

## NAME

ACE\_DEV\_IO -  Read/Write operations on Devices.

## SYNOPSIS

```
#include <ace/DEV_IO.h>
class ACE_DEV_IO : public ACE_DEV
{
  public:
    friend class ACE_DEV_Connector;
    ACE_DEV_IO (void);
    ssize_t send (const void *buf, size_t n) const;
    ssize_t recv (void *buf, size_t n) const;
    ssize_t send_n (const void *buf, size_t n) const;
    ssize_t recv_n (void *buf, size_t n) const;
    ssize_t recv (
        ACE_Str_Buf *cntl,
        ACE_Str_Buf *data,
        int *band,
        int *flags
        ) const;
    ssize_t send (
        const ACE_Str_Buf *cntl,
        const ACE_Str_Buf *data,
        int band,
        int flags
        ) const;
    ssize_t recv (
        ACE_Str_Buf *cntl,
        ACE_Str_Buf *data,
        int *flags
        ) const;
    ssize_t send (
        const ACE_Str_Buf *cntl,
        const ACE_Str_Buf *data,
        int flags = 0
        ) const;
    ssize_t send (const iovec iov[], size_t n) const;
    ssize_t recv (iovec iov[], size_t n) const;
    ssize_t send (size_t n, ...) const;
    ssize_t recv (size_t n, ...) const;
    ssize_t send (
        const void *buf,
        size_t n,
        ACE_OVERLAPPED *overlapped
        ) const;
    ssize_t recv (
        void *buf,
        size_t n,
        ACE_OVERLAPPED *overlapped
        ) const;
    void dump (void) const;
    int get_local_addr (ACE_DEV_Addr &) const;
    int get_remote_addr (ACE_DEV_Addr &) const;
    ACE_ALLOC_HOOK_DECLARE;
    typedef ACE_DEV_Addr PEER_ADDR;
  private:
    ACE_DEV_Addr addr_;
};
```

## Various send operations.

```
ssize_t send (const void *buf, size_t n) const;
```

send upto n bytes in buf.

```
ssize_t recv (void *buf, size_t n) const;
```

Recv upto n bytes in buf.

```
ssize_t send_n (const void *buf, size_t n) const;
```

Send n bytes, keep trying until n are sent.

```
ssize_t recv_n (void *buf, size_t n) const;
```

Recv n bytes, keep trying until n are received.

```
ssize_t recv (
    ACE_Str_Buf *cntl,
    ACE_Str_Buf *data,
    int *band,
    int *flags
    ) const;
```

Recv bytes via STREAM pipes using "band" mode.

```
ssize_t send (
    const ACE_Str_Buf *cntl,
    const ACE_Str_Buf *data,
    int band,
    int flags
    ) const;
```

Send bytes via STREAM pipes using "band" mode.

```
ssize_t recv (ACE_Str_Buf *cntl, ACE_Str_Buf *data, int *flags) const;
```

Recv cntl and data via STREAM pipes.

```
ssize_t send (
    const ACE_Str_Buf *cntl,
    const ACE_Str_Buf *data,
    int flags = 0
    ) const;
```

Send cntl and data via STREAM pipes.

```
ssize_t send (const iovec iov[], size_t n) const;
```

Send iovecs via ::writev.

```
ssize_t recv (iovec iov[], size_t n) const;
```

Recv iovecs via ::readv.

```
ssize_t send (size_t n, ...) const;
```

Send N char \*ptrs and int lengths.  Note that the char \*'s precede the ints (basically, an varargs version of writev).  The count N is the \*total\* number of trailing arguments, \*not\* a couple of the number of tuple pairs!

```
ssize_t recv (size_t n, ...) const;
```

This is an interface to ::readv, that doesn't use the struct iovec explicitly.  The ... can be passed as an arbitrary number of (char \*ptr, int len) tuples.  However, the count N is the \*total\* number of trailing arguments, \*not\* a couple of the number of tuple pairs!

```
ssize_t send (
    const void *buf,
    size_t n,
    ACE_OVERLAPPED *overlapped
    ) const;
```

Send n bytes via Win32 WriteFile using overlapped I/O.

```
ssize_t recv (void *buf, size_t n, ACE_OVERLAPPED *overlapped) const;
```

Recv n bytes via Win32 ReadFile using overlapped I/O.

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

Dump the state of an object.

## The following two methods are no-ops to keep the

ACE\_Connector happy.

```
int get_local_addr (ACE_DEV_Addr &) const;
```

Return the local endpoint address.

```
int get_remote_addr (ACE_DEV_Addr &) const;
```

Return the address of the remotely connected peer (if there is one).

```
ACE_ALLOC_HOOK_DECLARE;
```

Declare the dynamic allocation hooks.

## Meta-type info

```
typedef ACE_DEV_Addr PEER_ADDR;
```

## AUTHOR

Gerhard Lenzer and Douglas C. Schmidt

## LIBRARY

ace