MQTT C Client Libraries Internals: Socket.c File Reference

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Socket.c File Reference

Socket related functions. More...

`#include "Socket.h"`
`#include "Log.h"`
`#include "SocketBuffer.h"`
`#include "Messages.h"`
`#include "StackTrace.h"`
`#include <stdlib.h>`
`#include <string.h>`
`#include <signal.h>`
`#include <ctype.h>`
`#include "Heap.h"`
Include dependency graph for Socket.c:

## Macros
#define | ADDRLEN INET6_ADDRSTRLEN+1
#define | PORTLEN 10

## Functions
int | isReady (int index)
| Don't accept work from a client unless it is accepting work back, i.e.
int | Socket_continueWrites (SOCKET *sock, mutex_type mutex)
| Continue any outstanding socket writes.
int | Socket_setnonblocking (SOCKET sock)
| Set a socket non-blocking, OS independently.
int | Socket_error (char *aString, SOCKET sock)
| Gets the specific error corresponding to SOCKET_ERROR.
int | Socket_addSocket (SOCKET newSd)
| Add a socket to the list of socket to check with select.
int | Socket_writev (SOCKET socket, iobuf *iovecs, int count, unsigned long *bytes)
| Attempts to write a series of iovec buffers to a socket in one system call so that they are sent as one packet.
int | Socket_close_only (SOCKET socket)
| Close a socket without removing it from the select list.
int | Socket_continueWrite (SOCKET socket)
| Continue an outstanding write for a particular socket.
char * | Socket_getaddrname (struct sockaddr *sa, SOCKET sock)
| Convert a numeric address to character string.
int | Socket_abortWrite (SOCKET socket)
| Continue an outstanding write for a particular socket.
void | SIGPIPE_ignore ()
void | Socket_outInitialize (void)
| Initialize the socket module.
void | Socket_outTerminate (void)
| Terminate the socket module.
static int | cmpfds (const void *p1, const void *p2)
static int | cmpsockfds (const void *p1, const void *p2)
SOCKET | Socket_getReadySocket (int more_work, int timeout, mutex_type mutex, int *rc)
| Returns the next socket ready for communications as indicated by select.
int | Socket_getch (SOCKET socket, char *c)
| Reads one byte from a socket.
char * | Socket_getdata (SOCKET socket, size_t bytes, size_t *actual_len, int *rc)
| Attempts to read a number of bytes from a socket, non-blocking.
int | Socket_noPendingWrites (SOCKET socket)
| Indicate whether any data is pending outbound for a socket.
int | Socket_putdatas (SOCKET socket, char *buf0, size_t buf0len, PacketBuffers bufs)
| Attempts to write a series of buffers to a socket in one system call so that they are sent as one packet.
void | Socket_addPendingWrite (SOCKET socket)
| Add a socket to the pending write list, so that it is checked for writing in select.
void | Socket_clearPendingWrite (SOCKET socket)
| Clear a socket from the pending write list - if one was added with Socket_addPendingWrite.
int | Socket_close (SOCKET socket)
| Close a socket and remove it from the select list.
int | Socket_new (const char *addr, size_t addr_len, int port, SOCKET *sock)
| Create a new socket and TCP connect to an address/port.
void | Socket_setWriteContinueCallback (Socket_writeContinue *mywritecontinue)
void | Socket_setWriteCompleteCallback (Socket_writeComplete *mywritecomplete)
void | Socket_setWriteAvailableCallback (Socket_writeAvailable *mywriteavailable)
char * | Socket_getpeer (SOCKET sock)
| Get information about the other end connected to a socket.

## Variables
Sockets | mod_s
| Structure to hold all socket data for this module.
mutex_type | socket_mutex
static Socket_writeContinue * | writecontinue = NULL
static Socket_writeComplete * | writecomplete = NULL
static Socket_writeAvailable * | writeAvailable = NULL

## Detailed Description

Socket related functions.

Some other related functions are in the SocketBuffer module

## Function Documentation

## ◆ isReady()

int isReady | ( | int | index | ) |

Don't accept work from a client unless it is accepting work back, i.e.

its socket is writeable this seems like a reasonable form of flow control, and practically, seems to work.

Parameters

  index | the socket index to check

Returns
  boolean - is the socket ready to go?

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## ◆ Socket_abortWrite()

int Socket_abortWrite | ( | SOCKET | socket | ) |

Continue an outstanding write for a particular socket.

Parameters

  socket | that socket

Returns
  completion code: 0=incomplete, 1=complete, -1=socket error

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## ◆ Socket_addPendingWrite()

void Socket_addPendingWrite | ( | SOCKET | socket | ) |

Add a socket to the pending write list, so that it is checked for writing in select.

This is used in connect processing when the TCP connect is incomplete, as we need to check the socket for both ready to read and write states.

Parameters

  socket | the socket to add

## ◆ Socket_addSocket()

int Socket_addSocket | ( | SOCKET | newSd | ) |

Add a socket to the list of socket to check with select.

Parameters

  newSd | the new socket to add

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## ◆ Socket_clearPendingWrite()

void Socket_clearPendingWrite | ( | SOCKET | socket | ) |

Clear a socket from the pending write list - if one was added with Socket_addPendingWrite.

Parameters

  socket | the socket to remove

## ◆ Socket_close()

int Socket_close | ( | SOCKET | socket | ) |

Close a socket and remove it from the select list.

Parameters

  socket | the socket to close

Returns
  completion code

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## ◆ Socket_close_only()

int Socket_close_only | ( | SOCKET | socket | ) |

Close a socket without removing it from the select list.

Parameters

  socket | the socket to close

Returns
  completion code

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## ◆ Socket_continueWrite()

int Socket_continueWrite | ( | SOCKET | socket | ) |

Continue an outstanding write for a particular socket.

Parameters

  socket | that socket

Returns
  completion code: 0=incomplete, 1=complete, -1=socket error

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## ◆ Socket_continueWrites()

int Socket_continueWrites | ( | SOCKET * | sock,
|  | mutex_type | mutex )

Continue any outstanding socket writes.

Parameters

  sock | in case of a socket error contains the affected socket

Returns
  completion code, 0 or SOCKET_ERROR

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## ◆ Socket_error()

int Socket_error | ( | char * | aString,
|  | SOCKET | sock )

Gets the specific error corresponding to SOCKET_ERROR.

Parameters

  aString | the function that was being used when the error occurred
  sock | the socket on which the error occurred

Returns
  the specific TCP error code

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## ◆ Socket_getaddrname()

char * Socket_getaddrname | ( | struct sockaddr * | sa,
|  | SOCKET | sock )

Convert a numeric address to character string.

Parameters

  sa | socket numerical address
  sock | socket

Returns
  the peer information

maximum length of the address string

maximum length of the port string

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## ◆ Socket_getch()

int Socket_getch | ( | SOCKET | socket,
|  | char * | c )

Reads one byte from a socket.

Parameters

  socket | the socket to read from
  c | the character read, returned

Returns
  completion code

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## ◆ Socket_getdata()

char * Socket_getdata | ( | SOCKET | socket,
|  | size_t | bytes,
|  | size_t * | actual_len,
|  | int * | rc )

Attempts to read a number of bytes from a socket, non-blocking.

If a previous read did not finish, then retrieve that data.

Parameters

  socket | the socket to read from
  bytes | the number of bytes to read
  actual_len | the actual number of bytes read

Returns
  completion code

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## ◆ Socket_getpeer()

char * Socket_getpeer | ( | SOCKET | sock | ) |

Get information about the other end connected to a socket.

Parameters

  sock | the socket to inquire on

Returns
  the peer information

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## ◆ Socket_getReadySocket()

SOCKET Socket_getReadySocket | ( | int | more_work,
|  | int | timeout,
|  | mutex_type | mutex,
|  | int * | rc )

Returns the next socket ready for communications as indicated by select.

Parameters

  more_work | flag to indicate more work is waiting, and thus a timeout value of 0 should be used for the select
  timeout | the timeout to be used in ms
  rc | a value other than 0 indicates an error of the returned socket

Returns
  the socket next ready, or 0 if none is ready

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## ◆ Socket_new()

int Socket_new | ( | const char * | addr,
|  | size_t | addr_len,
|  | int | port,
|  | SOCKET * | sock )

Create a new socket and TCP connect to an address/port.

Parameters

  addr | the address string
  assr_len | the length of the address string
  port | the TCP port
  sock | returns the new socket
  timeout | the timeout in milliseconds

Returns
  completion code 0=good, SOCKET_ERROR=fail

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## ◆ Socket_noPendingWrites()

int Socket_noPendingWrites | ( | SOCKET | socket | ) |

Indicate whether any data is pending outbound for a socket.

Returns
  boolean - true == no pending data.

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## ◆ Socket_putdatas()

int Socket_putdatas | ( | SOCKET | socket,
|  | char * | buf0,
|  | size_t | buf0len,
|  | PacketBuffers | bufs )

Attempts to write a series of buffers to a socket in one system call so that they are sent as one packet.

Parameters

  socket | the socket to write to
  buf0 | the first buffer
  buf0len | the length of data in the first buffer
  count | number of buffers
  buffers | an array of buffers to write
  buflens | an array of corresponding buffer lengths

Returns
  completion code, especially TCPSOCKET_INTERRUPTED

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## ◆ Socket_setnonblocking()

int Socket_setnonblocking | ( | SOCKET | sock | ) |

Set a socket non-blocking, OS independently.

Parameters

  sock | the socket to set non-blocking

Returns
  TCP call error code

## ◆ Socket_writev()

int Socket_writev | ( | SOCKET | socket,
|  | iobuf * | iovecs,
|  | int | count,
|  | unsigned long * | bytes )

Attempts to write a series of iovec buffers to a socket in one system call so that they are sent as one packet.

Parameters

  socket | the socket to write to
  iovecs | an array of buffers to write
  count | number of buffers in iovecs
  bytes | number of bytes actually written returned

Returns
  completion code, especially TCPSOCKET_INTERRUPTED

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