MQTT C Client Libraries Internals: MQTTPersistenceDefault.c File Reference

| MQTT C Client Libraries Internals

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MQTTPersistenceDefault.c File Reference

A file system based persistence implementation. More...

`#include "OsWrapper.h"`
`#include <stdio.h>`
`#include <string.h>`
`#include <errno.h>`
`#include <sys/stat.h>`
`#include <dirent.h>`
`#include <unistd.h>`
`#include "MQTTClientPersistence.h"`
`#include "MQTTPersistenceDefault.h"`
`#include "StackTrace.h"`
`#include "Heap.h"`
Include dependency graph for MQTTPersistenceDefault.c:

## Functions
int | keysUnix (char *, char ***, int *)
int | clearUnix (char *)
int | containskeyUnix (char *, char *)
int | pstopen (void **handle, const char *clientID, const char *serverURI, void *context)
| Create persistence directory for the client: context/clientID-serverURI.
int | pstmkdir (char *pPathname)
| Function to create a directory.
int | pstput (void *handle, char *key, int bufcount, char *buffers[], int buflens[])
| Write wire message to the client persistence directory.
int | pstget (void *handle, char *key, char **buffer, int *buflen)
| Retrieve a wire message from the client persistence directory.
int | pstremove (void *handle, char *key)
| Delete a persisted message from the client persistence directory.
int | pstclose (void *handle)
| Delete client persistence directory (if empty).
int | pstcontainskey (void *handle, char *key)
| Returns whether if a wire message is persisted in the client persistence directory.
int | pstclear (void *handle)
| Delete all the persisted message in the client persistence directory.
int | pstkeys (void *handle, char ***keys, int *nkeys)
| Returns the keys (file names w/o the extension) in the client persistence directory.

## Detailed Description

A file system based persistence implementation.

A directory is specified when the MQTT client is created. When the persistence is then opened (see Persistence_open), a sub-directory is made beneath the base for this particular client ID and connection key. This allows one persistence base directory to be shared by multiple clients.

## Function Documentation

## ◆ pstclear()

int pstclear | ( | void * | handle | ) |

Delete all the persisted message in the client persistence directory.

See Persistence_clear

## ◆ pstclose()

int pstclose | ( | void * | handle | ) |

Delete client persistence directory (if empty).

See Persistence_close

## ◆ pstcontainskey()

int pstcontainskey | ( | void * | handle,
|  | char * | key )

Returns whether if a wire message is persisted in the client persistence directory.

See Persistence_containskey

## ◆ pstget()

int pstget | ( | void * | handle,
|  | char * | key,
|  | char ** | buffer,
|  | int * | buflen )

Retrieve a wire message from the client persistence directory.

See Persistence_get

## ◆ pstkeys()

int pstkeys | ( | void * | handle,
|  | char *** | keys,
|  | int * | nkeys )

Returns the keys (file names w/o the extension) in the client persistence directory.

See Persistence_keys

## ◆ pstmkdir()

int pstmkdir | ( | char * | pPathname | ) |

Function to create a directory.

Returns 0 on success or if the directory already exists.

## ◆ pstopen()

int pstopen | ( | void ** | handle,
|  | const char * | clientID,
|  | const char * | serverURI,
|  | void * | context )

Create persistence directory for the client: context/clientID-serverURI.

See Persistence_open

Here is the call graph for this function:

## ◆ pstput()

int pstput | ( | void * | handle,
|  | char * | key,
|  | int | bufcount,
|  | char * | buffers[],
|  | int | buflens[] )

Write wire message to the client persistence directory.

See Persistence_put

Here is the call graph for this function:

## ◆ pstremove()

int pstremove | ( | void * | handle,
|  | char * | key )

Delete a persisted message from the client persistence directory.

See Persistence_remove