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2019-08-28 12:41:24 +02:00
libipc(7)
# NAME
libipc - Simple, easy-to-use IPC library
# DESCRIPTION
**libipc** is a library that provides interprocess communication medium between applications.
It provides both client and server code.
# SYNOPSIS
**#include <ipc.h>**
## Initialization, exchanges, disconnection
// server initialization
_enum ipc_errors_ **ipc_server_init** (*char* \*\*env , *struct ipc_connection_info* \*srv, *const char* \*sname);
// connection establishement to a server
_enum ipc_errors_ **ipc_connection** (*char* \*\*env, *struct ipc_connection_info* \*, *const char* \*);
// closing a server
_enum ipc_errors_ **ipc_server_close** (*struct ipc_connection_info* \*srv);
// closing a connection
_enum ipc_errors_ **ipc_close** (*struct ipc_connection_info* \*p);++
_enum ipc_errors_ **ipc_accept** (*struct ipc_connection_info* \*srv, *struct ipc_connection_info* \*p);
_enum ipc_errors_ **ipc_read** (*const struct ipc_connection_info* \*, *struct ipc_message* \*m);++
_enum ipc_errors_ **ipc_write** (*const struct ipc_connection_info* \*, *const struct ipc_message* \*m);++
_enum ipc_errors_ **ipc_wait_event** (*struct ipc_connection_infos* \*clients, *struct ipc_connection_info* \*srv, *struct ipc_event* \*event);
// store and remove only pointers on allocated structures
_enum ipc_errors_ **ipc_add** (*struct ipc_connection_infos* \*cinfos, *struct ipc_connection_info* \*cinfo);++
_enum ipc_errors_ **ipc_del** (*struct ipc_connection_infos* \*cinfos, *struct ipc_connection_info* \*cinfo);
// add an arbitrary file descriptor to read
_enum ipc_errors_ **ipc_add_fd** (*struct ipc_connection_infos* \*cinfos, *int* fd);
## Message functions
// create msg structure from buffer
_enum ipc_errors_ **ipc_message_format_read** (*struct ipc_message* \*m, *const char* \*buf, *ssize_t* msize);
// create buffer from msg structure
_enum ipc_errors_ **ipc_message_format_write** (*const struct ipc_message* \*m, *char* \*\*buf, *ssize_t* \*msize);
_enum ipc_errors_ **ipc_message_format** (*struct ipc_message* \*m, *char* type, *const char* \*payload, *ssize_t* length);++
_enum ipc_errors_ **ipc_message_format_data** (*struct ipc_message* \*m, *const char* \*payload, *ssize_t* length);++
_enum ipc_errors_ **ipc_message_format_server_close** (*struct ipc_message* \*m);
_enum ipc_errors_ **ipc_message_empty** (*struct ipc_message* \*m);
# STRUCTURES
```
struct ipc_connection_info {
uint32_t version;
uint32_t index;
int32_t fd;
char type; // may be an arbitrary fd
char *spath; // max size: PATH_MAX, used to store unix socket path
};
struct ipc_connection_infos {
struct ipc_connection_info ** cinfos;
int32_t size;
};
struct ipc_message {
char type;
uint32_t length;
char *payload;
};
struct ipc_event {
enum ipc_event_type type;
void* origin; // currently used as an client or service pointer
void* m; // message pointer
};
```
# ENUMERATIONS
```
enum msg_types {
MSG_TYPE_SERVER_CLOSE = 0
, MSG_TYPE_ERR
, MSG_TYPE_DATA
} message_types;
```
Function **ipc_wait_event** returns an *event type* structure.\
The event may be a (dis)connection, received data or an error.\
It also can be *IPC_EVENT_TYPE_EXTRA_SOCKET* since an arbitrary file descriptor can be added to the *ipc_connection_infos* structure with **ipc_add_fd**.
```
enum ipc_event_type {
IPC_EVENT_TYPE_NOT_SET
, IPC_EVENT_TYPE_ERROR
, IPC_EVENT_TYPE_EXTRA_SOCKET
, IPC_EVENT_TYPE_CONNECTION
, IPC_EVENT_TYPE_DISCONNECTION
, IPC_EVENT_TYPE_MESSAGE
};
enum ipc_errors {
...
};
```
# EXAMPLES
Examples are available in the */examples* directory.
# NOTES
# SEE ALSO
# BUGS & LIMITATIONS
- Documentation is currently limited.
- Tests are currently limited.
- No code audit has been made.