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