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man/libipc.7
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183
man/libipc.7
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.\" Generated by scdoc 1.9.6
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.ie \n(.g .ds Aq \(aq
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.\" Begin generated content:
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.TH "libipc" "7" "2020-12-08"
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.P
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.SH NAME
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.P
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libipc - Simple, easy-to-use IPC library
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.P
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.SH DESCRIPTION
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.P
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\fB\fRlibipc\fB\fR 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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.P
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.SH SYNOPSIS
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.P
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\fB\fR#include <ipc.h>\fB\fR
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.P
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.SS Initialization, exchanges, disconnection
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.P
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// server initialization
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.P
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\fIenum ipc_errors\fR \fB\fRipc_server_init\fB\fR (\fBchar\fR **env, \fBconst char\fR *sname);
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.P
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// connection establishement to a server
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.P
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\fIenum ipc_errors\fR \fB\fRipc_connection\fB\fR (\fBchar\fR **env, \fBconst char\fR *, int *serverfd);
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.P
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// closing a server
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.P
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\fIenum ipc_errors\fR \fB\fRipc_close\fB\fR (\fBstruct ipc_connection_info\fR *srv);
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.P
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// closing a connection
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.P
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\fIenum ipc_errors\fR \fB\fRipc_close\fB\fR (\fBstruct ipc_connection_info\fR *p);
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.br
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\fIenum ipc_errors\fR \fB\fRipc_accept\fB\fR (\fBstruct ipc_connection_info\fR *srv, \fBstruct ipc_connection_info\fR *p);
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.P
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\fIenum ipc_errors\fR \fB\fRipc_read\fB\fR (\fBconst struct ipc_connection_info\fR *, \fBstruct ipc_message\fR *m);
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.br
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\fIenum ipc_errors\fR \fB\fRipc_write\fB\fR (\fBconst struct ipc_connection_info\fR *, \fBconst struct ipc_message\fR *m);
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.br
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\fIenum ipc_errors\fR \fB\fRipc_wait_event\fB\fR (\fBstruct ipc_ctx\fR *clients, \fBstruct ipc_connection_info\fR *srv, \fBstruct ipc_event\fR *event);
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.P
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.P
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// store and remove only pointers on allocated structures
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.P
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\fIenum ipc_errors\fR \fB\fRipc_add\fB\fR (\fBstruct ipc_ctx\fR *cinfos, \fBstruct ipc_connection_info\fR *cinfo);
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.br
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\fIenum ipc_errors\fR \fB\fRipc_del\fB\fR (\fBstruct ipc_ctx\fR *cinfos, \fBstruct ipc_connection_info\fR *cinfo);
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.P
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// add an arbitrary file descriptor to read
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.P
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\fIenum ipc_errors\fR \fB\fRipc_add_fd\fB\fR (\fBstruct ipc_ctx\fR *cinfos, \fBint\fR fd);
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.P
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.P
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.SS Message functions
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.P
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// create msg structure from buffer
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.P
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\fIenum ipc_errors\fR \fB\fRipc_message_format_read\fB\fR (\fBstruct ipc_message\fR *m, \fBconst char\fR *buf, \fBssize_t\fR msize);
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.P
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// create buffer from msg structure
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.P
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\fIenum ipc_errors\fR \fB\fRipc_message_format_write\fB\fR (\fBconst struct ipc_message\fR *m, \fBchar\fR **buf, \fBssize_t\fR *msize);
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.P
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\fIenum ipc_errors\fR \fB\fRipc_message_format\fB\fR (\fBstruct ipc_message\fR *m, \fBchar\fR type, \fBconst char\fR *payload, \fBssize_t\fR length);
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.br
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\fIenum ipc_errors\fR \fB\fRipc_message_format_data\fB\fR (\fBstruct ipc_message\fR *m, \fBconst char\fR *payload, \fBssize_t\fR length);
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.br
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\fIenum ipc_errors\fR \fB\fRipc_message_format_server_close\fB\fR (\fBstruct ipc_message\fR *m);
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.P
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\fIenum ipc_errors\fR \fB\fRipc_message_empty\fB\fR (\fBstruct ipc_message\fR *m);
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.P
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.P
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.SH STRUCTURES
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.P
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.nf
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.RS 4
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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_ctx {
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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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.fi
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.RE
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.P
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.P
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.SH ENUMERATIONS
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.P
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.nf
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.RS 4
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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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.fi
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.RE
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.P
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Function \fB\fRipc_wait_event\fB\fR returns an \fBevent type\fR 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 \fBIPC_EVENT_TYPE_EXTRA_SOCKET\fR since an arbitrary file descriptor can be added to the \fBipc_ctx\fR structure with \fB\fRipc_add_fd\fB\fR.
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.P
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.nf
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.RS 4
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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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.fi
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.RE
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.P
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.P
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.SH EXAMPLES
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.P
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Examples are available in the \fB/examples\fR directory.
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.P
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.SH NOTES
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.P
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.SH SEE ALSO
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.P
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.SH BUGS & LIMITATIONS
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.P
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.IP \(bu 4
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.\}
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Documentation is currently limited.
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.RE
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.IP \(bu 4
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.\}
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Tests are currently limited.
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.RE
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.IP \(bu 4
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.\}
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No code audit has been made.
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.RE
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.P
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