libdill: Structured Concurrency for C

NAME

ipc_listen_mem - starts listening for incoming IPC connections

SYNOPSIS

#include <libdill.h>

int ipc_listen_mem(
    const char* addr,
    int backlog,
    struct ipc_listener_storage* mem);

DESCRIPTION

IPC protocol is a bytestream protocol for transporting data among processes on the same machine. It is an equivalent to POSIX AF_LOCAL sockets.

This function starts listening for incoming IPC connections. The connections can be accepted using ipc_accept function.

This function allows to avoid one dynamic memory allocation by storing the object in user-supplied memory. Unless you are hyper-optimizing use ipc_listen instead.

addr: The filename to listen on.

backlog: Maximum number of connections that can be kept open without accepting them.

mem: The structure to store the newly created object in. It must not be deallocated before the object is closed.

The socket can be closed either by hclose or ipc_close. Both ways are equivalent.

This function is not available if libdill is compiled with --disable-sockets option.

RETURN VALUE

In case of success the function returns newly created socket. In case of error it returns -1 and sets errno to one of the values below.

ERRORS

EACCES: The process does not have appropriate privileges.
EADDRINUSE: The specified address is already in use.
EINVAL: Invalid argument.
ELOOP: A loop exists in symbolic links encountered during resolution of the pathname in address.
EMFILE: The maximum number of file descriptors in the process are already open.
ENAMETOOLONG: A component of a pathname exceeded NAME_MAX characters, or an entire pathname exceeded PATH_MAX characters.
ENFILE: The maximum number of file descriptors in the system are already open.
ENOENT: A component of the pathname does not name an existing file or the pathname is an empty string.
ENOMEM: Not enough memory.
ENOTDIR: A component of the path prefix of the pathname in address is not a directory.

EXAMPLE

int ls = ipc_listen("/tmp/test.ipc", 10);
int s = ipc_accept(ls, -1);
bsend(s, "ABC", 3, -1);
char buf[3];
brecv(s, buf, sizeof(buf), -1);
ipc_close(s);
ipc_close(ls);