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libipc-old
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libipc-old/zig-impl/other/rcv-fd.zig

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Zig

const std = @import("std");
const net = std.net;
const print = std.debug.print;
const receive_fd = @import("./exchange-fd.zig").receive_fd;
fn disconnect(stream: *net.StreamServer) void { stream.close(); }
fn server_init() net.StreamServer {
// no reuse_address and default kernel_backlog
return net.StreamServer.init(.{});
}
fn waiting_for_connection(stream: *net.StreamServer
, path: []const u8) !net.StreamServer.Connection {
var address = try net.Address.initUnix(path);
try stream.listen(address);
return stream.accept();
}
fn remove_unix_socket(path: []const u8) void {
std.fs.deleteFileAbsolute(path) catch |err| switch(err) {
else => { print("error: {}\n", .{err}); }
};
}
fn add_line_from_fd(fd: i32) !void {
_ = try std.os.write(fd, "SECOND LINE\n");
std.os.close(fd);
}
pub fn main() !u8 {
var path = "/tmp/TEST_EXCHANGE_FD";
print("Init UNIX server to {s}...\n", .{path});
var stream = server_init();
defer stream.deinit();
print("Waiting for a connection...\n", .{});
var connection = try waiting_for_connection(&stream, path);
defer remove_unix_socket(path);
print("Someone is connected! Receiving a file descriptor...\n", .{});
var msgbuffer: [1500]u8 = undefined;
var msgsize: usize = 0;
var fd = try receive_fd(connection.stream.handle, msgbuffer[0..], &msgsize);
print("received fd: {}, payload: {s}\n", .{fd, msgbuffer[0..msgsize - 1]});
print("FD received, writing a line into the file...\n", .{});
try add_line_from_fd(fd);
print("Disconnection...\n", .{});
disconnect(&stream);
print("Disconnected!\n", .{});
return 0;
}