Created
June 26, 2025 12:52
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CAN Socket in Zig
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| const std = @import("std"); | |
| const c = @cImport({ | |
| @cInclude("linux/can.h"); | |
| }); | |
| const page_allocator = std.heap.page_allocator; | |
| const Allocator = std.mem.Allocator; | |
| const can_frame = extern struct { | |
| can_id: u32, | |
| len: u8, | |
| pad: u8 = 0, | |
| res0: u8 = 0, | |
| len8_dlc: u8 = 0, | |
| data: [8]u8 = [8]u8{ 0, 0, 0, 0, 0, 0, 0, 0 }, | |
| }; | |
| pub fn main() !void { | |
| var s = std.os.socket(std.os.AF.CAN, std.os.SOCK.RAW, 1) catch |err| return err; | |
| var idx = std.c.if_nametoindex("can0"); | |
| var sa: c.sockaddr_can = undefined; | |
| @memset(@ptrCast([*]u8, &sa)[0..@sizeOf(c.sockaddr_can)], 0); | |
| sa.can_family = std.os.AF.CAN; | |
| sa.can_ifindex = idx; | |
| try std.os.bind(s, @ptrCast(*std.os.linux.sockaddr, &sa), @sizeOf(c.sockaddr_can)); | |
| var frame = can_frame{ | |
| .can_id = 0x1000D101 | (@as(u32, 1) << 31), | |
| .len = 2, | |
| }; | |
| frame.data[0] = 0xAA; | |
| frame.data[1] = 0xBB; | |
| _ = try std.os.write(s, @ptrCast([*]const u8, &frame)[0..@sizeOf(can_frame)]); | |
| // -or- | |
| _ = try std.os.write(s, std.mem.asBytes(&frame)); | |
| } |
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