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const std = @import("std");
const posix = std.posix;
const linux = std.os.linux;
extern "c" fn forkpty(
amaster: *c_int,
name: ?[*:0]u8,
termp: ?*const anyopaque,
winp: ?*const posix.winsize,
) c_int;
extern "c" fn execvp(file: [*:0]const u8, argv: [*:null]const ?[*:0]const u8) c_int;
extern "c" fn _exit(status: c_int) noreturn;
fn writeAll(fd: c_int, bytes: []const u8) !void {
var off: usize = 0;
while (off < bytes.len) {
const rc = linux.write(fd, bytes[off..].ptr, bytes.len - off);
switch (posix.errno(rc)) {
.SUCCESS => off += @intCast(rc),
.INTR => {},
else => |err| {
std.debug.print("write failed: {}\n", .{err});
return error.WriteFailed;
},
}
}
}
fn waitNoHang(pid: c_int) bool {
var status: u32 = 0;
const rc = linux.waitpid(pid, &status, linux.W.NOHANG);
return posix.errno(rc) == .SUCCESS and rc == @as(usize, @intCast(pid));
}
pub fn main(init: std.process.Init) !void {
const gpa = init.gpa;
const args = try init.minimal.args.toSlice(init.arena.allocator());
if (args.len != 2) {
std.debug.print("usage: {s} <pardes-exe>\n", .{args[0]});
return error.BadArgs;
}
const exe = args[1];
const marker = "PARDES_E2E";
const command = "echo " ++ marker ++ "\r";
var master: c_int = undefined;
const ws = posix.winsize{ .row = 24, .col = 80, .xpixel = 0, .ypixel = 0 };
const pid = forkpty(&master, null, null, &ws);
if (pid == 0) {
const child_argv = [_:null]?[*:0]const u8{ exe.ptr, null };
_ = execvp(exe.ptr, &child_argv);
_exit(127);
}
defer _ = linux.close(master);
defer posix.kill(pid, posix.SIG.KILL) catch {};
var output: std.ArrayList(u8) = .empty;
defer output.deinit(gpa);
var buf: [4096]u8 = undefined;
for (0..20) |_| {
var fds = [_]posix.pollfd{.{
.fd = master,
.events = posix.POLL.IN,
.revents = 0,
}};
_ = try posix.poll(&fds, 100);
if ((fds[0].revents & posix.POLL.IN) != 0) {
const n = posix.read(master, &buf) catch break;
if (n == 0) break;
try output.appendSlice(gpa, buf[0..n]);
break;
}
}
try writeAll(master, command);
var saw_marker = false;
for (0..80) |_| {
var fds = [_]posix.pollfd{.{
.fd = master,
.events = posix.POLL.IN,
.revents = 0,
}};
_ = try posix.poll(&fds, 100);
if ((fds[0].revents & (posix.POLL.IN | posix.POLL.HUP | posix.POLL.ERR)) != 0) {
const n = posix.read(master, &buf) catch break;
if (n == 0) break;
try output.appendSlice(gpa, buf[0..n]);
if (std.mem.containsAtLeast(u8, output.items, 1, marker)) {
saw_marker = true;
break;
}
}
if (waitNoHang(pid)) break;
}
try writeAll(master, "\x03");
for (0..20) |_| {
if (waitNoHang(pid)) break;
var fds = [_]posix.pollfd{.{
.fd = master,
.events = posix.POLL.IN,
.revents = 0,
}};
_ = posix.poll(&fds, 50) catch {};
if ((fds[0].revents & posix.POLL.IN) != 0) {
_ = posix.read(master, &buf) catch 0;
}
}
if (!saw_marker) {
std.debug.print("app did not render marker; captured {d} bytes:\n{s}\n", .{
output.items.len,
output.items[0..@min(output.items.len, 4096)],
});
return error.MarkerNotRendered;
}
}
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