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The412Banner
4022351e22
Lifts Bannerlator's Linux/gamescope runtime out into an app of its own: the Wayland compositor, the proot session, the runtime installer, the fake-evdev controller path and the PulseAudio server, with none of the Wine, container or store machinery around them. One activity installs the runtime from the same winlator-contents catalog and a second one runs the session: compositor on a SurfaceView, gamescope and Valve's native arm64 client under proot, a physical pad republished into the fake-input rings, and the session's milestones on screen until the first frame arrives.
104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
/*
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* Ported from WinNative (maxjivi05, feature/wayland-gamescope, 2026-09-18/19), GPL-3.0, with names
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* changed to this project's. The reasoning below is the original author's.
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*
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* A process status without the container's tracer in it.
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*
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* proot runs the session under ptrace, so every process here reads a TracerPid in its
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* /proc/<pid>/status. The Steam client takes that to mean a debugger is attached, and its arm64
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* build breaks into the supposed debugger with a bare "svc #0" after every failed assertion. That
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* is no breakpoint: the registers still hold the call Plat_IsInDebugSession() just made, close(),
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* with its own result, 1, as the argument - so each assertion closes descriptor 1. The number then
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* goes to whatever the client opens next, and its standard output is written into that: app
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* manifests and content chunks, its own connections, and the socket a game's Steam API talks
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* over, which is how a game that stayed silent while loading found its pipe dead.
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*
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* The tracer is part of the container, not something a program should react to, so the status
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* files are served with TracerPid 0.
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*/
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#define _GNU_SOURCE
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#define STATUS_MAX 16384
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#define TRACER_FIELD "\nTracerPid:\t"
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static const char *skip_digits(const char *s) {
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const char *end = s;
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while (isdigit((unsigned char)*end)) end++;
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return end == s ? NULL : end;
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}
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/* /proc/{self,thread-self,<pid>}[/task/<tid>]/status */
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static int is_status_path(const char *path) {
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const char *rest;
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if (path == NULL || strncmp(path, "/proc/", 6) != 0) return 0;
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path += 6;
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if (strncmp(path, "self/", 5) == 0) rest = path + 4;
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else if (strncmp(path, "thread-self/", 12) == 0) rest = path + 11;
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else if ((rest = skip_digits(path)) == NULL) return 0;
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if (strncmp(rest, "/task/", 6) == 0 && (rest = skip_digits(rest + 6)) == NULL) return 0;
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return strcmp(rest, "/status") == 0;
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}
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/* Chromium stands its hang watchdogs down when it sees a tracer, and the client's web helper does
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* not come up within their patience here: it is left reading the truth. */
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static int is_web_helper(void) {
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return strcmp(program_invocation_short_name, "steamwebhelper") == 0;
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}
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static int write_all(int fd, const char *data, size_t len) {
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while (len > 0) {
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ssize_t n = write(fd, data, len);
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if (n < 0 && errno == EINTR) continue;
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if (n <= 0) return -1;
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data += n;
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len -= (size_t)n;
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}
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return 0;
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}
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/* The descriptor to hand back for a read-only open of a status file, or -1 with errno untouched
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* when the path is something else or the copy cannot be made, and the real open should run. */
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__attribute__((visibility("hidden"))) int bl_status_without_tracer(const char *path, int flags) {
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char text[STATUS_MAX];
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size_t len = 0;
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int saved = errno;
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int out = -1;
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if ((flags & O_ACCMODE) != O_RDONLY || !is_status_path(path) || is_web_helper()) return -1;
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int in = (int)syscall(SYS_openat, AT_FDCWD, path, O_RDONLY | O_CLOEXEC);
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if (in < 0) goto done;
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for (;;) {
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ssize_t n = read(in, text + len, sizeof(text) - 1 - len);
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if (n < 0 && errno == EINTR) continue;
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if (n <= 0) break;
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len += (size_t)n;
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}
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close(in);
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text[len] = '\0';
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char *field = strstr(text, TRACER_FIELD);
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if (field == NULL) goto done;
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char *value = field + strlen(TRACER_FIELD);
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char *line_end = strchr(value, '\n');
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if (line_end == NULL) goto done;
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out = memfd_create("status", (flags & O_CLOEXEC) ? MFD_CLOEXEC : 0);
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if (out < 0) goto done;
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if (write_all(out, text, (size_t)(value - text)) != 0 || write_all(out, "0", 1) != 0
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|| write_all(out, line_end, len - (size_t)(line_end - text)) != 0
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|| lseek(out, 0, SEEK_SET) != 0) {
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close(out);
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out = -1;
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}
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done:
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errno = saved;
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return out;
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}
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