mirror of
https://github.com/Droid-Deck/DroidDeck.git
synced 2026-11-12 19:41:10 +00:00
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
|
|
* Ported from WinNative (maxjivi05, feature/wayland-gamescope, 2026-09-18/19), GPL-3.0.
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/syscall.h>
|
|
#include <unistd.h>
|
|
|
|
#define STATUS_MAX 16384
|
|
#define TRACER_FIELD "\nTracerPid:\t"
|
|
|
|
static const char *skip_digits(const char *s) {
|
|
const char *end = s;
|
|
while (isdigit((unsigned char)*end)) end++;
|
|
return end == s ? NULL : end;
|
|
}
|
|
|
|
static int is_status_path(const char *path) {
|
|
const char *rest;
|
|
if (path == NULL || strncmp(path, "/proc/", 6) != 0) return 0;
|
|
path += 6;
|
|
if (strncmp(path, "self/", 5) == 0) rest = path + 4;
|
|
else if (strncmp(path, "thread-self/", 12) == 0) rest = path + 11;
|
|
else if ((rest = skip_digits(path)) == NULL) return 0;
|
|
if (strncmp(rest, "/task/", 6) == 0 && (rest = skip_digits(rest + 6)) == NULL) return 0;
|
|
return strcmp(rest, "/status") == 0;
|
|
}
|
|
|
|
static int is_web_helper(void) {
|
|
return strcmp(program_invocation_short_name, "steamwebhelper") == 0 ||
|
|
strcmp(program_invocation_short_name, "vrwebhelper") == 0;
|
|
}
|
|
|
|
static int write_all(int fd, const char *data, size_t len) {
|
|
while (len > 0) {
|
|
ssize_t n = write(fd, data, len);
|
|
if (n < 0 && errno == EINTR) continue;
|
|
if (n <= 0) return -1;
|
|
data += n;
|
|
len -= (size_t)n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
__attribute__((visibility("hidden"))) int bl_status_without_tracer(const char *path, int flags) {
|
|
char text[STATUS_MAX];
|
|
size_t len = 0;
|
|
int saved = errno;
|
|
int out = -1;
|
|
|
|
if ((flags & O_ACCMODE) != O_RDONLY || !is_status_path(path) || is_web_helper()) return -1;
|
|
int in = (int)syscall(SYS_openat, AT_FDCWD, path, O_RDONLY | O_CLOEXEC);
|
|
if (in < 0) goto done;
|
|
for (;;) {
|
|
ssize_t n = read(in, text + len, sizeof(text) - 1 - len);
|
|
if (n < 0 && errno == EINTR) continue;
|
|
if (n <= 0) break;
|
|
len += (size_t)n;
|
|
}
|
|
close(in);
|
|
text[len] = '\0';
|
|
|
|
char *field = strstr(text, TRACER_FIELD);
|
|
if (field == NULL) goto done;
|
|
char *value = field + strlen(TRACER_FIELD);
|
|
char *line_end = strchr(value, '\n');
|
|
if (line_end == NULL) goto done;
|
|
|
|
out = memfd_create("status", (flags & O_CLOEXEC) ? MFD_CLOEXEC : 0);
|
|
if (out < 0) goto done;
|
|
if (write_all(out, text, (size_t)(value - text)) != 0 || write_all(out, "0", 1) != 0
|
|
|| write_all(out, line_end, len - (size_t)(line_end - text)) != 0
|
|
|| lseek(out, 0, SEEK_SET) != 0) {
|
|
close(out);
|
|
out = -1;
|
|
}
|
|
done:
|
|
errno = saved;
|
|
return out;
|
|
}
|