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Implement magiskinit logging in Rust

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topjohnwu
2023-05-02 16:49:43 -07:00
parent 0d84f80b3c
commit b136aba1e2
8 changed files with 84 additions and 83 deletions
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51
native/src/init/getinfo.cpp
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@@ -117,55 +117,6 @@ static bool check_key_combo() {
return false;
}
static FILE *kmsg;
extern "C" void klog_write(const char *msg, int len) {
fprintf(kmsg, "%.*s", len, msg);
}
static int klog_with_rs(LogLevel level, const char *fmt, va_list ap) {
char buf[4096];
strscpy(buf, "magiskinit: ", sizeof(buf));
int len = vssprintf(buf + 12, sizeof(buf) - 12, fmt, ap) + 12;
log_with_rs(level, rust::Str(buf, len));
return len;
}
void setup_klog() {
// Shut down first 3 fds
int fd;
if (access("/dev/null", W_OK) == 0) {
fd = xopen("/dev/null", O_RDWR | O_CLOEXEC);
} else {
mknod("/null", S_IFCHR | 0666, makedev(1, 3));
fd = xopen("/null", O_RDWR | O_CLOEXEC);
unlink("/null");
}
xdup3(fd, STDIN_FILENO, O_CLOEXEC);
xdup3(fd, STDOUT_FILENO, O_CLOEXEC);
xdup3(fd, STDERR_FILENO, O_CLOEXEC);
if (fd > STDERR_FILENO)
close(fd);
if (access("/dev/kmsg", W_OK) == 0) {
fd = xopen("/dev/kmsg", O_WRONLY | O_CLOEXEC);
} else {
mknod("/kmsg", S_IFCHR | 0666, makedev(1, 11));
fd = xopen("/kmsg", O_WRONLY | O_CLOEXEC);
unlink("/kmsg");
}
kmsg = fdopen(fd, "w");
setbuf(kmsg, nullptr);
rust::setup_klog();
cpp_logger = klog_with_rs;
// Disable kmsg rate limiting
if (FILE *rate = fopen("/proc/sys/kernel/printk_devkmsg", "w")) {
fprintf(rate, "on\n");
fclose(rate);
}
}
void BootConfig::set(const kv_pairs &kv) {
for (const auto &[key, value] : kv) {
if (key == "androidboot.slot_suffix") {
@@ -231,7 +182,7 @@ void load_kernel_info(BootConfig *config) {
mount_list.emplace_back("/sys");
// Log to kernel
setup_klog();
rust::setup_klog();
config->set(parse_cmdline(full_read("/proc/cmdline")));
config->set(parse_bootconfig(full_read("/proc/bootconfig")));