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Magisk
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Make logging less error prone

This commit is contained in:
topjohnwu 2020-12-06 23:09:24 -08:00
parent aabe2696fe
commit c62dfc1bcc
1 changed files with 23 additions and 14 deletions
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37
native/jni/core/daemon.cpp
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@ -134,31 +134,32 @@ shortcut:
close(client);
}
static FILE *log_file;
static shared_ptr<FILE> log_file;
bool in_mem_log = true;
atomic_flag file_backed = ATOMIC_FLAG_INIT;
static char *log_buf;
static size_t log_buf_len;
void setup_logfile(bool reset) {
if (!in_mem_log)
if (file_backed.test_and_set(memory_order_relaxed))
return;
in_mem_log = false;
if (reset)
rename(LOGFILE, LOGFILE ".bak");
int fd = xopen(LOGFILE, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0644);
// Dump all logs in memory (if exists)
if (log_buf) {
write(fd, log_buf, log_buf_len);
if (fd < 0) {
log_file.reset();
return;
}
// Redirect to log file
log_file = fdopen(fd, "a");
setbuf(log_file, nullptr);
// Dump all logs in memory (if exists)
if (log_buf)
write(fd, log_buf, log_buf_len);
free(log_buf);
if (FILE *fp = fdopen(fd, "a")) {
setbuf(fp, nullptr);
log_file.reset(fp, &fclose);
}
}
static int magisk_log(int prio, const char *fmt, va_list ap) {
@ -168,6 +169,10 @@ static int magisk_log(int prio, const char *fmt, va_list ap) {
// Log to logcat
__android_log_vprint(prio, "Magisk", fmt, ap);
auto local_log_file = log_file;
if (!local_log_file)
return 0;
char buf[4096];
timeval tv;
tm tm;
@ -192,11 +197,15 @@ static int magisk_log(int prio, const char *fmt, va_list ap) {
int ms = tv.tv_usec / 1000;
len += sprintf(buf + len, ".%03d %c : ", ms, type);
strcpy(buf + len, fmt);
return vfprintf(log_file, buf, args);
return vfprintf(local_log_file.get(), buf, args);
}
static void android_logging() {
log_file = make_stream_fp<byte_stream>(log_buf, log_buf_len).release();
auto in_mem_file = make_stream_fp<byte_stream>(log_buf, log_buf_len);
log_file.reset(in_mem_file.release(), [](FILE *) {
free(log_buf);
log_buf = nullptr;
});
log_cb.d = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_DEBUG, fmt, ap); };
log_cb.i = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_INFO, fmt, ap); };
log_cb.w = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_WARN, fmt, ap); };