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Sleep when there is nothing to wait

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This commit is contained in:
topjohnwu 2019-05-25 18:17:25 -07:00
parent 21984fac8b
commit bb15671046
1 changed files with 17 additions and 9 deletions
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26
native/jni/magiskhide/proc_monitor.cpp
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@ -70,19 +70,15 @@ static int parse_ppid(int pid) {
return ppid;
}
static long xptrace(bool log, int request, pid_t pid, void *addr, void *data) {
static inline long xptrace(int request, pid_t pid, void *addr, void *data) {
long ret = ptrace(request, pid, addr, data);
if (log && ret == -1)
if (ret < 0)
PLOGE("ptrace %d", pid);
return ret;
}
static long xptrace(int request, pid_t pid, void *addr, void *data) {
return xptrace(true, request, pid, addr, data);
}
static long xptrace(int request, pid_t pid, void *addr = nullptr, intptr_t data = 0) {
return xptrace(true, request, pid, addr, reinterpret_cast<void *>(data));
static inline long xptrace(int request, pid_t pid, void *addr = nullptr, intptr_t data = 0) {
return xptrace(request, pid, addr, reinterpret_cast<void *>(data));
}
static bool parse_packages_xml(string_view s) {
@ -254,6 +250,7 @@ static void inotify_event(int) {
uid_proc_map.clear();
file_readline("/data/system/packages.xml", parse_packages_xml, true);
} else if (event->mask & IN_ACCESS) {
LOGD("proc_monitor: app_process access\n");
check_zygote();
}
}
@ -409,8 +406,19 @@ void proc_monitor() {
for (;;) {
const int pid = waitpid(-1, &status, __WALL | __WNOTHREAD);
if (pid < 0)
if (pid < 0) {
if (errno == ECHILD) {
/* This mean we have nothing to wait, sleep
* and wait till signal interruption */
LOGD("proc_monitor: nothing to monitor, wait for signal\n");
struct timespec timespec = {
.tv_sec = INT_MAX,
.tv_nsec = 0
};
nanosleep(&timespec, nullptr);
}
continue;
}
bool detach = false;
RunFinally detach_task([&]() -> void {
if (detach) {