Merge "Fix access check" (87ef739d) · Commits · e / os / android_system_core

libcutils/sched_policy.c

+10 −3

Original line number	Diff line number	Diff line
		@@ -52,6 +52,7 @@ static inline SchedPolicy _policy(SchedPolicy p)
		static pthread_once_t the_once = PTHREAD_ONCE_INIT;

		static int __sys_supports_schedgroups = -1;
		static int __sys_supports_timerslack = -1;

		// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error.
		static int bg_cgroup_fd = -1;
		@@ -104,7 +105,7 @@ static int add_tid_to_cgroup(int tid, int fd)

		static void __initialize(void) {
		char* filename;
		if (!access("/dev/cpuctl/tasks", F_OK)) {
		if (!access("/dev/cpuctl/tasks", W_OK)) {
		__sys_supports_schedgroups = 1;

		filename = "/dev/cpuctl/tasks";
		@@ -123,7 +124,7 @@ static void __initialize(void) {
		}

		#ifdef USE_CPUSETS
		if (!access("/dev/cpuset/tasks", F_OK)) {
		if (!access("/dev/cpuset/tasks", W_OK)) {

		filename = "/dev/cpuset/foreground/tasks";
		fg_cpuset_fd = open(filename, O_WRONLY \| O_CLOEXEC);
		@@ -142,6 +143,10 @@ static void __initialize(void) {
		#endif
		}
		#endif

		char buf[64];
		snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", getpid());
		__sys_supports_timerslack = !access(buf, W_OK);
		}

		/*
		@@ -417,8 +422,10 @@ int set_sched_policy(int tid, SchedPolicy policy)
		&param);
		}

		if (__sys_supports_timerslack) {
		set_timerslack_ns(tid, policy == SP_BACKGROUND ?
		TIMER_SLACK_BG : TIMER_SLACK_FG);
		}

		return 0;
		}