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platform_system_core
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Merge "Fix access check"

This commit is contained in:
John Reck 2016-08-29 22:15:22 +00:00 committed by Gerrit Code Review
parent 10348cbeb9 2e336b1da1
commit 87ef739dba
1 changed files with 10 additions and 3 deletions
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13
libcutils/sched_policy.c
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@ -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);
}
set_timerslack_ns(tid, policy == SP_BACKGROUND ?
if (__sys_supports_timerslack) {
set_timerslack_ns(tid, policy == SP_BACKGROUND ?
TIMER_SLACK_BG : TIMER_SLACK_FG);
}
return 0;
}