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liblog: cache getuid() syscall 

BUG: 15315766
Change-Id: I8f889a1c6ede74f2621f1b8ea5fda666c4b9cba2
This commit is contained in:
Mark Salyzyn 2014-05-29 17:53:41 -07:00
parent 252b0e2b46
commit 076ba81ce9
1 changed files with 10 additions and 7 deletions
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17
liblog/logd_write.c
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@ -159,10 +159,14 @@ static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
struct timespec ts;
log_time realtime_ts;
size_t i, payload_size;
static uid_t last_uid = AID_ROOT; /* logd *always* starts up as AID_ROOT */
if (getuid() == AID_LOGD) {
if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
last_uid = getuid();
}
if (last_uid == AID_LOGD) { /* logd, after initialization and priv drop */
/*
* ignore log messages we send to ourself.
* ignore log messages we send to ourself (logd).
* Such log messages are often generated by libraries we depend on
* which use standard Android logging.
*/
@ -193,6 +197,10 @@ static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
* };
*/
clock_gettime(CLOCK_REALTIME, &ts);
realtime_ts.tv_sec = ts.tv_sec;
realtime_ts.tv_nsec = ts.tv_nsec;
log_id_buf = log_id;
tid = gettid();
@ -200,11 +208,6 @@ static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
newVec[0].iov_len = sizeof_log_id_t;
newVec[1].iov_base = (unsigned char *) &tid;
newVec[1].iov_len = sizeof(tid);
clock_gettime(CLOCK_REALTIME, &ts);
realtime_ts.tv_sec = ts.tv_sec;
realtime_ts.tv_nsec = ts.tv_nsec;
newVec[2].iov_base = (unsigned char *) &realtime_ts;
newVec[2].iov_len = sizeof(log_time);