Parse process starttime.
Application developers would like to know how long their process has
been alive for to distinguish between crashes that happen immediately
upon startup and crashes in regular operation.
Test: treehugger
Change-Id: I71d6fea95666b53770cebf919f4c881b142beddf
diff --git a/process_test.cpp b/process_test.cpp
index 9da9278..be00a17 100644
--- a/process_test.cpp
+++ b/process_test.cpp
@@ -28,6 +28,7 @@
#include <gtest/gtest.h>
+#include <android-base/logging.h>
#include <android-base/stringprintf.h>
using namespace std::chrono_literals;
@@ -116,3 +117,44 @@
ASSERT_EQ(forkpid, waitpid(forkpid, nullptr, 0));
}
+
+static uint64_t read_uptime_secs() {
+ std::string uptime;
+ if (!android::base::ReadFileToString("/proc/uptime", &uptime)) {
+ PLOG(FATAL) << "failed to read /proc/uptime";
+ }
+ return strtoll(uptime.c_str(), nullptr, 10);
+}
+
+TEST(process_info, process_start_time) {
+ uint64_t start = read_uptime_secs();
+ int pipefd[2];
+ ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
+
+ std::this_thread::sleep_for(1000ms);
+
+ pid_t forkpid = fork();
+
+ ASSERT_NE(-1, forkpid);
+ if (forkpid == 0) {
+ close(pipefd[1]);
+ char buf;
+ TEMP_FAILURE_RETRY(read(pipefd[0], &buf, 1));
+ _exit(0);
+ }
+
+ std::this_thread::sleep_for(1000ms);
+
+ uint64_t end = read_uptime_secs();
+
+ android::procinfo::ProcessInfo procinfo;
+ ASSERT_TRUE(android::procinfo::GetProcessInfo(forkpid, &procinfo));
+
+ // starttime is measured in clock ticks: uptime is in seconds:
+ uint64_t process_start = procinfo.starttime / sysconf(_SC_CLK_TCK);
+ ASSERT_LE(start, process_start);
+ ASSERT_LE(process_start, end);
+
+ ASSERT_EQ(0, kill(forkpid, SIGKILL));
+ ASSERT_EQ(forkpid, waitpid(forkpid, nullptr, 0));
+}