linux-user: Implement starttime field in self stat emulation

Instead of always returning 0, return actual starttime.

Signed-off-by: Cameron Esfahani <dirty@apple.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220128001251.45165-1-dirty@apple.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 14 insertions, 0 deletions

diff --git a/linux-user/main.c b/linux-user/main.c
index 16def5215d..fbc9bcfd5f 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -190,12 +190,26 @@ void stop_all_tasks(void)
 /* Assumes contents are already zeroed.  */
 void init_task_state(TaskState *ts)
 {
+    long ticks_per_sec;
+    struct timespec bt;
+
     ts->used = 1;
     ts->sigaltstack_used = (struct target_sigaltstack) {
         .ss_sp = 0,
         .ss_size = 0,
         .ss_flags = TARGET_SS_DISABLE,
     };
+
+    /* Capture task start time relative to system boot */
+
+    ticks_per_sec = sysconf(_SC_CLK_TCK);
+
+    if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) {
+        /* start_boottime is expressed in clock ticks */
+        ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec;
+        ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec /
+                              NANOSECONDS_PER_SECOND;
+    }
 }
 
 CPUArchState *cpu_copy(CPUArchState *env)