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-rw-r--r--linux-user/main.c14
-rw-r--r--linux-user/qemu.h3
-rw-r--r--linux-user/syscall.c3
3 files changed, 20 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)
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 9d2b3119d1..98dfbf2096 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -154,6 +154,9 @@ typedef struct TaskState {
/* This thread's sigaltstack, if it has one */
struct target_sigaltstack sigaltstack_used;
+
+ /* Start time of task after system boot in clock ticks */
+ uint64_t start_boottime;
} TaskState;
abi_long do_brk(abi_ulong new_brk);
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 84cfa223df..b3948d13a9 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8077,6 +8077,9 @@ static int open_self_stat(void *cpu_env, int fd)
} else if (i == 3) {
/* ppid */
g_string_printf(buf, FMT_pid " ", getppid());
+ } else if (i == 21) {
+ /* starttime */
+ g_string_printf(buf, "%" PRIu64 " ", ts->start_boottime);
} else if (i == 27) {
/* stack bottom */
g_string_printf(buf, TARGET_ABI_FMT_ld " ", ts->info->start_stack);