[PATCH] linux-user: remove host stime() syscall

[Laurent Vivier]

stime() has been withdrawn from glibc
(12cbde1dae6f "Use clock_settime to implement stime; withdraw stime.")

Implement the target stime() syscall using host
clock_settime(CLOCK_REALTIME, ...) as it is done internally in glibc.

Tested qemu-ppc/x86_64 with:

        #include <time.h>
        #include <stdio.h>

        int main(void)
        {
                time_t t;
                int ret;

                /* date -u -d"2019-11-12T15:11:00" "+%s" */
                t = 1573571460;
                ret = stime(&t);
                printf("ret %d\n", ret);
                return 0;
        }

        # date; ./stime; date
        Tue Nov 12 14:18:32 UTC 2019
        ret 0
        Tue Nov 12 15:11:00 UTC 2019

Buglink: https://bugs.launchpad.net/qemu/+bug/1852115
Reported-by: Cole Robinson <address@hidden>
Signed-off-by: Laurent Vivier <address@hidden>
---
 linux-user/syscall.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index ab9d933e53af..c4dcdc94b10c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7763,10 +7763,12 @@ static abi_long do_syscall1(void *cpu_env, int num, 
abi_long arg1,
 #ifdef TARGET_NR_stime /* not on alpha */
     case TARGET_NR_stime:
         {
-            time_t host_time;
-            if (get_user_sal(host_time, arg1))
+            struct timespec ts;
+            ts.tv_nsec = 0;
+            if (get_user_sal(ts.tv_sec, arg1)) {
                 return -TARGET_EFAULT;
-            return get_errno(stime(&host_time));
+            }
+            return get_errno(clock_settime(CLOCK_REALTIME, &ts));
         }
 #endif
 #ifdef TARGET_NR_alarm /* not on alpha */
-- 
2.21.0