[PULL 15/18] linux-user: Add support for 'mq_timedsend_time64()' and 'mq_timedreceive_time64()'

[Laurent Vivier <laurent@vivier.eu>]

From: Filip Bozuta <Filip.Bozuta@syrmia.com>

This patch implements functionality for following time64 syscalls:

*mq_timedsend_time64()

    This is a year 2038 safe vairant of syscall:

    int mq_timedsend(mqd_t mqdes, const char *msg_ptr,
                     size_t msg_len, unsigned int msg_prio,
                     const struct timespec *abs_timeout)
    --send a message to a message queue--
    man page: https://www.man7.org/linux/man-pages/man2/mq_timedsend.2.html

*mq_timedreceive_time64()

    This is a year 2038 safe variant of syscall:

    ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr,
                            size_t msg_len, unsigned int *msg_prio,
                            const struct timespec *abs_timeout)
    --receive a message from a message queue--
    man page: https://man7.org/linux/man-pages/man3/mq_receive.3.html

Implementation notes:

    These syscalls were implemented in similar ways like
    'mq_timedsend()' and 'mq_timedreceive' except that
    functions 'target_to_host_timespec64()' and
    'host_to_target_timespec64()' were used to convert
    values of 'struct timespec' between host and target.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200824193752.67950-3-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/syscall.c | 56 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 54 insertions(+), 2 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 3b725bbe2513..b28c8edb421e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -799,11 +799,13 @@ safe_syscall5(int, msgrcv, int, msgid, void *, msgp, size_t, sz,
 safe_syscall4(int, semtimedop, int, semid, struct sembuf *, tsops,
               unsigned, nsops, const struct timespec *, timeout)
 #endif
-#ifdef TARGET_NR_mq_timedsend
+#if defined(TARGET_NR_mq_timedsend) || \
+    defined(TARGET_NR_mq_timedsend_time64)
 safe_syscall5(int, mq_timedsend, int, mqdes, const char *, msg_ptr,
               size_t, len, unsigned, prio, const struct timespec *, timeout)
 #endif
-#ifdef TARGET_NR_mq_timedreceive
+#if defined(TARGET_NR_mq_timedreceive) || \
+    defined(TARGET_NR_mq_timedreceive_time64)
 safe_syscall5(int, mq_timedreceive, int, mqdes, char *, msg_ptr,
               size_t, len, unsigned *, prio, const struct timespec *, timeout)
 #endif
@@ -1218,6 +1220,8 @@ static inline abi_long target_to_host_timespec(struct timespec *host_ts,
 
 #if defined(TARGET_NR_clock_settime64) || defined(TARGET_NR_futex_time64) || \
     defined(TARGET_NR_timer_settime64) || \
+    defined(TARGET_NR_mq_timedsend_time64) || \
+    defined(TARGET_NR_mq_timedreceive_time64) || \
     (defined(TARGET_NR_timerfd_settime64) && defined(CONFIG_TIMERFD))
 static inline abi_long target_to_host_timespec64(struct timespec *host_ts,
                                                  abi_ulong target_addr)
@@ -12059,6 +12063,27 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
         }
         return ret;
 #endif
+#ifdef TARGET_NR_mq_timedsend_time64
+    case TARGET_NR_mq_timedsend_time64:
+        {
+            struct timespec ts;
+
+            p = lock_user(VERIFY_READ, arg2, arg3, 1);
+            if (arg5 != 0) {
+                if (target_to_host_timespec64(&ts, arg5)) {
+                    return -TARGET_EFAULT;
+                }
+                ret = get_errno(safe_mq_timedsend(arg1, p, arg3, arg4, &ts));
+                if (!is_error(ret) && host_to_target_timespec64(arg5, &ts)) {
+                    return -TARGET_EFAULT;
+                }
+            } else {
+                ret = get_errno(safe_mq_timedsend(arg1, p, arg3, arg4, NULL));
+            }
+            unlock_user(p, arg2, arg3);
+        }
+        return ret;
+#endif
 
 #ifdef TARGET_NR_mq_timedreceive
     case TARGET_NR_mq_timedreceive:
@@ -12086,6 +12111,33 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
         }
         return ret;
 #endif
+#ifdef TARGET_NR_mq_timedreceive_time64
+    case TARGET_NR_mq_timedreceive_time64:
+        {
+            struct timespec ts;
+            unsigned int prio;
+
+            p = lock_user(VERIFY_READ, arg2, arg3, 1);
+            if (arg5 != 0) {
+                if (target_to_host_timespec64(&ts, arg5)) {
+                    return -TARGET_EFAULT;
+                }
+                ret = get_errno(safe_mq_timedreceive(arg1, p, arg3,
+                                                     &prio, &ts));
+                if (!is_error(ret) && host_to_target_timespec64(arg5, &ts)) {
+                    return -TARGET_EFAULT;
+                }
+            } else {
+                ret = get_errno(safe_mq_timedreceive(arg1, p, arg3,
+                                                     &prio, NULL));
+            }
+            unlock_user(p, arg2, arg3);
+            if (arg4 != 0) {
+                put_user_u32(prio, arg4);
+            }
+        }
+        return ret;
+#endif
 
     /* Not implemented for now... */
 /*     case TARGET_NR_mq_notify: */
-- 
2.26.2