[Qemu-devel] [PATCH for 4.2 v4 12/12] linux-user: Add support for semtimedop() syscall

[Aleksandar Markovic <aleksandar.markovic@rt-rk.com>]

From: Aleksandar Rikalo <arikalo@wavecomp.com>

Add support for semtimedop() emulation. It is based on invocation
of safe_semtimedop().

Conversion is left out of safe_semtimedop(), since other safe_xxx()
usually don't contain similar conversions.

Signed-off-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
---
 linux-user/syscall.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index ee80175..6825458 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6650,7 +6650,43 @@ static inline abi_long host_to_target_statx(struct target_statx *host_stx,
     return 0;
 }
 #endif
+#ifdef TARGET_NR_semtimedop
+static inline abi_long do_semtimedop(int semid, abi_long ptr, unsigned nsops,
+                                     abi_long timeout)
+{
+    struct sembuf *sops;
+    struct timespec ts, *pts;
+    abi_long ret;
+
+    if (timeout) {
+        pts = &ts;
+        if (target_to_host_timespec(pts, timeout)) {
+            return -TARGET_EFAULT;
+        }
+    } else {
+        pts = NULL;
+    }
 
+    sops = g_malloc(sizeof(struct sembuf) * nsops);
+    if (sops == NULL) {
+        return -TARGET_EFAULT;
+    }
+
+    if (target_to_host_sembuf(sops, ptr, nsops)) {
+        g_free(sops);
+        return -TARGET_EFAULT;
+    }
+
+#ifdef __NR_semtimedop
+    ret = get_errno(safe_semtimedop(semid, sops, nsops, pts));
+#else
+    ret = -TARGET_ENOSYS;
+#endif
+    g_free(sops);
+
+    return ret;
+}
+#endif
 
 /* ??? Using host futex calls even when target atomic operations
    are not really atomic probably breaks things.  However implementing
@@ -9194,6 +9230,10 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
     case TARGET_NR_semop:
         return do_semop(arg1, arg2, arg3);
 #endif
+#ifdef TARGET_NR_semtimedop
+    case TARGET_NR_semtimedop:
+        return do_semtimedop(arg1, arg2, arg3, arg4);
+#endif
 #ifdef TARGET_NR_semctl
     case TARGET_NR_semctl:
         return do_semctl(arg1, arg2, arg3, arg4);
-- 
2.7.4