[PATCH v3 21/23] bsd-user: Implement shmctl(2)

[Karim Taha <kariem.taha2.7@gmail.com>]

From: Stacey Son <sson@FreeBSD.org>

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>

Reviewed-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/bsd-mem.h            | 39 +++++++++++++++++++++++++++++++++++
 bsd-user/freebsd/os-syscall.c |  4 ++++
 2 files changed, 43 insertions(+)

diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h
index 27d4e7f079..68f34b5d36 100644
--- a/bsd-user/bsd-mem.h
+++ b/bsd-user/bsd-mem.h
@@ -304,4 +304,43 @@ static inline abi_long do_bsd_shmget(abi_long arg1, abi_ulong arg2,
     return get_errno(shmget(arg1, arg2, arg3));
 }
 
+/* shmctl(2) */
+static inline abi_long do_bsd_shmctl(abi_long shmid, abi_long cmd,
+        abi_ulong buff)
+{
+    struct shmid_ds dsarg;
+    abi_long ret = -TARGET_EINVAL;
+
+    cmd &= 0xff;
+
+    switch (cmd) {
+    case IPC_STAT:
+        if (target_to_host_shmid_ds(&dsarg, buff)) {
+            return -TARGET_EFAULT;
+        }
+        ret = get_errno(shmctl(shmid, cmd, &dsarg));
+        if (host_to_target_shmid_ds(buff, &dsarg)) {
+            return -TARGET_EFAULT;
+        }
+        break;
+
+    case IPC_SET:
+        if (target_to_host_shmid_ds(&dsarg, buff)) {
+            return -TARGET_EFAULT;
+        }
+        ret = get_errno(shmctl(shmid, cmd, &dsarg));
+        break;
+
+    case IPC_RMID:
+        ret = get_errno(shmctl(shmid, cmd, NULL));
+        break;
+
+    default:
+        ret = -TARGET_EINVAL;
+        break;
+    }
+
+    return ret;
+}
+
 #endif /* BSD_USER_BSD_MEM_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index 52cca2300f..35f94f51fc 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -555,6 +555,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         ret = do_bsd_shmget(arg1, arg2, arg3);
         break;
 
+    case TARGET_FREEBSD_NR_shmctl: /* shmctl(2) */
+        ret = do_bsd_shmctl(arg1, arg2, arg3);
+        break;
+
         /*
          * Misc
          */
-- 
2.42.0