[PATCH 18/22] Implement shm_open(2)

[Karim Taha]

From: Stacey Son <s...@freebsd.org>

Co-authored-by: Kyle Evans <kev...@freebsd.org>

Signed-off-by: Stacey Son <s...@freebsd.org>
Signed-off-by: Kyle Evans <kev...@freebsd.org>
Signed-off-by: Karim Taha <kariem.taha...@gmail.com>
---
 bsd-user/bsd-mem.h            | 27 +++++++++++++++++++++++++++
 bsd-user/freebsd/os-syscall.c |  4 ++++
 2 files changed, 31 insertions(+)

diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h
index 6f33148eb7..013b82f49a 100644
--- a/bsd-user/bsd-mem.h
+++ b/bsd-user/bsd-mem.h
@@ -252,4 +252,31 @@ static inline abi_long do_obreak(abi_ulong new_brk)
     return bsd_target_brk;
 }
 
+/* shm_open(2) */
+static inline abi_long do_bsd_shm_open(abi_ulong arg1, abi_long arg2,
+        abi_long arg3)
+{
+    int ret;
+    void *p;
+
+#define SHM_PATH(p) ((p) == SHM_ANON ? (p) : path(p))
+    if (arg1 == (uintptr_t)SHM_ANON) {
+        p = SHM_ANON;
+    } else {
+        p = lock_user_string(arg1);
+        if (p == NULL) {
+            return -TARGET_EFAULT;
+        }
+    }
+    ret = get_errno(shm_open(SHM_PATH(p),
+                target_to_host_bitmask(arg2, fcntl_flags_tbl), arg3));
+
+    if (p != SHM_ANON) {
+        unlock_user(p, arg1, 0);
+    }
+
+    return ret;
+}
+#undef SHM_PATH
+
 #endif /* BSD_USER_BSD_MEM_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index 1b9dca9164..2d15255c20 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -531,6 +531,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num, 
abi_long arg1,
         ret = do_bsd_mincore(arg1, arg2, arg3);
         break;
 
+    case TARGET_FREEBSD_NR_freebsd12_shm_open: /* shm_open(2) */
+        ret = do_bsd_shm_open(arg1, arg2, arg3);
+        break;
+
 #if defined(__FreeBSD_version) && __FreeBSD_version >= 1300048
     case TARGET_FREEBSD_NR_shm_open2: /* shm_open2(2) */
         ret = do_freebsd_shm_open2(arg1, arg2, arg3, arg4, arg5);
-- 
2.40.0