[PATCH v2 10/11] bsd-user: Implement trunctate and ftruncate

[Warner Losh <imp@bsdimp.com>]

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/bsd-file.h           | 29 +++++++++++++++++++++++++++++
 bsd-user/freebsd/os-syscall.c |  8 ++++++++
 2 files changed, 37 insertions(+)

diff --git a/bsd-user/bsd-file.h b/bsd-user/bsd-file.h
index 021541ad2e0..fda36894605 100644
--- a/bsd-user/bsd-file.h
+++ b/bsd-user/bsd-file.h
@@ -497,4 +497,33 @@ static abi_long do_bsd_dup2(abi_long arg1, abi_long arg2)
     return get_errno(dup2(arg1, arg2));
 }
 
+/* truncate(2) */
+static abi_long do_bsd_truncate(void *cpu_env, abi_long arg1,
+        abi_long arg2, abi_long arg3, abi_long arg4)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg1);
+    if (regpairs_aligned(cpu_env) != 0) {
+        arg2 = arg3;
+        arg3 = arg4;
+    }
+    ret = get_errno(truncate(p, target_arg64(arg2, arg3)));
+    UNLOCK_PATH(p, arg1);
+
+    return ret;
+}
+
+/* ftruncate(2) */
+static abi_long do_bsd_ftruncate(void *cpu_env, abi_long arg1,
+        abi_long arg2, abi_long arg3, abi_long arg4)
+{
+    if (regpairs_aligned(cpu_env) != 0) {
+        arg2 = arg3;
+        arg3 = arg4;
+    }
+    return get_errno(ftruncate(arg1, target_arg64(arg2, arg3)));
+}
+
 #endif /* BSD_FILE_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index d9ebb9d50d6..3c8f6cad0e8 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -357,6 +357,14 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         ret = do_bsd_dup2(arg1, arg2);
         break;
 
+    case TARGET_FREEBSD_NR_truncate: /* truncate(2) */
+        ret = do_bsd_truncate(cpu_env, arg1, arg2, arg3, arg4);
+        break;
+
+    case TARGET_FREEBSD_NR_ftruncate: /* ftruncate(2) */
+        ret = do_bsd_ftruncate(cpu_env, arg1, arg2, arg3, arg4);
+        break;
+
     default:
         qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
         ret = -TARGET_ENOSYS;
-- 
2.33.1