caller.py: implement writev syscall
authorJacob Lifshay <programmerjake@gmail.com>
Mon, 4 Dec 2023 10:15:47 +0000 (02:15 -0800)
committerLuke Kenneth Casson Leighton <lkcl@lkcl.net>
Wed, 13 Dec 2023 09:34:40 +0000 (09:34 +0000)
src/openpower/decoder/isa/caller.py

index fd0a60fee6b3246ce595a723a89782c6edfb45ab..e14fa8438f005ffe6a6842e3bb96a3de48a40c7c 100644 (file)
@@ -1186,6 +1186,29 @@ class SyscallEmulator(openpower.syscalls.Dispatcher):
         except OSError as e:
             return -e.errno
 
+    def sys_writev(self, fd, iov, iovcnt, *rest):
+        IOV_MAX = 1024
+        if iovcnt < 0 or iovcnt > IOV_MAX:
+            return -errno.EINVAL
+        struct_iovec = struct.Struct("<QQ")
+        try:
+            if iovcnt > 0:
+                iov = self.__isacaller.mem.get_ctypes(
+                    iov, struct_iovec.size * iovcnt, is_write=False)
+                iov = list(struct_iovec.iter_unpack(iov))
+            else:
+                iov = []
+            for i, iovec in enumerate(iov):
+                iov_base, iov_len = iovec
+                iov[i] = self.__isacaller.mem.get_ctypes(
+                    iov_base, iov_len, is_write=False)
+        except (ValueError, MemException):
+            return -errno.EFAULT
+        try:
+            return os.writev(fd, iov)
+        except OSError as e:
+            return -e.errno
+
     def sys_read(self, fd, buf, count, *rest):
         buf = self.__isacaller.mem.get_ctypes(buf, count, is_write=True)
         try: