From: Jacob Lifshay <programmerjake@gmail.com>
Date: Mon, 4 Dec 2023 10:15:47 +0000 (-0800)
Subject: caller.py: implement writev syscall
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7a91bc2921e3b5fff1d647d6dba0573d259fb95e;p=openpower-isa.git

caller.py: implement writev syscall
---

diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py
index e2f997cb..556c9b10 100644
--- a/src/openpower/decoder/isa/caller.py
+++ b/src/openpower/decoder/isa/caller.py
@@ -1177,6 +1177,29 @@ 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: