components/python/python37/patches/33-os-sendfile.patch

   1 https://github.com/python/cpython/pull/23246
   2
   3 --- Python-3.7.7/Modules/posixmodule.c.orig     2021-01-08 21:00:38.844294220 +0000
   4 +++ Python-3.7.7/Modules/posixmodule.c  2021-01-08 21:14:50.305772937 +0000
   5 @@ -8517,9 +8517,26 @@
   6      if (!Py_off_t_converter(offobj, &offset))
   7          return NULL;
   8
   9 +#if defined(__sun) && defined(__SVR4)
  10 +    // On illumos specifically sendfile() may perform a partial write but
  11 +    // return -1/an error (in one confirmed case the destination socket
  12 +    // had a 5 second timeout set and errno was EAGAIN) and it's on the client
  13 +    // code to check if the offset parameter was modified by sendfile().
  14 +    //
  15 +    // We need this variable to track said change.
  16 +    off_t original_offset = offset;
  17 +#endif
  18 +
  19      do {
  20          Py_BEGIN_ALLOW_THREADS
  21          ret = sendfile(out, in, &offset, count);
  22 +#if defined(__sun) && defined(__SVR4)
  23 +        // This handles illumos-specific sendfile() partial write behavior,
  24 +        // see a comment above for more details.
  25 +        if (ret < 0 && offset != original_offset) {
  26 +            ret = offset - original_offset;
  27 +        }
  28 +#endif
  29          Py_END_ALLOW_THREADS
  30      } while (ret < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
  31      if (ret < 0)