bpo-41687: Fix sendfile implementation to work with Solaris (#22040)
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index a6a4b9f..00ba758 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -9518,6 +9518,25 @@
if (!Py_off_t_converter(offobj, &offset))
return NULL;
+#if defined(__sun) && defined(__SVR4)
+ // On Solaris, sendfile raises EINVAL rather than returning 0
+ // when the offset is equal or bigger than the in_fd size.
+ int res;
+ struct stat st;
+
+ do {
+ Py_BEGIN_ALLOW_THREADS
+ res = fstat(in_fd, &st);
+ Py_END_ALLOW_THREADS
+ } while (res != 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
+ if (ret < 0)
+ return (!async_err) ? posix_error() : NULL;
+
+ if (offset >= st.st_size) {
+ return Py_BuildValue("i", 0);
+ }
+#endif
+
do {
Py_BEGIN_ALLOW_THREADS
ret = sendfile(out_fd, in_fd, &offset, count);