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[3.8] bpo-42237: Fix os.sendfile() on illumos (GH-23154). (GH-23246) 

(cherry picked from commit fd4ed57674)

Co-authored-by: Jakub Stasiak <jakub@stasiak.at>
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Jakub Stasiak 2020-11-12 13:23:48 +01:00 committed by GitHub
parent c745b36ee3
commit f37628eb71
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1
Misc/NEWS.d/next/Library/2020-11-10-14-27-49.bpo-42237.F363jO.rst Normal file
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@ -0,0 +1 @@
Fix `os.sendfile()` on illumos.

18
Modules/posixmodule.c
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@ -9281,9 +9281,27 @@ done:
if (!Py_off_t_converter(offobj, &offset))
return NULL;
#if defined(__sun) && defined(__SVR4)
// On illumos specifically sendfile() may perform a partial write but
// return -1/an error (in one confirmed case the destination socket
// had a 5 second timeout set and errno was EAGAIN) and it's on the client
// code to check if the offset parameter was modified by sendfile().
//
// We need this variable to track said change.
off_t original_offset = offset;
#endif
do {
Py_BEGIN_ALLOW_THREADS
ret = sendfile(out, in, &offset, count);
#if defined(__sun) && defined(__SVR4)
// This handles illumos-specific sendfile() partial write behavior,
// see a comment above for more details.
if (ret < 0 && offset != original_offset) {
ret = offset - original_offset;
}
#endif
Py_END_ALLOW_THREADS
} while (ret < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
if (ret < 0)