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| author | Ken Brown <kbrown@cornell.edu> | 2021-04-15 11:21:14 -0400 |
|---|---|---|
| committer | Ken Brown <kbrown@cornell.edu> | 2021-04-15 11:21:14 -0400 |
| commit | c5c7cec44917283d983b8b35bbf11c43fbca7710 (patch) | |
| tree | 2aacdca8eb6497edc2c69c0e9730376f824b6487 | |
| parent | 82c65349c2592207ba9fec15d869962858713a5c (diff) | |
| download | newlib-github/topic/af_unix.zip newlib-github/topic/af_unix.tar.gz newlib-github/topic/af_unix.tar.bz2 | |
Cygwin: AF_UNIX: select: DGRAM sockets are always ready for writinggithub/topic/af_unixtopic/af_unix
Our DGRAM sockets have no send buffer to check for available space, so
we always report that they are ready for writing. An attempt to send
might still block waiting for a pipe connection, but that's allowable
in view of the non-atomicity of select/send.
| -rw-r--r-- | winsup/cygwin/select.cc | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc index 9d3d86d..3594abd 100644 --- a/winsup/cygwin/select.cc +++ b/winsup/cygwin/select.cc @@ -2077,12 +2077,17 @@ check_write: gotone += me->write_ready = true; goto out; } - /* FIXME: With our current implementation of datagram sockets, - we have no send buffer, so we can't adequately test whether a - write would block. We might block waiting for a pipe - connection. */ - if (fh->get_socket_type () == SOCK_STREAM - && fh->connect_state () == connected) + if (fh->get_socket_type () == SOCK_DGRAM) + /* We have no send buffer to check for available space, so + just report ready for write. An attempt to send might + still block waiting for a pipe connection, but that's + allowable in view of the non-atomicity of select/send. */ + { + select_printf ("DGRAM, so ready for write"); + gotone += me->write_ready = true; + goto out; + } + else if (fh->connect_state () == connected) { /* FIXME: I'm not calling pipe_data_available because its test for space available in the buffer doesn't make sense |