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osmo_io: Support writing to files with mode OSMO_IO_FD_MODE_READ_WRITE

Trying to use IORING_OP_SENDMSG on local files fails with "Socket
operation on non-socket" errors.

Change-Id: Iefcbc7d09f429f4ecc611227cb5ef796f50c0539
---
M src/core/osmo_io_uring.c
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/63/39363/1

diff --git a/src/core/osmo_io_uring.c b/src/core/osmo_io_uring.c
index 72a465e..5fd7ddc 100644
--- a/src/core/osmo_io_uring.c
+++ b/src/core/osmo_io_uring.c
@@ -307,6 +307,8 @@
 
 	switch (msghdr->action) {
 	case IOFD_ACT_WRITE:
+		io_uring_prep_write(sqe, msghdr->iofd->fd, msghdr->iov[0].iov_base, msghdr->iov[0].iov_len, 0);
+		break;
 	case IOFD_ACT_SENDTO:
 	case IOFD_ACT_SENDMSG:
 		io_uring_prep_sendmsg(sqe, msghdr->iofd->fd, &msghdr->hdr, msghdr->flags);

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