Squashed 'external/sdl/SDL/' content from commit b8d91252c

git-subtree-dir: external/sdl/SDL
git-subtree-split: b8d91252c6488cf9c645aba447b56bb9dbd9609a

src/audio/sndio/SDL_sndioaudio.h

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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_sndioaudio_h_
+#define SDL_sndioaudio_h_
+
+#include <poll.h>
+#include <sndio.h>
+
+#include "../SDL_sysaudio.h"
+
+struct SDL_PrivateAudioData
+{
+    /* The audio device handle */
+    struct sio_hdl *dev;
+
+    /* Raw mixing buffer */
+    Uint8 *mixbuf;
+    int mixlen;
+
+    /* Polling structures for non-blocking sndio devices */
+    struct pollfd *pfd;
+};
+
+#endif /* SDL_sndioaudio_h_ */