1 files changed, 150 insertions, 0 deletions
diff --git a/pipewire-v4l2/src/v4l2-func.c b/pipewire-v4l2/src/v4l2-func.c
new file mode 100644
index 0000000..c28e834
--- /dev/null
+++ b/pipewire-v4l2/src/v4l2-func.c
@@ -0,0 +1,150 @@
+/* PipeWire
+ *
+ * Copyright © 2021 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * We need to export open* etc., but _FORTIFY_SOURCE defines conflicting
+ * always_inline versions. Disable _FORTIFY_SOURCE for this file, so we
+ * can define our overrides.
+ */
+#ifdef _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "pipewire-v4l2.h"
+
+#define SPA_EXPORT __attribute__((visibility("default")))
+
+#define extract_va_arg(type, arg, last)	\
+{					\
+	va_list ap;			\
+	va_start(ap, last);		\
+	arg = va_arg(ap, type);		\
+	va_end(ap);			\
+}
+
+SPA_EXPORT int open(const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+	if (oflag & O_CREAT || oflag & O_TMPFILE)
+		extract_va_arg(mode_t, mode, oflag);
+
+	return get_fops()->openat(AT_FDCWD, path, oflag, mode);
+}
+
+/* _FORTIFY_SOURCE redirects open to __open_2 */
+SPA_EXPORT int __open_2(const char *path, int oflag)
+{
+	return open(path, oflag);
+}
+
+#ifndef open64
+SPA_EXPORT int open64(const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+	if (oflag & O_CREAT || oflag & O_TMPFILE)
+		extract_va_arg(mode_t, mode, oflag);
+
+	return get_fops()->openat(AT_FDCWD, path, oflag | O_LARGEFILE, mode);
+}
+
+SPA_EXPORT int __open64_2(const char *path, int oflag)
+{
+        return open(path, oflag);
+}
+#endif
+
+SPA_EXPORT int openat(int dirfd, const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+	if (oflag & O_CREAT || oflag & O_TMPFILE)
+		extract_va_arg(mode_t, mode, oflag);
+
+	return get_fops()->openat(dirfd, path, oflag, mode);
+}
+
+SPA_EXPORT int __openat_2(int dirfd, const char *path, int oflag)
+{
+	return openat(dirfd, path, oflag);
+}
+
+#ifndef openat64
+SPA_EXPORT int openat64(int dirfd, const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+	if (oflag & O_CREAT || oflag & O_TMPFILE)
+		extract_va_arg(mode_t, mode, oflag);
+
+	return get_fops()->openat(dirfd, path, oflag | O_LARGEFILE, mode);
+}
+
+SPA_EXPORT int __openat64_2(int dirfd, const char *path, int oflag)
+{
+	return openat(dirfd, path, oflag);
+}
+#endif
+
+SPA_EXPORT int dup(int oldfd)
+{
+	return get_fops()->dup(oldfd);
+}
+
+SPA_EXPORT int close(int fd)
+{
+	return get_fops()->close(fd);
+}
+
+SPA_EXPORT void *mmap(void *addr, size_t length, int prot, int flags,
+                            int fd, off_t offset)
+{
+	return get_fops()->mmap(addr, length, prot, flags, fd, offset);
+}
+
+#ifndef mmap64
+SPA_EXPORT void *mmap64(void *addr, size_t length, int prot, int flags,
+                              int fd, off64_t offset)
+{
+	return get_fops()->mmap(addr, length, prot, flags, fd, offset);
+}
+#endif
+
+SPA_EXPORT int munmap(void *addr, size_t length)
+{
+	return get_fops()->munmap(addr, length);
+}
+
+SPA_EXPORT int ioctl(int fd, unsigned long int request, ...)
+{
+	void *arg;
+	extract_va_arg(void *, arg, request);
+	return get_fops()->ioctl(fd, request, arg);
+}