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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* V4L2 compatibility layer
*/
#include "v4l2_compat_manager.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <libcamera/base/utils.h>
#define LIBCAMERA_PUBLIC __attribute__((visibility("default")))
using namespace libcamera;
#define extract_va_arg(type, arg, last) \
{ \
va_list ap; \
va_start(ap, last); \
arg = va_arg(ap, type); \
va_end(ap); \
}
namespace {
/*
* Determine if the flags require a further mode arguments that needs to be
* parsed from va_args.
*/
bool needs_mode(int flags)
{
return (flags & O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
}
} /* namespace */
extern "C" {
LIBCAMERA_PUBLIC int open(const char *path, int oflag, ...)
{
mode_t mode = 0;
if (needs_mode(oflag))
extract_va_arg(mode_t, mode, oflag);
return V4L2CompatManager::instance()->openat(AT_FDCWD, path,
oflag, mode);
}
#ifndef open64
LIBCAMERA_PUBLIC int open64(const char *path, int oflag, ...)
{
mode_t mode = 0;
if (needs_mode(oflag))
extract_va_arg(mode_t, mode, oflag);
return V4L2CompatManager::instance()->openat(AT_FDCWD, path,
oflag | O_LARGEFILE, mode);
}
#endif
LIBCAMERA_PUBLIC int openat(int dirfd, const char *path, int oflag, ...)
{
mode_t mode = 0;
if (needs_mode(oflag))
extract_va_arg(mode_t, mode, oflag);
return V4L2CompatManager::instance()->openat(dirfd, path, oflag, mode);
}
#ifndef openat64
LIBCAMERA_PUBLIC int openat64(int dirfd, const char *path, int oflag, ...)
{
mode_t mode = 0;
if (needs_mode(oflag))
extract_va_arg(mode_t, mode, oflag);
return V4L2CompatManager::instance()->openat(dirfd, path,
oflag | O_LARGEFILE, mode);
}
#endif
/*
* _FORTIFY_SOURCE redirects open* to __open*_2. Disable the
* -Wmissing-declarations warnings, as the functions won't be declared if
* _FORTIFY_SOURCE is not in use.
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmissing-declarations"
LIBCAMERA_PUBLIC int __open_2(const char *path, int oflag)
{
assert(!needs_mode(oflag));
return open(path, oflag);
}
LIBCAMERA_PUBLIC int __open64_2(const char *path, int oflag)
{
assert(!needs_mode(oflag));
return open64(path, oflag);
}
LIBCAMERA_PUBLIC int __openat_2(int dirfd, const char *path, int oflag)
{
assert(!needs_mode(oflag));
return openat(dirfd, path, oflag);
}
LIBCAMERA_PUBLIC int __openat64_2(int dirfd, const char *path, int oflag)
{
assert(!needs_mode(oflag));
return openat64(dirfd, path, oflag);
}
#pragma GCC diagnostic pop
LIBCAMERA_PUBLIC int dup(int oldfd)
{
return V4L2CompatManager::instance()->dup(oldfd);
}
LIBCAMERA_PUBLIC int close(int fd)
{
return V4L2CompatManager::instance()->close(fd);
}
LIBCAMERA_PUBLIC void *mmap(void *addr, size_t length, int prot, int flags,
int fd, off_t offset)
{
return V4L2CompatManager::instance()->mmap(addr, length, prot, flags,
fd, offset);
}
#ifndef mmap64
LIBCAMERA_PUBLIC void *mmap64(void *addr, size_t length, int prot, int flags,
int fd, off64_t offset)
{
return V4L2CompatManager::instance()->mmap(addr, length, prot, flags,
fd, offset);
}
#endif
LIBCAMERA_PUBLIC int munmap(void *addr, size_t length)
{
return V4L2CompatManager::instance()->munmap(addr, length);
}
#if HAVE_POSIX_IOCTL
LIBCAMERA_PUBLIC int ioctl(int fd, int request, ...)
#else
LIBCAMERA_PUBLIC int ioctl(int fd, unsigned long request, ...)
#endif
{
void *arg;
extract_va_arg(void *, arg, request);
return V4L2CompatManager::instance()->ioctl(fd, request, arg);
}
}
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