1023107b64
Some applications (eg. Firefox, Google Chrome, Skype) use open64, openat64, and mmap64 instead of their non-64 versions that we currently intercept. Intercept these calls as well. _LARGEFILE64_SOURCE needs to be set so that the 64-bit symbols are available and not synonymous to the non-64-bit versions on 64-bit systems. Also, since we set _FILE_OFFSET_BITS to 32 to force the various open and mmap symbols that we export to not be the 64-bit versions, our dlsym to get the original open and mmap calls will not automatically be converted to their 64-bit versions. Since we intercept both 32-bit and 64-bit versions of open and mmap, we should be using the 64-bit version to service both. Fetch the 64-bit versions of openat and mmap directly. musl defines the 64-bit symbols as macros that are equivalent to the non-64-bit symbols, so we put compile guards that check if the 64-bit symbols are defined. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> # Compile with musl Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
134 lines
3 KiB
C++
134 lines
3 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* v4l2_compat.cpp - V4L2 compatibility layer
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*/
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#include "v4l2_compat_manager.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#define LIBCAMERA_PUBLIC __attribute__((visibility("default")))
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using namespace libcamera;
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#define extract_va_arg(type, arg, last) \
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{ \
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va_list ap; \
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va_start(ap, last); \
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arg = va_arg(ap, type); \
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va_end(ap); \
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}
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extern "C" {
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LIBCAMERA_PUBLIC int open(const char *path, int oflag, ...)
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{
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mode_t mode = 0;
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if (oflag & O_CREAT || oflag & O_TMPFILE)
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extract_va_arg(mode_t, mode, oflag);
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return V4L2CompatManager::instance()->openat(AT_FDCWD, path,
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oflag, mode);
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}
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/* _FORTIFY_SOURCE redirects open to __open_2 */
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LIBCAMERA_PUBLIC int __open_2(const char *path, int oflag)
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{
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return open(path, oflag);
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}
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#ifndef open64
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LIBCAMERA_PUBLIC int open64(const char *path, int oflag, ...)
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{
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mode_t mode = 0;
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if (oflag & O_CREAT || oflag & O_TMPFILE)
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extract_va_arg(mode_t, mode, oflag);
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return V4L2CompatManager::instance()->openat(AT_FDCWD, path,
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oflag | O_LARGEFILE, mode);
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}
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LIBCAMERA_PUBLIC int __open64_2(const char *path, int oflag)
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{
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return open(path, oflag);
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}
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#endif
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LIBCAMERA_PUBLIC int openat(int dirfd, const char *path, int oflag, ...)
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{
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mode_t mode = 0;
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if (oflag & O_CREAT || oflag & O_TMPFILE)
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extract_va_arg(mode_t, mode, oflag);
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return V4L2CompatManager::instance()->openat(dirfd, path, oflag, mode);
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}
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LIBCAMERA_PUBLIC int __openat_2(int dirfd, const char *path, int oflag)
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{
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return openat(dirfd, path, oflag);
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}
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#ifndef openat64
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LIBCAMERA_PUBLIC int openat64(int dirfd, const char *path, int oflag, ...)
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{
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mode_t mode = 0;
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if (oflag & O_CREAT || oflag & O_TMPFILE)
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extract_va_arg(mode_t, mode, oflag);
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return V4L2CompatManager::instance()->openat(dirfd, path,
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oflag | O_LARGEFILE, mode);
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}
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LIBCAMERA_PUBLIC int __openat64_2(int dirfd, const char *path, int oflag)
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{
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return openat(dirfd, path, oflag);
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}
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#endif
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LIBCAMERA_PUBLIC int dup(int oldfd)
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{
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return V4L2CompatManager::instance()->dup(oldfd);
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}
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LIBCAMERA_PUBLIC int close(int fd)
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{
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return V4L2CompatManager::instance()->close(fd);
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}
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LIBCAMERA_PUBLIC void *mmap(void *addr, size_t length, int prot, int flags,
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int fd, off_t offset)
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{
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return V4L2CompatManager::instance()->mmap(addr, length, prot, flags,
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fd, offset);
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}
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#ifndef mmap64
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LIBCAMERA_PUBLIC void *mmap64(void *addr, size_t length, int prot, int flags,
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int fd, off64_t offset)
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{
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return V4L2CompatManager::instance()->mmap(addr, length, prot, flags,
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fd, offset);
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}
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#endif
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LIBCAMERA_PUBLIC int munmap(void *addr, size_t length)
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{
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return V4L2CompatManager::instance()->munmap(addr, length);
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}
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LIBCAMERA_PUBLIC int ioctl(int fd, unsigned long request, ...)
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{
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void *arg;
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extract_va_arg(void *, arg, request);
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return V4L2CompatManager::instance()->ioctl(fd, request, arg);
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}
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}
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