cdb05b3712
_FORTIFY_SOURCE redirects the open*() calls to __open*_2() functions. The libcamera V4L2 adaptation layer intercepts those functions to support applications compiled with _FORTIFY_SOURCE. When _FORTIFY_SOURCE is not enabled, the C library headers will not provide declarations for the fortified functions, which will cause missing declaration warnings when we unable them. Fix this by disabling the -Wmissing-declarations warnings selectively for the _FORTIFY_SOURCE functions. To avoid sparkling pragmas around, move the relevant function definitions next to each other. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
165 lines
3.5 KiB
C++
165 lines
3.5 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 compatibility layer
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*/
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#include "v4l2_compat_manager.h"
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#include <assert.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/ioctl.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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#include <unistd.h>
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#include <libcamera/base/utils.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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namespace {
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/*
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* Determine if the flags require a further mode arguments that needs to be
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* parsed from va_args.
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*/
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bool needs_mode(int flags)
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{
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return (flags & O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
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}
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} /* namespace */
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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 (needs_mode(oflag))
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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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#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 (needs_mode(oflag))
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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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#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 (needs_mode(oflag))
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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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#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 (needs_mode(oflag))
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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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#endif
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/*
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* _FORTIFY_SOURCE redirects open* to __open*_2. Disable the
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* -Wmissing-declarations warnings, as the functions won't be declared if
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* _FORTIFY_SOURCE is not in use.
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*/
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wmissing-declarations"
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LIBCAMERA_PUBLIC int __open_2(const char *path, int oflag)
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{
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assert(!needs_mode(oflag));
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return open(path, oflag);
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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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assert(!needs_mode(oflag));
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return open64(path, oflag);
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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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assert(!needs_mode(oflag));
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return openat(dirfd, path, oflag);
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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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assert(!needs_mode(oflag));
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return openat64(dirfd, path, oflag);
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}
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#pragma GCC diagnostic pop
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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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