mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-05 13:30:02 -05:00
7674b15fab
This commit moves the check that determines whether the mode argument of `open*()` exists into a separate function. With that, the check is fixed because previously it failed to account for the fact that `O_TMPFILE` is not a power of two. Furthermore, add `assert()`s in the fortified variants that ensure that no mode is required by the specified flags.
139 lines
3 KiB
C
139 lines
3 KiB
C
/* PipeWire */
|
|
/* SPDX-FileCopyrightText: Copyright © 2021 Wim Taymans */
|
|
/* SPDX-License-Identifier: MIT */
|
|
|
|
/*
|
|
* 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 <assert.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.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); \
|
|
}
|
|
|
|
static inline bool needs_mode(int flags)
|
|
{
|
|
return (flags & O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
|
|
}
|
|
|
|
SPA_EXPORT int open(const char *path, int oflag, ...)
|
|
{
|
|
mode_t mode = 0;
|
|
if (needs_mode(oflag))
|
|
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)
|
|
{
|
|
assert(!needs_mode(oflag));
|
|
return open(path, oflag);
|
|
}
|
|
|
|
#ifndef open64
|
|
SPA_EXPORT int open64(const char *path, int oflag, ...)
|
|
{
|
|
mode_t mode = 0;
|
|
if (needs_mode(oflag))
|
|
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)
|
|
{
|
|
assert(!needs_mode(oflag));
|
|
return open64(path, oflag);
|
|
}
|
|
#endif
|
|
|
|
SPA_EXPORT 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 get_fops()->openat(dirfd, path, oflag, mode);
|
|
}
|
|
|
|
SPA_EXPORT int __openat_2(int dirfd, const char *path, int oflag)
|
|
{
|
|
assert(!needs_mode(oflag));
|
|
return openat(dirfd, path, oflag);
|
|
}
|
|
|
|
#ifndef openat64
|
|
SPA_EXPORT 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 get_fops()->openat(dirfd, path, oflag | O_LARGEFILE, mode);
|
|
}
|
|
|
|
SPA_EXPORT int __openat64_2(int dirfd, const char *path, int oflag)
|
|
{
|
|
assert(!needs_mode(oflag));
|
|
return openat64(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);
|
|
}
|