mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-04 13:30:12 -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 */
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/* SPDX-FileCopyrightText: Copyright © 2021 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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/*
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* We need to export open* etc., but _FORTIFY_SOURCE defines conflicting
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* always_inline versions. Disable _FORTIFY_SOURCE for this file, so we
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* can define our overrides.
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*/
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#ifdef _FORTIFY_SOURCE
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#undef _FORTIFY_SOURCE
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#endif
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#include <assert.h>
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#include <stdbool.h>
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#include <stdio.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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#include "pipewire-v4l2.h"
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#define SPA_EXPORT __attribute__((visibility("default")))
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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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static inline 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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SPA_EXPORT 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 get_fops()->openat(AT_FDCWD, path, oflag, mode);
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}
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/* _FORTIFY_SOURCE redirects open to __open_2 */
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SPA_EXPORT 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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#ifndef open64
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SPA_EXPORT 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 get_fops()->openat(AT_FDCWD, path, oflag | O_LARGEFILE, mode);
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}
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SPA_EXPORT 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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#endif
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SPA_EXPORT 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 get_fops()->openat(dirfd, path, oflag, mode);
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}
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SPA_EXPORT 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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#ifndef openat64
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SPA_EXPORT 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 get_fops()->openat(dirfd, path, oflag | O_LARGEFILE, mode);
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}
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SPA_EXPORT 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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#endif
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SPA_EXPORT int dup(int oldfd)
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{
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return get_fops()->dup(oldfd);
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}
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SPA_EXPORT int close(int fd)
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{
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return get_fops()->close(fd);
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}
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SPA_EXPORT 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 get_fops()->mmap(addr, length, prot, flags, fd, offset);
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}
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#ifndef mmap64
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SPA_EXPORT 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 get_fops()->mmap(addr, length, prot, flags, fd, offset);
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}
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#endif
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SPA_EXPORT int munmap(void *addr, size_t length)
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{
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return get_fops()->munmap(addr, length);
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}
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SPA_EXPORT int ioctl(int fd, unsigned long int 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 get_fops()->ioctl(fd, request, arg);
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}
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