1//===--- Linux implementation of the Dir helpers --------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/__support/File/dir.h"
10
11#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
12#include "src/__support/error_or.h"
13#include "src/__support/macros/config.h"
14
15#include "hdr/fcntl_macros.h" // For open flags
16#include <sys/syscall.h> // For syscall numbers
17
18namespace LIBC_NAMESPACE_DECL {
19
20ErrorOr<int> platform_opendir(const char *name) {
21 int open_flags = O_RDONLY | O_DIRECTORY | O_CLOEXEC;
22#ifdef SYS_open
23 int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_open, name, open_flags);
24#elif defined(SYS_openat)
25 int fd =
26 LIBC_NAMESPACE::syscall_impl<int>(SYS_openat, AT_FDCWD, name, open_flags);
27#else
28#error \
29 "SYS_open and SYS_openat syscalls not available to perform an open operation."
30#endif
31
32 if (fd < 0) {
33 return LIBC_NAMESPACE::Error(-fd);
34 }
35 return fd;
36}
37
38ErrorOr<size_t> platform_fetch_dirents(int fd, cpp::span<uint8_t> buffer) {
39#ifdef SYS_getdents64
40 long size = LIBC_NAMESPACE::syscall_impl<long>(SYS_getdents64, fd,
41 buffer.data(), buffer.size());
42#else
43#error "getdents64 syscalls not available to perform a fetch dirents operation."
44#endif
45
46 if (size < 0) {
47 return LIBC_NAMESPACE::Error(static_cast<int>(-size));
48 }
49 return size;
50}
51
52int platform_closedir(int fd) {
53 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_close, fd);
54 if (ret < 0) {
55 return static_cast<int>(-ret);
56 }
57 return 0;
58}
59
60} // namespace LIBC_NAMESPACE_DECL
61

source code of libc/src/__support/File/linux/dir.cpp