7b9a58e6cf
The fdopendir function takes a file descriptor opened on a directory, then opens a DIR* on it. Needed for #191075 Assisted-by: Automated tooling, human reviewed.
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
//===--- Implementation of a platform independent Dir data structure ------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "dir.h"
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#include "src/__support/CPP/mutex.h" // lock_guard
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#include "src/__support/CPP/new.h"
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#include "src/__support/alloc-checker.h"
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#include "src/__support/error_or.h"
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#include "src/__support/libc_errno.h" // For error macros
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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ErrorOr<Dir *> Dir::fdopen(int fd) {
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LIBC_NAMESPACE::AllocChecker ac;
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Dir *dir = new (ac) Dir(fd);
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if (!ac)
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return LIBC_NAMESPACE::Error(ENOMEM);
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return dir;
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}
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ErrorOr<Dir *> Dir::open(const char *path) {
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auto fd = platform_opendir(path);
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if (!fd)
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return LIBC_NAMESPACE::Error(fd.error());
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return Dir::fdopen(fd.value());
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}
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ErrorOr<struct dirent *> Dir::read() {
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cpp::lock_guard lock(mutex);
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if (readptr >= fillsize) {
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auto readsize = platform_fetch_dirents(fd, buffer);
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if (!readsize)
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return LIBC_NAMESPACE::Error(readsize.error());
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fillsize = readsize.value();
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readptr = 0;
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}
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if (fillsize == 0)
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return nullptr;
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struct dirent *d = reinterpret_cast<struct dirent *>(buffer + readptr);
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#ifdef __linux__
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// The d_reclen field is available on Linux but not required by POSIX.
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readptr += d->d_reclen;
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#else
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// Other platforms have to implement how the read pointer is to be updated.
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#error "DIR read pointer update is missing."
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#endif
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return d;
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}
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int Dir::close() {
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{
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cpp::lock_guard lock(mutex);
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int retval = platform_closedir(fd);
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if (retval != 0)
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return retval;
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}
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delete this;
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return 0;
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}
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} // namespace LIBC_NAMESPACE_DECL
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