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//===--- Linux implementation of the Dir helpers --------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "dir.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/error_or.h"
#include <fcntl.h> // For open flags
#include <sys/syscall.h> // For syscall numbers
namespace __llvm_libc {
ErrorOr<int> platform_opendir(const char *name) {
int open_flags = O_RDONLY | O_DIRECTORY | O_CLOEXEC;
#ifdef SYS_open
int fd = __llvm_libc::syscall_impl(SYS_open, name, open_flags);
#elif defined(SYS_openat)
int fd = __llvm_libc::syscall_impl(SYS_openat, AT_FDCWD, name, open_flags);
#else
#error \
"SYS_open and SYS_openat syscalls not available to perform an open operation."
#endif
if (fd < 0) {
return __llvm_libc::Error(-fd);
}
return fd;
}
ErrorOr<size_t> platform_fetch_dirents(int fd, cpp::span<uint8_t> buffer) {
long size =
__llvm_libc::syscall_impl(SYS_getdents, fd, buffer.data(), buffer.size());
if (size < 0) {
return __llvm_libc::Error(static_cast<int>(-size));
}
return size;
}
int platform_closedir(int fd) {
long ret = __llvm_libc::syscall_impl(SYS_close, fd);
if (ret < 0) {
return static_cast<int>(-ret);
}
return 0;
}
} // namespace __llvm_libc
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