| //===-- Implementation of open --------------------------------------------===// |
| // |
| // 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 "src/fcntl/open.h" |
| |
| #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
| #include "src/__support/common.h" |
| #include "src/errno/libc_errno.h" |
| |
| #include <fcntl.h> |
| #include <stdarg.h> |
| #include <sys/syscall.h> // For syscall numbers. |
| |
| namespace __llvm_libc { |
| |
| LLVM_LIBC_FUNCTION(int, open, (const char *path, int flags, ...)) { |
| mode_t mode_flags = 0; |
| // O_TMPFILE is a multi-bit flag so we test all bits by checking for equality |
| // with O_TMPFILE |
| if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE) { |
| va_list varargs; |
| va_start(varargs, flags); |
| mode_flags = va_arg(varargs, mode_t); |
| va_end(varargs); |
| } |
| |
| #ifdef SYS_open |
| int fd = __llvm_libc::syscall_impl(SYS_open, path, flags, mode_flags); |
| #else |
| int fd = |
| __llvm_libc::syscall_impl(SYS_openat, AT_FDCWD, path, flags, mode_flags); |
| #endif |
| if (fd > 0) |
| return fd; |
| |
| libc_errno = -fd; |
| return -1; |
| } |
| |
| } // namespace __llvm_libc |