1 //===-- Implementation of open --------------------------------------------===// 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/fcntl/open.h" 10 11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 12 #include "src/__support/common.h" 13 #include "src/__support/macros/config.h" 14 #include "src/errno/libc_errno.h" 15 16 #include "hdr/fcntl_macros.h" 17 #include "hdr/types/mode_t.h" 18 #include <stdarg.h> 19 #include <sys/syscall.h> // For syscall numbers. 20 21 namespace LIBC_NAMESPACE_DECL { 22 23 LLVM_LIBC_FUNCTION(int, open, (const char *path, int flags, ...)) { 24 mode_t mode_flags = 0; 25 // O_TMPFILE is a multi-bit flag so we test all bits by checking for equality 26 // with O_TMPFILE 27 if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE) { 28 va_list varargs; 29 va_start(varargs, flags); 30 mode_flags = va_arg(varargs, mode_t); 31 va_end(varargs); 32 } 33 34 #ifdef SYS_open 35 int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_open, path, flags, mode_flags); 36 #else 37 int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_openat, AT_FDCWD, path, flags, 38 mode_flags); 39 #endif 40 if (fd > 0) 41 return fd; 42 43 libc_errno = -fd; 44 return -1; 45 } 46 47 } // namespace LIBC_NAMESPACE_DECL 48