30 lines · cpp
1//===-- Implementation file for writev ------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8#include "src/sys/uio/writev.h"9#include "hdr/types/ssize_t.h"10#include "hdr/types/struct_iovec.h"11#include "src/__support/OSUtil/syscall.h"12#include "src/__support/common.h"13#include "src/__support/libc_errno.h"14#include <sys/syscall.h>15 16namespace LIBC_NAMESPACE_DECL {17 18LLVM_LIBC_FUNCTION(ssize_t, writev, (int fd, const iovec *iov, int iovcnt)) {19 long ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_writev, fd, iov, iovcnt);20 // On failure, return -1 and set errno.21 if (ret < 0) {22 libc_errno = static_cast<int>(-ret);23 return -1;24 }25 // On success, return number of bytes written.26 return static_cast<ssize_t>(ret);27}28 29} // namespace LIBC_NAMESPACE_DECL30