1 //===-- Implementation file for readv -------------------------------------===// 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 #include "src/sys/uio/readv.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/errno/libc_errno.h" 14 #include <sys/syscall.h> 15 16 namespace LIBC_NAMESPACE_DECL { 17 18 LLVM_LIBC_FUNCTION(ssize_t, readv, (int fd, const iovec *iov, int iovcnt)) { 19 long ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_readv, 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 read. 26 return static_cast<ssize_t>(ret); 27 } 28 29 } // namespace LIBC_NAMESPACE_DECL 30