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//===-- Implementation file for writev ------------------------------------===//
//
// 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/sys/uio/writev.h"
#include "hdr/types/ssize_t.h"
#include "hdr/types/struct_iovec.h"
#include "src/__support/OSUtil/syscall.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include <sys/syscall.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(ssize_t, writev, (int fd, const iovec *iov, int iovcnt)) {
long ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_writev, fd, iov, iovcnt);
// On failure, return -1 and set errno.
if (ret < 0) {
libc_errno = static_cast<int>(-ret);
return -1;
}
// On success, return number of bytes written.
return static_cast<ssize_t>(ret);
}
} // namespace LIBC_NAMESPACE_DECL
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