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//===-- Linux implementation of recvmsg -----------------------------------===//
//
// 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/socket/recvmsg.h"
#include <linux/net.h> // For SYS_SOCKET socketcall number.
#include <sys/syscall.h> // For syscall numbers.
#include "hdr/types/ssize_t.h"
#include "hdr/types/struct_msghdr.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/sanitizer.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(ssize_t, recvmsg, (int sockfd, msghdr *msg, int flags)) {
#ifdef SYS_recvmsg
ssize_t ret =
LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_recvmsg, sockfd, msg, flags);
#elif defined(SYS_socketcall)
unsigned long sockcall_args[3] = {static_cast<unsigned long>(sockfd),
reinterpret_cast<unsigned long>(msg),
static_cast<unsigned long>(flags)};
ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(
SYS_socketcall, SYS_RECVMSG, sockcall_args);
#else
#error "socket and socketcall syscalls unavailable for this platform."
#endif
if (ret < 0) {
libc_errno = static_cast<int>(-ret);
return -1;
}
// Unpoison the msghdr, as well as all its components.
MSAN_UNPOISON(msg, sizeof(msghdr));
MSAN_UNPOISON(msg->msg_name, msg->msg_namelen);
for (size_t i = 0; i < msg->msg_iovlen; ++i) {
MSAN_UNPOISON(msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len);
}
MSAN_UNPOISON(msg->msg_control, msg->msg_controllen);
return ret;
}
} // namespace LIBC_NAMESPACE_DECL
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