| 1 | //===-- Linux implementation of recvmsg -----------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/sys/socket/recvmsg.h" |
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| 10 | |
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| 11 | #include <linux/net.h> // For SYS_SOCKET socketcall number. |
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| 12 | #include <sys/syscall.h> // For syscall numbers. |
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| 13 | |
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| 14 | #include "hdr/types/ssize_t.h" |
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| 15 | #include "hdr/types/struct_msghdr.h" |
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| 16 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
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| 17 | #include "src/__support/common.h" |
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| 18 | #include "src/__support/libc_errno.h" |
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| 19 | #include "src/__support/macros/sanitizer.h" |
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| 20 | |
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| 21 | namespace LIBC_NAMESPACE_DECL { |
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| 22 | |
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| 23 | LLVM_LIBC_FUNCTION(ssize_t, recvmsg, (int sockfd, msghdr *msg, int flags)) { |
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| 24 | #ifdef SYS_recvmsg |
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| 25 | ssize_t ret = |
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| 26 | LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_recvmsg, sockfd, msg, flags); |
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| 27 | #elif defined(SYS_socketcall) |
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| 28 | unsigned long sockcall_args[3] = {static_cast<unsigned long>(sockfd), |
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| 29 | reinterpret_cast<unsigned long>(msg), |
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| 30 | static_cast<unsigned long>(flags)}; |
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| 31 | ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>( |
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| 32 | SYS_socketcall, SYS_RECVMSG, sockcall_args); |
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| 33 | #else |
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| 34 | #error "socket and socketcall syscalls unavailable for this platform." |
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| 35 | #endif |
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| 36 | if (ret < 0) { |
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| 37 | libc_errno = static_cast<int>(-ret); |
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| 38 | return -1; |
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| 39 | } |
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| 40 | |
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| 41 | // Unpoison the msghdr, as well as all its components. |
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| 42 | MSAN_UNPOISON(msg, sizeof(msghdr)); |
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| 43 | MSAN_UNPOISON(msg->msg_name, msg->msg_namelen); |
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| 44 | |
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| 45 | for (size_t i = 0; i < msg->msg_iovlen; ++i) { |
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| 46 | MSAN_UNPOISON(msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len); |
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| 47 | } |
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| 48 | MSAN_UNPOISON(msg->msg_control, msg->msg_controllen); |
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| 49 | |
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| 50 | return ret; |
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| 51 | } |
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| 52 | |
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| 53 | } // namespace LIBC_NAMESPACE_DECL |
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| 54 | |
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