1 | //===-- Linux implementation of recv --------------------------------------===// |
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 | |
9 | #include "src/sys/socket/recv.h" |
10 | |
11 | #include <linux/net.h> // For SYS_SOCKET socketcall number. |
12 | #include <sys/syscall.h> // For syscall numbers. |
13 | |
14 | #include "hdr/types/socklen_t.h" |
15 | #include "hdr/types/ssize_t.h" |
16 | #include "hdr/types/struct_sockaddr.h" |
17 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
18 | #include "src/__support/common.h" |
19 | #include "src/__support/libc_errno.h" |
20 | #include "src/__support/macros/sanitizer.h" |
21 | |
22 | namespace LIBC_NAMESPACE_DECL { |
23 | |
24 | LLVM_LIBC_FUNCTION(ssize_t, recv, |
25 | (int sockfd, void *buf, size_t len, int flags)) { |
26 | #ifdef SYS_recv |
27 | ssize_t ret = |
28 | LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_recv, sockfd, buf, len, flags); |
29 | #elif defined(SYS_recvfrom) |
30 | ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>( |
31 | SYS_recvfrom, sockfd, buf, len, flags, nullptr, nullptr); |
32 | #elif defined(SYS_socketcall) |
33 | unsigned long sockcall_args[4] = { |
34 | static_cast<unsigned long>(sockfd), reinterpret_cast<unsigned long>(buf), |
35 | static_cast<unsigned long>(len), static_cast<unsigned long>(flags)}; |
36 | ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_socketcall, SYS_RECV, |
37 | sockcall_args); |
38 | #else |
39 | #error "socket and socketcall syscalls unavailable for this platform." |
40 | #endif |
41 | if (ret < 0) { |
42 | libc_errno = static_cast<int>(-ret); |
43 | return -1; |
44 | } |
45 | |
46 | MSAN_UNPOISON(buf, ret); |
47 | |
48 | return ret; |
49 | } |
50 | |
51 | } // namespace LIBC_NAMESPACE_DECL |
52 | |