[libc-commits] [libc] 860a07b - [libc] Add stubs for POSIX netdb.h and getaddrinfo (#219337)
via libc-commits
libc-commits at lists.llvm.org
Thu Aug 27 18:48:57 PDT 2026
Author: Alexey Samsonov
Date: 2026-08-27T18:48:51-07:00
New Revision: 860a07be6da9ffe76625da2ad15e4e4e6ca6532c
URL: https://github.com/llvm/llvm-project/commit/860a07be6da9ffe76625da2ad15e4e4e6ca6532c
DIFF: https://github.com/llvm/llvm-project/commit/860a07be6da9ffe76625da2ad15e4e4e6ca6532c.diff
LOG: [libc] Add stubs for POSIX netdb.h and getaddrinfo (#219337)
* Add the `<netdb.h>` POSIX header and declare `struct addrinfo` and
`freeaddrinfo` and `getaddrinfo` methods
as defined in
https://pubs.opengroup.org/onlinepubs/9799919799/functions/getaddrinfo.html
;
* Provide Linux-specific definitions for `EAI_` macro family;
* Add header/entrypoints to the list of "experimental" (i.e. WIP)
entrypoints on Linux systems;
* Create the proxy header harness for types / Linux-specific macro.
* Provide stub implementations - no-op `freeaddrinfo` and `getaddrinfo`
that returns `EAI_SYSTEM` and sets errno to `ENOSYS`. Validate this
behavior in unit tests.
Assisted by automated tooling, human-reviewed
Added:
libc/hdr/netdb_macros.h
libc/hdr/types/struct_addrinfo.h
libc/include/llvm-libc-macros/linux/netdb-macros.h
libc/include/llvm-libc-macros/netdb-macros.h
libc/include/llvm-libc-types/struct_addrinfo.h
libc/include/netdb.yaml
libc/src/netdb/CMakeLists.txt
libc/src/netdb/freeaddrinfo.cpp
libc/src/netdb/freeaddrinfo.h
libc/src/netdb/getaddrinfo.cpp
libc/src/netdb/getaddrinfo.h
libc/test/src/netdb/CMakeLists.txt
libc/test/src/netdb/netdb_test.cpp
Modified:
libc/config/linux/aarch64/entrypoints.txt
libc/config/linux/aarch64/headers.txt
libc/config/linux/x86_64/entrypoints.txt
libc/config/linux/x86_64/headers.txt
libc/hdr/CMakeLists.txt
libc/hdr/types/CMakeLists.txt
libc/include/CMakeLists.txt
libc/include/llvm-libc-macros/CMakeLists.txt
libc/include/llvm-libc-macros/linux/CMakeLists.txt
libc/include/llvm-libc-types/CMakeLists.txt
libc/src/CMakeLists.txt
libc/test/src/CMakeLists.txt
Removed:
################################################################################
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 567025e62f43d..39d2588794d65 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -1381,6 +1381,10 @@ if(LLVM_LIBC_ENABLE_EXPERIMENTAL_ENTRYPOINTS)
libc.src.net.if_freenameindex
libc.src.net.if_nameindex
+ # netdb.h entrypoints
+ libc.src.netdb.freeaddrinfo
+ libc.src.netdb.getaddrinfo
+
# regex.h entrypoints
libc.src.regex.regcomp
libc.src.regex.regexec
diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
index b80ed913c5007..848ce7b257eac 100644
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -90,6 +90,7 @@ set(TARGET_PUBLIC_HEADERS
if(LLVM_LIBC_FULL_BUILD AND LLVM_LIBC_ENABLE_EXPERIMENTAL_ENTRYPOINTS)
list(APPEND TARGET_PUBLIC_HEADERS
+ libc.include.netdb
libc.include.regex
libc.include.sys_ptrace
)
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 6a37d8b2b48d6..53f169f18ea03 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -1612,6 +1612,10 @@ if(LLVM_LIBC_ENABLE_EXPERIMENTAL_ENTRYPOINTS)
libc.src.net.if_freenameindex
libc.src.net.if_nameindex
+ # netdb.h entrypoints
+ libc.src.netdb.freeaddrinfo
+ libc.src.netdb.getaddrinfo
+
# regex.h entrypoints
libc.src.regex.regcomp
libc.src.regex.regexec
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index 06ee91983ebd5..9f2c4c568b7dc 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -95,6 +95,7 @@ set(TARGET_PUBLIC_HEADERS
if(LLVM_LIBC_FULL_BUILD AND LLVM_LIBC_ENABLE_EXPERIMENTAL_ENTRYPOINTS)
list(APPEND TARGET_PUBLIC_HEADERS
+ libc.include.netdb
libc.include.regex
libc.include.sys_ptrace
)
diff --git a/libc/hdr/CMakeLists.txt b/libc/hdr/CMakeLists.txt
index dbc0a52d6414d..7f81ffd172261 100644
--- a/libc/hdr/CMakeLists.txt
+++ b/libc/hdr/CMakeLists.txt
@@ -88,6 +88,14 @@ add_proxy_header_library(
libc.include.llvm-libc-macros.net_if_macros
)
+add_proxy_header_library(
+ netdb_macros
+ HDRS
+ netdb_macros.h
+ FULL_BUILD_DEPENDS
+ libc.include.llvm-libc-macros.netdb_macros
+)
+
add_proxy_header_library(
netinet_in_macros
HDRS
diff --git a/libc/hdr/netdb_macros.h b/libc/hdr/netdb_macros.h
new file mode 100644
index 0000000000000..031772a53ad7a
--- /dev/null
+++ b/libc/hdr/netdb_macros.h
@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Proxy header for netdb macros.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_NETDB_MACROS_H
+#define LLVM_LIBC_HDR_NETDB_MACROS_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-macros/netdb-macros.h"
+
+#else // Overlay mode
+
+#include <netdb.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_NETDB_MACROS_H
diff --git a/libc/hdr/types/CMakeLists.txt b/libc/hdr/types/CMakeLists.txt
index 40a3c197b258a..dc15960c7a7f3 100644
--- a/libc/hdr/types/CMakeLists.txt
+++ b/libc/hdr/types/CMakeLists.txt
@@ -682,6 +682,14 @@ add_proxy_header_library(
libc.include.sys_socket
)
+add_proxy_header_library(
+ struct_addrinfo
+ HDRS
+ struct_addrinfo.h
+ FULL_BUILD_DEPENDS
+ libc.include.llvm-libc-types.struct_addrinfo
+)
+
add_proxy_header_library(
struct_sockaddr_storage
HDRS
diff --git a/libc/hdr/types/struct_addrinfo.h b/libc/hdr/types/struct_addrinfo.h
new file mode 100644
index 0000000000000..7ec1a65edbfb0
--- /dev/null
+++ b/libc/hdr/types/struct_addrinfo.h
@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Proxy header for struct addrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_TYPES_STRUCT_ADDRINFO_H
+#define LLVM_LIBC_HDR_TYPES_STRUCT_ADDRINFO_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/struct_addrinfo.h"
+
+#else
+
+#include <netdb.h>
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STRUCT_ADDRINFO_H
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index dc310b7ada387..3b423c41a7cf6 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -355,6 +355,16 @@ add_header_macro(
.llvm_libc_common_h
)
+add_header_macro(
+ netdb
+ ../libc/include/netdb.yaml
+ netdb.h
+ DEPENDS
+ .llvm_libc_common_h
+ .llvm-libc-macros.netdb_macros
+ .llvm-libc-types.struct_addrinfo
+)
+
add_header_macro(
regex
../libc/include/regex.yaml
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index b23b9626557b8..848aa2683a947 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -340,6 +340,12 @@ add_macro_header(
net-if-macros.h
)
+add_macro_header(
+ netdb_macros
+ HDR
+ netdb-macros.h
+)
+
add_macro_header(
sys_time_macros
HDR
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
index 8fcab45d13017..477c3fd112786 100644
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -76,6 +76,12 @@ add_header(
net-if-macros.h
)
+add_header(
+ netdb_macros
+ HDR
+ netdb-macros.h
+)
+
add_header(
sys_wait_macros
HDR
diff --git a/libc/include/llvm-libc-macros/linux/netdb-macros.h b/libc/include/llvm-libc-macros/linux/netdb-macros.h
new file mode 100644
index 0000000000000..7bc06982f4553
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/netdb-macros.h
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Macros defined in netdb.h header file for Linux.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_NETDB_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_NETDB_MACROS_H
+
+#define EAI_BADFLAGS -1
+#define EAI_NONAME -2
+#define EAI_AGAIN -3
+#define EAI_FAIL -4
+#define EAI_FAMILY -6
+#define EAI_SOCKTYPE -7
+#define EAI_SERVICE -8
+#define EAI_MEMORY -10
+#define EAI_SYSTEM -11
+#define EAI_OVERFLOW -12
+
+#endif // LLVM_LIBC_MACROS_LINUX_NETDB_MACROS_H
diff --git a/libc/include/llvm-libc-macros/netdb-macros.h b/libc/include/llvm-libc-macros/netdb-macros.h
new file mode 100644
index 0000000000000..46804d0eaec65
--- /dev/null
+++ b/libc/include/llvm-libc-macros/netdb-macros.h
@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Macros defined in netdb.h header file.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_NETDB_MACROS_H
+#define LLVM_LIBC_MACROS_NETDB_MACROS_H
+
+#ifdef __linux__
+#include "linux/netdb-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_NETDB_MACROS_H
diff --git a/libc/include/llvm-libc-types/CMakeLists.txt b/libc/include/llvm-libc-types/CMakeLists.txt
index 6d9733b124e02..02b9adf88bcac 100644
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -256,6 +256,7 @@ add_header(wctype_t HDR wctype_t.h)
add_header(sa_family_t HDR sa_family_t.h)
add_header(socklen_t HDR socklen_t.h)
add_header(struct_sockaddr HDR struct_sockaddr.h DEPENDS .sa_family_t)
+add_header(struct_addrinfo HDR struct_addrinfo.h DEPENDS .socklen_t .struct_sockaddr)
add_header(struct_sockaddr_in HDR struct_sockaddr_in.h DEPENDS .in_port_t .sa_family_t .struct_in_addr)
add_header(
struct_sockaddr_in6
diff --git a/libc/include/llvm-libc-types/struct_addrinfo.h b/libc/include/llvm-libc-types/struct_addrinfo.h
new file mode 100644
index 0000000000000..0c0233982b19e
--- /dev/null
+++ b/libc/include/llvm-libc-types/struct_addrinfo.h
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Definition of struct addrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_STRUCT_ADDRINFO_H
+#define LLVM_LIBC_TYPES_STRUCT_ADDRINFO_H
+
+#include "socklen_t.h"
+#include "struct_sockaddr.h"
+
+struct addrinfo {
+ int ai_flags;
+ int ai_family;
+ int ai_socktype;
+ int ai_protocol;
+ socklen_t ai_addrlen;
+ struct sockaddr *ai_addr;
+ char *ai_canonname;
+ struct addrinfo *ai_next;
+};
+
+#endif // LLVM_LIBC_TYPES_STRUCT_ADDRINFO_H
diff --git a/libc/include/netdb.yaml b/libc/include/netdb.yaml
new file mode 100644
index 0000000000000..b98f30fd1a2f2
--- /dev/null
+++ b/libc/include/netdb.yaml
@@ -0,0 +1,44 @@
+header: netdb.h
+standards:
+ - posix
+macros:
+ - macro_name: EAI_AGAIN
+ macro_header: netdb-macros.h
+ - macro_name: EAI_BADFLAGS
+ macro_header: netdb-macros.h
+ - macro_name: EAI_FAIL
+ macro_header: netdb-macros.h
+ - macro_name: EAI_FAMILY
+ macro_header: netdb-macros.h
+ - macro_name: EAI_MEMORY
+ macro_header: netdb-macros.h
+ - macro_name: EAI_NONAME
+ macro_header: netdb-macros.h
+ - macro_name: EAI_SERVICE
+ macro_header: netdb-macros.h
+ - macro_name: EAI_SOCKTYPE
+ macro_header: netdb-macros.h
+ - macro_name: EAI_SYSTEM
+ macro_header: netdb-macros.h
+ - macro_name: EAI_OVERFLOW
+ macro_header: netdb-macros.h
+types:
+ - type_name: struct_addrinfo
+enums: []
+objects: []
+functions:
+ - name: freeaddrinfo
+ standards:
+ - posix
+ return_type: void
+ arguments:
+ - type: struct addrinfo *
+ - name: getaddrinfo
+ standards:
+ - posix
+ return_type: int
+ arguments:
+ - type: const char *__restrict
+ - type: const char *__restrict
+ - type: const struct addrinfo *__restrict
+ - type: struct addrinfo **__restrict
diff --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index 4e7aaa1112ed7..1458658e360b7 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -49,6 +49,7 @@ endif()
add_subdirectory(assert)
add_subdirectory(compiler)
add_subdirectory(locale)
+add_subdirectory(netdb)
add_subdirectory(nl_types)
add_subdirectory(search)
add_subdirectory(regex)
diff --git a/libc/src/netdb/CMakeLists.txt b/libc/src/netdb/CMakeLists.txt
new file mode 100644
index 0000000000000..5533695158291
--- /dev/null
+++ b/libc/src/netdb/CMakeLists.txt
@@ -0,0 +1,26 @@
+add_entrypoint_object(
+ freeaddrinfo
+ SRCS
+ freeaddrinfo.cpp
+ HDRS
+ freeaddrinfo.h
+ DEPENDS
+ libc.hdr.types.struct_addrinfo
+ libc.src.__support.common
+ libc.src.__support.macros.config
+)
+
+add_entrypoint_object(
+ getaddrinfo
+ SRCS
+ getaddrinfo.cpp
+ HDRS
+ getaddrinfo.h
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.hdr.netdb_macros
+ libc.hdr.types.struct_addrinfo
+ libc.src.__support.common
+ libc.src.__support.macros.config
+ libc.src.errno.errno
+)
diff --git a/libc/src/netdb/freeaddrinfo.cpp b/libc/src/netdb/freeaddrinfo.cpp
new file mode 100644
index 0000000000000..9a0c2b060fdbb
--- /dev/null
+++ b/libc/src/netdb/freeaddrinfo.cpp
@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Implementation of freeaddrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/netdb/freeaddrinfo.h"
+#include "hdr/types/struct_addrinfo.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(void, freeaddrinfo,
+ ([[maybe_unused]] struct addrinfo * res)) {
+ // TODO: Implement freeaddrinfo.
+ return;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/netdb/freeaddrinfo.h b/libc/src/netdb/freeaddrinfo.h
new file mode 100644
index 0000000000000..b5c6fff778404
--- /dev/null
+++ b/libc/src/netdb/freeaddrinfo.h
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Implementation header for freeaddrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_NETDB_FREEADDRINFO_H
+#define LLVM_LIBC_SRC_NETDB_FREEADDRINFO_H
+
+#include "hdr/types/struct_addrinfo.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+void freeaddrinfo(struct addrinfo *res);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_NETDB_FREEADDRINFO_H
diff --git a/libc/src/netdb/getaddrinfo.cpp b/libc/src/netdb/getaddrinfo.cpp
new file mode 100644
index 0000000000000..c044e5023ca60
--- /dev/null
+++ b/libc/src/netdb/getaddrinfo.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Implementation of getaddrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/netdb/getaddrinfo.h"
+#include "hdr/errno_macros.h"
+#include "hdr/netdb_macros.h"
+#include "hdr/types/struct_addrinfo.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, getaddrinfo,
+ ([[maybe_unused]] const char *__restrict nodename,
+ [[maybe_unused]] const char *__restrict servname,
+ [[maybe_unused]] const struct addrinfo *__restrict hints,
+ [[maybe_unused]] struct addrinfo **__restrict res)) {
+ // TODO: Implement getaddrinfo.
+ libc_errno = ENOSYS;
+ return EAI_SYSTEM;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/netdb/getaddrinfo.h b/libc/src/netdb/getaddrinfo.h
new file mode 100644
index 0000000000000..713c052b91f41
--- /dev/null
+++ b/libc/src/netdb/getaddrinfo.h
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Implementation header for getaddrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_NETDB_GETADDRINFO_H
+#define LLVM_LIBC_SRC_NETDB_GETADDRINFO_H
+
+#include "hdr/types/struct_addrinfo.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int getaddrinfo(const char *__restrict nodename,
+ const char *__restrict servname,
+ const struct addrinfo *__restrict hints,
+ struct addrinfo **__restrict res);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_NETDB_GETADDRINFO_H
diff --git a/libc/test/src/CMakeLists.txt b/libc/test/src/CMakeLists.txt
index cdd262aa36473..94a5c79bb6eb9 100644
--- a/libc/test/src/CMakeLists.txt
+++ b/libc/test/src/CMakeLists.txt
@@ -116,6 +116,7 @@ add_subdirectory(assert)
add_subdirectory(compiler)
add_subdirectory(dirent)
add_subdirectory(locale)
+add_subdirectory(netdb)
add_subdirectory(nl_types)
add_subdirectory(signal)
add_subdirectory(regex)
diff --git a/libc/test/src/netdb/CMakeLists.txt b/libc/test/src/netdb/CMakeLists.txt
new file mode 100644
index 0000000000000..bb2113840d993
--- /dev/null
+++ b/libc/test/src/netdb/CMakeLists.txt
@@ -0,0 +1,18 @@
+add_custom_target(libc-netdb-tests)
+
+add_libc_test(
+ netdb_test
+ SUITE
+ libc-netdb-tests
+ SRCS
+ netdb_test.cpp
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.hdr.netdb_macros
+ libc.hdr.types.struct_addrinfo
+ libc.src.errno.errno
+ libc.src.netdb.freeaddrinfo
+ libc.src.netdb.getaddrinfo
+ libc.test.UnitTest.ErrnoCheckingTest
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
diff --git a/libc/test/src/netdb/netdb_test.cpp b/libc/test/src/netdb/netdb_test.cpp
new file mode 100644
index 0000000000000..b25a3cdc2a5f0
--- /dev/null
+++ b/libc/test/src/netdb/netdb_test.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Unittests for getaddrinfo and freeaddrinfo.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/errno_macros.h"
+#include "hdr/netdb_macros.h"
+#include "hdr/types/struct_addrinfo.h"
+#include "src/netdb/freeaddrinfo.h"
+#include "src/netdb/getaddrinfo.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcNetdbTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcNetdbTest, GetAddrInfoReturnsEaiSystem) {
+ struct addrinfo *res = nullptr;
+ ASSERT_THAT(LIBC_NAMESPACE::getaddrinfo("localhost", nullptr, nullptr, &res),
+ Fails(ENOSYS, EAI_SYSTEM));
+ EXPECT_EQ(res, nullptr);
+
+ // freeaddrinfo should do nothing and not crash.
+ LIBC_NAMESPACE::freeaddrinfo(res);
+}
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