Add gettimeofday example

gettimeofday/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(ldc_gettimeofday)
+
+target_sources(app PRIVATE src/main.c)
+
+if(${ARCH} STREQUAL "posix" OR ${ARCH} STREQUAL "x86")
+    set(ldc_target i686-unknown-none-newlibeabi)
+elseif(CONFIG_CPU_CORTEX_M)
+    if(CONFIG_CPU_CORTEX_M3)
+        set(ldc_target thumbv7em-unknown-none-newlibeabi)
+    else()
+        message(FATAL_ERROR "Unknown Cortex-M target")
+    endif()
+else()
+    message(FATAL_ERROR "ARCH ${ARCH} not supported")
+endif()
+
+include(ExternalProject)
+set(ldc_src_dir ${CMAKE_CURRENT_SOURCE_DIR})
+ExternalProject_Add(
+    ldc_project
+    PREFIX  ${CMAKE_CURRENT_BINARY_DIR}
+    SOURCE_DIR  ${ldc_src_dir}
+    BUILD_IN_SOURCE 1
+    BUILD_ALWAYS    1
+    CONFIGURE_COMMAND   ""
+    BUILD_COMMAND
+        dub
+        build
+        -f
+        -b debug
+        --compiler=ldc2
+        --arch=${ldc_target}
+    INSTALL_COMMAND ""
+    BUILD_BYPRODUCTS    ${ldc_src_dir}/lib/libgettimeofday_d.a
+)
+
+add_library(ldc_lib STATIC IMPORTED GLOBAL)
+add_dependencies(
+    ldc_lib
+    ldc_project
+)
+set_target_properties(ldc_lib PROPERTIES IMPORTED_LOCATION ${ldc_src_dir}/lib/libgettimeofday_d.a)
+target_link_libraries(app PUBLIC ldc_lib)

gettimeofday/README.md

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+# gettimeofday example
+
+```console
+west build -b qemu_cortex_m3 gettimeofday
+west build -t run
+```
+
+See [networking with qemu section](https://docs.zephyrproject.org/latest/connectivity/networking/qemu_setup.html#networking-with-qemu) too.
+
+creating helper socket.
+
+```console
+./loop-socat.sh
+```

gettimeofday/dub.sdl

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+name "gettimeofday"
+authors "Hiroki Noda"
+license "BSL-1.0"
+targetType "staticLibrary"
+targetPath "lib"
+targetName "gettimeofday_d"
+dependency "zephyr-core" path="../zephyr-core"

gettimeofday/ldc2.conf

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+default:
+{
+    switches = [
+        "--betterC",
+        "--float-abi=soft",
+        "--relocation-model=static",
+        "--defaultlib="
+    ];
+    post-switches = [
+        "-I%%ldcbinarypath%%/../import",
+    ];
+    lib-dirs = [];
+}

gettimeofday/prj.conf

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+# General config
+CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_NEWLIB_LIBC=y
+CONFIG_POSIX_API=y
+CONFIG_LINKER_ORPHAN_SECTION_PLACE=y
+CONFIG_SNTP=y
+CONFIG_NET_CONFIG_CLOCK_SNTP_INIT=y
+CONFIG_NET_CONFIG_SNTP_INIT_SERVER="time.nist.gov"
+CONFIG_NET_CONFIG_SNTP_INIT_RESYNC=y
+
+# Networking config
+CONFIG_NETWORKING=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_TCP=y
+CONFIG_NET_SOCKETS=y
+
+CONFIG_DNS_RESOLVER=y
+CONFIG_DNS_SERVER_IP_ADDRESSES=y
+CONFIG_DNS_SERVER1="192.0.2.2"
+
+# Network driver config
+CONFIG_TEST_RANDOM_GENERATOR=y
+
+# Network address config
+CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_NET_CONFIG_NEED_IPV4=y
+CONFIG_NET_CONFIG_MY_IPV4_ADDR="192.0.2.1"
+CONFIG_NET_CONFIG_PEER_IPV4_ADDR="192.0.2.2"
+CONFIG_NET_CONFIG_MY_IPV4_GW="192.0.2.2"
+
+# Network debug config
+CONFIG_NET_LOG=y

gettimeofday/src/app.d

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+import zephyr.core.stdc.stdio;
+import zephyr.core.stdc.errno;
+import zephyr.core.sys.posix.time;
+import zephyr.core.sys.posix.sys.time;
+import zephyr.core.sys.posix.sys.types;
+import zephyr.core.sys.posix.unistd;
+
+extern(C):
+@nogc:
+nothrow:
+
+int d_main()
+ {
+    timeval tv = void;
+
+    while (true)
+    {
+        int res = gettimeofday(&tv, null);
+        time_t now = time(null);
+        tm tm = void;
+        localtime_r(&now, &tm);
+
+        if (res < 0)
+        {
+            printf("Error in gettimeofday(): %d\n", errno);
+            return 1;
+        }
+
+		printf("gettimeofday(): HI(tv_sec)=%d, LO(tv_sec)=%d, "
+		       ~ "tv_usec=%d\n\t%s\n", cast(uint)(tv.tv_sec >> 32),
+		       cast(uint)tv.tv_sec, cast(uint)tv.tv_usec,
+		       asctime(&tm));
+		sleep(1);
+    }
+}

gettimeofday/src/main.c

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+extern int d_main();
+
+int main() {
+    return d_main();
+}