[libc] Implement timespec_get

libc/config/baremetal/arm/entrypoints.txt

@@ -209,6 +209,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.time.gmtime
     libc.src.time.gmtime_r
     libc.src.time.mktime
+    libc.src.time.timespec_get
 
     # internal entrypoints
     libc.startup.baremetal.init

libc/config/baremetal/riscv/entrypoints.txt

@@ -205,6 +205,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.time.gmtime
     libc.src.time.gmtime_r
     libc.src.time.mktime
+    libc.src.time.timespec_get
 
     # internal entrypoints
     libc.startup.baremetal.init

libc/config/linux/aarch64/entrypoints.txt

@@ -999,6 +999,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.time.mktime
     libc.src.time.nanosleep
     libc.src.time.time
+    libc.src.time.timespec_get
 
     # unistd.h entrypoints
     libc.src.unistd.__llvm_libc_syscall

libc/config/linux/riscv/entrypoints.txt

@@ -937,6 +937,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.time.mktime
     libc.src.time.nanosleep
     libc.src.time.time
+    libc.src.time.timespec_get
 
     # unistd.h entrypoints
     libc.src.unistd.__llvm_libc_syscall

libc/config/linux/x86_64/entrypoints.txt

@@ -1082,6 +1082,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.time.mktime
     libc.src.time.nanosleep
     libc.src.time.time
+    libc.src.time.timespec_get
 
     # locale.h entrypoints
     libc.src.locale.localeconv

libc/include/llvm-libc-macros/time-macros.h

@@ -7,4 +7,6 @@
 #include "linux/time-macros.h"
 #endif
 
+#define TIME_UTC 1
+
 #endif // LLVM_LIBC_MACROS_TIME_MACROS_H

libc/newhdrgen/yaml/time.yaml

@@ -96,3 +96,10 @@ functions:
     return_type: time_t
     arguments:
       - type: time_t *
+  - name: timespec_get
+    standard:
+      - stdc
+    return_type: int
+    arguments:
+      - type: struct timespec *
+      - type: int

libc/src/__support/OSUtil/baremetal/CMakeLists.txt

@@ -3,8 +3,10 @@ add_object_library(
   SRCS
     io.cpp
     exit.cpp
+    time.cpp
   HDRS
     io.h
+    time.h
   DEPENDS
     libc.src.__support.common
     libc.src.__support.CPP.string_view

libc/src/__support/OSUtil/baremetal/time.cpp

@@ -0,0 +1,23 @@
+//===---------- Baremetal implementation of time utils ----------*- C++ -*-===//
+//
+// 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 "time.h"
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+extern "C" int __llvm_libc_timespec_get_utc(struct timespec *ts);
+
+bool timespec_get_utc(struct timespec *ts) {
+  return __llvm_libc_timespec_get_utc(ts);
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL

libc/src/__support/OSUtil/baremetal/time.h

@@ -0,0 +1,23 @@
+//===---------- Baremetal implementation of time utils ----------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_BAREMETAL_TIME_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_BAREMETAL_TIME_H
+
+#include "include/llvm-libc-types/struct_timespec.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+bool timespec_get_utc(struct timespec *ts);
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_BAREMETAL_IO_H

libc/src/time/CMakeLists.txt

@@ -111,6 +111,13 @@ add_entrypoint_object(
     .${LIBC_TARGET_OS}.time
 )
 
+add_entrypoint_object(
+  timespec_get
+  ALIAS
+  DEPENDS
+    .${LIBC_TARGET_OS}.timespec_get
+)
+
 add_entrypoint_object(
   clock
   ALIAS

libc/src/time/baremetal/CMakeLists.txt

@@ -0,0 +1,11 @@
+add_entrypoint_object(
+  timespec_get
+  SRCS
+    timespec_get.cpp
+  HDRS
+    ../timespec_get.h
+  DEPENDS
+    libc.hdr.time_macros
+    libc.hdr.types.struct_timespec
+    libc.src.__support.OSUtil.osutil
+)

libc/src/time/baremetal/timespec_get.cpp

@@ -0,0 +1,28 @@
+//===-- Implementation of timespec_get for baremetal ----------------------===//
+//
+// 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/time/timespec_get.h"
+#include "hdr/time_macros.h"
+#include "src/__support/OSUtil/baremetal/time.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, timespec_get, (struct timespec * ts, int base)) {
+  if (base != TIME_UTC) {
+    return 0;
+  }
+
+  if (!internal::timespec_get_utc(ts)) {
+    return 0;
+  }
+  return base;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/src/time/linux/CMakeLists.txt

@@ -11,6 +11,19 @@ add_entrypoint_object(
     libc.src.errno.errno
 )
 
+add_entrypoint_object(
+  timespec_get
+  SRCS
+    timespec_get.cpp
+  HDRS
+    ../timespec_get.h
+  DEPENDS
+    libc.hdr.time_macros
+    libc.hdr.types.struct_timespec
+    libc.src.__support.time.linux.clock_gettime
+    libc.src.errno.errno
+)
+
 add_entrypoint_object(
   clock
   SRCS

libc/src/time/linux/timespec_get.cpp

@@ -0,0 +1,31 @@
+//===-- Implementation of timespec_get for Linux --------------------------===//
+//
+// 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/time/timespec_get.h"
+#include "hdr/time_macros.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/time/linux/clock_gettime.h"
+#include "src/errno/libc_errno.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, timespec_get, (struct timespec * ts, int base)) {
+  if (base != TIME_UTC) {
+    return 0;
+  }
+
+  auto result = internal::clock_gettime(CLOCK_REALTIME, ts);
+  if (!result.has_value()) {
+    libc_errno = result.error();
+    return 0;
+  }
+  return base;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/src/time/timespec_get.h

@@ -0,0 +1,21 @@
+//===-- Implementation header of timespec_get -------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_TIME_TIMESPEC_GET_H
+#define LLVM_LIBC_SRC_TIME_TIMESPEC_GET_H
+
+#include "src/__support/macros/config.h"
+#include <time.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+int timespec_get(struct timespec *ts, int base);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_TIME_TIMESPEC_GET_H

libc/test/src/time/CMakeLists.txt

@@ -162,6 +162,16 @@ add_libc_unittest(
     libc.src.errno.errno
 )
 
+add_libc_test(
+  timespec_get_test
+  SUITE
+    libc_time_unittests
+  SRCS
+    timespec_get_test.cpp
+  DEPENDS
+    libc.src.time.timespec_get
+)
+
 add_libc_test(
   clock_test
   SUITE

libc/test/src/time/timespec_get_test.cpp

@@ -0,0 +1,32 @@
+//===-- Unittests for timespec_get ----------------------------------------===//
+//
+// 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/__support/macros/properties/architectures.h"
+#include "src/time/timespec_get.h"
+#include "test/UnitTest/Test.h"
+
+#include <time.h>
+
+TEST(LlvmLibcTimespecGet, Utc) {
+#ifndef LIBC_TARGET_ARCH_IS_GPU
+  timespec ts;
+  int result;
+  result = LIBC_NAMESPACE::timespec_get(&ts, TIME_UTC);
+  ASSERT_EQ(result, TIME_UTC);
+  ASSERT_GT(ts.tv_sec, time_t(0));
+#endif
+}
+
+TEST(LlvmLibcTimespecGet, Unknown) {
+#ifndef LIBC_TARGET_ARCH_IS_GPU
+  timespec ts;
+  int result;
+  result = LIBC_NAMESPACE::timespec_get(&ts, 0);
+  ASSERT_EQ(result, 0);
+#endif
+}