[libc] add headers sys/auxv sys/prctl and sys/time

These headers are uncommonly used, and from extensions, but some basic
support is needed. Macros have been added where available.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D135731

9 files changed, 219 insertions, 0 deletions

diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 4d77ddf27d59..35e84b7ec97e 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -229,6 +229,15 @@ add_gen_header(
 file(MAKE_DIRECTORY "sys")
 
 add_gen_header(
+  sys_auxv
+  DEF_FILE sys/auxv.h.def
+  GEN_HDR sys/auxv.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-macros.sys_auxv_macros
+)
+
+add_gen_header(
   sys_ioctl
   DEF_FILE sys/ioctl.h.def
   GEN_HDR sys/ioctl.h
@@ -249,6 +258,14 @@ add_gen_header(
 )
 
 add_gen_header(
+  sys_prctl
+  DEF_FILE sys/prctl.h.def
+  GEN_HDR sys/prctl.h
+  DEPENDS
+    .llvm_libc_common_h
+)
+
+add_gen_header(
   sys_random
   DEF_FILE sys/random.h.def
   GEN_HDR sys/random.h
@@ -302,6 +319,16 @@ add_gen_header(
 )
 
 add_gen_header(
+  sys_time
+  DEF_FILE sys/time.h.def
+  GEN_HDR sys/time.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-types.struct_timeval
+    .llvm-libc-macros.sys_time_macros
+)
+
+add_gen_header(
   sys_utsname
   DEF_FILE sys/utsname.h.def
   GEN_HDR sys/utsname.h
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index 2b69a3b60644..8e8dbae0d852 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -37,6 +37,12 @@ add_header(
 )
 
 add_header(
+  sys_auxv_macros
+  HDR
+    sys-auxv-macros.h
+)
+
+add_header(
   sys_ioctl_macros
   HDR
     sys-ioctl-macros.h
@@ -78,6 +84,14 @@ add_header(
 )
 
 add_header(
+  sys_time_macros
+  HDR
+    sys-time-macros.h
+  DEPENDS
+    .linux.sys_time_macros
+)
+
+add_header(
   sys_wait_macros
   HDR
     sys-wait-macros.h
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
index 5857290f333a..52b826837027 100644
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -53,6 +53,12 @@ add_header(
 )
 
 add_header(
+  sys_time_macros
+  HDR
+    sys-time-macros.h
+)
+
+add_header(
   unistd_macros
   HDR
     unistd-macros.h
diff --git a/libc/include/llvm-libc-macros/linux/sys-time-macros.h b/libc/include/llvm-libc-macros/linux/sys-time-macros.h
new file mode 100644
index 000000000000..06ae43f0e005
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/sys-time-macros.h
@@ -0,0 +1,53 @@
+//===-- Definition of macros from sys/time.h ------------------------------===//
+//
+// 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_MACROS_LINUX_SYS_TIME_MACROS_H
+#define __LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
+
+// Add two timevals and put the result in timeval_ptr_result. If the resulting
+// usec value is greater than 999,999 then the microseconds are turned into full
+// seconds (1,000,000 is subtracted from usec and 1 is added to sec).
+#define timeradd(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
+  (timeval_ptr_result)->tv_sec =                                               \
+      (timeval_ptr_a)->tv_sec + (timeval_ptr_b)->tv_sec +                      \
+      (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000 ? 1    \
+                                                                        : 0);  \
+  (timeval_ptr_result)->tv_usec =                                              \
+      (timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec -                    \
+      (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000        \
+           ? 1000000                                                           \
+           : 0);
+
+// Subtract two timevals and put the result in timeval_ptr_result. If the
+// resulting usec value is less than 0 then 1,000,000 is added to usec and 1 is
+// subtracted from sec.
+#define timersub(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
+  (timeval_ptr_result)->tv_sec =                                               \
+      (timeval_ptr_a)->tv_sec - (timeval_ptr_b)->tv_sec -                      \
+      (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1 : 0);     \
+  (timeval_ptr_result)->tv_usec =                                              \
+      (timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec +                    \
+      (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1000000     \
+                                                                 : 0);
+
+// Reset a timeval to the epoch.
+#define timerclear(timeval_ptr)                                                \
+  (timeval_ptr)->tv_sec = 0;                                                   \
+  (timeval_ptr)->tv_usec = 0;
+
+// Determine if a timeval is set to the epoch.
+#define timerisset(timeval_ptr)                                                \
+  (timeval_ptr)->tv_sec != 0 || (timeval_ptr)->tv_usec != 0;
+
+// Compare two timevals using CMP.
+#define timercmp(timeval_ptr_a, timeval_ptr_b, CMP)                            \
+  (((timeval_ptr_a)->tv_sec == (timeval_ptr_b)->tv_sec)                        \
+       ? ((timeval_ptr_a)->tv_usec CMP(timeval_ptr_b)->tv_usec)                \
+       : ((timeval_ptr_a)->tv_sec CMP(timeval_ptr_b)->tv_sec))
+
+#endif // __LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
diff --git a/libc/include/llvm-libc-macros/sys-auxv-macros.h b/libc/include/llvm-libc-macros/sys-auxv-macros.h
new file mode 100644
index 000000000000..a57c6018ea0a
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-auxv-macros.h
@@ -0,0 +1,43 @@
+//===-- Macros defined in sys/auxv.h header file --------------------------===//
+//
+// 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_MACROS_AUXV_MACROS_H
+#define __LLVM_LIBC_MACROS_AUXV_MACROS_H
+
+// Macros defining the aux vector indexes.
+#define AT_NULL 0
+#define AT_IGNORE 1
+#define AT_EXECFD 2
+#define AT_PHDR 3
+#define AT_PHENT 4
+#define AT_PHNUM 5
+#define AT_PAGESZ 6
+#define AT_BASE 7
+#define AT_FLAGS 8
+#define AT_ENTRY 9
+#define AT_NOTELF 10
+#define AT_UID 11
+#define AT_EUID 12
+#define AT_GID 13
+#define AT_EGID 14
+#define AT_PLATFORM 15
+#define AT_HWCAP 16
+#define AT_CLKTCK 17
+
+#define AT_SECURE 23
+#define AT_BASE_PLATFORM 24
+#define AT_RANDOM 25
+#define AT_HWCAP2 26
+
+#define AT_EXECFN 31
+
+#ifndef AT_MINSIGSTKSZ
+#define AT_MINSIGSTKSZ 51
+#endif
+
+#endif // __LLVM_LIBC_MACROS_AUXV_MACROS_H
diff --git a/libc/include/llvm-libc-macros/sys-time-macros.h b/libc/include/llvm-libc-macros/sys-time-macros.h
new file mode 100644
index 000000000000..5254cab0ad22
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-time-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in sys/time.h header file --------------------------===//
+//
+// 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_MACROS_SYS_TIME_MACROS_H
+#define __LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
+
+#ifdef __unix__
+#include "linux/sys-time-macros.h"
+#endif
+
+#endif // __LLVM_LIBC_MACROS_SYS_TIME_MACROS_H
diff --git a/libc/include/sys/auxv.h.def b/libc/include/sys/auxv.h.def
new file mode 100644
index 000000000000..504c2f68cb1e
--- /dev/null
+++ b/libc/include/sys/auxv.h.def
@@ -0,0 +1,18 @@
+//===-- GNU header auxv.h -------------------------------------------------===//
+//
+// 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_SYS_AUXV_H
+#define LLVM_LIBC_SYS_AUXV_H
+
+#include <__llvm-libc-common.h>
+
+#include <llvm-libc-macros/sys-auxv-macros.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_AUXV_H
diff --git a/libc/include/sys/prctl.h.def b/libc/include/sys/prctl.h.def
new file mode 100644
index 000000000000..3c29719837ca
--- /dev/null
+++ b/libc/include/sys/prctl.h.def
@@ -0,0 +1,22 @@
+//===-- Linux header prctl.h ----------------------------------------------===//
+//
+// 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_SYS_PRCTL_H
+#define LLVM_LIBC_SYS_PRCTL_H
+
+#include <__llvm-libc-common.h>
+
+// Process control is highly platform specific, so the platform usually defines
+// the macros itself.
+#include <linux/prctl.h>
+
+// TODO: Define the prctl macros.
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_PRCTL_H
diff --git a/libc/include/sys/time.h.def b/libc/include/sys/time.h.def
new file mode 100644
index 000000000000..9a3bd7bb49f8
--- /dev/null
+++ b/libc/include/sys/time.h.def
@@ -0,0 +1,20 @@
+//===-- Linux header time.h -----------------------------------------------===//
+//
+// 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_SYS_TIME_H
+#define LLVM_LIBC_SYS_TIME_H
+
+#include <__llvm-libc-common.h>
+
+#include <llvm-libc-types/struct_timeval.h>
+
+#include <llvm-libc-macros/sys-time-macros.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_SYS_TIME_H