commit 1f40be97b16ff895a50f48ae8dd1745f57688b6b
author Tao Bao <tbao@google.com> Thu Dec 04 15:24:28 2014 -0800
committer Tao Bao <tbao@google.com> Thu Dec 04 15:24:28 2014 -0800
tree 90bf09026ded666938ba1c2682370fcbaa14d02c
parent 6bec3484ee1e90662c8c5e52c71fcdc430a7b619

Add cache related sysconf queries

Several cache related queries are added, such as
_SC_LEVEL1_DCACHE_LINESIZE, _SC_LEVEL1_DCACHE_SIZE and etc. For the
moment, we always return 0 for these queries.

Change-Id: I36f67af8128672d8c1eef49d6f2431cca5a94719

libc/bionic/sysconf.cpp

diff --git a/libc/bionic/sysconf.cpp b/libc/bionic/sysconf.cpp
index 67f48e7..4180721 100644
--- a/libc/bionic/sysconf.cpp
+++ b/libc/bionic/sysconf.cpp
@@ -178,6 +178,24 @@
     case _SC_XOPEN_STREAMS:     return -1;            // Obsolescent in POSIX.1-2008.
     case _SC_XOPEN_UUCP:        return -1;
 
+    // We do not have actual implementations for cache queries.
+    // It's valid to return 0 as the result is unknown.
+    case _SC_LEVEL1_ICACHE_SIZE:      return 0;
+    case _SC_LEVEL1_ICACHE_ASSOC:     return 0;
+    case _SC_LEVEL1_ICACHE_LINESIZE:  return 0;
+    case _SC_LEVEL1_DCACHE_SIZE:      return 0;
+    case _SC_LEVEL1_DCACHE_ASSOC:     return 0;
+    case _SC_LEVEL1_DCACHE_LINESIZE:  return 0;
+    case _SC_LEVEL2_CACHE_SIZE:       return 0;
+    case _SC_LEVEL2_CACHE_ASSOC:      return 0;
+    case _SC_LEVEL2_CACHE_LINESIZE:   return 0;
+    case _SC_LEVEL3_CACHE_SIZE:       return 0;
+    case _SC_LEVEL3_CACHE_ASSOC:      return 0;
+    case _SC_LEVEL3_CACHE_LINESIZE:   return 0;
+    case _SC_LEVEL4_CACHE_SIZE:       return 0;
+    case _SC_LEVEL4_CACHE_ASSOC:      return 0;
+    case _SC_LEVEL4_CACHE_LINESIZE:   return 0;
+
     default:
       // Posix says EINVAL is the only error that shall be returned,
       // but glibc uses ENOSYS.

libc/include/sys/sysconf.h

diff --git a/libc/include/sys/sysconf.h b/libc/include/sys/sysconf.h
index 8aa506e..ca32132 100644
--- a/libc/include/sys/sysconf.h
+++ b/libc/include/sys/sysconf.h
@@ -172,6 +172,22 @@
 #define _SC_XOPEN_STREAMS       0x008d
 #define _SC_XOPEN_UUCP          0x008e
 
+#define _SC_LEVEL1_ICACHE_SIZE      0x008f
+#define _SC_LEVEL1_ICACHE_ASSOC     0x0090
+#define _SC_LEVEL1_ICACHE_LINESIZE  0x0091
+#define _SC_LEVEL1_DCACHE_SIZE      0x0092
+#define _SC_LEVEL1_DCACHE_ASSOC     0x0093
+#define _SC_LEVEL1_DCACHE_LINESIZE  0x0094
+#define _SC_LEVEL2_CACHE_SIZE       0x0095
+#define _SC_LEVEL2_CACHE_ASSOC      0x0096
+#define _SC_LEVEL2_CACHE_LINESIZE   0x0097
+#define _SC_LEVEL3_CACHE_SIZE       0x0098
+#define _SC_LEVEL3_CACHE_ASSOC      0x0099
+#define _SC_LEVEL3_CACHE_LINESIZE   0x009a
+#define _SC_LEVEL4_CACHE_SIZE       0x009b
+#define _SC_LEVEL4_CACHE_ASSOC      0x009c
+#define _SC_LEVEL4_CACHE_LINESIZE   0x009d
+
 long sysconf(int);
 
 __END_DECLS