[Sanitizers] Implement clock_getcpuclockid

[vitalybuka]

compiler-rt/test/sanitizer_common/TestCases/Linux/clock_gettime.c

2

could you please to put GETCPUCLOCKID test into a separate file?

[guiand]

Split off the test into its own file

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

enum {
     CIMT_FILE
   } type;
   union {
     FileMetadata file;
   };
 };
 
 #if SI_POSIX
 typedef AddrHashMap<CommonInterceptorMetadata, 31051> MetadataHashMap;
 
 static MetadataHashMap *interceptor_metadata_map;
 
 UNUSED static void SetInterceptorMetadata(__sanitizer_FILE *addr,
                                           const FileMetadata &file) {
   MetadataHashMap::Handle h(interceptor_metadata_map, (uptr)addr);
   CHECK(h.created());
   h->type = CommonInterceptorMetadata::CIMT_FILE;
   h->file = file;
 }
 
 UNUSED static const FileMetadata *GetInterceptorMetadata(
     __sanitizer_FILE *addr) {

 
 UNUSED static void DeleteInterceptorMetadata(void *addr) {
   MetadataHashMap::Handle h(interceptor_metadata_map, (uptr)addr, true);
   CHECK(h.exists());
 }
 #endif  // SI_POSIX
 
 #if SANITIZER_INTERCEPT_STRLEN
 INTERCEPTOR(SIZE_T, strlen, const char *s) {
   // Sometimes strlen is called prior to InitializeCommonInterceptors,
   // in which case the REAL(strlen) typically used in
   // COMMON_INTERCEPTOR_ENTER will fail.  We use internal_strlen here
   // to handle that.
   if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
     return internal_strlen(s);
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strlen, s);
   SIZE_T result = REAL(strlen)(s);
   if (common_flags()->intercept_strlen)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, s, result + 1);
   return result;
 }
 #define INIT_STRLEN COMMON_INTERCEPT_FUNCTION(strlen)
 #else
 #define INIT_STRLEN
 #endif
 
 #if SANITIZER_INTERCEPT_STRNLEN
 INTERCEPTOR(SIZE_T, strnlen, const char *s, SIZE_T maxlen) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strnlen, s, maxlen);
   SIZE_T length = REAL(strnlen)(s, maxlen);
   if (common_flags()->intercept_strlen)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, s, Min(length + 1, maxlen));
   return length;
 }
 #define INIT_STRNLEN COMMON_INTERCEPT_FUNCTION(strnlen)
 #else
 #define INIT_STRNLEN
 #endif
 
 #if SANITIZER_INTERCEPT_STRNDUP
 INTERCEPTOR(char*, strndup, const char *s, uptr size) {
   void *ctx;
   COMMON_INTERCEPTOR_STRNDUP_IMPL(ctx, s, size);
 }
 #define INIT_STRNDUP COMMON_INTERCEPT_FUNCTION(strndup)
 #else
 #define INIT_STRNDUP
 #endif // SANITIZER_INTERCEPT_STRNDUP
 

 #define INIT_CLOCK_GETTIME                  \
   COMMON_INTERCEPT_FUNCTION(clock_getres);  \
   COMMON_INTERCEPT_FUNCTION(clock_gettime); \
   COMMON_INTERCEPT_FUNCTION(clock_settime);
 #else
 #define INIT_CLOCK_GETTIME
 #endif
 
+#if SANITIZER_INTERCEPT_CLOCK_GETCPUCLOCKID
+INTERCEPTOR(int, clock_getcpuclockid, pid_t pid, __sanitizer_clockid_t *clockid) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, clock_getcpuclockid, pid, clockid);
+  int res = REAL(clock_getcpuclockid)(pid, clockid);
+  if (!res && clockid) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, clockid, sizeof *clockid);
+  }
+  return res;
+}
+
+#define INIT_CLOCK_GETCPUCLOCKID                  \
+  COMMON_INTERCEPT_FUNCTION(clock_getcpuclockid);
+#else
+#define INIT_CLOCK_GETCPUCLOCKID
+#endif
+
 #if SANITIZER_INTERCEPT_GETITIMER
 INTERCEPTOR(int, getitimer, int which, void *curr_value) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, getitimer, which, curr_value);
   // FIXME: under ASan the call below may write to freed memory and corrupt
   // its metadata. See
   // https://github.com/google/sanitizers/issues/321.
   int res = REAL(getitimer)(which, curr_value);
#endif
   INIT_GETPWNAM_R_AND_FRIENDS;
   INIT_GETPWENT;
   INIT_FGETPWENT;
   INIT_GETPWENT_R;
   INIT_FGETPWENT_R;
   INIT_FGETGRENT_R;
   INIT_SETPWENT;
   INIT_CLOCK_GETTIME;
+  INIT_CLOCK_GETCPUCLOCKID;
   INIT_GETITIMER;
   INIT_TIME;
   INIT_GLOB;
   INIT_GLOB64;
   INIT_WAIT;
   INIT_WAIT4;
   INIT_INET;
   INIT_PTHREAD_GETSCHEDPARAM;

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

 #define SANITIZER_INTERCEPT_GETPWENT_R \
   (SI_FREEBSD || SI_NETBSD || SI_OPENBSD || SI_LINUX_NOT_ANDROID || SI_SOLARIS)
 #define SANITIZER_INTERCEPT_FGETPWENT_R \
   (SI_FREEBSD || SI_OPENBSD || SI_LINUX_NOT_ANDROID || SI_SOLARIS)
 #define SANITIZER_INTERCEPT_SETPWENT \
   (SI_MAC || SI_LINUX_NOT_ANDROID || SI_SOLARIS)
 #define SANITIZER_INTERCEPT_CLOCK_GETTIME \
   (SI_FREEBSD || SI_NETBSD || SI_OPENBSD || SI_LINUX || SI_SOLARIS)
+#define SANITIZER_INTERCEPT_CLOCK_GETCPUCLOCKID SI_LINUX
 #define SANITIZER_INTERCEPT_GETITIMER SI_POSIX
 #define SANITIZER_INTERCEPT_TIME SI_POSIX
 #define SANITIZER_INTERCEPT_GLOB SI_LINUX_NOT_ANDROID || SI_SOLARIS
 #define SANITIZER_INTERCEPT_GLOB64 SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_WAIT SI_POSIX
 #define SANITIZER_INTERCEPT_INET SI_POSIX
 #define SANITIZER_INTERCEPT_PTHREAD_GETSCHEDPARAM (SI_POSIX && !SI_OPENBSD)
 #define SANITIZER_INTERCEPT_GETADDRINFO SI_POSIX

compiler-rt/test/sanitizer_common/TestCases/Linux/clock_gettime.c

 // RUN: %clang %s -Wl,-as-needed -o %t && %run %t
-// Regression test for PR15823
-// (http://llvm.org/bugs/show_bug.cgi?id=15823).
 #include <stdio.h>
 #include <time.h>
+#include <unistd.h>
+#include <assert.h>
 
-int main() {
+// Regression test for PR15823
+// (http://llvm.org/bugs/show_bug.cgi?id=15823).
+long system_ns() {
   struct timespec ts;
   clock_gettime(CLOCK_REALTIME, &ts);
+  return ts.tv_nsec;
+}
+
+long cpu_ns() {
+  clockid_t clk;
+  struct timespec ts;
+  int res = clock_getcpuclockid(getpid(), &clk);
+  assert(!res);
+  res = clock_gettime(clk, &ts);
+  assert(!res);
+  return ts.tv_nsec;
+}
+
+int main() {
+  long sysns = system_ns();
+  asm volatile ("" :: "r"(sysns));
+
+  long cpuns = cpu_ns();
+  asm volatile ("" :: "r"(cpuns));
   return 0;
 }