[compiler-rt] Reland "[Sanitizers] Intercept timer_create" (#113710) (PR #116717)

[Vitaly Buka via llvm-commits]

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@@ -2289,6 +2289,61 @@ INTERCEPTOR(int, pthread_getcpuclockid, uptr thread,
 #define INIT_CLOCK_GETCPUCLOCKID
 #endif
 
+#if SANITIZER_INTERCEPT_TIMER_CREATE
+INTERCEPTOR(int, timer_create, __sanitizer_clockid_t clockid, void *sevp,
+            __sanitizer_timer_t *timer) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, timer_create, clockid, sevp, timer);
+  int res = REAL(timer_create)(clockid, sevp, timer);
+  if (!res && timer) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, timer, sizeof *timer);
+  }
+  return res;
+}
+
+INTERCEPTOR(int, timer_delete, __sanitizer_timer_t timer) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, timer_delete, timer);
+  int res = REAL(timer_delete)(timer);
+  return res;
+}
+
+INTERCEPTOR(int, timer_gettime, __sanitizer_timer_t timer,
+            struct __sanitizer_itimerspec *curr_value) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, timer_gettime, timer, curr_value);
+  int res = REAL(timer_gettime)(timer, curr_value);
+  if (!res && curr_value) {
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, curr_value, sizeof *curr_value);
+  }
+  return res;
+}
+
+INTERCEPTOR(int, timer_settime, __sanitizer_timer_t timer, int flags,
+            const struct __sanitizer_itimerspec *new_value,
+            struct __sanitizer_itimerspec *old_value) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, timer_settime, timer, flags, new_value,
+                           old_value);
+  int res = REAL(timer_settime)(timer, flags, new_value, old_value);
+  if (!res) {
+    if (new_value)
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, new_value, sizeof *new_value);
+    if (old_value)
+      COMMON_INTERCEPTOR_WRITE_RANGE(ctx, old_value, sizeof *old_value);
+  }
+  return res;
+}
+
+#  define INIT_TIMER_CREATE                                                \
+    COMMON_INTERCEPT_FUNCTION_GLIBC_VER_MIN(timer_create, "GLIBC_2.3.3");  \
----------------
vitalybuka wrote:

do we want to use GLIBC_VER_MIN then, maybe always default?

https://github.com/llvm/llvm-project/pull/116717