diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -6538,17 +6538,42 @@
   }
   return res;
 }
-#define INIT_SEM                                                               \
-  COMMON_INTERCEPT_FUNCTION(sem_init);                                         \
-  COMMON_INTERCEPT_FUNCTION(sem_destroy);                                      \
-  COMMON_INTERCEPT_FUNCTION(sem_wait);                                         \
-  COMMON_INTERCEPT_FUNCTION(sem_trywait);                                      \
-  COMMON_INTERCEPT_FUNCTION(sem_timedwait);                                    \
-  COMMON_INTERCEPT_FUNCTION(sem_post);                                         \
-  COMMON_INTERCEPT_FUNCTION(sem_getvalue);
-#else
-#define INIT_SEM
-#endif // SANITIZER_INTERCEPT_SEM
+
+INTERCEPTOR(__sanitizer_sem_t *, sem_open, const char *name, int oflag, ...) {
+  void *ctx;
+  va_list ap;
+  va_start(ap, oflag);
+  u32 mode = va_arg(ap, u32);
+  u32 value = va_arg(ap, u32);
+  COMMON_INTERCEPTOR_ENTER(ctx, sem_open, name, oflag, mode, value);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  __sanitizer_sem_t *s = REAL(sem_open)(name, oflag, mode, value);
+  if (s)
+    COMMON_INTERCEPTOR_INITIALIZE_RANGE(s, sizeof(*s));
+  va_end(ap);
+  return s;
+}
+
+INTERCEPTOR(int, sem_unlink, const char *name) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, sem_unlink, name);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, name, REAL(strlen)(name) + 1);
+  return REAL(sem_unlink)(name);
+}
+
+#  define INIT_SEM                            \
+    COMMON_INTERCEPT_FUNCTION(sem_init);      \
+    COMMON_INTERCEPT_FUNCTION(sem_destroy);   \
+    COMMON_INTERCEPT_FUNCTION(sem_wait);      \
+    COMMON_INTERCEPT_FUNCTION(sem_trywait);   \
+    COMMON_INTERCEPT_FUNCTION(sem_timedwait); \
+    COMMON_INTERCEPT_FUNCTION(sem_post);      \
+    COMMON_INTERCEPT_FUNCTION(sem_getvalue);  \
+    COMMON_INTERCEPT_FUNCTION(sem_open);      \
+    COMMON_INTERCEPT_FUNCTION(sem_unlink);
+#else
+#  define INIT_SEM
+#endif  // SANITIZER_INTERCEPT_SEM
 
 #if SANITIZER_INTERCEPT_PTHREAD_SETCANCEL
 INTERCEPTOR(int, pthread_setcancelstate, int state, int *oldstate) {
diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/sem_open.cpp b/compiler-rt/test/sanitizer_common/TestCases/Posix/sem_open.cpp
new file mode 100644
--- /dev/null
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/sem_open.cpp
@@ -0,0 +1,23 @@
+// RUN: %clangxx -O0 %s -o %t && %run %t
+
+#include <assert.h>
+#include <fcntl.h>
+#include <semaphore.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main() {
+  char name[1024];
+  sprintf(name, "/sem_open_test_%d", getpid());
+
+  sem_t *s1 = sem_open(name, O_CREAT, 0644, 123);
+  assert(s1 != SEM_FAILED);
+
+  sem_t *s2 = sem_open(name, O_CREAT, 0644, 123);
+  assert(s2 != SEM_FAILED);
+
+  assert(sem_close(s1) == 0);
+  assert(sem_close(s2) == 0);
+
+  assert(sem_unlink(name) == 0);
+}