Revert "[compiler-rt] adding preadv2/pwritev2 interceptions." (#99085)

Reverts #97216

Author: mysterymath

compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

@@ -10264,38 +10264,6 @@ INTERCEPTOR(int, cpuset_getaffinity, int level, int which, __int64_t id, SIZE_T
 #define INIT_CPUSET_GETAFFINITY
 #endif
 
-#if SANITIZER_INTERCEPT_PREADV2
-INTERCEPTOR(SSIZE_T, preadv2, int fd, __sanitizer_iovec *iov, int iovcnt,
-            OFF_T offset, int flags) {
-  void *ctx;
-  COMMON_INTERCEPTOR_ENTER(ctx, preadv2, fd, iov, iovcnt, offset, flags);
-  COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd);
-  SSIZE_T res = REAL(preadv2)(fd, iov, iovcnt, offset, flags);
-  if (res > 0) write_iovec(ctx, iov, iovcnt, res);
-  if (res >= 0 && fd >= 0) COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd);
-  return res;
-}
-#define INIT_PREADV2 COMMON_INTERCEPT_FUNCTION(preadv2)
-#else
-#define INIT_PREADV2
-#endif
-
-#if SANITIZER_INTERCEPT_PWRITEV2
-INTERCEPTOR(SSIZE_T, pwritev2, int fd, __sanitizer_iovec *iov, int iovcnt,
-            OFF_T offset, int flags) {
-  void *ctx;
-  COMMON_INTERCEPTOR_ENTER(ctx, pwritev2, fd, iov, iovcnt, offset, flags);
-  COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd);
-  if (fd >= 0) COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd);
-  SSIZE_T res = REAL(pwritev2)(fd, iov, iovcnt, offset, flags);
-  if (res > 0) read_iovec(ctx, iov, iovcnt, res);
-  return res;
-}
-#define INIT_PWRITEV2 COMMON_INTERCEPT_FUNCTION(pwritev2)
-#else
-#define INIT_PWRITEV2
-#endif
-
 #include "sanitizer_common_interceptors_netbsd_compat.inc"
 
 namespace __sanitizer {
@@ -10615,8 +10583,6 @@ static void InitializeCommonInterceptors() {
   INIT___XUNAME;
   INIT_ARGP_PARSE;
   INIT_CPUSET_GETAFFINITY;
-  INIT_PREADV2;
-  INIT_PWRITEV2;
 
   INIT___PRINTF_CHK;
 }

compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

@@ -598,9 +598,6 @@
 #define SANITIZER_INTERCEPT_PROCCTL SI_FREEBSD
 #define SANITIZER_INTERCEPT_ARGP_PARSE SI_GLIBC
 #define SANITIZER_INTERCEPT_CPUSET_GETAFFINITY SI_FREEBSD
-// FIXME: also available from musl 1.2.5
-#define SANITIZER_INTERCEPT_PREADV2 SI_GLIBC
-#define SANITIZER_INTERCEPT_PWRITEV2 SI_GLIBC
 
 // This macro gives a way for downstream users to override the above
 // interceptor macros irrespective of the platform they are on. They have