fstatat() not intercepted (with glibc >= 2.33?)

[mgorny]

It looks like libfaketime does not intercept fstatat().

This can be reproduced with the following example:

#include <fcntl.h>
#include <sys/stat.h>
#include <stdio.h>

int main() {
	struct stat st;

	stat("1", &st);
	printf("%ld\n", st.st_mtime);
	fstatat(AT_FDCWD, "1", &st, 0);
	printf("%ld\n", st.st_mtime);

	return 0;
}

$ touch 1
$ FAKETIME='2024-01-01 00:00:00' LD_PRELOAD=/tmp/libfaketime/src/libfaketime.so.1 ./a.out 
1704063600
1727378293

Apparently the code is referring to __fxstatat*() but it looks like glibc is using plain fstatat and fstatat64 since 2.33:

$ readelf -W -s /usr/lib64/libc.so.6  | grep f.*statat
   607: 00000000001043f0    50 FUNC    WEAK   DEFAULT   13 fstatat@@GLIBC_2.33
   725: 00000000001043f0    50 FUNC    WEAK   DEFAULT   13 fstatat64@@GLIBC_2.33
  2588: 00000000001163a0   100 FUNC    GLOBAL DEFAULT   13 __fxstatat@@GLIBC_2.4
  3033: 00000000001163a0   100 FUNC    GLOBAL DEFAULT   13 __fxstatat64@@GLIBC_2.4