openat 275
mkdirat (__NR_openat + 1)
mknodat (__NR_openat + 2)
fchownat (__NR_openat + 3)
futimesat (__NR_openat + 4)
newfstatat (__NR_openat + 5)
fstatat64 (__NR_openat + 5)
unlinkat (__NR_openat + 6)
renameat (__NR_openat + 7)
linkat (__NR_openat + 8)
symlinkat (__NR_openat + 9)
readlinkat (__NR_openat + 10)
fchmodat (__NR_openat + 11)
faccessat (__NR_openat + 12)
splice 291
tee 293
vmsplice 294
memfd_create 340