gcc d.c && sudo dtruss ./a.out 
dtrace: system integrity protection is on, some features will not be available

SYSCALL(args) 		 = return
src 3  dst 4
c 14053376  p 20344832  h 20344832  d 6291456
total bytes copied 14053376 / 27551296
access("/AppleInternal/XBS/.isChrooted\0", 0x0, 0x0)		 = -1 2
bsdthread_register(0x7FF801A75F5C, 0x7FF801A75F48, 0x2000)		 = 1073742303 0
shm_open(0x7FF801943F5D, 0x0, 0x194278A)		 = 3 0
fstat64(0x3, 0x7FF7BE802250, 0x0)		 = 0 0
mmap(0x0, 0x2000, 0x1, 0x40001, 0x3, 0x0)		 = 0x107C0E000 0
close(0x3)		 = 0 0
ioctl(0x2, 0x4004667A, 0x7FF7BE802304)		 = 0 0
mprotect(0x107C15000, 0x1000, 0x0)		 = 0 0
mprotect(0x107C21000, 0x1000, 0x0)		 = 0 0
mprotect(0x107C22000, 0x1000, 0x0)		 = 0 0
mprotect(0x107C2E000, 0x1000, 0x0)		 = 0 0
mprotect(0x107C2F000, 0x1000, 0x0)		 = 0 0
mprotect(0x107C3B000, 0x1000, 0x0)		 = 0 0
mprotect(0x107C10000, 0x90, 0x1)		 = 0 0
mprotect(0x107C10000, 0x90, 0x3)		 = 0 0
mprotect(0x107C10000, 0x90, 0x1)		 = 0 0
mprotect(0x107C3C000, 0x1000, 0x1)		 = 0 0
mprotect(0x107C3D000, 0x90, 0x1)		 = 0 0
mprotect(0x107C3D000, 0x90, 0x3)		 = 0 0
mprotect(0x107C3D000, 0x90, 0x1)		 = 0 0
mprotect(0x107C10000, 0x90, 0x3)		 = 0 0
mprotect(0x107C10000, 0x90, 0x1)		 = 0 0
mprotect(0x107C3C000, 0x1000, 0x3)		 = 0 0
mprotect(0x107C3C000, 0x1000, 0x1)		 = 0 0
issetugid(0x0, 0x0, 0x0)		 = 0 0
getentropy(0x7FF7BE8021E0, 0x20, 0x0)		 = 0 0
getentropy(0x7FF7BE802240, 0x40, 0x0)		 = 0 0
getpid(0x0, 0x0, 0x0)		 = 65055 0
stat64("/AppleInternal\0", 0x7FF7BE802820, 0x0)		 = -1 2
csops_audittoken(0xFE1F, 0x10, 0x7FF7BE802360)		 = -1 22
proc_info(0x2, 0xFE1F, 0xD)		 = 64 0
csops_audittoken(0xFE1F, 0x10, 0x7FF7BE802430)		 = -1 22
sysctlbyname(kern.osvariant_status, 0x15, 0x7FF7BE802868, 0x7FF7BE802870, 0x0)		 = 0 0
csops(0xFE1F, 0x0, 0x7FF7BE8028A4)		 = 0 0
mprotect(0x107B0C000, 0x100000, 0x1)		 = 0 0
open("cc1\0", 0x0, 0x0)		 = 3 0
open("cc1-sparse\0", 0x202, 0x1C0)		 = 4 0
getrlimit(0x1008, 0x7FF7BE803590, 0x0)		 = 0 0
fstat64(0x1, 0x7FF7BE803578, 0x0)		 = 0 0
ioctl(0x1, 0x4004667A, 0x7FF7BE8035C4)		 = 0 0
dtrace: error on enabled probe ID 1700 (ID 963: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
lseek(0x3, 0x0, 0x4)		 = 6291456 0
lseek(0x3, 0x600000, 0x3)		 = 20344832 0
lseek(0x3, 0x600000, 0x0)		 = 6291456 0
lseek(0x4, 0x600000, 0x0)		 = 6291456 0
dtrace: error on enabled probe ID 1701 (ID 175: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 1699 (ID 177: syscall::write:return): invalid kernel access in action #12 at DIF offset 68
lseek(0x3, 0x0, 0x1)		 = 20344832 0
dtrace: error on enabled probe ID 1700 (ID 963: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
lseek(0x3, 0x1367000, 0x4)		 = -1 6
lseek(0x3, 0xFFFFFFFFFFFFFFFF, 0x3)		 = -1 22
lseek(0x3, 0xFFFFFFFFFFFFFFFF, 0x0)		 = -1 22
lseek(0x4, 0xFFFFFFFFFFFFFFFF, 0x0)		 = -1 22
lseek(0x3, 0x0, 0x2)		 = 27551296 0
ftruncate(0x4, 0x1A46640, 0x0)		 = 0 0
close(0x3)		 = 0 0
close(0x4)		 = 0 0
dtrace: error on enabled probe ID 1700 (ID 963: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68