r0 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./file1\x00', 0x882c2, 0x0)
fallocate(r0, 0x0, 0x0, 0x1000002)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000100)='./file1\x00', 0x0, 0x0)
r2 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000040), 0xa8281, 0x0)
sendfile(r2, r1, 0x0, 0x100000000)