...

fork()                                           = 5745 (0x1671)
read(5,"OK Pleased to meet you, process 5678\n",1002) = 37 (0x25)
write(8,"OPTION grab",11)                        = 11 (0xb)
write(8,"\n",1)                                  = 1 (0x1)
read(5,"OK\n",1002)                              = 3 (0x3)
write(8,"OPTION ttyname=/dev/pts/3",25)          = 25 (0x19)
write(8,"\n",1)                                  = 1 (0x1)
read(5,"OK\n",1002)                              = 3 (0x3)

...

write(8,"SETPROMPT Passphrase:",21)              = 21 (0x15)
write(8,"\n",1)                                  = 1 (0x1)
read(5,"OK\n",1002)                              = 3 (0x3)
write(8,"GETPIN",6)                              = 6 (0x6)
write(8,"\n",1)                                  = 1 (0x1)
read(5,0x802c24150,1002)                         = 0 (0x0)
write(8,"BYE",3)                                 ERR#32 'Broken pipe'
close(5)                                         = 0 (0x0)
close(8)                                         = 0 (0x0)

...