8	dev_zero_control	devzero.c:84
36	dev_zero_read	devzero.c:64
16	dev_zero_write	devzero.c:71
8	null_close	devnull.c:91
8	null_control	unknown:-1
8	null_initialize	devnull.c:69
12	null_initialize	devnull.c:63
8	null_open	devnull.c:63
8	null_read	devnull.c:91
28	null_write	devnull.c:158