| | 1 | /* |
| | 2 | * Copyright (c) 2000-2007 Apple Inc. All rights reserved. |
| | 3 | */ |
| | 4 | /* |
| | 5 | * Copyright (c) 1987, 1988 NeXT, Inc. |
| | 6 | * |
| | 7 | * HISTORY 7-Jan-93 Mac Gillon (mgillon) at NeXT Integrated POSIX support |
| | 8 | * |
| | 9 | * 12-Aug-87 John Seamons (jks) at NeXT Ported to NeXT. |
| | 10 | */ |
| | 11 | |
| | 12 | /* |
| | 13 | * Indirect driver for console. |
| | 14 | */ |
| | 15 | #include <sys/param.h> |
| | 16 | #include <sys/systm.h> |
| | 17 | #include <sys/conf.h> |
| | 18 | #include <sys/ioctl.h> |
| | 19 | #include <sys/tty.h> |
| | 20 | #include <sys/proc.h> |
| | 21 | #include <sys/uio.h> |
| | 22 | |
| | 23 | struct tty *constty; /* current console device */ |
| | 24 | |
| | 25 | /* |
| | 26 | * The km driver supplied the default console device for the systems |
| | 27 | * (usually a raw frame buffer driver, but potentially a serial driver). |
| | 28 | */ |
| | 29 | extern struct tty *km_tty[1]; |
| | 30 | |
| | 31 | /* |
| | 32 | * cdevsw[] entries for the console device driver |
| | 33 | */ |
| | 34 | int cnopen(__unused dev_t dev, int flag, int devtype, proc_t pp); |
| | 35 | int cnclose(__unused dev_t dev, int flag, int mode, proc_t pp); |
| | 36 | int cnread(__unused dev_t dev, struct uio *uio, int ioflag); |
| | 37 | int cnwrite(__unused dev_t dev, struct uio *uio, int ioflag); |
| | 38 | int cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flg, proc_t p); |
| | 39 | int cnselect(__unused dev_t dev, int flag, void * wql, proc_t p); |
| | 40 | |
| | 41 | static dev_t |
| | 42 | cndev(void) |
| | 43 | { |
| | 44 | if (constty) { |
| | 45 | return constty->t_dev; |
| | 46 | } else { |
| | 47 | return km_tty[0]->t_dev; |
| | 48 | } |
| | 49 | } |
| | 50 | |
| | 51 | int |
| | 52 | cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp) |
| | 53 | { |
| | 54 | dev = cndev(); |
| | 55 | return (*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp); |
| | 56 | } |
| | 57 | |
| | 58 | |
| | 59 | int |
| | 60 | cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp) |
| | 61 | { |
| | 62 | dev = cndev(); |
| | 63 | return (*cdevsw[major(dev)].d_close)(dev, flag, mode, pp); |
| | 64 | } |
| | 65 | |
| | 66 | |
| | 67 | int |
| | 68 | cnread(__unused dev_t dev, struct uio *uio, int ioflag) |
| | 69 | { |
| | 70 | dev = cndev(); |
| | 71 | return (*cdevsw[major(dev)].d_read)(dev, uio, ioflag); |
| | 72 | } |
| | 73 | |
| | 74 | |
| | 75 | int |
| | 76 | cnwrite(__unused dev_t dev, struct uio *uio, int ioflag) |
| | 77 | { |
| | 78 | dev = cndev(); |
| | 79 | return (*cdevsw[major(dev)].d_write)(dev, uio, ioflag); |
| | 80 | } |
| | 81 | |
| | 82 | |
| | 83 | int |
| | 84 | cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) |
| | 85 | { |
| | 86 | dev = cndev(); |
| | 87 | |
| | 88 | /* |
| | 89 | * XXX This check prevents the cons.c code from being shared between |
| | 90 | * XXX all architectures; it is probably not needed on ARM, either, |
| | 91 | * XXX but I have no test platforms or ability to run a kernel. |
| | 92 | * |
| | 93 | * Superuser can always use this to wrest control of console |
| | 94 | * output from the "virtual" console. |
| | 95 | */ |
| | 96 | if ((unsigned) cmd == TIOCCONS && constty) { |
| | 97 | int error = proc_suser(p); |
| | 98 | if (error) { |
| | 99 | return error; |
| | 100 | } |
| | 101 | constty = NULL; |
| | 102 | return 0; |
| | 103 | } |
| | 104 | return (*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p); |
| | 105 | } |
| | 106 | |
| | 107 | |
| | 108 | int |
| | 109 | cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p) |
| | 110 | { |
| | 111 | dev = cndev(); |
| | 112 | return (*cdevsw[major(dev)].d_select)(dev, flag, wql, p); |
| | 113 | } |
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