projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 5ba3f43e A |
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 | int | |
| 51 | cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp) | |
| 52 | { | |
| 53 | dev = cndev(); | |
| 54 | return ((*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp)); | |
| 55 | } | |
| 56 | ||
| 57 | ||
| 58 | int | |
| 59 | cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp) | |
| 60 | { | |
| 61 | dev = cndev(); | |
| 62 | return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, pp)); | |
| 63 | } | |
| 64 | ||
| 65 | ||
| 66 | int | |
| 67 | cnread(__unused dev_t dev, struct uio *uio, int ioflag) | |
| 68 | { | |
| 69 | dev = cndev(); | |
| 70 | return ((*cdevsw[major(dev)].d_read)(dev, uio, ioflag)); | |
| 71 | } | |
| 72 | ||
| 73 | ||
| 74 | int | |
| 75 | cnwrite(__unused dev_t dev, struct uio *uio, int ioflag) | |
| 76 | { | |
| 77 | dev = cndev(); | |
| 78 | return ((*cdevsw[major(dev)].d_write)(dev, uio, ioflag)); | |
| 79 | } | |
| 80 | ||
| 81 | ||
| 82 | int | |
| 83 | cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) | |
| 84 | { | |
| 85 | dev = cndev(); | |
| 86 | ||
| 87 | /* | |
| 88 | * XXX This check prevents the cons.c code from being shared between | |
| 89 | * XXX all architectures; it is probably not needed on ARM, either, | |
| 90 | * XXX but I have no test platforms or ability to run a kernel. | |
| 91 | * | |
| 92 | * Superuser can always use this to wrest control of console | |
| 93 | * output from the "virtual" console. | |
| 94 | */ | |
| 95 | if ((unsigned) cmd == TIOCCONS && constty) { | |
| 96 | int error = proc_suser(p); | |
| 97 | if (error) | |
| 98 | return (error); | |
| 99 | constty = NULL; | |
| 100 | return (0); | |
| 101 | } | |
| 102 | return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p)); | |
| 103 | } | |
| 104 | ||
| 105 | ||
| 106 | int | |
| 107 | cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p) | |
| 108 | { | |
| 109 | dev = cndev(); | |
| 110 | return ((*cdevsw[major(dev)].d_select)(dev, flag, wql, p)); | |
| 111 | } |