projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f406ae69 KB |
1 | /*- |
| 2 | * Copyright (c) 1982, 1986, 1991 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| da7c5cc6 | 6 | * |
| ea67b335 | 7 | * @(#)tty_tty.c 7.18 (Berkeley) %G% |
| da7c5cc6 | 8 | */ |
| 63c57592 BJ |
9 | |
| 10 | /* | |
| 964bcfb1 | 11 | * Indirect driver for controlling tty. |
| 63c57592 | 12 | */ |
| 94368568 JB |
13 | #include "param.h" |
| 14 | #include "systm.h" | |
| 15 | #include "conf.h" | |
| 94368568 | 16 | #include "ioctl.h" |
| 94368568 | 17 | #include "proc.h" |
| 063b2136 | 18 | #include "tty.h" |
| 232c0273 MT |
19 | #include "vnode.h" |
| 20 | #include "file.h" | |
| 63c57592 | 21 | |
| 232c0273 MT |
22 | #define cttyvp(p) ((p)->p_flag&SCTTY ? (p)->p_session->s_ttyvp : NULL) |
| 23 | ||
| 63c57592 | 24 | /*ARGSUSED*/ |
| 431fd894 | 25 | cttyopen(dev, flag, mode, p) |
| 830bbc16 | 26 | dev_t dev; |
| 431fd894 MK |
27 | int flag, mode; |
| 28 | struct proc *p; | |
| 63c57592 | 29 | { |
| 9342689a JH |
30 | USES_VOP_ACCESS; |
| 31 | USES_VOP_LOCK; | |
| 32 | USES_VOP_OPEN; | |
| 33 | USES_VOP_UNLOCK; | |
| 3789a403 | 34 | struct vnode *ttyvp = cttyvp(p); |
| 232c0273 | 35 | int error; |
| 63c57592 | 36 | |
| 232c0273 | 37 | if (ttyvp == NULL) |
| 830bbc16 | 38 | return (ENXIO); |
| 29e3ce7f KM |
39 | VOP_LOCK(ttyvp); |
| 40 | error = VOP_ACCESS(ttyvp, | |
| f254ddb7 | 41 | (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p); |
| f21184ce KM |
42 | if (!error) |
| 43 | error = VOP_OPEN(ttyvp, flag, NOCRED, p); | |
| 29e3ce7f | 44 | VOP_UNLOCK(ttyvp); |
| f21184ce | 45 | return (error); |
| 63c57592 BJ |
46 | } |
| 47 | ||
| 48 | /*ARGSUSED*/ | |
| 758b32dd | 49 | cttyread(dev, uio, flag) |
| be3a1208 BJ |
50 | dev_t dev; |
| 51 | struct uio *uio; | |
| 3e2a6ec5 | 52 | int flag; |
| 63c57592 | 53 | { |
| 9342689a JH |
54 | USES_VOP_LOCK; |
| 55 | USES_VOP_READ; | |
| 56 | USES_VOP_UNLOCK; | |
| 758b32dd | 57 | register struct vnode *ttyvp = cttyvp(uio->uio_procp); |
| 18b87772 | 58 | int error; |
| 63c57592 | 59 | |
| 232c0273 | 60 | if (ttyvp == NULL) |
| 431fd894 | 61 | return (EIO); |
| 18b87772 KM |
62 | VOP_LOCK(ttyvp); |
| 63 | error = VOP_READ(ttyvp, uio, flag, NOCRED); | |
| 64 | VOP_UNLOCK(ttyvp); | |
| 65 | return (error); | |
| 63c57592 BJ |
66 | } |
| 67 | ||
| 68 | /*ARGSUSED*/ | |
| 758b32dd | 69 | cttywrite(dev, uio, flag) |
| be3a1208 BJ |
70 | dev_t dev; |
| 71 | struct uio *uio; | |
| 3e2a6ec5 | 72 | int flag; |
| 63c57592 | 73 | { |
| 9342689a JH |
74 | USES_VOP_LOCK; |
| 75 | USES_VOP_UNLOCK; | |
| 76 | USES_VOP_WRITE; | |
| 758b32dd | 77 | register struct vnode *ttyvp = cttyvp(uio->uio_procp); |
| 18b87772 | 78 | int error; |
| 63c57592 | 79 | |
| 232c0273 | 80 | if (ttyvp == NULL) |
| 431fd894 | 81 | return (EIO); |
| 18b87772 KM |
82 | VOP_LOCK(ttyvp); |
| 83 | error = VOP_WRITE(ttyvp, uio, flag, NOCRED); | |
| 84 | VOP_UNLOCK(ttyvp); | |
| 85 | return (error); | |
| 63c57592 BJ |
86 | } |
| 87 | ||
| 88 | /*ARGSUSED*/ | |
| 431fd894 | 89 | cttyioctl(dev, cmd, addr, flag, p) |
| 35c1dcdb BJ |
90 | dev_t dev; |
| 91 | int cmd; | |
| 92 | caddr_t addr; | |
| 93 | int flag; | |
| 431fd894 | 94 | struct proc *p; |
| 63c57592 | 95 | { |
| 9342689a | 96 | USES_VOP_IOCTL; |
| 431fd894 | 97 | struct vnode *ttyvp = cttyvp(p); |
| 63c57592 | 98 | |
| 232c0273 | 99 | if (ttyvp == NULL) |
| 431fd894 | 100 | return (EIO); |
| 9060c89c | 101 | if (cmd == TIOCNOTTY) { |
| 431fd894 MK |
102 | if (!SESS_LEADER(p)) { |
| 103 | p->p_flag &= ~SCTTY; | |
| 232c0273 MT |
104 | return (0); |
| 105 | } else | |
| 106 | return (EINVAL); | |
| 4460d508 | 107 | } |
| f254ddb7 | 108 | return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p)); |
| 63c57592 | 109 | } |
| 231ed58b | 110 | |
| a8d3bf7f | 111 | /*ARGSUSED*/ |
| 431fd894 | 112 | cttyselect(dev, flag, p) |
| a8d3bf7f BJ |
113 | dev_t dev; |
| 114 | int flag; | |
| 431fd894 | 115 | struct proc *p; |
| 231ed58b | 116 | { |
| 9342689a | 117 | USES_VOP_SELECT; |
| 431fd894 | 118 | struct vnode *ttyvp = cttyvp(p); |
| 231ed58b | 119 | |
| 232c0273 | 120 | if (ttyvp == NULL) |
| 620eb66b | 121 | return (1); /* try operation to get EOF/failure */ |
| f254ddb7 | 122 | return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p)); |
| 231ed58b | 123 | } |