1 /* $NetBSD: tty_bsdpty.c,v 1.1 2004/11/10 17:29:54 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: tty_bsdpty.c,v 1.1 2004/11/10 17:29:54 christos Exp $"); 38 39 #include "opt_ptm.h" 40 41 #ifdef COMPAT_BSDPTY 42 /* bsd tty implementation for pty multiplexor driver /dev/ptm{,x} */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/ioctl.h> 47 #include <sys/proc.h> 48 #include <sys/tty.h> 49 #include <sys/stat.h> 50 #include <sys/file.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 #include <sys/namei.h> 55 #include <sys/signalvar.h> 56 #include <sys/uio.h> 57 #include <sys/filedesc.h> 58 #include <sys/conf.h> 59 #include <sys/poll.h> 60 #include <sys/malloc.h> 61 #include <sys/pty.h> 62 63 /* 64 * pts == /dev/tty[pqrs]? 65 * ptc == /dev/pty[pqrs]? 66 */ 67 68 #define TTY_TEMPLATE "/dev/XtyXX" 69 #define TTY_NAMESIZE sizeof(TTY_TEMPLATE) 70 /* XXX this needs to come from somewhere sane, and work with MAKEDEV */ 71 #define TTY_LETTERS "pqrstuvwxyzPQRST" 72 #define TTY_OLD_SUFFIX "0123456789abcdef" 73 #define TTY_NEW_SUFFIX "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" 74 75 static int pty_makename(struct ptm_pty *, char *, size_t, dev_t, char); 76 static int pty_allocvp(struct ptm_pty *, struct proc *, struct vnode **, 77 dev_t, char); 78 79 struct ptm_pty ptm_bsdpty = { 80 pty_allocvp, 81 pty_makename, 82 NULL 83 }; 84 85 static int 86 /*ARGSUSED*/ 87 pty_makename(struct ptm_pty *ptm, char *buf, size_t bufsiz, dev_t dev, char c) 88 { 89 size_t nt; 90 dev_t minor = minor(dev); 91 if (bufsiz < TTY_NAMESIZE) 92 return EINVAL; 93 (void)memcpy(buf, TTY_TEMPLATE, TTY_NAMESIZE); 94 95 buf[5] = c; 96 97 if (minor < 256) { 98 nt = sizeof(TTY_OLD_SUFFIX) - 1; 99 buf[8] = TTY_LETTERS[minor / nt]; 100 buf[9] = TTY_OLD_SUFFIX[minor % nt]; 101 } else { 102 minor -= 256; 103 nt = sizeof(TTY_NEW_SUFFIX) - sizeof(TTY_OLD_SUFFIX); 104 buf[8] = TTY_LETTERS[minor / nt]; 105 buf[9] = TTY_NEW_SUFFIX[minor % nt]; 106 } 107 return 0; 108 } 109 110 111 static int 112 /*ARGSUSED*/ 113 pty_allocvp(struct ptm_pty *ptm, struct proc *p, struct vnode **vp, dev_t dev, 114 char ms) 115 { 116 int error; 117 struct nameidata nd; 118 char name[TTY_NAMESIZE]; 119 120 error = (*ptm->makename)(ptm, name, sizeof(name), dev, ms); 121 if (error) 122 return error; 123 124 NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, name, p); 125 if ((error = namei(&nd)) != 0) 126 return error; 127 *vp = nd.ni_vp; 128 return 0; 129 } 130 #endif 131