cons.c revision 1.3.10.2
1 1.3.10.2 tls /* $NetBSD: cons.c,v 1.3.10.2 2014/08/20 00:04:40 tls Exp $ */ 2 1.3.10.2 tls 3 1.3.10.2 tls /* 4 1.3.10.2 tls * Copyright (c) 2013 Antti Kantee. All Rights Reserved. 5 1.3.10.2 tls * 6 1.3.10.2 tls * Redistribution and use in source and binary forms, with or without 7 1.3.10.2 tls * modification, are permitted provided that the following conditions 8 1.3.10.2 tls * are met: 9 1.3.10.2 tls * 1. Redistributions of source code must retain the above copyright 10 1.3.10.2 tls * notice, this list of conditions and the following disclaimer. 11 1.3.10.2 tls * 2. Redistributions in binary form must reproduce the above copyright 12 1.3.10.2 tls * notice, this list of conditions and the following disclaimer in the 13 1.3.10.2 tls * documentation and/or other materials provided with the distribution. 14 1.3.10.2 tls * 15 1.3.10.2 tls * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 1.3.10.2 tls * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 1.3.10.2 tls * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 1.3.10.2 tls * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 1.3.10.2 tls * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 1.3.10.2 tls * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 1.3.10.2 tls * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 1.3.10.2 tls * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 1.3.10.2 tls * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 1.3.10.2 tls * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 1.3.10.2 tls * SUCH DAMAGE. 26 1.3.10.2 tls */ 27 1.3.10.2 tls 28 1.3.10.2 tls /* 29 1.3.10.2 tls * rumpcons, a (very) simple console-type device which relays output 30 1.3.10.2 tls * to the rumpuser_putchar() hypercall. This is most useful in 31 1.3.10.2 tls * environments where there is no Unix-like host (e.g. Xen DomU). 32 1.3.10.2 tls * It's currently a truly half duplex console since there is support 33 1.3.10.2 tls * only for writing to the console (there is no hypercall for reading 34 1.3.10.2 tls * the host console). The driver attempts to look like a tty just 35 1.3.10.2 tls * enough to fool isatty(). Let's see how far that gets us. 36 1.3.10.2 tls */ 37 1.3.10.2 tls 38 1.3.10.2 tls #include <sys/cdefs.h> 39 1.3.10.2 tls __KERNEL_RCSID(0, "$NetBSD: cons.c,v 1.3.10.2 2014/08/20 00:04:40 tls Exp $"); 40 1.3.10.2 tls 41 1.3.10.2 tls #include <sys/param.h> 42 1.3.10.2 tls #include <sys/file.h> 43 1.3.10.2 tls #include <sys/filedesc.h> 44 1.3.10.2 tls #include <sys/ioctl.h> 45 1.3.10.2 tls #include <sys/kernel.h> 46 1.3.10.2 tls #include <sys/kmem.h> 47 1.3.10.2 tls #include <sys/proc.h> 48 1.3.10.2 tls #include <sys/stat.h> 49 1.3.10.2 tls #include <sys/termios.h> 50 1.3.10.2 tls 51 1.3.10.2 tls #include <rump/rumpuser.h> 52 1.3.10.2 tls 53 1.3.10.2 tls #include "rump_private.h" 54 1.3.10.2 tls 55 1.3.10.2 tls static int rumpcons_write(struct file *, off_t *, struct uio *, 56 1.3.10.2 tls kauth_cred_t, int); 57 1.3.10.2 tls static int rumpcons_ioctl(struct file *, u_long, void *); 58 1.3.10.2 tls static int rumpcons_stat(struct file *, struct stat *); 59 1.3.10.2 tls 60 1.3.10.2 tls static const struct fileops rumpcons_fileops = { 61 1.3.10.2 tls .fo_read = (void *)nullop, 62 1.3.10.2 tls .fo_write = rumpcons_write, 63 1.3.10.2 tls .fo_ioctl = rumpcons_ioctl, 64 1.3.10.2 tls .fo_fcntl = fnullop_fcntl, 65 1.3.10.2 tls .fo_poll = fnullop_poll, 66 1.3.10.2 tls .fo_stat = rumpcons_stat, 67 1.3.10.2 tls .fo_close = (void *)nullop, 68 1.3.10.2 tls .fo_kqfilter = fnullop_kqfilter, 69 1.3.10.2 tls .fo_restart = fnullop_restart, 70 1.3.10.2 tls }; 71 1.3.10.2 tls 72 1.3.10.2 tls void 73 1.3.10.2 tls rump_consdev_init(void) 74 1.3.10.2 tls { 75 1.3.10.2 tls struct file *fp; 76 1.3.10.2 tls int fd, error; 77 1.3.10.2 tls 78 1.3.10.2 tls /* 79 1.3.10.2 tls * We want to open the descriptors for the implicit proc 80 1.3.10.2 tls * so that they get inherited by default to all processes. 81 1.3.10.2 tls */ 82 1.3.10.2 tls KASSERT(curproc->p_pid == 1); 83 1.3.10.2 tls KASSERT(fd_getfile(0) == NULL); 84 1.3.10.2 tls 85 1.3.10.2 tls /* then, map a file descriptor to the device */ 86 1.3.10.2 tls if ((error = fd_allocfile(&fp, &fd)) != 0) 87 1.3.10.2 tls panic("cons fd_allocfile failed: %d", error); 88 1.3.10.2 tls 89 1.3.10.2 tls fp->f_flag = FWRITE; 90 1.3.10.2 tls fp->f_type = DTYPE_MISC; 91 1.3.10.2 tls fp->f_ops = &rumpcons_fileops; 92 1.3.10.2 tls fp->f_data = NULL; 93 1.3.10.2 tls fd_affix(curproc, fp, fd); 94 1.3.10.2 tls 95 1.3.10.2 tls KASSERT(fd == 0); 96 1.3.10.2 tls error += fd_dup2(fp, 1, 0); 97 1.3.10.2 tls error += fd_dup2(fp, 2, 0); 98 1.3.10.2 tls 99 1.3.10.2 tls if (error) 100 1.3.10.2 tls panic("failed to dup fd 0/1/2"); 101 1.3.10.2 tls } 102 1.3.10.2 tls 103 1.3.10.2 tls static int 104 1.3.10.2 tls rumpcons_write(struct file *fp, off_t *off, struct uio *uio, 105 1.3.10.2 tls kauth_cred_t cred, int flags) 106 1.3.10.2 tls { 107 1.3.10.2 tls char *buf; 108 1.3.10.2 tls size_t len, n; 109 1.3.10.2 tls int error = 0; 110 1.3.10.2 tls 111 1.3.10.2 tls buf = kmem_alloc(PAGE_SIZE, KM_SLEEP); 112 1.3.10.2 tls while (uio->uio_resid > 0) { 113 1.3.10.2 tls len = min(PAGE_SIZE, uio->uio_resid); 114 1.3.10.2 tls error = uiomove(buf, len, uio); 115 1.3.10.2 tls if (error) 116 1.3.10.2 tls break; 117 1.3.10.2 tls 118 1.3.10.2 tls for (n = 0; n < len; n++) { 119 1.3.10.2 tls rumpuser_putchar(*(buf+n)); 120 1.3.10.2 tls } 121 1.3.10.2 tls } 122 1.3.10.2 tls kmem_free(buf, PAGE_SIZE); 123 1.3.10.2 tls 124 1.3.10.2 tls return error; 125 1.3.10.2 tls } 126 1.3.10.2 tls 127 1.3.10.2 tls static int 128 1.3.10.2 tls rumpcons_ioctl(struct file *fp, u_long cmd, void *data) 129 1.3.10.2 tls { 130 1.3.10.2 tls 131 1.3.10.2 tls if (cmd == TIOCGETA) 132 1.3.10.2 tls return 0; 133 1.3.10.2 tls 134 1.3.10.2 tls return ENOTTY; /* considering how we are cheating, lol */ 135 1.3.10.2 tls } 136 1.3.10.2 tls 137 1.3.10.2 tls static int 138 1.3.10.2 tls rumpcons_stat(struct file *fp, struct stat *sb) 139 1.3.10.2 tls { 140 1.3.10.2 tls 141 1.3.10.2 tls memset(sb, 0, sizeof(*sb)); 142 1.3.10.2 tls sb->st_mode = 0600 | _S_IFCHR; 143 1.3.10.2 tls sb->st_atimespec = sb->st_mtimespec = sb->st_ctimespec = boottime; 144 1.3.10.2 tls sb->st_birthtimespec = boottime; 145 1.3.10.2 tls 146 1.3.10.2 tls return 0; 147 1.3.10.2 tls } 148
Indexes created Thu Oct 02 14:10:14 GMT 2025