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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <fcntl.h> #include <string.h> #include <termios.h> #include <sys/stat.h> #include "chan_user.h" #include <os.h> #include <um_malloc.h> struct pty_chan { void (*announce)(char *dev_name, int dev); int dev; int raw; struct termios tt; char dev_name[sizeof("/dev/pts/0123456\0")]; }; static void *pty_chan_init(char *str, int device, const struct chan_opts *opts) { struct pty_chan *data; data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); if (data == NULL) return NULL; *data = ((struct pty_chan) { .announce = opts->announce, .dev = device, .raw = opts->raw }); return data; } static int pts_open(int input, int output, int primary, void *d, char **dev_out) { struct pty_chan *data = d; char *dev; int fd, err; fd = get_pty(); if (fd < 0) { err = -errno; printk(UM_KERN_ERR "open_pts : Failed to open pts\n"); return err; } if (data->raw) { CATCH_EINTR(err = tcgetattr(fd, &data->tt)); if (err) goto out_close; err = raw(fd); if (err) goto out_close; } dev = ptsname(fd); sprintf(data->dev_name, "%s", dev); *dev_out = data->dev_name; if (data->announce) (*data->announce)(dev, data->dev); return fd; out_close: close(fd); return err; } static int getmaster(char *line) { struct stat buf; char *pty, *bank, *cp; int master, err; pty = &line[strlen("/dev/ptyp")]; for (bank = "pqrs"; *bank; bank++) { line[strlen("/dev/pty")] = *bank; *pty = '0'; /* Did we hit the end ? */ if ((stat(line, &buf) < 0) && (errno == ENOENT)) break; for (cp = "0123456789abcdef"; *cp; cp++) { *pty = *cp; master = open(line, O_RDWR); if (master >= 0) { char *tp = &line[strlen("/dev/")]; /* verify slave side is usable */ *tp = 't'; err = access(line, R_OK | W_OK); *tp = 'p'; if (!err) return master; close(master); } } } printk(UM_KERN_ERR "getmaster - no usable host pty devices\n"); return -ENOENT; } static int pty_open(int input, int output, int primary, void *d, char **dev_out) { struct pty_chan *data = d; int fd, err; char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx"; fd = getmaster(dev); if (fd < 0) return fd; if (data->raw) { err = raw(fd); if (err) { close(fd); return err; } } if (data->announce) (*data->announce)(dev, data->dev); sprintf(data->dev_name, "%s", dev); *dev_out = data->dev_name; return fd; } const struct chan_ops pty_ops = { .type = "pty", .init = pty_chan_init, .open = pty_open, .close = generic_close, .read = generic_read, .write = generic_write, .console_write = generic_console_write, .window_size = generic_window_size, .free = generic_free, .winch = 0, }; const struct chan_ops pts_ops = { .type = "pts", .init = pty_chan_init, .open = pts_open, .close = generic_close, .read = generic_read, .write = generic_write, .console_write = generic_console_write, .window_size = generic_window_size, .free = generic_free, .winch = 0, }; |