/* * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ #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, };