/* * Copyright (C) 2001 Jeff Dike (jdike@karaya.com) * Licensed under the GPL */ #include <stdio.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <fcntl.h> #include <termios.h> #include "chan_user.h" #include "user.h" #include "user_util.h" #include "kern_util.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")]; }; void *pty_chan_init(char *str, int device, struct chan_opts *opts) { struct pty_chan *data; if((data = um_kmalloc(sizeof(*data))) == NULL) return(NULL); *data = ((struct pty_chan) { announce : opts->announce, dev : device, raw : opts->raw }); return(data); } int pts_open(int input, int output, int primary, void *d, char **dev_out) { struct pty_chan *data = d; char *dev; int fd; if((fd = get_pty()) < 0){ printk("open_pts : Failed to open pts\n"); return(-errno); } if(data->raw){ tcgetattr(fd, &data->tt); raw(fd, 0); } dev = ptsname(fd); sprintf(data->dev_name, "%s", dev); *dev_out = data->dev_name; if(data->announce) (*data->announce)(dev, data->dev); return(fd); } int getmaster(char *line) { struct stat stb; char *pty, *bank, *cp; int master; pty = &line[strlen("/dev/ptyp")]; for (bank = "pqrs"; *bank; bank++) { line[strlen("/dev/pty")] = *bank; *pty = '0'; if (stat(line, &stb) < 0) break; for (cp = "0123456789abcdef"; *cp; cp++) { *pty = *cp; master = open(line, O_RDWR); if (master >= 0) { char *tp = &line[strlen("/dev/")]; int ok; /* verify slave side is usable */ *tp = 't'; ok = access(line, R_OK|W_OK) == 0; *tp = 'p'; if (ok) return(master); (void) close(master); } } } return(-1); } struct grantpt_info { int fd; int res; int err; }; static void grantpt_cb(void *arg) { struct grantpt_info *info = arg; info->res = grantpt(info->fd); info->err = errno; } int pty_open(int input, int output, int primary, void *d, char **dev_out) { struct pty_chan *data = d; int fd; char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx"; struct grantpt_info info; fd = getmaster(dev); if(fd < 0) return(-errno); info.fd = fd; tracing_cb(grantpt_cb, &info); unlockpt(fd); if(data->raw) raw(fd, 0); if(data->announce) (*data->announce)(dev, data->dev); sprintf(data->dev_name, "%s", dev); *dev_out = data->dev_name; return(fd); } int pty_console_write(int fd, const char *buf, int n, void *d) { struct pty_chan *data = d; return(generic_console_write(fd, buf, n, &data->tt)); } 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: pty_console_write, window_size: generic_window_size, free: generic_free, winch: 0, }; 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: pty_console_write, window_size: generic_window_size, free: generic_free, winch: 0, }; /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-file-style: "linux" * End: */