mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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37185b3324
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
224 lines
4.9 KiB
C
224 lines
4.9 KiB
C
/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <termios.h>
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#include "chan_user.h"
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#include <os.h>
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#include <um_malloc.h>
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#include "xterm.h"
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struct xterm_chan {
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int pid;
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int helper_pid;
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char *title;
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int device;
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int raw;
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struct termios tt;
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};
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static void *xterm_init(char *str, int device, const struct chan_opts *opts)
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{
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struct xterm_chan *data;
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data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
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if (data == NULL)
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return NULL;
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*data = ((struct xterm_chan) { .pid = -1,
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.helper_pid = -1,
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.device = device,
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.title = opts->xterm_title,
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.raw = opts->raw } );
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return data;
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}
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/* Only changed by xterm_setup, which is a setup */
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static char *terminal_emulator = "xterm";
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static char *title_switch = "-T";
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static char *exec_switch = "-e";
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static int __init xterm_setup(char *line, int *add)
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{
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*add = 0;
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terminal_emulator = line;
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line = strchr(line, ',');
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if (line == NULL)
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return 0;
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*line++ = '\0';
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if (*line)
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title_switch = line;
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line = strchr(line, ',');
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if (line == NULL)
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return 0;
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*line++ = '\0';
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if (*line)
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exec_switch = line;
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return 0;
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}
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__uml_setup("xterm=", xterm_setup,
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"xterm=<terminal emulator>,<title switch>,<exec switch>\n"
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" Specifies an alternate terminal emulator to use for the debugger,\n"
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" consoles, and serial lines when they are attached to the xterm channel.\n"
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" The values are the terminal emulator binary, the switch it uses to set\n"
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" its title, and the switch it uses to execute a subprocess,\n"
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" respectively. The title switch must have the form '<switch> title',\n"
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" not '<switch>=title'. Similarly, the exec switch must have the form\n"
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" '<switch> command arg1 arg2 ...'.\n"
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" The default values are 'xterm=xterm,-T,-e'. Values for gnome-terminal\n"
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" are 'xterm=gnome-terminal,-t,-x'.\n\n"
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);
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static int xterm_open(int input, int output, int primary, void *d,
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char **dev_out)
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{
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struct xterm_chan *data = d;
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int pid, fd, new, err;
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char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
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char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
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OS_LIB_PATH "/uml/port-helper", "-uml-socket",
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file, NULL };
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if (access(argv[4], X_OK) < 0)
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argv[4] = "port-helper";
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/*
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* Check that DISPLAY is set, this doesn't guarantee the xterm
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* will work but w/o it we can be pretty sure it won't.
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*/
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if (getenv("DISPLAY") == NULL) {
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printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
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return -ENODEV;
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}
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/*
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* This business of getting a descriptor to a temp file,
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* deleting the file and closing the descriptor is just to get
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* a known-unused name for the Unix socket that we really
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* want.
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*/
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fd = mkstemp(file);
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if (fd < 0) {
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err = -errno;
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printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
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errno);
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return err;
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}
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if (unlink(file)) {
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err = -errno;
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printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
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errno);
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close(fd);
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return err;
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}
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close(fd);
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fd = os_create_unix_socket(file, sizeof(file), 1);
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if (fd < 0) {
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printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
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"errno = %d\n", -fd);
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return fd;
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}
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sprintf(title, data->title, data->device);
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pid = run_helper(NULL, NULL, argv);
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if (pid < 0) {
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err = pid;
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printk(UM_KERN_ERR "xterm_open : run_helper failed, "
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"errno = %d\n", -err);
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goto out_close1;
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}
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err = os_set_fd_block(fd, 0);
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if (err < 0) {
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printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
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"non-blocking, err = %d\n", -err);
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goto out_kill;
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}
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new = xterm_fd(fd, &data->helper_pid);
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if (new < 0) {
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err = new;
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printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
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-err);
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goto out_kill;
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}
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err = os_set_fd_block(new, 0);
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if (err) {
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printk(UM_KERN_ERR "xterm_open : failed to set xterm "
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"descriptor non-blocking, err = %d\n", -err);
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goto out_close2;
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}
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CATCH_EINTR(err = tcgetattr(new, &data->tt));
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if (err) {
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new = err;
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goto out_close2;
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}
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if (data->raw) {
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err = raw(new);
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if (err) {
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new = err;
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goto out_close2;
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}
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}
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unlink(file);
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data->pid = pid;
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*dev_out = NULL;
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return new;
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out_close2:
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close(new);
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out_kill:
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os_kill_process(pid, 1);
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out_close1:
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close(fd);
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return err;
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}
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static void xterm_close(int fd, void *d)
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{
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struct xterm_chan *data = d;
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if (data->pid != -1)
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os_kill_process(data->pid, 1);
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data->pid = -1;
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if (data->helper_pid != -1)
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os_kill_process(data->helper_pid, 0);
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data->helper_pid = -1;
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os_close_file(fd);
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}
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const struct chan_ops xterm_ops = {
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.type = "xterm",
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.init = xterm_init,
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.open = xterm_open,
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.close = xterm_close,
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.read = generic_read,
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.write = generic_write,
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.console_write = generic_console_write,
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.window_size = generic_window_size,
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.free = generic_free,
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.winch = 1,
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};
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