diff options
Diffstat (limited to 'arch/um/drivers/xterm.c')
| -rw-r--r-- | arch/um/drivers/xterm.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c new file mode 100644 index 000000000..20e30be44 --- /dev/null +++ b/arch/um/drivers/xterm.c @@ -0,0 +1,223 @@ +/* + * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + * Licensed under the GPL + */ + +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <termios.h> +#include "chan_user.h" +#include <os.h> +#include <um_malloc.h> +#include "xterm.h" + +struct xterm_chan { + int pid; + int helper_pid; + char *title; + int device; + int raw; + struct termios tt; +}; + +static void *xterm_init(char *str, int device, const struct chan_opts *opts) +{ + struct xterm_chan *data; + + data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); + if (data == NULL) + return NULL; + *data = ((struct xterm_chan) { .pid = -1, + .helper_pid = -1, + .device = device, + .title = opts->xterm_title, + .raw = opts->raw } ); + return data; +} + +/* Only changed by xterm_setup, which is a setup */ +static char *terminal_emulator = "xterm"; +static char *title_switch = "-T"; +static char *exec_switch = "-e"; + +static int __init xterm_setup(char *line, int *add) +{ + *add = 0; + terminal_emulator = line; + + line = strchr(line, ','); + if (line == NULL) + return 0; + + *line++ = '\0'; + if (*line) + title_switch = line; + + line = strchr(line, ','); + if (line == NULL) + return 0; + + *line++ = '\0'; + if (*line) + exec_switch = line; + + return 0; +} + +__uml_setup("xterm=", xterm_setup, +"xterm=<terminal emulator>,<title switch>,<exec switch>\n" +" Specifies an alternate terminal emulator to use for the debugger,\n" +" consoles, and serial lines when they are attached to the xterm channel.\n" +" The values are the terminal emulator binary, the switch it uses to set\n" +" its title, and the switch it uses to execute a subprocess,\n" +" respectively. The title switch must have the form '<switch> title',\n" +" not '<switch>=title'. Similarly, the exec switch must have the form\n" +" '<switch> command arg1 arg2 ...'.\n" +" The default values are 'xterm=xterm,-T,-e'. Values for gnome-terminal\n" +" are 'xterm=gnome-terminal,-t,-x'.\n\n" +); + +static int xterm_open(int input, int output, int primary, void *d, + char **dev_out) +{ + struct xterm_chan *data = d; + int pid, fd, new, err; + char title[256], file[] = "/tmp/xterm-pipeXXXXXX"; + char *argv[] = { terminal_emulator, title_switch, title, exec_switch, + OS_LIB_PATH "/uml/port-helper", "-uml-socket", + file, NULL }; + + if (access(argv[4], X_OK) < 0) + argv[4] = "port-helper"; + + /* + * Check that DISPLAY is set, this doesn't guarantee the xterm + * will work but w/o it we can be pretty sure it won't. + */ + if (getenv("DISPLAY") == NULL) { + printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n"); + return -ENODEV; + } + + /* + * This business of getting a descriptor to a temp file, + * deleting the file and closing the descriptor is just to get + * a known-unused name for the Unix socket that we really + * want. + */ + fd = mkstemp(file); + if (fd < 0) { + err = -errno; + printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n", + errno); + return err; + } + + if (unlink(file)) { + err = -errno; + printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n", + errno); + close(fd); + return err; + } + close(fd); + + fd = os_create_unix_socket(file, sizeof(file), 1); + if (fd < 0) { + printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, " + "errno = %d\n", -fd); + return fd; + } + + sprintf(title, data->title, data->device); + pid = run_helper(NULL, NULL, argv); + if (pid < 0) { + err = pid; + printk(UM_KERN_ERR "xterm_open : run_helper failed, " + "errno = %d\n", -err); + goto out_close1; + } + + err = os_set_fd_block(fd, 0); + if (err < 0) { + printk(UM_KERN_ERR "xterm_open : failed to set descriptor " + "non-blocking, err = %d\n", -err); + goto out_kill; + } + + new = xterm_fd(fd, &data->helper_pid); + if (new < 0) { + err = new; + printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n", + -err); + goto out_kill; + } + + err = os_set_fd_block(new, 0); + if (err) { + printk(UM_KERN_ERR "xterm_open : failed to set xterm " + "descriptor non-blocking, err = %d\n", -err); + goto out_close2; + } + + CATCH_EINTR(err = tcgetattr(new, &data->tt)); + if (err) { + new = err; + goto out_close2; + } + + if (data->raw) { + err = raw(new); + if (err) { + new = err; + goto out_close2; + } + } + + unlink(file); + data->pid = pid; + *dev_out = NULL; + + return new; + + out_close2: + close(new); + out_kill: + os_kill_process(pid, 1); + out_close1: + close(fd); + + return err; +} + +static void xterm_close(int fd, void *d) +{ + struct xterm_chan *data = d; + + if (data->pid != -1) + os_kill_process(data->pid, 1); + data->pid = -1; + + if (data->helper_pid != -1) + os_kill_process(data->helper_pid, 0); + data->helper_pid = -1; + + os_close_file(fd); +} + +const struct chan_ops xterm_ops = { + .type = "xterm", + .init = xterm_init, + .open = xterm_open, + .close = xterm_close, + .read = generic_read, + .write = generic_write, + .console_write = generic_console_write, + .window_size = generic_window_size, + .free = generic_free, + .winch = 1, +}; |