/
emacsclient.c
1812 lines (1523 loc) · 42.4 KB
/
emacsclient.c
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/* Client process that communicates with GNU Emacs acting as server.
Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004,
2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef WINDOWSNT
/* config.h defines these, which disables sockets altogether! */
# undef _WINSOCKAPI_
# undef _WINSOCK_H
# include <malloc.h>
# include <stdlib.h>
# include <windows.h>
# include <commctrl.h>
# define NO_SOCKETS_IN_FILE_SYSTEM
# define HSOCKET SOCKET
# define CLOSE_SOCKET closesocket
# define INITIALIZE() (initialize_sockets ())
#else /* !WINDOWSNT */
# include "syswait.h"
# ifdef HAVE_INET_SOCKETS
# include <netinet/in.h>
# endif
# include <arpa/inet.h>
# define INVALID_SOCKET -1
# define HSOCKET int
# define CLOSE_SOCKET close
# define INITIALIZE()
# ifndef WCONTINUED
# define WCONTINUED 8
# endif
#endif /* !WINDOWSNT */
#undef signal
#include <stdarg.h>
#include <ctype.h>
#include <stdio.h>
#include "getopt.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef WINDOWSNT
# include <io.h>
#else /* not WINDOWSNT */
# include <pwd.h>
#endif /* not WINDOWSNT */
#include <sys/stat.h>
#include <signal.h>
#include <errno.h>
char *getenv (), *getwd ();
char *(getcwd) ();
#ifdef WINDOWSNT
char *w32_getenv ();
#define egetenv(VAR) w32_getenv(VAR)
#else
#define egetenv(VAR) getenv(VAR)
#endif
#ifndef VERSION
#define VERSION "unspecified"
#endif
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#ifndef NO_RETURN
#define NO_RETURN
#endif
/* Additional space when allocating buffers for filenames, etc. */
#define EXTRA_SPACE 100
/* Name used to invoke this program. */
char *progname;
/* The second argument to main. */
char **main_argv;
/* Nonzero means don't wait for a response from Emacs. --no-wait. */
int nowait = 0;
/* Nonzero means args are expressions to be evaluated. --eval. */
int eval = 0;
/* Nonzero means don't open a new frame. Inverse of --create-frame. */
int current_frame = 1;
/* The display on which Emacs should work. --display. */
char *display = NULL;
/* Nonzero means open a new Emacs frame on the current terminal. */
int tty = 0;
/* If non-NULL, the name of an editor to fallback to if the server
is not running. --alternate-editor. */
const char *alternate_editor = NULL;
/* If non-NULL, the filename of the UNIX socket. */
char *socket_name = NULL;
/* If non-NULL, the filename of the authentication file. */
char *server_file = NULL;
/* PID of the Emacs server process. */
int emacs_pid = 0;
void print_help_and_exit () NO_RETURN;
struct option longopts[] =
{
{ "no-wait", no_argument, NULL, 'n' },
{ "eval", no_argument, NULL, 'e' },
{ "help", no_argument, NULL, 'H' },
{ "version", no_argument, NULL, 'V' },
{ "tty", no_argument, NULL, 't' },
{ "nw", no_argument, NULL, 't' },
{ "create-frame", no_argument, NULL, 'c' },
{ "alternate-editor", required_argument, NULL, 'a' },
#ifndef NO_SOCKETS_IN_FILE_SYSTEM
{ "socket-name", required_argument, NULL, 's' },
#endif
{ "server-file", required_argument, NULL, 'f' },
#ifndef WINDOWSNT
{ "display", required_argument, NULL, 'd' },
#endif
{ 0, 0, 0, 0 }
};
/* Like malloc but get fatal error if memory is exhausted. */
long *
xmalloc (size)
unsigned int size;
{
long *result = (long *) malloc (size);
if (result == NULL)
{
perror ("malloc");
exit (EXIT_FAILURE);
}
return result;
}
/* Like strdup but get a fatal error if memory is exhausted. */
char *
xstrdup (const char *s)
{
char *result = strdup (s);
if (result == NULL)
{
perror ("strdup");
exit (EXIT_FAILURE);
}
return result;
}
/* From sysdep.c */
#if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
/* From lisp.h */
#ifndef DIRECTORY_SEP
#define DIRECTORY_SEP '/'
#endif
#ifndef IS_DIRECTORY_SEP
#define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP)
#endif
#ifndef IS_DEVICE_SEP
#ifndef DEVICE_SEP
#define IS_DEVICE_SEP(_c_) 0
#else
#define IS_DEVICE_SEP(_c_) ((_c_) == DEVICE_SEP)
#endif
#endif
#ifndef IS_ANY_SEP
#define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_))
#endif
/* Return the current working directory. Returns NULL on errors.
Any other returned value must be freed with free. This is used
only when get_current_dir_name is not defined on the system. */
char*
get_current_dir_name ()
{
char *buf;
char *pwd;
struct stat dotstat, pwdstat;
/* If PWD is accurate, use it instead of calling getwd. PWD is
sometimes a nicer name, and using it may avoid a fatal error if a
parent directory is searchable but not readable. */
if ((pwd = egetenv ("PWD")) != 0
&& (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
&& stat (pwd, &pwdstat) == 0
&& stat (".", &dotstat) == 0
&& dotstat.st_ino == pwdstat.st_ino
&& dotstat.st_dev == pwdstat.st_dev
#ifdef MAXPATHLEN
&& strlen (pwd) < MAXPATHLEN
#endif
)
{
buf = (char *) xmalloc (strlen (pwd) + 1);
if (!buf)
return NULL;
strcpy (buf, pwd);
}
#ifdef HAVE_GETCWD
else
{
size_t buf_size = 1024;
buf = (char *) xmalloc (buf_size);
if (!buf)
return NULL;
for (;;)
{
if (getcwd (buf, buf_size) == buf)
break;
if (errno != ERANGE)
{
int tmp_errno = errno;
free (buf);
errno = tmp_errno;
return NULL;
}
buf_size *= 2;
buf = (char *) realloc (buf, buf_size);
if (!buf)
return NULL;
}
}
#else
else
{
/* We need MAXPATHLEN here. */
buf = (char *) xmalloc (MAXPATHLEN + 1);
if (!buf)
return NULL;
if (getwd (buf) == NULL)
{
int tmp_errno = errno;
free (buf);
errno = tmp_errno;
return NULL;
}
}
#endif
return buf;
}
#endif
#ifdef WINDOWSNT
#define REG_ROOT "SOFTWARE\\GNU\\Emacs"
/* Retrieve an environment variable from the Emacs subkeys of the registry.
Return NULL if the variable was not found, or it was empty.
This code is based on w32_get_resource (w32.c). */
char *
w32_get_resource (predefined, key, type)
HKEY predefined;
char *key;
LPDWORD type;
{
HKEY hrootkey = NULL;
char *result = NULL;
DWORD cbData;
if (RegOpenKeyEx (predefined, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
{
if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS)
{
result = (char *) xmalloc (cbData);
if ((RegQueryValueEx (hrootkey, key, NULL, type, result, &cbData) != ERROR_SUCCESS)
|| (*result == 0))
{
free (result);
result = NULL;
}
}
RegCloseKey (hrootkey);
}
return result;
}
/*
getenv wrapper for Windows
This is needed to duplicate Emacs's behavior, which is to look for enviroment
variables in the registry if they don't appear in the environment.
*/
char *
w32_getenv (envvar)
char *envvar;
{
char *value;
DWORD dwType;
if (value = getenv (envvar))
/* Found in the environment. */
return value;
if (! (value = w32_get_resource (HKEY_CURRENT_USER, envvar, &dwType)) &&
! (value = w32_get_resource (HKEY_LOCAL_MACHINE, envvar, &dwType)))
{
/* "w32console" is what Emacs on Windows uses for tty-type under -nw. */
if (strcmp (envvar, "TERM") == 0)
return xstrdup ("w32console");
/* Found neither in the environment nor in the registry. */
return NULL;
}
if (dwType == REG_SZ)
/* Registry; no need to expand. */
return value;
if (dwType == REG_EXPAND_SZ)
{
DWORD size;
if (size = ExpandEnvironmentStrings (value, NULL, 0))
{
char *buffer = (char *) xmalloc (size);
if (ExpandEnvironmentStrings (value, buffer, size))
{
/* Found and expanded. */
free (value);
return buffer;
}
/* Error expanding. */
free (buffer);
}
}
/* Not the right type, or not correctly expanded. */
free (value);
return NULL;
}
void
w32_set_user_model_id ()
{
HMODULE shell;
HRESULT (WINAPI * set_user_model) (wchar_t * id);
/* On Windows 7 and later, we need to set the user model ID
to associate emacsclient launched files with Emacs frames
in the UI. */
shell = LoadLibrary("shell32.dll");
if (shell)
{
set_user_model
= (void *) GetProcAddress (shell,
"SetCurrentProcessExplicitAppUserModelID");
/* If the function is defined, then we are running on Windows 7
or newer, and the UI uses this to group related windows
together. Since emacs, runemacs, emacsclient are related, we
want them grouped even though the executables are different,
so we need to set a consistent ID between them. */
if (set_user_model)
set_user_model (L"GNU.Emacs");
FreeLibrary (shell);
}
}
int
w32_window_app ()
{
static int window_app = -1;
char szTitle[MAX_PATH];
if (window_app < 0)
{
/* Checking for STDOUT does not work; it's a valid handle also in
nonconsole apps. Testing for the console title seems to work. */
window_app = (GetConsoleTitleA (szTitle, MAX_PATH) == 0);
if (window_app)
InitCommonControls();
}
return window_app;
}
/*
execvp wrapper for Windows. Quotes arguments with embedded spaces.
This is necessary due to the broken implementation of exec* routines in
the Microsoft libraries: they concatenate the arguments together without
quoting special characters, and pass the result to CreateProcess, with
predictably bad results. By contrast, Posix execvp passes the arguments
directly into the argv array of the child process.
*/
int
w32_execvp (path, argv)
char *path;
char **argv;
{
int i;
/* Required to allow a .BAT script as alternate editor. */
argv[0] = (char *) alternate_editor;
for (i = 0; argv[i]; i++)
if (strchr (argv[i], ' '))
{
char *quoted = alloca (strlen (argv[i]) + 3);
sprintf (quoted, "\"%s\"", argv[i]);
argv[i] = quoted;
}
return execvp (path, argv);
}
#undef execvp
#define execvp w32_execvp
/* Emulation of ttyname for Windows. */
char *
ttyname (int fd)
{
return "CONOUT$";
}
#endif /* WINDOWSNT */
/* Display a normal or error message.
On Windows, use a message box if compiled as a Windows app. */
void
message (int is_error, char *message, ...)
{
char msg [2048];
va_list args;
va_start (args, message);
vsprintf (msg, message, args);
va_end (args);
#ifdef WINDOWSNT
if (w32_window_app ())
{
if (is_error)
MessageBox (NULL, msg, "Emacsclient ERROR", MB_ICONERROR);
else
MessageBox (NULL, msg, "Emacsclient", MB_ICONINFORMATION);
}
else
#endif
{
FILE *f = is_error ? stderr : stdout;
fputs (msg, f);
fflush (f);
}
}
/* Decode the options from argv and argc.
The global variable `optind' will say how many arguments we used up. */
void
decode_options (argc, argv)
int argc;
char **argv;
{
alternate_editor = egetenv ("ALTERNATE_EDITOR");
while (1)
{
int opt = getopt_long_only (argc, argv,
#ifndef NO_SOCKETS_IN_FILE_SYSTEM
"VHnea:s:f:d:tc",
#else
"VHnea:f:d:tc",
#endif
longopts, 0);
if (opt == EOF)
break;
switch (opt)
{
case 0:
/* If getopt returns 0, then it has already processed a
long-named option. We should do nothing. */
break;
case 'a':
alternate_editor = optarg;
break;
#ifndef NO_SOCKETS_IN_FILE_SYSTEM
case 's':
socket_name = optarg;
break;
#endif
case 'f':
server_file = optarg;
break;
/* We used to disallow this argument in w32, but it seems better
to allow it, for the occasional case where the user is
connecting with a w32 client to a server compiled with X11
support. */
case 'd':
display = optarg;
break;
case 'n':
nowait = 1;
break;
case 'e':
eval = 1;
break;
case 'V':
message (FALSE, "emacsclient %s\n", VERSION);
exit (EXIT_SUCCESS);
break;
case 't':
tty = 1;
current_frame = 0;
break;
case 'c':
current_frame = 0;
break;
case 'H':
print_help_and_exit ();
break;
default:
message (TRUE, "Try `%s --help' for more information\n", progname);
exit (EXIT_FAILURE);
break;
}
}
/* If the -c option is used (without -t) and no --display argument
is provided, try $DISPLAY.
Without the -c option, we used to set `display' to $DISPLAY by
default, but this changed the default behavior and is sometimes
inconvenient. So we force users to use "--display $DISPLAY" if
they want Emacs to connect to their current display. */
if (!current_frame && !tty && !display)
{
display = egetenv ("DISPLAY");
#ifdef NS_IMPL_COCOA
/* Under Cocoa, we don't really use displays the same way as in X,
so provide a dummy. */
if (!display || strlen (display) == 0)
display = "ns";
#endif
}
/* A null-string display is invalid. */
if (display && strlen (display) == 0)
display = NULL;
/* If no display is available, new frames are tty frames. */
if (!current_frame && !display)
tty = 1;
/* --no-wait implies --current-frame on ttys when there are file
arguments or expressions given. */
if (nowait && tty && argc - optind > 0)
current_frame = 1;
#ifdef WINDOWSNT
if (alternate_editor && alternate_editor[0] == '\0')
{
message (TRUE, "--alternate-editor argument or ALTERNATE_EDITOR variable cannot be\n\
an empty string");
exit (EXIT_FAILURE);
}
#endif /* WINDOWSNT */
}
void
print_help_and_exit ()
{
/* Spaces and tabs are significant in this message; they're chosen so the
message aligns properly both in a tty and in a Windows message box.
Please try to preserve them; otherwise the output is very hard to read
when using emacsclientw. */
message (FALSE,
"Usage: %s [OPTIONS] FILE...\n\
Tell the Emacs server to visit the specified files.\n\
Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
\n\
The following OPTIONS are accepted:\n\
-V, --version Just print version info and return\n\
-H, --help Print this usage information message\n\
-nw, -t, --tty Open a new Emacs frame on the current terminal\n\
-c, --create-frame Create a new frame instead of trying to\n\
use the current Emacs frame\n\
-e, --eval Evaluate the FILE arguments as ELisp expressions\n\
-n, --no-wait Don't wait for the server to return\n\
-d DISPLAY, --display=DISPLAY\n\
Visit the file in the given display\n"
#ifndef NO_SOCKETS_IN_FILE_SYSTEM
"-s SOCKET, --socket-name=SOCKET\n\
Set filename of the UNIX socket for communication\n"
#endif
"-f SERVER, --server-file=SERVER\n\
Set filename of the TCP authentication file\n\
-a EDITOR, --alternate-editor=EDITOR\n\
Editor to fallback to if the server is not running\n"
#ifndef WINDOWSNT
" If EDITOR is the empty string, start Emacs in daemon\n\
mode and try connecting again\n"
#endif /* not WINDOWSNT */
"\n\
Report bugs with M-x report-emacs-bug.\n", progname);
exit (EXIT_SUCCESS);
}
/*
Try to run a different command, or --if no alternate editor is
defined-- exit with an errorcode.
Uses argv, but gets it from the global variable main_argv.
*/
void
fail (void)
{
if (alternate_editor)
{
int i = optind - 1;
execvp (alternate_editor, main_argv + i);
message (TRUE, "%s: error executing alternate editor \"%s\"\n",
progname, alternate_editor);
}
exit (EXIT_FAILURE);
}
#if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS)
int
main (argc, argv)
int argc;
char **argv;
{
main_argv = argv;
progname = argv[0];
message (TRUE, "%s: Sorry, the Emacs server is supported only\n"
"on systems with Berkeley sockets.\n",
argv[0]);
fail ();
}
#else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
#ifdef WINDOWSNT
# include <winsock2.h>
#else
# include <sys/types.h>
# include <sys/socket.h>
# include <sys/un.h>
#endif
#define AUTH_KEY_LENGTH 64
#define SEND_BUFFER_SIZE 4096
extern char *strerror ();
extern int errno;
/* Buffer to accumulate data to send in TCP connections. */
char send_buffer[SEND_BUFFER_SIZE + 1];
int sblen = 0; /* Fill pointer for the send buffer. */
/* Socket used to communicate with the Emacs server process. */
HSOCKET emacs_socket = 0;
/* On Windows, the socket library was historically separate from the standard
C library, so errors are handled differently. */
void
sock_err_message (function_name)
char *function_name;
{
#ifdef WINDOWSNT
char* msg = NULL;
FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_ARGUMENT_ARRAY,
NULL, WSAGetLastError (), 0, (LPTSTR)&msg, 0, NULL);
message (TRUE, "%s: %s: %s\n", progname, function_name, msg);
LocalFree (msg);
#else
message (TRUE, "%s: %s: %s\n", progname, function_name, strerror (errno));
#endif
}
/* Let's send the data to Emacs when either
- the data ends in "\n", or
- the buffer is full (but this shouldn't happen)
Otherwise, we just accumulate it. */
void
send_to_emacs (s, data)
HSOCKET s;
char *data;
{
while (data)
{
int dlen = strlen (data);
if (dlen + sblen >= SEND_BUFFER_SIZE)
{
int part = SEND_BUFFER_SIZE - sblen;
strncpy (&send_buffer[sblen], data, part);
data += part;
sblen = SEND_BUFFER_SIZE;
}
else if (dlen)
{
strcpy (&send_buffer[sblen], data);
data = NULL;
sblen += dlen;
}
else
break;
if (sblen == SEND_BUFFER_SIZE
|| (sblen > 0 && send_buffer[sblen-1] == '\n'))
{
int sent = send (s, send_buffer, sblen, 0);
if (sent != sblen)
strcpy (send_buffer, &send_buffer[sent]);
sblen -= sent;
}
}
}
/* In STR, insert a & before each &, each space, each newline, and
any initial -. Change spaces to underscores, too, so that the
return value never contains a space.
Does not change the string. Outputs the result to STREAM. */
void
quote_argument (s, str)
HSOCKET s;
char *str;
{
char *copy = (char *) xmalloc (strlen (str) * 2 + 1);
char *p, *q;
p = str;
q = copy;
while (*p)
{
if (*p == ' ')
{
*q++ = '&';
*q++ = '_';
p++;
}
else if (*p == '\n')
{
*q++ = '&';
*q++ = 'n';
p++;
}
else
{
if (*p == '&' || (*p == '-' && p == str))
*q++ = '&';
*q++ = *p++;
}
}
*q++ = 0;
send_to_emacs (s, copy);
free (copy);
}
/* The inverse of quote_argument. Removes quoting in string STR by
modifying the string in place. Returns STR. */
char *
unquote_argument (str)
char *str;
{
char *p, *q;
if (! str)
return str;
p = str;
q = str;
while (*p)
{
if (*p == '&')
{
p++;
if (*p == '&')
*p = '&';
else if (*p == '_')
*p = ' ';
else if (*p == 'n')
*p = '\n';
else if (*p == '-')
*p = '-';
}
*q++ = *p++;
}
*q = 0;
return str;
}
int
file_name_absolute_p (filename)
const unsigned char *filename;
{
/* Sanity check, it shouldn't happen. */
if (! filename) return FALSE;
/* /xxx is always an absolute path. */
if (filename[0] == '/') return TRUE;
/* Empty filenames (which shouldn't happen) are relative. */
if (filename[0] == '\0') return FALSE;
#ifdef WINDOWSNT
/* X:\xxx is always absolute. */
if (isalpha (filename[0])
&& filename[1] == ':' && (filename[2] == '\\' || filename[2] == '/'))
return TRUE;
/* Both \xxx and \\xxx\yyy are absolute. */
if (filename[0] == '\\') return TRUE;
#endif
return FALSE;
}
#ifdef WINDOWSNT
/* Wrapper to make WSACleanup a cdecl, as required by atexit. */
void
__cdecl close_winsock ()
{
WSACleanup ();
}
/* Initialize the WinSock2 library. */
void
initialize_sockets ()
{
WSADATA wsaData;
if (WSAStartup (MAKEWORD (2, 0), &wsaData))
{
message (TRUE, "%s: error initializing WinSock2\n", progname);
exit (EXIT_FAILURE);
}
atexit (close_winsock);
}
#endif /* WINDOWSNT */
/*
* Read the information needed to set up a TCP comm channel with
* the Emacs server: host, port, pid and authentication string.
*/
int
get_server_config (server, authentication)
struct sockaddr_in *server;
char *authentication;
{
char dotted[32];
char *port;
char *pid;
FILE *config = NULL;
if (file_name_absolute_p (server_file))
config = fopen (server_file, "rb");
else
{
char *home = egetenv ("HOME");
if (home)
{
char *path = alloca (strlen (home) + strlen (server_file)
+ EXTRA_SPACE);
sprintf (path, "%s/.emacs.d/server/%s", home, server_file);
config = fopen (path, "rb");
}
#ifdef WINDOWSNT
if (!config && (home = egetenv ("APPDATA")))
{
char *path = alloca (strlen (home) + strlen (server_file)
+ EXTRA_SPACE);
sprintf (path, "%s/.emacs.d/server/%s", home, server_file);
config = fopen (path, "rb");
}
#endif
}
if (! config)
return FALSE;
if (fgets (dotted, sizeof dotted, config)
&& (port = strchr (dotted, ':'))
&& (pid = strchr (port, ' ')))
{
*port++ = '\0';
*pid++ = '\0';
}
else
{
message (TRUE, "%s: invalid configuration info\n", progname);
exit (EXIT_FAILURE);
}
server->sin_family = AF_INET;
server->sin_addr.s_addr = inet_addr (dotted);
server->sin_port = htons (atoi (port));
if (! fread (authentication, AUTH_KEY_LENGTH, 1, config))
{
message (TRUE, "%s: cannot read authentication info\n", progname);
exit (EXIT_FAILURE);
}
fclose (config);
emacs_pid = atoi (pid);
return TRUE;
}
HSOCKET
set_tcp_socket ()
{