/* Client process that communicates with GNU Emacs acting as server.
- Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2003, 2004
- Free Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004,
+ 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GNU Emacs.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
#define NO_SHORTNAMES
#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>
+
+# define NO_SOCKETS_IN_FILE_SYSTEM
+
+# define HSOCKET SOCKET
+# define CLOSE_SOCKET closesocket
+# define INITIALIZE() (initialize_sockets ())
+
+#else /* !WINDOWSNT */
+
+# include <sys/types.h>
+
+# ifdef HAVE_INET_SOCKETS
+# include <netinet/in.h>
+# endif
+
+# define INVALID_SOCKET -1
+# define HSOCKET int
+# define CLOSE_SOCKET close
+# define INITIALIZE()
+
+#endif /* !WINDOWSNT */
+
#undef signal
+#include <stdarg.h>
#include <ctype.h>
#include <stdio.h>
-#include <getopt.h>
+#include "getopt.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef VMS
# include "vms-pwd.h"
-#else
+#else /* not VMS */
+#ifdef WINDOWSNT
+# include <io.h>
+#else /* not WINDOWSNT */
# include <pwd.h>
+#endif /* not WINDOWSNT */
#endif /* not VMS */
char *getenv (), *getwd ();
-char *getcwd ();
-
-/* This is defined with -D from the compilation command,
- which extracts it from ../lisp/version.el. */
+char *(getcwd) ();
#ifndef VERSION
#define VERSION "unspecified"
#endif
\f
+#define SEND_STRING(data) (send_to_emacs (s, (data)))
+#define SEND_QUOTED(data) (quote_file_name (s, (data)))
+
+#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
+\f
/* Name used to invoke this program. */
char *progname;
/* If non-NULL, the name of an editor to fallback to if the server
is not running. --alternate-editor. */
-const char * alternate_editor = NULL;
+const char *alternate_editor = NULL;
/* If non-NULL, the filename of the UNIX socket. */
char *socket_name = NULL;
-void print_help_and_exit ();
+/* 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[] =
{
{ "help", no_argument, NULL, 'H' },
{ "version", no_argument, NULL, 'V' },
{ "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' },
{ "display", required_argument, NULL, 'd' },
{ 0, 0, 0, 0 }
};
+/* Message functions. */
+
+#ifdef WINDOWSNT
+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);
+
+ return window_app;
+}
+#endif
+
+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. */
int argc;
char **argv;
{
+ alternate_editor = getenv ("ALTERNATE_EDITOR");
+
while (1)
{
int opt = getopt_long (argc, argv,
- "VHnea:s:d:", longopts, 0);
+#ifndef NO_SOCKETS_IN_FILE_SYSTEM
+ "VHnea:s:f:d:",
+#else
+ "VHnea:f:d:",
+#endif
+ longopts, 0);
if (opt == EOF)
break;
- alternate_editor = getenv ("ALTERNATE_EDITOR");
-
switch (opt)
{
case 0:
alternate_editor = optarg;
break;
+#ifndef NO_SOCKETS_IN_FILE_SYSTEM
case 's':
socket_name = optarg;
break;
+#endif
+
+ case 'f':
+ server_file = optarg;
+ break;
case 'd':
display = optarg;
break;
case 'V':
- printf ("emacsclient %s\n", VERSION);
- exit (0);
+ message (FALSE, "emacsclient %s\n", VERSION);
+ exit (EXIT_SUCCESS);
break;
case 'H':
break;
default:
- fprintf (stderr, "Try `%s --help' for more information\n", progname);
- exit (1);
+ message (TRUE, "Try `%s --help' for more information\n", progname);
+ exit (EXIT_FAILURE);
break;
}
}
void
print_help_and_exit ()
{
- printf (
+ 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 a version info and return\n\
--H, --help Print this usage information message\n\
--n, --no-wait Don't wait for the server to return\n\
--e, --eval Evaluate the FILE arguments as ELisp expressions\n\
--d, --display=DISPLAY Visit the file in the given display\n\
--s, --socket-name=FILENAME\n\
- Set the filename of the UNIX socket for communication\n\
+\n\
+-V, --version Just print version info and return\n\
+-H, --help Print this usage information message\n\
+-e, --eval Evaluate FILE arguments as Lisp expressions\n\
+-n, --no-wait Don't wait for the server to return\n\
+-d, --display=DISPLAY Visit the file in the given display\n"
+#ifndef NO_SOCKETS_IN_FILE_SYSTEM
+"-s, --socket-name=FILENAME\n\
+ Set filename of the UNIX socket for communication\n"
+#endif
+"-f, --server-file=FILENAME\n\
+ Set filename of the TCP authentication file\n\
-a, --alternate-editor=EDITOR\n\
- Editor to fallback to if the server is not running\n\
+ Editor to fallback to if server is not running\n\
\n\
Report bugs to bug-gnu-emacs@gnu.org.\n", progname);
- exit (0);
+ exit (EXIT_SUCCESS);
+}
+
+\f
+#ifdef WINDOWSNT
+
+/*
+ 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
+
+#endif /* WINDOWSNT */
+
+/*
+ Try to run a different command, or --if no alternate editor is
+ defined-- exit with an errorcode.
+*/
+void
+fail (argc, argv)
+ int argc;
+ char **argv;
+{
+ if (alternate_editor)
+ {
+ int i = optind - 1;
+
+ execvp (alternate_editor, argv + i);
+ message (TRUE, "%s: error executing alternate editor \"%s\"\n",
+ progname, alternate_editor);
+ }
+ exit (EXIT_FAILURE);
+}
+
+\f
+#if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS)
+
+int
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ message (TRUE, "%s: Sorry, the Emacs server is supported only\non systems with Berkely sockets.\n",
+ argv[0]);
+
+ fail (argc, argv);
+}
+
+#else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
+
+#ifdef WINDOWSNT
+# include <winsock2.h>
+#else
+# include <sys/types.h>
+# include <sys/socket.h>
+# include <sys/un.h>
+# include <sys/stat.h>
+# include <errno.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. */
+
+/* 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 NAME, 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. */
-
void
-quote_file_name (name, stream)
+quote_file_name (s, name)
+ HSOCKET s;
char *name;
- FILE *stream;
{
char *copy = (char *) malloc (strlen (name) * 2 + 1);
char *p, *q;
}
*q++ = 0;
- fprintf (stream, copy);
+ SEND_STRING (copy);
free (copy);
}
-/* Like malloc but get fatal error if memory is exhausted. */
+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;
-long *
-xmalloc (size)
- unsigned int size;
+ /* 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;
+
+ /*
+ FIXME: There's a corner case not dealt with, "x:y", where:
+
+ 1) x is a valid drive designation (usually a letter in the A-Z range)
+ and y is a path, relative to the current directory on drive x. This
+ is absolute, *after* fixing the y part to include the current
+ directory in x.
+
+ 2) x is a relative file name, and y is an NTFS stream name. This is a
+ correct relative path, but it is very unusual.
+
+ The trouble is that first case items are also valid examples of the
+ second case, i.e., "c:test" can be understood as drive:path or as
+ file:stream.
+
+ The "right" fix would involve checking whether
+ - the current drive/partition is NTFS,
+ - x is a valid (and accesible) drive designator,
+ - x:y already exists as a file:stream in the current directory,
+ - y already exists on the current directory of drive x,
+ - the auspices are favorable,
+ and then taking an "informed decision" based on the above.
+
+ Whatever the result, Emacs currently does a very bad job of dealing
+ with NTFS file:streams: it cannot visit them, and the only way to
+ create one is by setting `buffer-file-name' to point to it (either
+ manually or with emacsclient). So perhaps resorting to 1) and ignoring
+ 2) for now is the right thing to do.
+
+ Anyway, something to decide After the Release.
+ */
+#endif
+
+ return FALSE;
+}
+
+#ifdef WINDOWSNT
+/* Wrapper to make WSACleanup a cdecl, as required by atexit. */
+void
+__cdecl close_winsock ()
{
- long *result = (long *) malloc (size);
- if (result == NULL)
- {
- perror ("malloc");
- exit (1);
- }
- return result;
+ WSACleanup ();
}
+
+/* Initialize the WinSock2 library. */
+void
+initialize_sockets ()
+{
+ WSADATA wsaData;
+
+ if (WSAStartup (MAKEWORD (2, 0), &wsaData))
+ {
+ message (TRUE, "%s: error initializing WinSock2", progname);
+ exit (EXIT_FAILURE);
+ }
+
+ atexit (close_winsock);
+}
+#endif /* WINDOWSNT */
\f
/*
- Try to run a different command, or --if no alternate editor is
- defined-- exit with an errorcode.
-*/
-void
-fail (argc, argv)
- int argc;
- char **argv;
+ * 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;
{
- if (alternate_editor)
+ char dotted[32];
+ char *port;
+ char *pid;
+ FILE *config = NULL;
+
+ if (file_name_absolute_p (server_file))
+ config = fopen (server_file, "rb");
+ else
{
- int i = optind - 1;
- execvp (alternate_editor, argv + i);
- return;
+ char *home = getenv ("HOME");
+
+ if (home)
+ {
+ char *path = alloca (32 + strlen (home) + strlen (server_file));
+ sprintf (path, "%s/.emacs.d/server/%s", home, server_file);
+ config = fopen (path, "rb");
+ }
+#ifdef WINDOWSNT
+ if (!config && (home = getenv ("APPDATA")))
+ {
+ char *path = alloca (32 + strlen (home) + strlen (server_file));
+ 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
{
- exit (1);
+ message (TRUE, "%s: invalid configuration info", progname);
+ exit (EXIT_FAILURE);
}
-}
+ server->sin_family = AF_INET;
+ server->sin_addr.s_addr = inet_addr (dotted);
+ server->sin_port = htons (atoi (port));
-\f
-#if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM)
+ if (! fread (authentication, AUTH_KEY_LENGTH, 1, config))
+ {
+ message (TRUE, "%s: cannot read authentication info", progname);
+ exit (EXIT_FAILURE);
+ }
-int
-main (argc, argv)
- int argc;
- char **argv;
-{
- fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
- argv[0]);
- fprintf (stderr, "on systems with Berkeley sockets.\n");
+ fclose (config);
- fail (argc, argv);
+ emacs_pid = atoi (pid);
+
+ return TRUE;
}
-#else /* HAVE_SOCKETS */
+HSOCKET
+set_tcp_socket ()
+{
+ HSOCKET s;
+ struct sockaddr_in server;
+ struct linger l_arg = {1, 1};
+ char auth_string[AUTH_KEY_LENGTH + 1];
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <sys/stat.h>
-#include <errno.h>
+ if (! get_server_config (&server, auth_string))
+ return INVALID_SOCKET;
-extern char *strerror ();
-extern int errno;
+ if (server.sin_addr.s_addr != inet_addr ("127.0.0.1"))
+ message (FALSE, "%s: connected to remote socket at %s\n",
+ progname, inet_ntoa (server.sin_addr));
+
+ /*
+ * Open up an AF_INET socket
+ */
+ if ((s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
+ {
+ message (TRUE, "%s: socket: %s\n", progname, strerror (errno));
+ return INVALID_SOCKET;
+ }
+
+ /*
+ * Set up the socket
+ */
+ if (connect (s, (struct sockaddr *) &server, sizeof server) < 0)
+ {
+ message (TRUE, "%s: connect: %s\n", progname, strerror (errno));
+ return INVALID_SOCKET;
+ }
+
+ setsockopt (s, SOL_SOCKET, SO_LINGER, (char *) &l_arg, sizeof l_arg);
+
+ /*
+ * Send the authentication
+ */
+ auth_string[AUTH_KEY_LENGTH] = '\0';
+
+ SEND_STRING ("-auth ");
+ SEND_STRING (auth_string);
+ SEND_STRING ("\n");
+
+ return s;
+}
+
+#if !defined (NO_SOCKETS_IN_FILE_SYSTEM)
/* Three possibilities:
2 - can't be `stat'ed (sets errno)
return 0;
}
-int
-main (argc, argv)
- int argc;
- char **argv;
+HSOCKET
+set_local_socket ()
{
- char *system_name;
- int system_name_length;
- int s, i, needlf = 0;
- FILE *out, *in;
+ HSOCKET s;
struct sockaddr_un server;
- char *cwd, *str;
- char string[BUFSIZ];
-
- progname = argv[0];
-
- /* Process options. */
- decode_options (argc, argv);
-
- if ((argc - optind < 1) && !eval)
- {
- fprintf (stderr, "%s: file name or argument required\n", progname);
- fprintf (stderr, "Try `%s --help' for more information\n", progname);
- exit (1);
- }
/*
* Open up an AF_UNIX socket in this person's home directory
if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
{
- fprintf (stderr, "%s: ", argv[0]);
- perror ("socket");
- fail (argc, argv);
+ message (TRUE, "%s: socket: %s\n", progname, strerror (errno));
+ return INVALID_SOCKET;
}
server.sun_family = AF_UNIX;
- {
- char *dot;
- system_name_length = 32;
-
- while (1)
- {
- system_name = (char *) xmalloc (system_name_length + 1);
-
- /* system_name must be null-terminated string. */
- system_name[system_name_length] = '\0';
-
- if (gethostname (system_name, system_name_length) == 0)
- break;
-
- free (system_name);
- system_name_length *= 2;
- }
-
- /* We always use the non-dotted host name, for simplicity. */
- dot = index (system_name, '.');
- if (dot)
- *dot = '\0';
- }
-
{
int sock_status = 0;
int default_sock = !socket_name;
int saved_errno;
+ char *server_name = "server";
+
+ if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\'))
+ { /* socket_name is a file name component. */
+ server_name = socket_name;
+ socket_name = NULL;
+ default_sock = 1; /* Try both UIDs. */
+ }
if (default_sock)
{
- socket_name = alloca (system_name_length + 100);
- sprintf (socket_name, "/tmp/emacs%d-%s/server",
- (int) geteuid (), system_name);
+ socket_name = alloca (100 + strlen (server_name));
+ sprintf (socket_name, "/tmp/emacs%d/%s",
+ (int) geteuid (), server_name);
}
if (strlen (socket_name) < sizeof (server.sun_path))
strcpy (server.sun_path, socket_name);
else
{
- fprintf (stderr, "%s: socket-name %s too long",
- argv[0], socket_name);
- exit (1);
+ message (TRUE, "%s: socket-name %s too long",
+ progname, socket_name);
+ exit (EXIT_FAILURE);
}
/* See if the socket exists, and if it's owned by us. */
if (pw && (pw->pw_uid != geteuid ()))
{
/* We're running under su, apparently. */
- sprintf (socket_name, "/tmp/emacs%d-%s/server",
- (int) pw->pw_uid, system_name);
+ socket_name = alloca (100 + strlen (server_name));
+ sprintf (socket_name, "/tmp/emacs%d/%s",
+ (int) pw->pw_uid, server_name);
if (strlen (socket_name) < sizeof (server.sun_path))
strcpy (server.sun_path, socket_name);
else
{
- fprintf (stderr, "%s: socket-name %s too long",
- argv[0], socket_name);
- exit (1);
+ message (TRUE, "%s: socket-name %s too long",
+ progname, socket_name);
+ exit (EXIT_FAILURE);
}
sock_status = socket_status (server.sun_path);
}
}
- switch (sock_status)
- {
- case 1:
- /* There's a socket, but it isn't owned by us. This is OK if
- we are root. */
- if (0 != geteuid ())
- {
- fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
- fail (argc, argv);
- }
- break;
-
- case 2:
- /* `stat' failed */
- if (saved_errno == ENOENT)
- fprintf (stderr,
- "%s: can't find socket; have you started the server?\n\
+ switch (sock_status)
+ {
+ case 1:
+ /* There's a socket, but it isn't owned by us. This is OK if
+ we are root. */
+ if (0 != geteuid ())
+ {
+ message (TRUE, "%s: Invalid socket owner\n", progname);
+ return INVALID_SOCKET;
+ }
+ break;
+
+ case 2:
+ /* `stat' failed */
+ if (saved_errno == ENOENT)
+ message (TRUE,
+ "%s: can't find socket; have you started the server?\n\
To start the server in Emacs, type \"M-x server-start\".\n",
- argv[0]);
- else
- fprintf (stderr, "%s: can't stat %s: %s\n",
- argv[0], server.sun_path, strerror (saved_errno));
- fail (argc, argv);
- break;
- }
+ progname);
+ else
+ message (TRUE, "%s: can't stat %s: %s\n",
+ progname, server.sun_path, strerror (saved_errno));
+ return INVALID_SOCKET;
+ }
}
if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
< 0)
{
- fprintf (stderr, "%s: ", argv[0]);
- perror ("connect");
- fail (argc, argv);
+ message (TRUE, "%s: connect: %s\n", progname, strerror (errno));
+ return INVALID_SOCKET;
}
- /* We use the stream OUT to send our command to the server. */
- if ((out = fdopen (s, "r+")) == NULL)
+ return s;
+}
+#endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */
+
+HSOCKET
+set_socket ()
+{
+ HSOCKET s;
+
+ INITIALIZE ();
+
+#ifndef NO_SOCKETS_IN_FILE_SYSTEM
+ /* Explicit --socket-name argument. */
+ if (socket_name)
{
- fprintf (stderr, "%s: ", argv[0]);
- perror ("fdopen");
- fail (argc, argv);
+ s = set_local_socket ();
+ if ((s != INVALID_SOCKET) || alternate_editor)
+ return s;
+
+ message (TRUE, "%s: error accessing socket \"%s\"",
+ progname, socket_name);
+ exit (EXIT_FAILURE);
}
+#endif
+
+ /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */
+ if (!server_file)
+ server_file = getenv ("EMACS_SERVER_FILE");
- /* We use the stream IN to read the response.
- We used to use just one stream for both output and input
- on the socket, but reversing direction works nonportably:
- on some systems, the output appears as the first input;
- on other systems it does not. */
- if ((in = fdopen (s, "r+")) == NULL)
+ if (server_file)
{
- fprintf (stderr, "%s: ", argv[0]);
- perror ("fdopen");
- fail (argc, argv);
+ s = set_tcp_socket ();
+ if ((s != INVALID_SOCKET) || alternate_editor)
+ return s;
+
+ message (TRUE, "%s: error accessing server file \"%s\"",
+ progname, server_file);
+ exit (EXIT_FAILURE);
+ }
+
+#ifndef NO_SOCKETS_IN_FILE_SYSTEM
+ /* Implicit local socket. */
+ s = set_local_socket ();
+ if (s != INVALID_SOCKET)
+ return s;
+#endif
+
+ /* Implicit server file. */
+ server_file = "server";
+ s = set_tcp_socket ();
+ if ((s != INVALID_SOCKET) || alternate_editor)
+ return s;
+
+ /* No implicit or explicit socket, and no alternate editor. */
+ message (TRUE, "%s: No socket or alternate editor. Please use:\n\n"
+#ifndef NO_SOCKETS_IN_FILE_SYSTEM
+"\t--socket-name\n"
+#endif
+"\t--server-file (or environment variable EMACS_SERVER_FILE)\n\
+\t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n",
+ progname);
+ exit (EXIT_FAILURE);
+}
+
+#ifdef WINDOWSNT
+FARPROC set_fg; /* Pointer to AllowSetForegroundWindow. */
+FARPROC get_wc; /* Pointer to RealGetWindowClassA. */
+
+BOOL CALLBACK
+w32_find_emacs_process (hWnd, lParam)
+ HWND hWnd;
+ LPARAM lParam;
+{
+ DWORD pid;
+ char class[6];
+
+ /* Reject any window not of class "Emacs". */
+ if (! get_wc (hWnd, class, sizeof (class))
+ || strcmp (class, "Emacs"))
+ return TRUE;
+
+ /* We only need the process id, not the thread id. */
+ (void) GetWindowThreadProcessId (hWnd, &pid);
+
+ /* Not the one we're looking for. */
+ if (pid != (DWORD) emacs_pid) return TRUE;
+
+ /* OK, let's raise it. */
+ set_fg (emacs_pid);
+
+ /* Stop enumeration. */
+ return FALSE;
+}
+
+/*
+ * Search for a window of class "Emacs" and owned by a process with
+ * process id = emacs_pid. If found, allow it to grab the focus.
+ */
+void
+w32_give_focus ()
+{
+ HMODULE hUser32;
+
+ /* It shouldn't happen when dealing with TCP sockets. */
+ if (!emacs_pid) return;
+
+ if (!(hUser32 = LoadLibrary ("user32.dll"))) return;
+
+ /* Modern Windows restrict which processes can set the foreground window.
+ emacsclient can allow Emacs to grab the focus by calling the function
+ AllowSetForegroundWindow. Unfortunately, older Windows (W95, W98 and
+ NT) lack this function, so we have to check its availability. */
+ if ((set_fg = GetProcAddress (hUser32, "AllowSetForegroundWindow"))
+ && (get_wc = GetProcAddress (hUser32, "RealGetWindowClassA")))
+ EnumWindows (w32_find_emacs_process, (LPARAM) 0);
+
+ FreeLibrary (hUser32);
+}
+#endif
+
+int
+main (argc, argv)
+ int argc;
+ char **argv;
+{
+ HSOCKET s;
+ int i, rl, needlf = 0;
+ char *cwd;
+ char string[BUFSIZ+1];
+
+ progname = argv[0];
+
+ /* Process options. */
+ decode_options (argc, argv);
+
+ if ((argc - optind < 1) && !eval)
+ {
+ message (TRUE, "%s: file name or argument required\nTry `%s --help' for more information\n",
+ progname, progname);
+ exit (EXIT_FAILURE);
}
+ if ((s = set_socket ()) == INVALID_SOCKET)
+ fail (argc, argv);
+
#ifdef HAVE_GETCWD
cwd = getcwd (string, sizeof string);
#else
if (cwd == 0)
{
/* getwd puts message in STRING if it fails. */
-
+ message (TRUE, "%s: %s (%s)\n", progname,
#ifdef HAVE_GETCWD
- fprintf (stderr, "%s: %s (%s)\n", argv[0],
- "Cannot get current working directory", strerror (errno));
+ "Cannot get current working directory",
#else
- fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
+ string,
#endif
+ strerror (errno));
fail (argc, argv);
}
+#ifdef WINDOWSNT
+ w32_give_focus ();
+#endif
+
if (nowait)
- fprintf (out, "-nowait ");
+ SEND_STRING ("-nowait ");
if (eval)
- fprintf (out, "-eval ");
+ SEND_STRING ("-eval ");
if (display)
{
- fprintf (out, "-display ");
- quote_file_name (display, out);
- fprintf (out, " ");
+ SEND_STRING ("-display ");
+ SEND_QUOTED (display);
+ SEND_STRING (" ");
}
if ((argc - optind > 0))
while (isdigit ((unsigned char) *p) || *p == ':') p++;
if (*p != 0)
{
- quote_file_name (cwd, out);
- fprintf (out, "/");
+ SEND_QUOTED (cwd);
+ SEND_STRING ("/");
}
}
- else if (*argv[i] != '/')
+ else if (! file_name_absolute_p (argv[i]))
{
- quote_file_name (cwd, out);
- fprintf (out, "/");
+ SEND_QUOTED (cwd);
+ SEND_STRING ("/");
}
- quote_file_name (argv[i], out);
- fprintf (out, " ");
+ SEND_QUOTED (argv[i]);
+ SEND_STRING (" ");
}
}
else
{
- while ((str = fgets (string, BUFSIZ, stdin)))
+ while (fgets (string, BUFSIZ, stdin))
{
- quote_file_name (str, out);
+ SEND_QUOTED (string);
}
- fprintf (out, " ");
+ SEND_STRING (" ");
}
-
- fprintf (out, "\n");
- fflush (out);
-
- /* Maybe wait for an answer. */
- if (nowait)
- return 0;
- if (!eval)
- {
- printf ("Waiting for Emacs...");
- needlf = 2;
- }
- fflush (stdout);
+ SEND_STRING ("\n");
- /* Now, wait for an answer and print any messages. */
- while ((str = fgets (string, BUFSIZ, in)))
+ /* Maybe wait for an answer. */
+ if (!nowait)
{
- if (needlf == 2)
- printf ("\n");
- printf ("%s", str);
- needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
+ if (!eval)
+ {
+ printf ("Waiting for Emacs...");
+ needlf = 2;
+ }
+ fflush (stdout);
+
+ /* Now, wait for an answer and print any messages. */
+ while ((rl = recv (s, string, BUFSIZ, 0)) > 0)
+ {
+ string[rl] = '\0';
+ if (needlf == 2)
+ printf ("\n");
+ printf ("%s", string);
+ needlf = string[0] == '\0' ? needlf : string[strlen (string) - 1] != '\n';
+ }
+
+ if (needlf)
+ printf ("\n");
+ fflush (stdout);
}
- if (needlf)
- printf ("\n");
- fflush (stdout);
-
- return 0;
+ CLOSE_SOCKET (s);
+ return EXIT_SUCCESS;
}
-#endif /* HAVE_SOCKETS */
-\f
+#endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
+
#ifndef HAVE_STRERROR
char *
strerror (errnum)
/* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
(do not change this comment) */
+
+/* emacsclient.c ends here */
HCoop / bpt / emacs.git / blobdiff