/* Client process that communicates with GNU Emacs acting as server.
- Copyright (C) 1986, 1987, 1994 Free Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001
+ Free Software Foundation, Inc.
This file is part of GNU Emacs.
#define NO_SHORTNAMES
-#include <../src/config.h>
-#undef read
-#undef write
-#undef open
-#undef close
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#undef signal
+#include <ctype.h>
#include <stdio.h>
#include <getopt.h>
-#ifdef STDC_HEADERS
-#include <stdlib.h>
-#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
+#ifdef VMS
+# include "vms-pwd.h"
+#else
+# include <pwd.h>
+#endif /* not VMS */
+
char *getenv (), *getwd ();
char *getcwd ();
/* 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;
+
+/* The display on which Emacs should work. --display. */
+char *display = NULL;
+
+/* If non-NULL, the name of an editor to fallback to if the server
+ is not running. --alternate-editor. */
+const char * alternate_editor = NULL;
+
void print_help_and_exit ();
struct option longopts[] =
{
{ "no-wait", no_argument, NULL, 'n' },
+ { "eval", no_argument, NULL, 'e' },
{ "help", no_argument, NULL, 'H' },
{ "version", no_argument, NULL, 'V' },
- { 0 }
+ { "alternate-editor", required_argument, NULL, 'a' },
+ { "display", required_argument, NULL, 'd' },
+ { 0, 0, 0, 0 }
};
/* Decode the options from argv and argc.
while (1)
{
int opt = getopt_long (argc, argv,
- "VHn", longopts, 0);
+ "VHnea:d:", longopts, 0);
if (opt == EOF)
break;
+ alternate_editor = getenv ("ALTERNATE_EDITOR");
+
switch (opt)
{
case 0:
long-named option. We should do nothing. */
break;
+ case 'a':
+ alternate_editor = optarg;
+ break;
+
+ case 'd':
+ display = optarg;
+ break;
+
case 'n':
nowait = 1;
break;
+ case 'e':
+ eval = 1;
+ break;
+
case 'V':
fprintf (stderr, "emacsclient %s\n", VERSION);
exit (1);
print_help_and_exit ()
{
fprintf (stderr,
- "Usage: %s [-n] [--no-wait] [+LINENUMBER] FILENAME\n",
- progname);
- fprintf (stderr,
- "Or %s --version\n",
- progname);
- fprintf (stderr,
- "Report bugs to bug-gnu-emacs@gnu.org.\n");
+ "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\
+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\
+-a, --alternate-editor=EDITOR\n\
+ Editor to fallback to if the server is not running\n\
+Report bugs to bug-gnu-emacs@gnu.org.\n", progname);
exit (1);
}
/* Return a copy of NAME, inserting a &
- before each &, each space, and any initial -.
+ before each &, each space, each newline, and any initial -.
Change spaces to underscores, too, so that the
return value never contains a space. */
*q++ = '_';
p++;
}
+ else if (*p == '\n')
+ {
+ *q++ = '&';
+ *q++ = 'n';
+ p++;
+ }
else
{
if (*p == '&' || (*p == '-' && p == name))
return result;
}
\f
-#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
+/*
+ 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);
+ return;
+ }
+ else
+ {
+ exit (1);
+ }
+}
+
+\f
+#if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM)
+
+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 or System V IPC.\n");
- exit (1);
-}
+ fprintf (stderr, "on systems with Berkeley sockets.\n");
-#else /* HAVE_SOCKETS or HAVE_SYSVIPC */
+ fail (argc, argv);
+}
-#if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM)
-/* BSD code is very different from SYSV IPC code */
+#else /* HAVE_SOCKETS */
#include <sys/types.h>
#include <sys/socket.h>
extern char *strerror ();
extern int errno;
+/* Three possibilities:
+ 2 - can't be `stat'ed (sets errno)
+ 1 - isn't owned by us
+ 0 - success: none of the above */
+
+static int
+socket_status (socket_name)
+ char *socket_name;
+{
+ struct stat statbfr;
+
+ if (stat (socket_name, &statbfr) == -1)
+ return 2;
+
+ if (statbfr.st_uid != geteuid ())
+ return 1;
+
+ return 0;
+}
+
int
main (argc, argv)
int argc;
{
char *system_name;
int system_name_length;
- int s, i;
+ int s, i, needlf = 0;
FILE *out, *in;
struct sockaddr_un server;
- char *homedir, *cwd, *str;
+ char *cwd, *str;
char string[BUFSIZ];
progname = argv[0];
if (argc - optind < 1)
print_help_and_exit ();
- /*
+ /*
* Open up an AF_UNIX socket in this person's home directory
*/
{
fprintf (stderr, "%s: ", argv[0]);
perror ("socket");
- exit (1);
+ fail (argc, argv);
}
+
server.sun_family = AF_UNIX;
{
+ char *dot;
system_name_length = 32;
while (1)
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';
}
-#ifndef SERVER_HOME_DIR
{
- struct stat statbfr;
+ int sock_status = 0;
- sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
+ sprintf (server.sun_path, "/tmp/esrv%d-%s", (int) geteuid (), system_name);
- if (stat (server.sun_path, &statbfr) == -1)
+ /* See if the socket exists, and if it's owned by us. */
+ sock_status = socket_status (server.sun_path);
+ if (sock_status)
{
- if (errno == ENOENT)
- fprintf (stderr,
- "%s: can't find socket; have you started the server?\n",
- argv[0]);
- else
- fprintf (stderr, "%s: can't stat %s: %s\n",
- argv[0], server.sun_path, strerror (errno));
- exit (1);
- }
- if (statbfr.st_uid != geteuid ())
- {
- fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
- exit (1);
+ /* Failing that, see if LOGNAME or USER exist and differ from
+ our euid. If so, look for a socket based on the UID
+ associated with the name. This is reminiscent of the logic
+ that init_editfns uses to set the global Vuser_full_name. */
+
+ char *user_name = (char *) getenv ("LOGNAME");
+ if (!user_name)
+ user_name = (char *) getenv ("USER");
+
+ if (user_name)
+ {
+ struct passwd *pw = getpwnam (user_name);
+ if (pw && (pw->pw_uid != geteuid ()))
+ {
+ /* We're running under su, apparently. */
+ sprintf (server.sun_path, "/tmp/esrv%d-%s",
+ (int) pw->pw_uid, system_name);
+ 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 (errno == ENOENT)
+ fprintf (stderr,
+ "%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 (errno));
+ fail (argc, argv);
+ break;
+ }
}
-#else
- if ((homedir = getenv ("HOME")) == NULL)
- {
- fprintf (stderr, "%s: No home directory\n", argv[0]);
- exit (1);
- }
- strcpy (server.sun_path, homedir);
- strcat (server.sun_path, "/.emacs-server-");
- strcat (server.sun_path, system_name);
-#endif
if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
< 0)
{
fprintf (stderr, "%s: ", argv[0]);
perror ("connect");
- exit (1);
+ fail (argc, argv);
}
/* We use the stream OUT to send our command to the server. */
{
fprintf (stderr, "%s: ", argv[0]);
perror ("fdopen");
- exit (1);
+ fail (argc, argv);
}
/* We use the stream IN to read the response.
{
fprintf (stderr, "%s: ", argv[0]);
perror ("fdopen");
- exit (1);
+ fail (argc, argv);
}
-#ifdef BSD_SYSTEM
- cwd = getwd (string);
-#else
+#ifdef HAVE_GETCWD
cwd = getcwd (string, sizeof string);
+#else
+ cwd = getwd (string);
#endif
if (cwd == 0)
{
/* getwd puts message in STRING if it fails. */
fprintf (stderr, "%s: %s (%s)\n", argv[0],
-#ifdef BSD_SYSTEM
- string,
-#else
+#ifdef HAVE_GETCWD
"Cannot get current working directory",
+#else
+ string,
#endif
strerror (errno));
- exit (1);
+ fail (argc, argv);
}
if (nowait)
fprintf (out, "-nowait ");
+ if (eval)
+ fprintf (out, "-eval ");
+
+ if (display)
+ fprintf (out, "-display %s ", quote_file_name (display));
+
for (i = optind; i < argc; i++)
{
- if (*argv[i] == '+')
+ if (eval)
+ ; /* Don't prepend any cwd or anything like that. */
+ else if (*argv[i] == '+')
{
char *p = argv[i] + 1;
- while (*p >= '0' && *p <= '9') p++;
+ while (isdigit ((unsigned char) *p) || *p == ':') p++;
if (*p != 0)
fprintf (out, "%s/", quote_file_name (cwd));
}
if (nowait)
return 0;
- printf ("Waiting for Emacs...");
- fflush (stdout);
-
- /* Now, wait for an answer and print any messages. On some systems,
- the first line we read will actually be the output we just sent.
- We can't predict whether that will happen, so if it does, we
- detect it by recognizing `Client: ' at the beginning. */
-
- while (str = fgets (string, BUFSIZ, in))
- printf ("%s", str);
-
- return 0;
-}
-
-#else /* This is the SYSV IPC section */
-
-#include <sys/types.h>
-#include <sys/ipc.h>
-#include <sys/msg.h>
-#include <sys/utsname.h>
-#include <stdio.h>
-#include <errno.h>
-extern int errno;
-
-char *getwd (), *getcwd (), *getenv ();
-struct utsname system_name;
-
-main (argc, argv)
- int argc;
- char **argv;
-{
- int s;
- key_t key;
- /* Size of text allocated in MSGP. */
- int size_allocated = BUFSIZ;
- /* Amount of text used in MSGP. */
- int used;
- struct msgbuf *msgp
- = (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated);
- struct msqid_ds * msg_st;
- char *homedir, buf[BUFSIZ];
- char gwdirb[BUFSIZ];
- char *cwd;
- char *temp;
-
- progname = argv[0];
-
- /* Process options. */
- decode_options (argc, argv);
-
- if (argc - optind < 1)
- print_help_and_exit ();
-
- /*
- * Create a message queue using ~/.emacs-server as the path for ftok
- */
- if ((homedir = getenv ("HOME")) == NULL)
- {
- fprintf (stderr, "%s: No home directory\n", argv[0]);
- exit (1);
- }
- strcpy (buf, homedir);
-#ifndef HAVE_LONG_FILE_NAMES
- /* If file names are short, we can't fit the host name. */
- strcat (buf, "/.emacs-server");
-#else
- strcat (buf, "/.emacs-server-");
- uname (&system_name);
- strcat (buf, system_name.nodename);
-#endif
- creat (buf, 0600);
- key = ftok (buf, 1); /* unlikely to be anyone else using it */
- s = msgget (key, 0600 | IPC_CREAT);
- if (s == -1)
- {
- fprintf (stderr, "%s: ", argv[0]);
- perror ("msgget");
- exit (1);
- }
-
- /* Determine working dir, so we can prefix it to all the arguments. */
-#ifdef BSD_SYSTEM
- temp = getwd (gwdirb);
-#else
- temp = getcwd (gwdirb, sizeof gwdirb);
-#endif
-
- cwd = gwdirb;
- if (temp != 0)
+ if (!eval)
{
- /* On some systems, cwd can look like `@machine/...';
- ignore everything before the first slash in such a case. */
- while (*cwd && *cwd != '/')
- cwd++;
- strcat (cwd, "/");
- }
- else
- {
-#ifdef BSD_SYSTEM
- fprintf (stderr, "%s: %s\n", argv[0], cwd);
-#else
- fprintf (stderr, "%s: Cannot get current working directory: %s\n",
- argv[0], strerror (errno));
-#endif
- exit (1);
+ printf ("Waiting for Emacs...");
+ needlf = 2;
}
+ fflush (stdout);
- msgp->mtext[0] = 0;
- used = 0;
-
- if (nowait)
- {
- strcat (msgp->mtext, "-nowait ");
- used += 8;
- }
-
- argc -= optind;
- argv += optind;
-
- while (argc)
- {
- int need_cwd = 0;
- char *modified_arg = argv[0];
-
- if (*modified_arg == '+')
- {
- char *p = modified_arg + 1;
- while (*p >= '0' && *p <= '9') p++;
- if (*p != 0)
- need_cwd = 1;
- }
- else if (*modified_arg != '/')
- need_cwd = 1;
-
- modified_arg = quote_file_name (modified_arg);
-
- if (need_cwd)
- /* Overestimate in case we have to quote something in CWD. */
- used += 2 * strlen (cwd);
- used += strlen (modified_arg) + 1;
- while (used + 2 > size_allocated)
- {
- size_allocated *= 2;
- msgp = (struct msgbuf *) realloc (msgp,
- (sizeof (struct msgbuf)
- + size_allocated));
- }
-
- if (need_cwd)
- strcat (msgp->mtext, quote_file_name (cwd));
-
- strcat (msgp->mtext, modified_arg);
- strcat (msgp->mtext, " ");
- argv++; argc--;
- }
- strcat (msgp->mtext, "\n");
-#ifdef HPUX /* HPUX has a bug. */
- if (strlen (msgp->mtext) >= 512)
+ /* Now, wait for an answer and print any messages. */
+ while ((str = fgets (string, BUFSIZ, in)))
{
- fprintf (stderr, "%s: args too long for msgsnd\n", progname);
- exit (1);
- }
-#endif
- msgp->mtype = 1;
- if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
- {
- fprintf (stderr, "%s: ", progname);
- perror ("msgsnd");
- exit (1);
+ if (needlf == 2)
+ printf ("\n");
+ printf ("%s", str);
+ needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
}
- /* Maybe wait for an answer. */
- if (nowait)
- return 0;
-
- printf ("Waiting for Emacs...");
+ if (needlf)
+ printf ("\n");
fflush (stdout);
- msgrcv (s, msgp, BUFSIZ, getpid (), 0); /* wait for anything back */
- strcpy (buf, msgp->mtext);
-
- printf ("\n");
- if (*buf)
- printf ("%s\n", buf);
- exit (0);
+ return 0;
}
-#endif /* HAVE_SYSVIPC */
-
-#endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
+#endif /* HAVE_SOCKETS */
\f
#ifndef HAVE_STRERROR
char *