/* 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 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#define NO_SHORTNAMES
#include <../src/config.h>
-#undef read
-#undef write
-#undef open
-#undef close
#undef signal
+#include <stdio.h>
+#include <getopt.h>
+#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 ();
+
+/* This is defined with -D from the compilation command,
+ which extracts it from ../lisp/version.el. */
+
+#ifndef VERSION
+#define VERSION "unspecified"
+#endif
+\f
+/* Name used to invoke this program. */
+char *progname;
+
+/* Nonzero means don't wait for a response from Emacs. --no-wait. */
+int nowait = 0;
+
+void print_help_and_exit ();
+
+struct option longopts[] =
+{
+ { "no-wait", no_argument, NULL, 'n' },
+ { "help", no_argument, NULL, 'H' },
+ { "version", no_argument, NULL, 'V' },
+ { "alternate-editor",required_argument, NULL, 'a' },
+ { 0 }
+};
+
+
+const char * alternate_editor = NULL;
+
+/* 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;
+{
+ while (1)
+ {
+ int opt = getopt_long (argc, argv,
+ "VHna:", longopts, 0);
+
+ if (opt == EOF)
+ break;
+
+ alternate_editor = getenv ("ALTERNATE_EDITOR");
+
+ 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;
+
+ case 'n':
+ nowait = 1;
+ break;
+
+ case 'V':
+ fprintf (stderr, "emacsclient %s\n", VERSION);
+ exit (1);
+ break;
+
+ case 'H':
+ default:
+ print_help_and_exit ();
+ }
+ }
+}
+
+void
+print_help_and_exit ()
+{
+ fprintf (stderr,
+ "Usage: %s [-a ALTERNATE-EDITOR] [-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");
+ exit (1);
+}
+
+/* Return a copy of NAME, inserting a &
+ before each &, each space, and any initial -.
+ Change spaces to underscores, too, so that the
+ return value never contains a space. */
+
+char *
+quote_file_name (name)
+ char *name;
+{
+ char *copy = (char *) malloc (strlen (name) * 2 + 1);
+ char *p, *q;
+
+ p = name;
+ q = copy;
+ while (*p)
+ {
+ if (*p == ' ')
+ {
+ *q++ = '&';
+ *q++ = '_';
+ p++;
+ }
+ else
+ {
+ if (*p == '&' || (*p == '-' && p == name))
+ *q++ = '&';
+ *q++ = *p++;
+ }
+ }
+ *q++ = 0;
+
+
+ return copy;
+}
+
+/* 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 (1);
+ }
+ return result;
+}
+\f
+/*
+ Try to run a different command, or --if no alternate editor is
+ defined-- exit with an errorcode.
+*/
+fail (argc, argv)
+ int argc;
+ char **argv;
+{
+ if (alternate_editor)
+ {
+ int i = optind -1 ;
+ execvp (alternate_editor, argv + i);
+ }
+ else
+ {
+ exit (1);
+ }
+}
+
+
+\f
#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
-#include <stdio.h>
main (argc, argv)
int argc;
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);
+
+ fail (argc, argv);
}
#else /* HAVE_SOCKETS or HAVE_SYSVIPC */
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
-#include <stdio.h>
#include <errno.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 **argv;
{
- char system_name[32];
+ char *system_name;
+ int system_name_length;
int s, i;
- FILE *out;
+ FILE *out, *in;
struct sockaddr_un server;
char *homedir, *cwd, *str;
char string[BUFSIZ];
- char *getenv (), *getwd ();
- char *getcwd ();
- int geteuid ();
+ progname = argv[0];
- if (argc < 2)
- {
- fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
- exit (1);
- }
+ /* Process options. */
+ decode_options (argc, argv);
+
+ 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;
+
+ {
+ 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;
+ }
+ }
+
#ifndef SERVER_HOME_DIR
{
struct stat statbfr;
+ int sock_status = 0;
- gethostname (system_name, sizeof (system_name));
sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
- if (stat (server.sun_path, &statbfr) == -1)
- {
- if (errno == ENOENT)
- fprintf (stderr,
- "Can't find socket; have you started the server?\n");
- else
- perror ("stat");
- exit (1);
- }
- if (statbfr.st_uid != geteuid ())
+ /* See if the socket exists, and if it's owned by us. */
+ sock_status = socket_status (server.sun_path);
+ if (sock_status)
{
- fprintf (stderr, "Invalid socket owner\n");
- 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",
+ 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",
+ 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);
+ fail (argc, argv);
}
strcpy (server.sun_path, homedir);
strcat (server.sun_path, "/.emacs-server-");
- gethostname (system_name, sizeof (system_name));
strcat (server.sun_path, system_name);
#endif
{
fprintf (stderr, "%s: ", argv[0]);
perror ("connect");
- exit (1);
+ fail (argc, argv);
}
+
+ /* We use the stream OUT to send our command to the server. */
if ((out = fdopen (s, "r+")) == NULL)
{
fprintf (stderr, "%s: ", argv[0]);
perror ("fdopen");
- exit (1);
+ fail (argc, argv);
}
-#ifdef BSD
+ /* 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)
+ {
+ fprintf (stderr, "%s: ", argv[0]);
+ perror ("fdopen");
+ fail (argc, argv);
+ }
+
+#ifdef BSD_SYSTEM
cwd = getwd (string);
#else
cwd = getcwd (string, sizeof string);
if (cwd == 0)
{
/* getwd puts message in STRING if it fails. */
- fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
- exit (1);
+ fprintf (stderr, "%s: %s (%s)\n", argv[0],
+#ifdef BSD_SYSTEM
+ string,
+#else
+ "Cannot get current working directory",
+#endif
+ strerror (errno));
+ fail (argc, argv);
}
- for (i = 1; i < argc; i++)
+ if (nowait)
+ fprintf (out, "-nowait ");
+
+ for (i = optind; i < argc; i++)
{
if (*argv[i] == '+')
{
char *p = argv[i] + 1;
while (*p >= '0' && *p <= '9') p++;
if (*p != 0)
- fprintf (out, "%s/", cwd);
+ fprintf (out, "%s/", quote_file_name (cwd));
}
else if (*argv[i] != '/')
- fprintf (out, "%s/", cwd);
- fprintf (out, "%s ", argv[i]);
+ fprintf (out, "%s/", quote_file_name (cwd));
+
+ fprintf (out, "%s ", quote_file_name (argv[i]));
}
fprintf (out, "\n");
fflush (out);
+ /* Maybe wait for an answer. */
+ if (nowait)
+ return 0;
+
printf ("Waiting for Emacs...");
fflush (stdout);
- rewind (out); /* re-read the output */
- str = fgets (string, BUFSIZ, out);
-
- /* Now, wait for an answer and print any messages. */
+ /* 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, out))
+ while (str = fgets (string, BUFSIZ, in))
printf ("%s", str);
-
+
return 0;
}
#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;
char gwdirb[BUFSIZ];
char *cwd;
char *temp;
- char *progname = argv[0];
- if (argc < 2)
- {
- fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
- exit (1);
- }
+ 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
}
/* Determine working dir, so we can prefix it to all the arguments. */
-#ifdef BSD
+#ifdef BSD_SYSTEM
temp = getwd (gwdirb);
#else
temp = getcwd (gwdirb, sizeof gwdirb);
}
else
{
- fprintf (stderr, cwd);
- exit (1);
+#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
+ fail (argc, argv);
}
msgp->mtext[0] = 0;
used = 0;
- argc--; argv++;
+
+ 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;
else if (*modified_arg != '/')
need_cwd = 1;
+ modified_arg = quote_file_name (modified_arg);
+
if (need_cwd)
- used += strlen (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)
{
}
if (need_cwd)
- strcat (msgp->mtext, cwd);
+ strcat (msgp->mtext, quote_file_name (cwd));
strcat (msgp->mtext, modified_arg);
strcat (msgp->mtext, " ");
#ifdef HPUX /* HPUX has a bug. */
if (strlen (msgp->mtext) >= 512)
{
- fprintf (stderr, "emacsclient: args too long for msgsnd\n");
- exit (1);
+ fprintf (stderr, "%s: args too long for msgsnd\n", progname);
+ fail (argc, argv);
}
#endif
msgp->mtype = 1;
{
fprintf (stderr, "%s: ", progname);
perror ("msgsnd");
- exit (1);
+ fail (argc, argv);
}
- /*
- * Now, wait for an answer
- */
+
+ /* Maybe wait for an answer. */
+ if (nowait)
+ return 0;
+
printf ("Waiting for Emacs...");
fflush (stdout);
msgrcv (s, msgp, BUFSIZ, getpid (), 0); /* wait for anything back */
strcpy (buf, msgp->mtext);
- printf ("\n%s\n", buf);
+ printf ("\n");
+ if (*buf)
+ printf ("%s\n", buf);
exit (0);
}
HCoop / bpt / emacs.git / blobdiff