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0
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1 /* Communication subprocess for GNU Emacs acting as server.
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2 Copyright (C) 1986, 1987, 1993 Free Software Foundation, Inc.
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3
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4 This file is part of GNU Emacs.
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5
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6 GNU Emacs is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 GNU Emacs is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GNU Emacs; see the file COPYING. If not, write to
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18 the Free the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.28. */
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22
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23 /* The GNU Emacs edit server process is run as a subprocess of Emacs
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24 under control of the file lisp/server.el.
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25 This program accepts communication from client (program emacsclient.c)
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26 and passes their commands (consisting of keyboard characters)
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27 up to the Emacs which then executes them. */
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28
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29 #define NO_SHORTNAMES
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30 #include <../src/config.h>
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31 #undef read
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32 #undef write
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33 #undef open
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34 #undef close
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35 #undef signal
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36
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37 #if __STDC__ || defined(STDC_HEADERS)
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38 # include <stdlib.h>
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39 # include <unistd.h>
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40 # include <fcntl.h> /* for creat() */
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41 # include <string.h>
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42 #else
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43 extern int errno;
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44 #endif
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45
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46 #if !defined(HAVE_SOCKETS) && !defined(HAVE_SYSVIPC)
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47 #include <stdio.h>
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48
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49 void
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50 main ()
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51 {
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52 fprintf (stderr, "Sorry, the Emacs server is supported only on systems\n");
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53 fprintf (stderr, "with Berkeley sockets or System V IPC.\n");
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54 exit (1);
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55 }
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56
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57 #else /* HAVE_SOCKETS or HAVE_SYSVIPC */
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58
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59 #if ! defined (HAVE_SYSVIPC)
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60 /* BSD code is very different from SYSV IPC code */
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61
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62 #include <sys/types.h>
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63 #include <sys/file.h>
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64 #include <sys/signal.h>
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65 #include <sys/stat.h> /* Needed for chmod, at least on Linux */
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66 #include <sys/un.h>
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67 #include <stdio.h>
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68 #include <errno.h>
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70
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69 #include "../src/sysproc.h" /* Needed for select */
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114
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70 #ifndef SOCK_STREAM
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71 /* this is normally included by src/sysproc.h. might be safe to omit
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72 * it entirely. lousy ultrix's sys/socket.h chokes if it's included
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73 * twice, so we can't include unconditionally. */
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74 #include <sys/socket.h>
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75 #endif
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0
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76
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77 void
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78 main ()
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79 {
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80 char system_name[256];
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81 int s, infd, fromlen;
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82 struct sockaddr_un server, fromunix;
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83 char *str, string[BUFSIZ], code[BUFSIZ];
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84 FILE *infile;
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85 FILE **openfiles;
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86 int openfiles_size;
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87
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88 openfiles_size = 20;
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89 openfiles = (FILE **) malloc (openfiles_size * sizeof (FILE *));
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90 if (openfiles == 0)
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91 abort ();
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92
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93 /*
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94 * Open up an AF_UNIX socket in this person's home directory
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95 */
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96
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97 if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
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98 {
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99 perror ("socket");
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100 exit (1);
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101 }
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102 memset (&server, 0, sizeof (server));
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103 server.sun_family = AF_UNIX;
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104 #ifndef SERVER_HOME_DIR
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105 gethostname (system_name, sizeof (system_name));
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106 sprintf (server.sun_path, "/tmp/esrv%d-%s", (int) geteuid (), system_name);
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107
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108 if (unlink (server.sun_path) == -1 && errno != ENOENT)
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109 {
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110 perror ("unlink");
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111 exit (1);
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112 }
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113 #else
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114 {
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115 char *homedir;
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116
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117 if ((homedir = getenv ("HOME")) == NULL)
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118 {
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119 fprintf (stderr,"No home directory\n");
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120 exit (1);
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121 }
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122 sprintf (server.sun_path, "/tmp/esrv%d", geteuid ());
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123 #if 0
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124 strcpy (server.sun_path, homedir);
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125 strcat (server.sun_path, "/.emacs_server");
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126 #endif
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127 /* Delete anyone else's old server. */
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128 unlink (server.sun_path);
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129 }
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130 #endif /* SERVER_HOME_DIR */
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131
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132 {
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133 int bindlen;
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134
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135 #ifdef HAVE_SOCKADDR_SUN_LEN
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136 /* See W. R. Stevens "Advanced Programming in the Unix Environment"
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137 p. 502 */
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138 bindlen = (sizeof (server.sun_len) + sizeof (server.sun_family)
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139 + strlen (server.sun_path) + 1);
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140 server.sun_len = bindlen;
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141 #else
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142 bindlen = strlen (server.sun_path) + sizeof (server.sun_family);
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143 #endif
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144
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145 if (bind (s, (struct sockaddr *) &server, bindlen) < 0)
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146 {
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147 perror ("bind");
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148 exit (1);
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149 }
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150 }
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151 /* Only this user can send commands to this Emacs. */
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152 chmod (server.sun_path, 0600);
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153 /*
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154 * Now, just wait for everything to come in..
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155 */
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156 if (listen (s, 5) < 0)
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157 {
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158 perror ("listen");
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159 exit (1);
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160 }
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161
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162 /* Disable sigpipes in case luser kills client... */
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163 signal (SIGPIPE, SIG_IGN);
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164 for (;;)
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165 {
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166 int rmask = (1 << s) + 1;
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167 if (select (s + 1, (fd_set *)&rmask, 0, 0, 0) < 0)
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168 perror ("select");
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169 if (rmask & (1 << s)) /* client sends list of filenames */
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170 {
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171 fromlen = sizeof (fromunix);
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172 fromunix.sun_family = AF_UNIX;
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173 infd = accept (s, (struct sockaddr *) &fromunix,
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174 #ifdef HAVE_POSIX_ACCEPT
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175 /* Posix dictates that this arg should be
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176 a size_t *, but all known existing
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177 implementations want an int *. */
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178 (size_t *) &fromlen
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179 #else
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180 &fromlen
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181 #endif
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182 );
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183 if (infd < 0)
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184 {
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185 if (errno == EMFILE || errno == ENFILE)
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186 printf ("Too many clients.\n");
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187 else
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188 perror ("accept");
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189 continue;
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190 }
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191
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192 if (infd >= openfiles_size)
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193 {
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194 openfiles_size *= 2;
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195 openfiles = (FILE **) realloc (openfiles,
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196 openfiles_size * sizeof (FILE *));
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197 if (openfiles == 0)
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198 abort ();
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199 }
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200
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201 infile = (FILE *) fdopen (infd, "r+"); /* open stream */
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202 if (infile == NULL)
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203 {
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204 printf ("Too many clients.\n");
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205 write (infd, "Too many clients.\n", 18);
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206 close (infd); /* Prevent descriptor leak.. */
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207 continue;
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208 }
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209 str = fgets (string, BUFSIZ, infile);
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210 if (str == NULL)
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211 {
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212 perror ("fgets");
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213 close (infd); /* Prevent descriptor leak.. */
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214 continue;
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215 }
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216 openfiles[infd] = infile;
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217 printf ("Client: %d %s", infd, string);
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218 /* If what we read did not end in a newline,
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219 it means there is more. Keep reading from the socket
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220 and outputting to Emacs, until we get the newline. */
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221 while (string[strlen (string) - 1] != '\n')
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222 {
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223 if (fgets (string, BUFSIZ, infile) == 0)
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224 break;
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225 printf ("%s", string);
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226 }
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227 fflush (stdout);
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228 fflush (infile);
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229 continue;
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230 }
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231 else if (rmask & 1) /* emacs sends codeword, fd, and string message */
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232 {
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233 /* Read command codeword and fd */
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234 clearerr (stdin);
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235 scanf ("%s %d%*c", code, &infd);
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236
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237 if (ferror (stdin) || feof (stdin))
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238 {
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239 fprintf (stderr, "server: error reading from standard input\n");
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240 exit (1);
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241 }
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242
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243 /* Transfer text from Emacs to the client, up to a newline. */
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244 infile = openfiles[infd];
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245 while (1)
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246 {
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247 if (fgets (string, BUFSIZ, stdin) == 0)
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248 break;
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249 fprintf (infile, "%s", string);
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250 if (string[strlen (string) - 1] == '\n')
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251 break;
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252 }
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253 fflush (infile);
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254
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255 /* If command is close, close connection to client. */
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256 if (strncmp (code, "Close:", 6) == 0)
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257 if (infd > 2)
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258 {
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259 fclose (infile);
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260 close (infd);
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261 }
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262 continue;
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263 }
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264 }
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265 }
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266
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267 #else /* This is the SYSV IPC section */
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268
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269 #include <sys/types.h>
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270 #include <sys/signal.h>
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271 #include <sys/ipc.h>
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272 #include <sys/msg.h>
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273 #include <setjmp.h>
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274
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275 jmp_buf msgenv;
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276
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277 static SIGTYPE
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278 msgcatch (int arg)
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279 {
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280 longjmp (msgenv, 1);
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281 }
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282
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283
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284 /* "THIS has to be fixed. Remember, stderr may not exist...-rlk."
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285 Incorrect. This program runs as an inferior of Emacs.
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286 Its stderr always exists--rms. */
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287 #include <stdio.h>
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288
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289 #if !__STDC__ && !defined(STDC_HEADERS)
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290 #ifndef convex
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291 char *getenv ();
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292 #endif
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293 #endif
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294
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295 void
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296 main ()
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297 {
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298 int s, fromlen, ioproc;
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299 #if 0
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300 int infd;
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301 #endif /* 0 */
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302 key_t key;
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303 struct msgbuf * msgp =
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304 (struct msgbuf *) malloc (sizeof *msgp + BUFSIZ);
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305 struct msqid_ds msg_st;
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306 int p;
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307 char *homedir;
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308 char string[BUFSIZ];
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309 #if 0
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310 FILE *infile;
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311 #endif /* 0 */
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312
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313 /*
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314 * Create a message queue using ~/.emacs_server as the path for ftok
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315 */
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316 if ((homedir = getenv ("HOME")) == NULL)
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317 {
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318 fprintf (stderr,"No home directory\n");
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319 exit (1);
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320 }
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321 strcpy (string, homedir);
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322 strcat (string, "/.emacs_server");
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323 creat (string, 0600);
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324 key = ftok (string, 1); /* unlikely to be anyone else using it */
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325 s = msgget (key, 0600 | IPC_CREAT);
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326 if (s == -1)
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327 {
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328 perror ("msgget");
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329 exit (1);
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330 }
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331
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332 /* Fork so we can close connection even if parent dies */
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333 p = fork ();
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334 if (setjmp (msgenv))
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335 {
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336 msgctl (s, IPC_RMID, 0);
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337 kill (p, SIGKILL);
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338 exit (0);
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339 }
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340 signal (SIGTERM, msgcatch);
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341 signal (SIGINT, msgcatch);
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342 if (p > 0)
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343 {
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344 /* This is executed in the original process that did the fork above. */
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345 /* Get pid of Emacs itself. */
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346 p = getppid ();
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347 setpgrp (); /* Gnu kills process group on exit */
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348 while (1)
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349 {
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350 /* Is Emacs still alive? */
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351 if (kill (p, 0) < 0)
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352 {
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353 msgctl (s, IPC_RMID, 0);
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354 exit (0);
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355 }
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356 sleep (10);
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357 }
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358 }
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359
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360 /* This is executed in the child made by forking above.
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361 Call it c1. Make another process, ioproc. */
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362
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363 ioproc = fork ();
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364 if (ioproc == 0)
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365 {
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366 /* In process ioproc, wait for text from Emacs,
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367 and send it to the process c1.
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368 This way, c1 only has to wait for one source of input. */
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369 while (fgets (msgp->mtext, BUFSIZ, stdin))
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370 {
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371 msgp->mtype = 1;
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372 msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0);
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373 }
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374 exit (1);
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375 }
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376
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377 /* In the process c1,
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378 listen for messages from clients and pass them to Emacs. */
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379 while (1)
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380 {
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381 if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0)
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382 {
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383 perror ("msgrcv");
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384 exit (1);
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385 }
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386 else
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387 {
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388 msgctl (s, IPC_STAT, &msg_st);
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389
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390 /* Distinguish whether the message came from a client, or from
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391 ioproc. */
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392 if (msg_st.msg_lspid == ioproc)
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393 {
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394 char code[BUFSIZ];
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395 int inproc;
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396
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397 /* Message from ioproc: tell a client we are done. */
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398 msgp->mtext[strlen (msgp->mtext)-1] = 0;
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399 sscanf (msgp->mtext, "%s %d", code, &inproc);
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400 msgp->mtype = inproc;
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401 msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0);
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402 continue;
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403 }
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404
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405 /* This is a request from a client: copy to stdout
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406 so that Emacs will get it. Include msg_lspid
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407 so server.el can tell us where to send the reply. */
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408 strncpy (string, msgp->mtext, fromlen);
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409 string[fromlen] = 0; /* make sure */
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410 /* Newline is part of string.. */
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411 printf ("Client: %d %s", (int) msg_st.msg_lspid, string);
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412 fflush (stdout);
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413 /* Now, wait for a wakeup */
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414 }
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415 }
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416 }
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417
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418 #endif /* HAVE_SYSVIPC */
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419
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420 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
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