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