1 /* 2 TiMidity++ -- MIDI to WAVE converter and player 3 Copyright (C) 1999-2002 Masanao Izumo <mo@goice.co.jp> 4 Copyright (C) 1995 Tuukka Toivonen <tt@cgs.fi> 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 20 motif_pipe.c: written by Vincent Pagel (pagel@loria.fr) 10/4/95 21 22 pipe communication between motif interface and sound generator 23 24 Copied from the motif_p source. - Glenn Trigg, 29 Oct 1998 25 26 */ 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif /* HAVE_CONFIG_H*/ 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include <stdarg.h> 36 #include <errno.h> 37 #include <sys/ioctl.h> 38 #ifdef SOLARIS 39 #include <sys/filio.h> 40 #endif 41 #ifndef NO_STRING_H 42 #include <string.h> 43 #else 44 #include <strings.h> 45 #endif 46 #include <sys/time.h> 47 #include <sys/types.h> 48 49 50 #include "timidity.h" 51 #include "controls.h" 52 #include "gtk_h.h" 53 54 int pipeAppli[2],pipeGtk[2]; /* Pipe for communication with Gtk+ process */ 55 int fpip_in, fpip_out; /* in and out depends in which process we are */ 56 int pid; /* Pid for child process */ 57 58 /* DATA VALIDITY CHECK */ 59 #define INT_CODE 214 60 #define STRING_CODE 216 61 62 #define DEBUGPIPE 63 64 /***********************************************************************/ 65 /* PIPE COMUNICATION */ 66 /***********************************************************************/ 67 68 static void 69 pipe_error(char *st) 70 { 71 fprintf(stderr,"CONNECTION PROBLEM WITH Gtk+ PROCESS IN %s BECAUSE:%s\n", 72 st, 73 strerror(errno)); 74 exit(1); 75 } 76 77 78 /***************************************** 79 * INT * 80 *****************************************/ 81 82 void 83 gtk_pipe_int_write(int c) 84 { 85 int len; 86 int code=INT_CODE; 87 88 #ifdef DEBUGPIPE 89 len = write(fpip_out,&code,sizeof(code)); 90 if (len!=sizeof(code)) 91 pipe_error("PIPE_INT_WRITE"); 92 #endif 93 94 len = write(fpip_out,&c,sizeof(c)); 95 if (len!=sizeof(int)) 96 pipe_error("PIPE_INT_WRITE"); 97 } 98 99 void 100 gtk_pipe_int_read(int *c) 101 { 102 int len; 103 104 #ifdef DEBUGPIPE 105 int code; 106 107 len = read(fpip_in,&code,sizeof(code)); 108 if (len!=sizeof(code)) 109 pipe_error("PIPE_INT_READ"); 110 if (code!=INT_CODE) 111 fprintf(stderr,"BUG ALERT ON INT PIPE %i\n",code); 112 #endif 113 114 len = read(fpip_in,c, sizeof(int)); 115 if (len!=sizeof(int)) pipe_error("PIPE_INT_READ"); 116 } 117 118 119 120 /***************************************** 121 * STRINGS * 122 *****************************************/ 123 124 void 125 gtk_pipe_string_write(char *str) 126 { 127 int len, slen; 128 129 #ifdef DEBUGPIPE 130 int code=STRING_CODE; 131 132 len = write(fpip_out,&code,sizeof(code)); 133 if (len!=sizeof(code)) pipe_error("PIPE_STRING_WRITE"); 134 #endif 135 136 slen=strlen(str); 137 len = write(fpip_out,&slen,sizeof(slen)); 138 if (len!=sizeof(slen)) pipe_error("PIPE_STRING_WRITE"); 139 140 len = write(fpip_out,str,slen); 141 if (len!=slen) pipe_error("PIPE_STRING_WRITE on string part"); 142 } 143 144 void 145 gtk_pipe_string_read(char *str) 146 { 147 int len, slen; 148 149 #ifdef DEBUGPIPE 150 int code; 151 152 len = read(fpip_in,&code,sizeof(code)); 153 if (len!=sizeof(code)) pipe_error("PIPE_STRING_READ"); 154 if (code!=STRING_CODE) fprintf(stderr,"BUG ALERT ON STRING PIPE %i\n",code); 155 #endif 156 157 len = read(fpip_in,&slen,sizeof(slen)); 158 if (len!=sizeof(slen)) pipe_error("PIPE_STRING_READ"); 159 160 len = read(fpip_in,str,slen); 161 if (len!=slen) pipe_error("PIPE_STRING_READ on string part"); 162 str[slen]='\0'; /* Append a terminal 0 */ 163 } 164 165 int 166 gtk_pipe_read_ready(void) 167 { 168 fd_set fds; 169 int cnt; 170 struct timeval timeout; 171 172 FD_ZERO(&fds); 173 FD_SET(fpip_in, &fds); 174 timeout.tv_sec = timeout.tv_usec = 0; 175 if((cnt = select(fpip_in + 1, &fds, NULL, NULL, &timeout)) < 0) 176 { 177 perror("select"); 178 return -1; 179 } 180 181 return cnt > 0 && FD_ISSET(fpip_in, &fds) != 0; 182 } 183 184 void 185 gtk_pipe_open(void) 186 { 187 int res; 188 189 res=pipe(pipeAppli); 190 if (res!=0) pipe_error("PIPE_APPLI CREATION"); 191 192 res=pipe(pipeGtk); 193 if (res!=0) pipe_error("PIPE_GTK CREATION"); 194 195 if ((pid=fork())==0) { /*child*/ 196 close(pipeGtk[1]); 197 close(pipeAppli[0]); 198 199 fpip_in=pipeGtk[0]; 200 fpip_out= pipeAppli[1]; 201 202 Launch_Gtk_Process(fpip_in); 203 /* Won't come back from here */ 204 fprintf(stderr,"WARNING: come back from Gtk+\n"); 205 exit(0); 206 } 207 208 close(pipeGtk[0]); 209 close(pipeAppli[1]); 210 211 fpip_in= pipeAppli[0]; 212 fpip_out= pipeGtk[1]; 213 } 214