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
pipe_error(char * st)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
gtk_pipe_int_write(int c)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
gtk_pipe_int_read(int * c)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
gtk_pipe_string_write(char * str)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
gtk_pipe_string_read(char * str)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
gtk_pipe_read_ready(void)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
gtk_pipe_open(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