Mercurial > hg > xemacs-beta

comparison src/hftctl.c @ 0:376386a54a3c r19-14

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
parents
children 8626e4521993
comparison
equal deleted inserted replaced
-1:000000000000 0:376386a54a3c
1 /* IBM has disclaimed copyright on this module. */
2
3 /* Synched up with: FSF 19.30. */
4
5 /***************************************************************/
6 /* */
7 /* Function: hftctl */
8 /* */
9 /* Syntax: */
10 /* #include <sys/ioctl.h> */
11 /* #include <sys/hft.h> */
12 /* */
13 /* int hftctl(fildes, request, arg ) */
14 /* int fildes, request; */
15 /* char *arg; */
16 /* */
17 /* Description: */
18 /* */
19 /* Does the following: */
20 /* 1. determines if fildes is pty */
21 /* does normal ioctl it is not */
22 /* 2. places fildes into raw mode */
23 /* 3. converts ioctl arguments to datastream */
24 /* 4. waits for 2 secs for acknowledgement before */
25 /* timing out. */
26 /* 5. places response in callers buffer ( just like */
27 /* ioctl. */
28 /* 6. returns fildes to its original mode */
29 /* */
30 /* User of this program should review steps 1,4, and 3. */
31 /* hftctl makes no check on the request type. It must be */
32 /* a HFT ioctl that is supported remotely. */
33 /* This program will use the SIGALRM and alarm(2). Any */
34 /* Previous alarms are lost. */
35 /* */
36 /* Users of this program are free to modify it any way */
37 /* they want. */
38 /* */
39 /* Return Value: */
40 /* */
41 /* If ioctl fails, a value of -1 is returned and errno */
42 /* is set to indicate the error. */
43 /* */
44 /***************************************************************/
45
46 #include <config.h>
47 #include "lisp.h" /* encapsulated open, close, read, write */
48
49 #include <sys/signal.h>
50 #include <errno.h>
51
52 #include <stdio.h>
53 #include <fcntl.h>
54 #include <setjmp.h>
55 #include <sys/ioctl.h>
56 #include <sys/devinfo.h>
57 #include <termios.h>
58 #include <termio.h>
59 #include <sys/hft.h>
60 #include <sys/uio.h>
61 #include <sys/tty.h>
62 /* #include <sys/pty.h> */
63
64 #define REMOTE 0x01
65
66 #undef ioctl
67 static char SCCSid[] = "com/gnuemacs/src,3.1,9021-90/05/03-5/3/90";
68
69 /*************** LOCAL DEFINES **********************************/
70
71 #define QDEV ((HFQPDEVCH<<8)|HFQPDEVCL)
72 #define QLOC ((HFQLOCCH<<8)|HFQLOCCL)
73 #define QPS ((HFQPRESCH<<8)|HFQPRESCL)
74
75 #ifndef TCGETS
76 #define TCGETS TCGETA
77 #endif
78 #ifndef TCSETS
79 #define TCSETS TCSETA
80 #endif
81
82 /*************** EXTERNAL / GLOBAL DATA AREA ********************/
83
84 static int hfqry();
85 static int hfskbd();
86
87 extern int errno;
88 static JMP_BUF hftenv;
89 static int is_ack_vtd;
90 static SIGTYPE (*sav_alrm) ();
91 static struct hfctlreq req =
92 { 0x1b,'[','x',0,0,0,21,HFCTLREQCH,HFCTLREQCL};
93 static struct hfctlack ACK =
94 { 0x1b,'[','x',0,0,0,21,HFCTLACKCH,HFCTLACKCL};
95
96 /* FUNC signal(); */
97
98 /*************** LOCAL MACROS ***********************************/
99
100 #define HFTYPE(p) ((p->hf_typehi<<8)|(p->hf_typelo))
101
102 #define BYTE4(p) ((p)[0]<<24 | (p)[1]<<16 | (p)[2]<<8 | (p)[3])
103
104 /* read a buffer */
105 #define RD_BUF(f,p,l) \
106 while ((l)) \
107 if ((j = read((f),(p),(l))) < 0) \
108 if (errno != EINTR) return (-1); \
109 else continue; \
110 else { (l) -= j; (p) += j; }
111
112 /*************** function prototypes ***************************/
113 #ifdef __STDC__
114 static GT_ACK (int fd, int req, char *buf);
115 static WR_REQ (int fd, int request, int cmdlen, char *cmd, int resplen);
116 static void hft_alrm(int sig);
117 #else
118 static GT_ACK ();
119 static WR_REQ ();
120 static void hft_alrm ();
121 #endif
122
123 /*************** HFTCTL FUNCTION *******************************/
124
125 hftctl (fd, request, arg)
126 int fd;
127 int request;
128 union {
129 struct hfintro *intro;
130 struct hfquery *query;
131 char *c;
132 } arg;
133 {
134
135 int i;
136 int fd_flag; /* fcntl flags */
137 union {
138 struct hfintro *cmd; /* p.cmd - intro des. */
139 struct hfqphdevc *ph; /* p.ph - physical dev.*/
140 char *c; /* p.c - char ptr */
141 } p; /* general pointer */
142 int pty_new; /* pty modes */
143 int pty_old;
144 int retcode;
145 struct termios term_new; /* terminal attributes */
146 struct termios term_old;
147 struct devinfo devInfo; /* defined in sys/devinfo.h */
148
149
150 if (ioctl (fd, IOCINFO, &devInfo) == -1) return(-1);
151
152 if (devInfo.devtype != DD_PSEU) /* is it a pty? */
153 return (ioctl(fd, request, arg)); /* no, do IOCTL */
154
155 /******* START PTY **************/
156 /** Pty found, possible HFT */
157 /** set new file des as raw */
158 /** as you can. */
159 /********************************/
160
161 /* Get current state of file */
162 /* descriptor & save */
163 if ((fd_flag = fcntl (fd, F_GETFL, 0)) == -1) return (-1);
164 if (ioctl (fd, TCGETS, &term_old) == -1) return (-1);
165 /* set terminal attr to raw */
166 /* and to delay on read */
167 pty_new = pty_old | REMOTE;
168 memcpy (&term_new, &term_old, sizeof (term_new));
169 term_new.c_iflag = 0;
170 term_new.c_oflag = 0;
171 term_new.c_lflag = 0;
172 /* term_new.c_line = 0; */
173 for (i = 1; i <= 5; i++)
174 term_new.c_cc[i] = 0;
175 term_new.c_cc[0] = -1;
176 ioctl (fd, TCSETS, &term_new);
177 if (fcntl (fd, F_SETFL, fd_flag & ~O_NDELAY) == -1)
178 return(-1);
179 /* call spacific function */
180 if (request == HFSKBD)
181 retcode = hfskbd (fd, request, arg.c);
182 else /* assume HFQUERY */
183 retcode = hfqry (fd, request, arg.c);
184
185 fcntl (fd, F_SETFL, fd_flag); /* reset terminal to original */
186 ioctl (fd, TCSETS, &term_old);
187
188
189 return (retcode); /* return error */
190 }
191
192 /*************** HFSKBD FUNCTION ******************************/
193 static int
194 hfskbd (fd, request, arg)
195 int fd;
196 int request;
197 struct hfbuf *arg;
198 {
199 WR_REQ(fd, request, arg->hf_buflen, arg->hf_bufp,0);
200 return (GT_ACK(fd, request, arg->hf_bufp));
201 }
202
203 /*************** HFQUERY FUNCTION ******************************/
204 static int
205 hfqry (fd, request, arg)
206 int fd;
207 int request;
208 struct hfquery *arg;
209 {
210 WR_REQ(fd, request, arg->hf_cmdlen, arg->hf_cmd, arg->hf_resplen);
211 return (GT_ACK(fd, request, arg->hf_resp));
212 }
213
214
215 /*************** GT_ACK FUNCTION ******************************/
216 static int
217 GT_ACK (fd, req, buf)
218 int fd;
219 int req;
220 char *buf;
221 {
222 struct hfctlack ack;
223 int i = sizeof (ack);
224 int j = 0;
225 union {
226 char *c;
227 struct hfctlack *ack;
228 } p;
229
230 is_ack_vtd = 0; /* flag no ACT VTD yet */
231
232 if (SETJMP (hftenv)) /* set environment in case */
233 { /* of time out */
234 errno = ENODEV; /* if time out, set errno */
235 return (-1); /* flag error */
236 }
237
238 alarm(3); /* time out in 3 secs */
239 sav_alrm = signal (SIGALRM, hft_alrm); /* prepare to catch time out */
240
241 p.ack = &ack;
242 while (! is_ack_vtd) /* do until valid ACK VTD */
243 {
244 RD_BUF(fd, p.c, i); /* read until a ACK VTD is fill*/
245
246 if (! memcmp (&ack, &ACK, sizeof (HFINTROSZ)) /* the ACK intro & */
247 && (ack.hf_request == req)) /* is it the response we want ?*/
248 { /* yes, ACK VTD found */
249 is_ack_vtd = 1; /* quickly, flag it */
250 break; /* get the %$%#@ out of here */
251 }
252
253 p.ack = &ack; /* no, then skip 1st */
254 ++p.c; /* char and start over */
255 i = sizeof (ack) - 1; /* one less ESC to cry over */
256
257 while ((*p.c != 0x1b) && i) /* scan for next ESC */
258 { ++p.c; --i; } /* if any */
259
260 (i ? memcpy (&ack, p.c, i) : 0); /* if any left over, then move */
261 p.ack = &ack; /* ESC to front of ack struct */
262 p.c += i; /* skip over whats been read */
263 i = sizeof (ack) - i; /* set whats left to be read */
264 } /***** TRY AGAIN */
265
266 alarm(0); /* ACK VTD received, reset alrm*/
267 signal (SIGALRM, sav_alrm); /* reset signal */
268
269 if (i = ack.hf_arg_len) /* any data following ? */
270 { /* yes, */
271 RD_BUF(fd,buf,i); /* read until it is received */
272 }
273
274 if (errno = ack.hf_retcode) /* set errno based on returned */
275 return (-1); /* code, if 0, then no error */
276 else
277 return (0); /* if set, then error returned */
278 }
279
280 /*************** HFT_ALRM FUNCTION ******************************/
281 static void
282 hft_alrm (sig) /* Function hft_alrm - handle */
283 int sig; /* alarm signal */
284 {
285 signal (SIGALRM, sav_alrm); /* reset to previous */
286
287 if (is_ack_vtd) /* has ack vtd arrived ? */
288 return; /* yes, then continue */
289 else /* no, then return with error */
290 LONGJMP (hftenv, -1);
291
292 }
293
294 /*********************************************************************/
295 /*** ***/
296 /*** NOTE: Both the HFCTLREQ and the arg structure should be ***/
297 /*** sent in one io write operation. If terminal ***/
298 /*** emulators are in NODELAY mode then multiple writes ***/
299 /*** may cause bogus information to be read by the emulator ***/
300 /*** depending on the timing. ***/
301 /*** ***/
302 /*********************************************************************/
303
304 static int
305 WR_REQ (fd, request, cmdlen, cmd, resplen)
306 int fd;
307 int request;
308 int cmdlen;
309 char *cmd;
310 int resplen;
311 {
312 struct {
313 char *c;
314 struct hfctlreq *req;
315 } p;
316 int size;
317
318 req.hf_request = request;
319 req.hf_arg_len = cmdlen;
320 req.hf_rsp_len = resplen;
321
322 if (cmdlen) /* if arg structure to pass */
323 {
324 size = sizeof (struct hfctlreq) + cmdlen;
325 if ((p.c = xmalloc(size)) == NULL) /* malloc one area */
326 return (-1);
327
328 memcpy (p.c, &req, sizeof (req)); /* copy CTL REQ struct */
329 memcpy (p.c + sizeof (req), cmd, cmdlen); /* copy arg struct */
330 }
331 else
332 {
333 p.req = &req; /* otherwise use only CTL REQ */
334 size = sizeof (req);
335 }
336
337 /* write request to terminal */
338 if (write(fd,p.c,size) == -1) return (-1);
339 if (p.req != &req) /* free if allocated */
340 xfree (p.c);
341 return (0);
342 }