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[emacs.git] / src / hftctl.c
blob6ba1e2fb7fd59e5214496426ebd6d2bbdaf28064
1 /* IBM has disclaimed copyright on this module. */
3 /***************************************************************/
4 /* */
5 /* Function: hftctl */
6 /* */
7 /* Syntax: */
8 /* #include <sys/ioctl.h> */
9 /* #include <sys/hft.h> */
10 /* */
11 /* int hftctl(fildes, request, arg ) */
12 /* int fildes, request; */
13 /* char *arg; */
14 /* */
15 /* Description: */
16 /* */
17 /* Does the following: */
18 /* 1. determines if fildes is pty */
19 /* does normal ioctl it is not */
20 /* 2. places fildes into raw mode */
21 /* 3. converts ioctl arguments to datastream */
22 /* 4. waits for 2 secs for acknowledgement before */
23 /* timimg out. */
24 /* 5. places response in callers buffer ( just like */
25 /* ioctl. */
26 /* 6. returns fildes to its original mode */
27 /* */
28 /* User of this program should review steps 1,4, and 3. */
29 /* hftctl makes no check on the request type. It must be */
30 /* a HFT ioctl that is supported remotely. */
31 /* This program will use the SIGALRM and alarm(2). Any */
32 /* Previous alarms are lost. */
33 /* */
34 /* Users of this program are free to modify it any way */
35 /* they want. */
36 /* */
37 /* Return Value: */
38 /* */
39 /* If ioctl fails, a value of -1 is returned and errno */
40 /* is set to indicate the error. */
41 /* */
42 /***************************************************************/
45 #include <stdio.h>
46 #include <fcntl.h>
47 #include <errno.h>
48 #include <setjmp.h>
49 #include <sys/ioctl.h>
50 #include <sys/signal.h>
51 #include <sys/devinfo.h>
52 #include <termios.h>
53 #include <termio.h>
54 #include <sys/hft.h>
55 #include <sys/uio.h>
56 #include <sys/tty.h>
57 /* #include <sys/pty.h> */
58 #define REMOTE 0x01
60 #undef ioctl
61 static char SCCSid[] = "com/gnuemacs/src,3.1,9021-90/05/03-5/3/90";
63 /*************** LOCAL DEFINES **********************************/
65 typedef int (*FUNC)(); /* pointer to a function */
67 #define QDEV ((HFQPDEVCH<<8)|HFQPDEVCL)
68 #define QLOC ((HFQLOCCH<<8)|HFQLOCCL)
69 #define QPS ((HFQPRESCH<<8)|HFQPRESCL)
71 #ifndef TCGETS
72 #define TCGETS TCGETA
73 #endif
74 #ifndef TCSETS
75 #define TCSETS TCSETA
76 #endif
78 /*************** EXTERNAL / GLOBAL DATA AREA ********************/
80 static int hfqry();
81 static int hfskbd();
82 char *malloc();
84 extern int errno;
85 static jmp_buf hftenv;
86 static int is_ack_vtd;
87 static FUNC sav_alrm;
88 static struct hfctlreq req =
89 { 0x1b,'[','x',0,0,0,21,HFCTLREQCH,HFCTLREQCL};
90 static struct hfctlack ACK =
91 { 0x1b,'[','x',0,0,0,21,HFCTLACKCH,HFCTLACKCL};
93 /* FUNC signal(); */
95 /*************** LOCAL MACROS ***********************************/
97 #define HFTYPE(p) ((p->hf_typehi<<8)|(p->hf_typelo))
99 #define BYTE4(p) ((p)[0]<<24 | (p)[1]<<16 | (p)[2]<<8 | (p)[3])
101 /* read a buffer */
102 #define RD_BUF(f,p,l) \
103 while ((l)) \
104 if ((j = read((f),(p),(l))) < 0) \
105 if (errno != EINTR) return (-1); \
106 else continue; \
107 else { (l) -= j; (p) += j; }
109 /*************** function prototypes ***************************/
110 #ifdef __STDC__
111 static GT_ACK (int fd, int req, char *buf);
112 static WR_REQ (int fd, int request, int cmdlen, char *cmd, int resplen);
113 static hft_alrm(int sig);
114 #else
115 static GT_ACK ();
116 static WR_REQ ();
117 static hft_alrm ();
118 #endif
120 /*************** HFTCTL FUNCTION *******************************/
122 hftctl (fd, request, arg)
123 int fd;
124 int request;
125 union {
126 struct hfintro *intro;
127 struct hfquery *query;
128 char *c;
129 } arg;
132 int i;
133 int fd_flag; /* fcntl flags */
134 register union {
135 struct hfintro *cmd; /* p.cmd - intro des. */
136 struct hfqphdevc *ph; /* p.ph - physical dev.*/
137 char *c; /* p.c - char ptr */
138 } p; /* general pointer */
139 int pty_new; /* pty modes */
140 int pty_old;
141 int retcode;
142 struct termios term_new; /* terminal attributes */
143 struct termios term_old;
144 struct devinfo devInfo; /* defined in sys/devinfo.h */
147 if (ioctl (fd, IOCINFO, &devInfo) == -1) return(-1);
149 if (devInfo.devtype != DD_PSEU) /* is it a pty? */
150 return (ioctl(fd, request, arg)); /* no, do IOCTL */
152 /******* START PTY **************/
153 /** Pty found, possible HFT */
154 /** set new file des as raw */
155 /** as you can. */
156 /********************************/
158 /* Get current state of file */
159 /* descriptor & save */
160 if ((fd_flag = fcntl (fd, F_GETFL, 0)) == -1) return (-1);
161 if (ioctl (fd, TCGETS, &term_old) == -1) return (-1);
162 /* set terminal attr to raw */
163 /* and to delay on read */
164 pty_new = pty_old | REMOTE;
165 memcpy (&term_new, &term_old, sizeof (term_new));
166 term_new.c_iflag = 0;
167 term_new.c_oflag = 0;
168 term_new.c_lflag = 0;
169 /* term_new.c_line = 0; */
170 for (i = 1; i <= 5; i++)
171 term_new.c_cc[i] = 0;
172 term_new.c_cc[0] = -1;
173 ioctl (fd, TCSETS, &term_new);
174 if (fcntl (fd, F_SETFL, fd_flag & ~O_NDELAY) == -1)
175 return(-1);
176 /* call spacific function */
177 if (request == HFSKBD)
178 retcode = hfskbd (fd, request, arg.c);
179 else /* assume HFQUERY */
180 retcode = hfqry (fd, request, arg.c);
182 fcntl (fd, F_SETFL, fd_flag); /* reset terminal to original */
183 ioctl (fd, TCSETS, &term_old);
186 return (retcode); /* return error */
189 /*************** HFSKBD FUNCTION ******************************/
190 static int
191 hfskbd (fd, request, arg)
192 int fd;
193 int request;
194 struct hfbuf *arg;
196 WR_REQ(fd, request, arg->hf_buflen, arg->hf_bufp,0);
197 return (GT_ACK(fd, request, arg->hf_bufp));
200 /*************** HFQUERY FUNCTION ******************************/
201 static int
202 hfqry (fd, request, arg)
203 int fd;
204 int request;
205 struct hfquery *arg;
207 WR_REQ(fd, request, arg->hf_cmdlen, arg->hf_cmd, arg->hf_resplen);
208 return (GT_ACK(fd, request, arg->hf_resp));
212 /*************** GT_ACK FUNCTION ******************************/
213 static int
214 GT_ACK (fd, req, buf)
215 int fd;
216 int req;
217 char *buf;
219 struct hfctlack ack;
220 int i = sizeof (ack);
221 int j = 0;
222 union {
223 char *c;
224 struct hfctlack *ack;
225 } p;
227 is_ack_vtd = 0; /* flag no ACT VTD yet */
229 if (setjmp (hftenv)) /* set environment in case */
230 { /* of time out */
231 errno = ENODEV; /* if time out, set errno */
232 return (-1); /* flag error */
235 alarm(3); /* time out in 3 secs */
236 sav_alrm = signal (SIGALRM, hft_alrm); /* prepare to catch time out */
238 p.ack = &ack;
239 while (! is_ack_vtd) /* do until valid ACK VTD */
241 RD_BUF(fd, p.c, i); /* read until a ACK VTD is fill*/
243 if (! memcmp (&ack, &ACK, sizeof (HFINTROSZ)) /* the ACK intro & */
244 && (ack.hf_request == req)) /* is it the response we want ?*/
245 { /* yes, ACK VTD found */
246 is_ack_vtd = 1; /* quickly, flag it */
247 break; /* get the %$%#@ out of here */
250 p.ack = &ack; /* no, then skip 1st */
251 ++p.c; /* char and start over */
252 i = sizeof (ack) - 1; /* one less ESC to cry over */
254 while ((*p.c != 0x1b) && i) /* scan for next ESC */
255 { ++p.c; --i; } /* if any */
257 (i ? memcpy (&ack, p.c, i) : 0); /* if any left over, then move */
258 p.ack = &ack; /* ESC to front of ack struct */
259 p.c += i; /* skip over whats been read */
260 i = sizeof (ack) - i; /* set whats left to be read */
261 } /***** TRY AGAIN */
263 alarm(0); /* ACK VTD received, reset alrm*/
264 signal (SIGALRM, sav_alrm); /* reset signal */
266 if (i = ack.hf_arg_len) /* any data following ? */
267 { /* yes, */
268 RD_BUF(fd,buf,i); /* read until it is received */
271 if (errno = ack.hf_retcode) /* set errno based on returned */
272 return (-1); /* code, if 0, then no error */
273 else
274 return (0); /* if set, then error returned */
277 /*************** HFT_ALRM FUNCTION ******************************/
278 static int
279 hft_alrm (sig) /* Function hft_alrm - handle */
280 int sig; /* alarm signal */
282 signal (SIGALRM, sav_alrm); /* reset to previous */
284 if (is_ack_vtd) /* has ack vtd arrived ? */
285 return(0); /* yes, then continue */
286 else /* no, then return with error */
287 longjmp (hftenv, -1);
291 /*********************************************************************/
292 /*** ***/
293 /*** NOTE: Both the HFCTLREQ and the arg structure should be ***/
294 /*** sent in one io write operation. If terminal ***/
295 /*** emulators are in NODELAY mode then multiple writes ***/
296 /*** may cause bogus information to be read by the emulator ***/
297 /*** depending on the timing. ***/
298 /*** ***/
299 /*********************************************************************/
301 static int
302 WR_REQ (fd, request, cmdlen, cmd, resplen)
303 int fd;
304 int request;
305 int cmdlen;
306 char *cmd;
307 int resplen;
309 struct {
310 char *c;
311 struct hfctlreq *req;
312 } p;
313 int size;
315 req.hf_request = request;
316 req.hf_arg_len = cmdlen;
317 req.hf_rsp_len = resplen;
319 if (cmdlen) /* if arg structure to pass */
321 size = sizeof (struct hfctlreq) + cmdlen;
322 if ((p.c = malloc(size)) == NULL) /* malloc one area */
323 return (-1);
325 memcpy (p.c, &req, sizeof (req)); /* copy CTL REQ struct */
326 memcpy (p.c + sizeof (req), cmd, cmdlen); /* copy arg struct */
328 else
330 p.req = &req; /* otherwise use only CTL REQ */
331 size = sizeof (req);
334 /* write request to terminal */
335 if (write(fd,p.c,size) == -1) return (-1);
336 if (p.req != &req) /* free if allocated */
337 free (p.c);
338 return (0);