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1.1 root 1: /* IBM has disclaimed copyright on this module. */
2:
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: /***************************************************************/
43:
44:
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
59:
60: #undef ioctl
61: static char SCCSid[] = "com/gnuemacs/src,3.1,9021-90/05/03-5/3/90";
62:
63: /*************** LOCAL DEFINES **********************************/
64:
65: typedef int (*FUNC)(); /* pointer to a function */
66:
67: #define QDEV ((HFQPDEVCH<<8)|HFQPDEVCL)
68: #define QLOC ((HFQLOCCH<<8)|HFQLOCCL)
69: #define QPS ((HFQPRESCH<<8)|HFQPRESCL)
70:
71: #ifndef TCGETS
72: #define TCGETS TCGETA
73: #endif
74: #ifndef TCSETS
75: #define TCSETS TCSETA
76: #endif
77:
78: /*************** EXTERNAL / GLOBAL DATA AREA ********************/
79:
80: static int hfqry();
81: static int hfskbd();
82: char *malloc();
83:
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};
92:
93: /* FUNC signal(); */
94:
95: /*************** LOCAL MACROS ***********************************/
96:
97: #define HFTYPE(p) ((p->hf_typehi<<8)|(p->hf_typelo))
98:
99: #define BYTE4(p) ((p)[0]<<24 | (p)[1]<<16 | (p)[2]<<8 | (p)[3])
100:
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; }
108:
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
119:
120: /*************** HFTCTL FUNCTION *******************************/
121:
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;
130: {
131:
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 */
145:
146:
147: if (ioctl (fd, IOCINFO, &devInfo) == -1) return(-1);
148:
149: if (devInfo.devtype != DD_PSEU) /* is it a pty? */
150: return (ioctl(fd, request, arg)); /* no, do IOCTL */
151:
152: /******* START PTY **************/
153: /** Pty found, possible HFT */
154: /** set new file des as raw */
155: /** as you can. */
156: /********************************/
157:
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);
181:
182: fcntl (fd, F_SETFL, fd_flag); /* reset terminal to original */
183: ioctl (fd, TCSETS, &term_old);
184:
185:
186: return (retcode); /* return error */
187: }
188:
189: /*************** HFSKBD FUNCTION ******************************/
190: static int
191: hfskbd (fd, request, arg)
192: int fd;
193: int request;
194: struct hfbuf *arg;
195: {
196: WR_REQ(fd, request, arg->hf_buflen, arg->hf_bufp,0);
197: return (GT_ACK(fd, request, arg->hf_bufp));
198: }
199:
200: /*************** HFQUERY FUNCTION ******************************/
201: static int
202: hfqry (fd, request, arg)
203: int fd;
204: int request;
205: struct hfquery *arg;
206: {
207: WR_REQ(fd, request, arg->hf_cmdlen, arg->hf_cmd, arg->hf_resplen);
208: return (GT_ACK(fd, request, arg->hf_resp));
209: }
210:
211:
212: /*************** GT_ACK FUNCTION ******************************/
213: static int
214: GT_ACK (fd, req, buf)
215: int fd;
216: int req;
217: char *buf;
218: {
219: struct hfctlack ack;
220: int i = sizeof (ack);
221: int j = 0;
222: union {
223: char *c;
224: struct hfctlack *ack;
225: } p;
226:
227: is_ack_vtd = 0; /* flag no ACT VTD yet */
228:
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 */
233: }
234:
235: alarm(3); /* time out in 3 secs */
236: sav_alrm = (FUNC) signal (SIGALRM, (void(*)())hft_alrm); /* prepare to catch time out */
237:
238: p.ack = &ack;
239: while (! is_ack_vtd) /* do until valid ACK VTD */
240: {
241: RD_BUF(fd, p.c, i); /* read until a ACK VTD is fill*/
242:
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 */
248: }
249:
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 */
253:
254: while ((*p.c != 0x1b) && i) /* scan for next ESC */
255: { ++p.c; --i; } /* if any */
256:
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 */
262:
263: alarm(0); /* ACK VTD received, reset alrm*/
264: signal (SIGALRM, (void(*)())sav_alrm); /* reset signal */
265:
266: if (i = ack.hf_arg_len) /* any data following ? */
267: { /* yes, */
268: RD_BUF(fd,buf,i); /* read until it is received */
269: }
270:
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 */
275: }
276:
277: /*************** HFT_ALRM FUNCTION ******************************/
278: static int
279: hft_alrm (sig) /* Function hft_alrm - handle */
280: int sig; /* alarm signal */
281: {
282: signal (SIGALRM, (void(*)())sav_alrm); /* reset to previous */
283:
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);
288:
289: }
290:
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: /*********************************************************************/
300:
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;
308: {
309: struct {
310: char *c;
311: struct hfctlreq *req;
312: } p;
313: int size;
314:
315: req.hf_request = request;
316: req.hf_arg_len = cmdlen;
317: req.hf_rsp_len = resplen;
318:
319: if (cmdlen) /* if arg structure to pass */
320: {
321: size = sizeof (struct hfctlreq) + cmdlen;
322: if ((p.c = malloc(size)) == NULL) /* malloc one area */
323: return (-1);
324:
325: memcpy (p.c, &req, sizeof (req)); /* copy CTL REQ struct */
326: memcpy (p.c + sizeof (req), cmd, cmdlen); /* copy arg struct */
327: }
328: else
329: {
330: p.req = &req; /* otherwise use only CTL REQ */
331: size = sizeof (req);
332: }
333:
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);
339:
340: }
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