code.delx.au - gnu-emacs/blob - src/hftctl.c

   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            *xmalloc();
  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 void hft_alrm(int sig);
 114 #else
 115 static GT_ACK ();
 116 static WR_REQ ();
 117 static void 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 = signal (SIGALRM, 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, 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 void
 279 hft_alrm (sig)                  /* Function hft_alrm - handle */
 280      int sig;                   /* alarm signal               */
 281 {
 282   signal (SIGALRM, sav_alrm);   /* reset to previous          */
 283
 284   if (is_ack_vtd)               /* has ack vtd arrived ?      */
 285     return;                     /* 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 = xmalloc(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     xfree (p.c);
 338   return (0);
 339
 340 }