1: # include   "../ingres.h"
   2: # include   "../aux.h"
   3: # include   "../symbol.h"
   4: # include   "../tree.h"
   5: # include   "../pipes.h"
   6: # include   "qrymod.h"
   7: 
   8: /*
   9: **  ISSUE -- issue query to rest of system
  10: **
  11: **	This function issues a query to the rest of the INGRES system.
  12: **	It can deal with true queries (that is, a tree), or with a
  13: **	DBU request (which must already be in the pipe).
  14: **
  15: **	The sync from below is read, but not passed up; a pointer
  16: **	to it (or NULL if none) is returned.
  17: **
  18: **	Parameters:
  19: **		execid -- the execid to call.
  20: **		funcid -- the function to call.
  21: **		tree -- NULL -- just sync from below.
  22: **			else -- pointer to tree to issue.
  23: **
  24: **	Returns:
  25: **		The resultcode of the query.
  26: **
  27: **	Side Effects:
  28: **		A query is executed.
  29: **
  30: **	Requires:
  31: **		wrpipe, rdpipe
  32: **		writeqry
  33: **		pipetrwr
  34: **
  35: **	Called By:
  36: **		main
  37: **		qrymod
  38: **
  39: **	Compilation Flags:
  40: **		none
  41: **
  42: **	Trace Flags:
  43: **		13
  44: **
  45: **	History:
  46: **		2/14/79 -- version 6.2 released.
  47: */
  48: 
  49: extern struct pipfrmt   Outpipe;
  50: 
  51: struct retcode *
  52: issue(execid, funcid, tree)
  53: char    execid;
  54: char    funcid;
  55: QTREE   *tree;
  56: {
  57:     register QTREE      *t;
  58:     extern          pipetrwr();
  59:     static struct retcode   rc;
  60:     register int        i;
  61:     register struct retcode *r;
  62: 
  63:     t = tree;
  64:     r = &rc;
  65: 
  66: #	ifdef xQTR2
  67:     if (tTf(13, 1))
  68:         printf("issue:\n");
  69: #	endif
  70:     /* write query tree if given */
  71:     if (t != NULL)
  72:     {
  73:         wrpipe(P_PRIME, &Outpipe, execid, 0, funcid);
  74:         writeqry(t, &pipetrwr);
  75:         wrpipe(P_END, &Outpipe, W_down);
  76:     }
  77: 
  78:     /* sync with below */
  79: #	ifdef xQTR2
  80:     if (tTf(13, 2))
  81:         printf("issue: response:\n");
  82: #	endif
  83:     rdpipe(P_PRIME, &Outpipe);
  84:     i = rdpipe(P_NORM, &Outpipe, R_down, r, sizeof *r);
  85:     rdpipe(P_SYNC, &Outpipe, R_down);
  86:     if (i == 0)
  87:         return (NULL);
  88:     else
  89:         return (r);
  90: }
  91: /*
  92: **  ISSUEINVERT -- issue a query, but invert the qualification
  93: **
  94: **	This routine is similar to 'issue', except that it issues
  95: **	a query with the qualification inverted.  The inversion
  96: **	(and subsequent tree normalization) is done on a duplicate
  97: **	of the tree.
  98: **
  99: **	Parameters:
 100: **		root -- the root of the tree to issue.
 101: **
 102: **	Returns:
 103: **		pointer to retcode struct.
 104: **
 105: **	Side Effects:
 106: **		'root' is issued.
 107: **
 108: **	Requires:
 109: **		tree -- to create a 'NOT' node.
 110: **		treedup -- to create a copy of the tree.
 111: **		trimqlend, norml -- to normalize after inversion.
 112: **		issue -- to do the actual issue.
 113: **
 114: **	Called By:
 115: **		d_integ
 116: **
 117: **	Trace Flags:
 118: **		none
 119: */
 120: 
 121: struct retcode *
 122: issueinvert(root)
 123: QTREE   *root;
 124: {
 125:     register QTREE      *t;
 126:     extern QTREE        *tree(), *treedup();
 127:     extern QTREE        *trimqlend(), *norml();
 128:     register struct retcode *r;
 129:     extern struct retcode   *issue();
 130: 
 131:     /* make duplicate of tree */
 132:     t = treedup(root);
 133: 
 134:     /* prepend NOT node to qualification */
 135:     t->right = tree(NULL, t->right, UOP, 2, opNOT);
 136: 
 137:     /* normalize and issue */
 138:     t->right = norml(trimqlend(t->right));
 139:     r = issue(EXEC_DECOMP, 0, t);
 140: 
 141: #	ifdef xQTR3
 142:     /* check for valid return */
 143:     if (r == NULL)
 144:         syserr("issueinvert: NULL rc");
 145: #	endif
 146: 
 147:     return (r);
 148: }
 149: /*
 150: **  PIPETRWR -- write tree to W_down pipe
 151: **
 152: **	Acts like a 'wrpipe' call, with some arguments included
 153: **	implicitly.
 154: **
 155: **	Parameters:
 156: **		val -- the value to write.
 157: **		len -- the length.
 158: **
 159: **	Returns:
 160: **		same as wrpipe.
 161: **
 162: **	Side Effects:
 163: **		activity on 'Outpipe'.
 164: **
 165: **	Requires:
 166: **		wrpipe
 167: **		Outpipe -- a primed pipe for writing.
 168: **
 169: **	Required By:
 170: **		issue.
 171: */
 172: 
 173: pipetrwr(val, len)
 174: char    *val;
 175: int len;
 176: {
 177:     return (wrpipe(P_NORM, &Outpipe, W_down, val, len));
 178: }
 179: /*
 180: **  NULLSYNC -- send null query to sync Equel program
 181: **
 182: **	On a RETRIEVE to terminal, Equel is left reading the data
 183: **	pipe by the time we get to this point; on an error (which
 184: **	will prevent the running of the original query) we must
 185: **	somehow unhang it.  The solution is to send a completely
 186: **	null query, as so:
 187: **
 188: **			ROOT
 189: **		       /    \
 190: **		    TREE   QLEND
 191: **
 192: **	This will cause OVQP to send a sync back to the EQUEL program,
 193: **	incuring an incredible amount of overhead in the process
 194: **	(but it was his own fault!).
 195: **
 196: **	Parameters:
 197: **		none
 198: **
 199: **	Returns:
 200: **		none
 201: **
 202: **	Side Effects:
 203: **		Space is grabbed from Qbuf.
 204: **		A query is sent.
 205: **
 206: **	Requires:
 207: **		tree() -- to create the relevant nodes.
 208: **		issue() -- to send the query.
 209: **
 210: **	Called By:
 211: **		ferror()
 212: **
 213: **	Trace Flags:
 214: **		none
 215: **
 216: **	Diagnostics:
 217: **		none
 218: **
 219: **	Syserrs:
 220: **		none
 221: */
 222: 
 223: struct retcode *
 224: nullsync()
 225: {
 226:     register QTREE      *t;
 227:     extern struct retcode   *issue();
 228:     register struct retcode *rc;
 229:     QTREE           *tree();
 230: 
 231:     t = tree(tree(NULL, NULL, TREE, 0), tree(NULL, NULL, QLEND, 0), ROOT, 0);
 232:     rc = issue(EXEC_DECOMP, '0', t);
 233:     return (rc);
 234: }

Defined functions

issue defined in line 51; used 7 times
issueinvert defined in line 121; used 2 times
nullsync defined in line 223; used 2 times
pipetrwr defined in line 173; used 2 times
Last modified: 1995-02-19
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