usr/src/cmd/refer/refer3.c

   1 /*
   2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
   7 /*        All Rights Reserved   */
   8
   9 /*
  10  * Copyright (c) 1980 Regents of the University of California.
  11  * All rights reserved. The Berkeley software License Agreement
  12  * specifies the terms and conditions for redistribution.
  13  */
  14
  15 #pragma ident   "%Z%%M% %I%     %E% SMI"
  16
  17 #include "refer..c"
  18 #define move(x, y) close(y); dup(x); close(x);
  19
  20 extern void err();
  21
  22 int
  23 corout(char *in, char *out, char *rprog, char *arg, int outlen)
  24 {
  25         int pipev[2], fr1, fr2, fw1, fw2, n;
  26         int status;
  27
  28         pipe(pipev);
  29         fr1 = pipev[0];
  30         fw1 = pipev[1];
  31         pipe(pipev);
  32         fr2 = pipev[0];
  33         fw2 = pipev[1];
  34         if (fork() == 0) {
  35                 close(fw1);
  36                 close(fr2);
  37                 move(fr1, 0);
  38                 move(fw2, 1);
  39                 execl(rprog, "deliv", arg, 0);
  40                 err("Can't run %s", rprog);
  41         }
  42         close(fw2);
  43         close(fr1);
  44         write(fw1, in, strlen(in));
  45         close(fw1);
  46         wait(&status);
  47         n = read(fr2, out, outlen);
  48         out[n] = 0;
  49         close(fr2);
  50         return (n);
  51 }