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 #include "refer..c"
16 #define move(x, y) close(y); dup(x); close(x);
17
18 extern void err();
19
20 int
corout(char * in,char * out,char * rprog,char * arg,int outlen)21 corout(char *in, char *out, char *rprog, char *arg, int outlen)
22 {
23 int pipev[2], fr1, fr2, fw1, fw2, n;
24 int status;
25
26 pipe(pipev);
27 fr1 = pipev[0];
28 fw1 = pipev[1];
29 pipe(pipev);
30 fr2 = pipev[0];
31 fw2 = pipev[1];
32 if (fork() == 0) {
33 close(fw1);
34 close(fr2);
35 move(fr1, 0);
36 move(fw2, 1);
37 execl(rprog, "deliv", arg, 0);
38 err("Can't run %s", rprog);
39 }
40 close(fw2);
41 close(fr1);
42 write(fw1, in, strlen(in));
43 close(fw1);
44 wait(&status);
45 n = read(fr2, out, outlen);
46 out[n] = 0;
47 close(fr2);
48 return (n);
49 }
50