1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)openchild.c 2.3 88/08/15 4.0 RPCSRC; from 1.7 88/02/08 SMI";
#endif
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/*
* Copyright (c) 1988 by Sun Microsystems, Inc.
*/
/*
* Open two pipes to a child process, one for reading, one for writing.
* The pipes are accessed by FILE pointers. This is NOT a public
* interface, but for internal use only!
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/clnt.h>
static char SHELL[] = "/bin/sh";
/*
* returns pid, or -1 for failure
*/
int
_openchild (char *command, FILE ** fto, FILE ** ffrom)
{
int i;
int pid;
int pdto[2];
int pdfrom[2];
char *com;
if (pipe (pdto) < 0)
goto error1;
if (pipe (pdfrom) < 0)
goto error2;
switch (pid = vfork ())
{
case -1:
goto error3;
case 0:
/*
* child: read from pdto[0], write into pdfrom[1]
*/
close (0);
dup (pdto[0]);
close (1);
dup (pdfrom[1]);
for (i = _rpc_dtablesize () - 1; i >= 3; i--)
close (i);
com = malloc (strlen (command) + 6);
if (com == NULL)
_exit (~0);
sprintf (com, "exec %s", command);
execl (SHELL, basename (SHELL), "-c", com, NULL);
_exit (~0);
default:
/*
* parent: write into pdto[1], read from pdfrom[0]
*/
*fto = fdopen (pdto[1], "w");
close (pdto[0]);
*ffrom = fdopen (pdfrom[0], "r");
close (pdfrom[1]);
break;
}
return pid;
/*
* error cleanup and return
*/
error3:
close (pdfrom[0]);
close (pdfrom[1]);
error2:
close (pdto[0]);
close (pdto[1]);
error1:
return -1;
}
|
