1 | /* |
2 | * Copyright (c) 2010, Oracle America, Inc. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions are |
6 | * met: |
7 | * |
8 | * * Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * * Redistributions in binary form must reproduce the above |
11 | * copyright notice, this list of conditions and the following |
12 | * disclaimer in the documentation and/or other materials |
13 | * provided with the distribution. |
14 | * * Neither the name of the "Oracle America, Inc." nor the names of its |
15 | * contributors may be used to endorse or promote products derived |
16 | * from this software without specific prior written permission. |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
22 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
23 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
25 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
27 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /* |
33 | * Open two pipes to a child process, one for reading, one for writing. |
34 | * The pipes are accessed by FILE pointers. This is NOT a public |
35 | * interface, but for internal use only! |
36 | */ |
37 | #include <stdio.h> |
38 | #include <stdlib.h> |
39 | #include <unistd.h> |
40 | #include <string.h> |
41 | #include <rpc/rpc.h> |
42 | #include <rpc/clnt.h> |
43 | |
44 | #include <libio/iolibio.h> |
45 | #define fflush(s) _IO_fflush (s) |
46 | #define __fdopen(fd,m) _IO_fdopen (fd,m) |
47 | |
48 | /* |
49 | * returns pid, or -1 for failure |
50 | */ |
51 | int |
52 | _openchild (const char *command, FILE ** fto, FILE ** ffrom) |
53 | { |
54 | int i; |
55 | int pid; |
56 | int pdto[2]; |
57 | int pdfrom[2]; |
58 | |
59 | if (__pipe (pdto) < 0) |
60 | goto error1; |
61 | if (__pipe (pdfrom) < 0) |
62 | goto error2; |
63 | switch (pid = __fork ()) |
64 | { |
65 | case -1: |
66 | goto error3; |
67 | |
68 | case 0: |
69 | /* |
70 | * child: read from pdto[0], write into pdfrom[1] |
71 | */ |
72 | __close (0); |
73 | __dup (pdto[0]); |
74 | __close (1); |
75 | __dup (pdfrom[1]); |
76 | fflush (stderr); |
77 | for (i = _rpc_dtablesize () - 1; i >= 3; i--) |
78 | __close (i); |
79 | fflush (stderr); |
80 | execlp (command, command, NULL); |
81 | perror ("exec" ); |
82 | _exit (~0); |
83 | |
84 | default: |
85 | /* |
86 | * parent: write into pdto[1], read from pdfrom[0] |
87 | */ |
88 | *fto = __fdopen (pdto[1], "w" ); |
89 | __close (pdto[0]); |
90 | *ffrom = __fdopen (pdfrom[0], "r" ); |
91 | __close (pdfrom[1]); |
92 | break; |
93 | } |
94 | return pid; |
95 | |
96 | /* |
97 | * error cleanup and return |
98 | */ |
99 | error3: |
100 | __close (pdfrom[0]); |
101 | __close (pdfrom[1]); |
102 | error2: |
103 | __close (pdto[0]); |
104 | __close (pdto[1]); |
105 | error1: |
106 | return -1; |
107 | } |
108 | |