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800d775e | 1 | /* |
a7ab6ec8 | 2 | * Copyright (c) 2010, Oracle America, Inc. |
cb636bb2 | 3 | * |
a7ab6ec8 UD |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions are | |
6 | * met: | |
800d775e | 7 | * |
a7ab6ec8 UD |
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. | |
800d775e | 17 | * |
a7ab6ec8 UD |
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. | |
800d775e UD |
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 | ||
3ce1f295 | 44 | #include <libio/iolibio.h> |
d18ea0c5 AS |
45 | #define fflush(s) _IO_fflush (s) |
46 | #define __fdopen(fd,m) _IO_fdopen (fd,m) | |
50304ef0 | 47 | |
800d775e UD |
48 | /* |
49 | * returns pid, or -1 for failure | |
50 | */ | |
51 | int | |
c4563d2d | 52 | _openchild (const char *command, FILE ** fto, FILE ** ffrom) |
800d775e UD |
53 | { |
54 | int i; | |
55 | int pid; | |
56 | int pdto[2]; | |
57 | int pdfrom[2]; | |
800d775e | 58 | |
50304ef0 | 59 | if (__pipe (pdto) < 0) |
800d775e | 60 | goto error1; |
50304ef0 | 61 | if (__pipe (pdfrom) < 0) |
800d775e | 62 | goto error2; |
50304ef0 | 63 | switch (pid = __fork ()) |
800d775e UD |
64 | { |
65 | case -1: | |
66 | goto error3; | |
67 | ||
68 | case 0: | |
69 | /* | |
70 | * child: read from pdto[0], write into pdfrom[1] | |
71 | */ | |
50304ef0 UD |
72 | __close (0); |
73 | __dup (pdto[0]); | |
74 | __close (1); | |
75 | __dup (pdfrom[1]); | |
9a0a462c | 76 | fflush (stderr); |
800d775e | 77 | for (i = _rpc_dtablesize () - 1; i >= 3; i--) |
50304ef0 | 78 | __close (i); |
9a0a462c | 79 | fflush (stderr); |
8d33466f | 80 | execlp (command, command, NULL); |
9a0a462c | 81 | perror ("exec"); |
800d775e UD |
82 | _exit (~0); |
83 | ||
84 | default: | |
85 | /* | |
86 | * parent: write into pdto[1], read from pdfrom[0] | |
87 | */ | |
7ce241a0 | 88 | *fto = __fdopen (pdto[1], "w"); |
50304ef0 | 89 | __close (pdto[0]); |
7ce241a0 | 90 | *ffrom = __fdopen (pdfrom[0], "r"); |
50304ef0 | 91 | __close (pdfrom[1]); |
800d775e UD |
92 | break; |
93 | } | |
94 | return pid; | |
95 | ||
96 | /* | |
97 | * error cleanup and return | |
98 | */ | |
99 | error3: | |
50304ef0 UD |
100 | __close (pdfrom[0]); |
101 | __close (pdfrom[1]); | |
800d775e | 102 | error2: |
50304ef0 UD |
103 | __close (pdto[0]); |
104 | __close (pdto[1]); | |
800d775e UD |
105 | error1: |
106 | return -1; | |
107 | } |