Once again change RPC copyright notices.
[glibc.git] / sunrpc / openchild.c
blob18c7d105d8e515bb6b1afb84958ce0724e7dc318
1 /*
2 * Copyright (c) 2010, Oracle America, Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
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.
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.
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!
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>
44 #ifdef USE_IN_LIBIO
45 # include <libio/iolibio.h>
46 # define fflush(s) INTUSE(_IO_fflush) (s)
47 # define __fdopen(fd,m) INTUSE(_IO_fdopen) (fd,m)
48 #endif
51 * returns pid, or -1 for failure
53 int
54 _openchild (const char *command, FILE ** fto, FILE ** ffrom)
56 int i;
57 int pid;
58 int pdto[2];
59 int pdfrom[2];
61 if (__pipe (pdto) < 0)
62 goto error1;
63 if (__pipe (pdfrom) < 0)
64 goto error2;
65 switch (pid = __fork ())
67 case -1:
68 goto error3;
70 case 0:
72 * child: read from pdto[0], write into pdfrom[1]
74 __close (0);
75 __dup (pdto[0]);
76 __close (1);
77 __dup (pdfrom[1]);
78 fflush (stderr);
79 for (i = _rpc_dtablesize () - 1; i >= 3; i--)
80 __close (i);
81 fflush (stderr);
82 execlp (command, command, NULL);
83 perror ("exec");
84 _exit (~0);
86 default:
88 * parent: write into pdto[1], read from pdfrom[0]
90 *fto = __fdopen (pdto[1], "w");
91 __close (pdto[0]);
92 *ffrom = __fdopen (pdfrom[0], "r");
93 __close (pdfrom[1]);
94 break;
96 return pid;
99 * error cleanup and return
101 error3:
102 __close (pdfrom[0]);
103 __close (pdfrom[1]);
104 error2:
105 __close (pdto[0]);
106 __close (pdto[1]);
107 error1:
108 return -1;