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108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Copyright (c) 2010, Oracle America, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Open two pipes to a child process, one for reading, one for writing.
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* The pipes are accessed by FILE pointers. This is NOT a public
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* interface, but for internal use only!
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <rpc/clnt.h>
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#include <libio/iolibio.h>
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#define fflush(s) _IO_fflush (s)
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#define __fdopen(fd,m) _IO_fdopen (fd,m)
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/*
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* returns pid, or -1 for failure
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*/
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int
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_openchild (const char *command, FILE ** fto, FILE ** ffrom)
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{
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int i;
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int pid;
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int pdto[2];
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int pdfrom[2];
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if (__pipe (pdto) < 0)
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goto error1;
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if (__pipe (pdfrom) < 0)
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goto error2;
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switch (pid = __fork ())
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{
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case -1:
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goto error3;
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case 0:
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/*
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* child: read from pdto[0], write into pdfrom[1]
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*/
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__close (0);
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__dup (pdto[0]);
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__close (1);
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__dup (pdfrom[1]);
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fflush (stderr);
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for (i = _rpc_dtablesize () - 1; i >= 3; i--)
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__close (i);
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fflush (stderr);
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execlp (command, command, NULL);
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perror ("exec");
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_exit (~0);
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default:
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/*
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* parent: write into pdto[1], read from pdfrom[0]
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*/
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*fto = __fdopen (pdto[1], "w");
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__close (pdto[0]);
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*ffrom = __fdopen (pdfrom[0], "r");
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__close (pdfrom[1]);
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break;
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}
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return pid;
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/*
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* error cleanup and return
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*/
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error3:
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__close (pdfrom[0]);
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__close (pdfrom[1]);
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error2:
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__close (pdto[0]);
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__close (pdto[1]);
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error1:
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return -1;
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}
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