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/*
* 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>
#ifdef USE_IN_LIBIO
# include <libio/iolibio.h>
# define fflush(s) _IO_fflush (s)
# define __fdopen(fd,m) _IO_fdopen (fd,m)
#endif
/*
* returns pid, or -1 for failure
*/
int
_openchild (const char *command, FILE ** fto, FILE ** ffrom)
{
int i;
int pid;
int pdto[2];
int pdfrom[2];
if (__pipe (pdto) < 0)
goto error1;
if (__pipe (pdfrom) < 0)
goto error2;
switch (pid = __fork ())
{
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]);
fflush (stderr);
for (i = _rpc_dtablesize () - 1; i >= 3; i--)
__close (i);
fflush (stderr);
execlp (command, command, 0);
perror ("exec");
_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;
}
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