142 lines
2.9 KiB
C
Executable File
142 lines
2.9 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)openchild.c 1.4 92/07/14 SMI" /* SVr4.0 1.3 */
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/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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* PROPRIETARY NOTICE (Combined)
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*
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* This source code is unpublished proprietary information
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* constituting, or derived under license from AT&T's UNIX(r) System V.
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* In addition, portions of such source code were derived from Berkeley
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* 4.3 BSD under license from the Regents of the University of
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* California.
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*
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*
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*
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* Copyright Notice
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*
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* Notice of copyright on this source code product does not indicate
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* publication.
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*
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* (c) 1986,1987,1988,1989,1990 Sun Microsystems, Inc
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* (c) 1983,1984,1985,1986,1987,1988,1989 AT&T.
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* All rights reserved.
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)openchild.c 1.7 88/02/08 Copyr 1986 Sun Micro";
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#endif
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/*
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* openchild.c
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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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extern void *malloc();
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extern char *strrchr();
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static char *basename();
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static char SHELL[] = "/bin/sh";
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extern int close();
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extern int dup();
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extern int execl();
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extern void exit();
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extern long fork();
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extern int pipe();
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extern unsigned int strlen();
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/*
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* returns pid, or -1 for failure
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*/
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_openchild(command, fto, ffrom)
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char *command;
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FILE **fto;
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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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char *com;
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if (pipe(pdto) < 0) {
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goto error1;
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}
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if (pipe(pdfrom) < 0) {
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goto error2;
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}
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switch (pid = fork()) {
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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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(void) close(0);
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(void) dup(pdto[0]);
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(void) close(1);
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(void) dup(pdfrom[1]);
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for (i = _NFILE - 1; i >= 3; i--) {
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(void) close(i);
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}
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com = malloc((unsigned) strlen(command) + 6);
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if (com == NULL) {
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exit(1);
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}
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(void) sprintf(com, "exec %s", command);
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execl(SHELL, basename(SHELL), "-c", com, NULL);
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exit(1);
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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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(void) close(pdto[0]);
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*ffrom = fdopen(pdfrom[0], "r");
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(void) 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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printf("openchild: error3");
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(void) close(pdfrom[0]);
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(void) close(pdfrom[1]);
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error2:
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printf("openchild: error2");
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(void) close(pdto[0]);
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(void) close(pdto[1]);
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error1:
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printf("openchild: error1");
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return (-1);
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}
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static char *
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basename(path)
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char *path;
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{
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char *p;
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p = strrchr(path, '/');
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if (p == NULL) {
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return (path);
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} else {
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return (p + 1);
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}
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}
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