155 lines
4.0 KiB
C
155 lines
4.0 KiB
C
/* $NetBSD: popen.c,v 1.8 2003/08/07 11:25:17 agc Exp $ */
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/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software written by Ken Arnold and
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* published in UNIX Review, Vol. 6, No. 8.
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char rcsid[] = "Id: popen.c,v 1.5 1994/01/15 20:43:43 vixie Exp";
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static char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89";
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#else
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__RCSID("$NetBSD: popen.c,v 1.8 2003/08/07 11:25:17 agc Exp $");
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#endif
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#endif /* not lint */
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#include "cron.h"
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#include <signal.h>
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/*
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* Special version of popen which avoids call to shell. This insures noone
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* may create a pipe to a hidden program as a side effect of a list or dir
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* command.
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*/
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static PID_T *pids;
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static int fds;
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#define MAX_ARGS 1024
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FILE *
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cron_popen(program, type)
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char *program, *type;
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{
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char *cp;
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FILE *iop;
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int argc, pdes[2];
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PID_T pid;
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char *argv[MAX_ARGS];
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#ifdef __GNUC__
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(void) &iop; /* Avoid vfork clobbering */
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#endif
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if ((*type != 'r' && *type != 'w') || type[1])
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return(NULL);
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if (!pids) {
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if ((fds = getdtablesize()) <= 0)
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return(NULL);
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if (!(pids = (PID_T *)malloc((u_int)(fds * sizeof(PID_T)))))
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return(NULL);
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bzero((char *)pids, fds * sizeof(PID_T));
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}
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if (pipe(pdes) < 0)
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return(NULL);
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/* break up string into pieces */
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for (argc = 0, cp = program; argc < MAX_ARGS; cp = NULL)
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if (!(argv[argc++] = strtok(cp, " \t\n")))
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break;
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iop = NULL;
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switch(pid = vfork()) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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goto pfree;
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/* NOTREACHED */
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case 0: /* child */
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if (*type == 'r') {
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if (pdes[1] != 1) {
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dup2(pdes[1], 1);
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dup2(pdes[1], 2); /* stderr, too! */
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(void)close(pdes[1]);
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}
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(void)close(pdes[0]);
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} else {
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if (pdes[0] != 0) {
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dup2(pdes[0], 0);
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(void)close(pdes[0]);
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}
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(void)close(pdes[1]);
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}
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execvp(argv[0], argv);
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_exit(1);
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}
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/* parent; assume fdopen can't fail... */
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if (*type == 'r') {
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iop = fdopen(pdes[0], type);
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(void)close(pdes[1]);
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} else {
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iop = fdopen(pdes[1], type);
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(void)close(pdes[0]);
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}
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pids[fileno(iop)] = pid;
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pfree:
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return(iop);
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}
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int
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cron_pclose(iop)
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FILE *iop;
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{
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int fdes;
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sigset_t oset, nset;
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WAIT_T stat_loc;
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PID_T pid;
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/*
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* pclose returns -1 if stream is not associated with a
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* `popened' command, or, if already `pclosed'.
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*/
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if (pids == 0 || pids[fdes = fileno(iop)] == 0)
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return(-1);
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(void)fclose(iop);
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sigemptyset(&nset);
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sigaddset(&nset, SIGINT);
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sigaddset(&nset, SIGQUIT);
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sigaddset(&nset, SIGHUP);
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(void)sigprocmask(SIG_BLOCK, &nset, &oset);
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while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
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;
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(void)sigprocmask(SIG_SETMASK, &oset, NULL);
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pids[fdes] = 0;
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return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
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}
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