146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/* $NetBSD: popen.c,v 1.6 1998/01/31 15:07:14 christos Exp $ */
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/*
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* Copyright (c) 1988 The Regents of the University of California.
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* 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 are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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 1.6 1998/01/31 15:07:14 christos 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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