upstream/1.1.0_cvsrelease/1.1.0_cvs

1 files changed, 167 insertions, 0 deletions

diff --git a/usr.sbin/cron/popen.c b/usr.sbin/cron/popen.c
new file mode 100644
index 000000000000..f890596a2f84
--- /dev/null
+++ b/usr.sbin/cron/popen.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software written by Ken Arnold and
+ * published in UNIX Review, Vol. 6, No. 8.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * From Id: popen.c,v 1.5 1994/01/15 20:43:43 vixie Exp
+ */
+
+/* this came out of the ftpd sources; it's been modified to avoid the
+ * globbing stuff since we don't need it.  also execvp instead of execv.
+ */
+
+#ifndef lint
+static char rcsid[] = "$Header: /home/cvs/386BSD/src/usr.sbin/cron/popen.c,v 1.1 1994/01/22 20:39:09 guido Exp $";
+static char sccsid[] = "@(#)popen.c	5.7 (Berkeley) 2/14/89";
+#endif /* not lint */
+
+#include "cron.h"
+#include <sys/signal.h>
+
+
+#define WANT_GLOBBING 0
+
+/*
+ * Special version of popen which avoids call to shell.  This insures noone
+ * may create a pipe to a hidden program as a side effect of a list or dir
+ * command.
+ */
+static PID_T *pids;
+static int fds;
+
+FILE *
+cron_popen(program, type)
+	char *program, *type;
+{
+	register char *cp;
+	FILE *iop;
+	int argc, pdes[2];
+	PID_T pid;
+	char *argv[100];
+#if WANT_GLOBBING
+	char **pop, *vv[2];
+	int gargc;
+	char *gargv[1000];
+	extern char **glob(), **copyblk();
+#endif
+
+	if (*type != 'r' && *type != 'w' || type[1])
+		return(NULL);
+
+	if (!pids) {
+		if ((fds = getdtablesize()) <= 0)
+			return(NULL);
+		if (!(pids = (PID_T *)malloc((u_int)(fds * sizeof(PID_T)))))
+			return(NULL);
+		bzero((char *)pids, fds * sizeof(PID_T));
+	}
+	if (pipe(pdes) < 0)
+		return(NULL);
+
+	/* break up string into pieces */
+	for (argc = 0, cp = program;; cp = NULL)
+		if (!(argv[argc++] = strtok(cp, " \t\n")))
+			break;
+
+#if WANT_GLOBBING
+	/* glob each piece */
+	gargv[0] = argv[0];
+	for (gargc = argc = 1; argv[argc]; argc++) {
+		if (!(pop = glob(argv[argc]))) {	/* globbing failed */
+			vv[0] = argv[argc];
+			vv[1] = NULL;
+			pop = copyblk(vv);
+		}
+		argv[argc] = (char *)pop;		/* save to free later */
+		while (*pop && gargc < 1000)
+			gargv[gargc++] = *pop++;
+	}
+	gargv[gargc] = NULL;
+#endif
+
+	iop = NULL;
+	switch(pid = vfork()) {
+	case -1:			/* error */
+		(void)close(pdes[0]);
+		(void)close(pdes[1]);
+		goto pfree;
+		/* NOTREACHED */
+	case 0:				/* child */
+		if (*type == 'r') {
+			if (pdes[1] != 1) {
+				dup2(pdes[1], 1);
+				dup2(pdes[1], 2);	/* stderr, too! */
+				(void)close(pdes[1]);
+			}
+			(void)close(pdes[0]);
+		} else {
+			if (pdes[0] != 0) {
+				dup2(pdes[0], 0);
+				(void)close(pdes[0]);
+			}
+			(void)close(pdes[1]);
+		}
+#if WANT_GLOBBING
+		execvp(gargv[0], gargv);
+#else
+		execvp(argv[0], argv);
+#endif
+		_exit(1);
+	}
+	/* parent; assume fdopen can't fail...  */
+	if (*type == 'r') {
+		iop = fdopen(pdes[0], type);
+		(void)close(pdes[1]);
+	} else {
+		iop = fdopen(pdes[1], type);
+		(void)close(pdes[0]);
+	}
+	pids[fileno(iop)] = pid;
+
+pfree:
+#if WANT_GLOBBING
+	for (argc = 1; argv[argc] != NULL; argc++) {
+/*		blkfree((char **)argv[argc]);	*/
+		free((char *)argv[argc]);
+	}
+#endif
+	return(iop);
+}
+
+int
+cron_pclose(iop)
+	FILE *iop;
+{
+	register int fdes;
+	int omask;
+	WAIT_T stat_loc;
+	PID_T pid;
+
+	/*
+	 * pclose returns -1 if stream is not associated with a
+	 * `popened' command, or, if already `pclosed'.
+	 */
+	if (pids == 0 || pids[fdes = fileno(iop)] == 0)
+		return(-1);
+	(void)fclose(iop);
+	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
+	while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
+		;
+	(void)sigsetmask(omask);
+	pids[fdes] = 0;
+	return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
+}