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Add a timeout flag so that failing operations can at least be caught

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and flagged.  Closes PR#1513
Submitted-By: David Muir Sharnoff <muir@idiom.com>
This commit is contained in:
Jordan K. Hubbard 1996-09-06 05:24:05 +00:00
parent d4b2a43950
commit 619c58eea0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18067
2 changed files with 33 additions and 9 deletions
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6
usr.bin/rsh/rsh.1
View File

@ -40,6 +40,7 @@
.Sh SYNOPSIS
.Nm rsh
.Op Fl Kdnx
.Op Fl t Ar timeout
.Op Fl k Ar realm
.Op Fl l Ar username
.Ar host
@ -105,6 +106,11 @@ option turns on
.Tn DES
encryption for all data exchange.
This may introduce a significant delay in response time.
.It Fl t
The
.Fl t
option allows a timeout to be specified (in seconds). If no
data is sent or received in this time, rsh will exit.
.El
.Pp
If no

36
usr.bin/rsh/rsh.c
View File

@ -40,7 +40,7 @@ static char copyright[] =
#ifndef lint
static char sccsid[] = "From: @(#)rsh.c 8.3 (Berkeley) 4/6/94";
static char rcsid[] =
"$Id: rsh.c,v 1.6 1996/02/03 11:49:29 markm Exp $";
"$Id: rsh.c,v 1.7 1996/02/11 09:14:12 markm Exp $";
#endif /* not lint */
#include <sys/types.h>
@ -48,6 +48,7 @@ static char rcsid[] =
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
@ -82,7 +83,7 @@ int rfd2;
char *copyargs __P((char **));
void sendsig __P((int));
void talk __P((int, long, pid_t, int));
void talk __P((int, long, pid_t, int, int));
void usage __P((void));
void warning __P(());
@ -98,6 +99,7 @@ main(argc, argv)
pid_t pid;
uid_t uid;
char *args, *host, *p, *user;
int timeout = 0;
argoff = asrsh = dflag = nflag = 0;
one = 1;
@ -121,12 +123,12 @@ main(argc, argv)
#ifdef KERBEROS
#ifdef CRYPT
#define OPTIONS "8KLde:k:l:nwx"
#define OPTIONS "8KLde:k:l:nt:wx"
#else
#define OPTIONS "8KLde:k:l:nw"
#define OPTIONS "8KLde:k:l:nt:w"
#endif
#else
#define OPTIONS "8KLde:l:nw"
#define OPTIONS "8KLde:l:nt:w"
#endif
while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
switch(ch) {
@ -162,6 +164,9 @@ main(argc, argv)
break;
#endif
#endif
case 't':
timeout = atoi(optarg);
break;
case '?':
default:
usage();
@ -297,7 +302,7 @@ main(argc, argv)
(void)ioctl(rem, FIONBIO, &one);
}
talk(nflag, omask, pid, rem);
talk(nflag, omask, pid, rem, timeout);
if (!nflag)
(void)kill(pid, SIGKILL);
@ -305,7 +310,7 @@ main(argc, argv)
}
void
talk(nflag, omask, pid, rem)
talk(nflag, omask, pid, rem, timeout)
int nflag;
long omask;
pid_t pid;
@ -314,6 +319,8 @@ talk(nflag, omask, pid, rem)
int cc, wc;
fd_set readfrom, ready, rembits;
char *bp, buf[BUFSIZ];
struct timeval tvtimeout;
int srval;
if (!nflag && pid == 0) {
(void)close(rfd2);
@ -356,17 +363,28 @@ reread: errno = 0;
exit(0);
}
tvtimeout.tv_sec = timeout;
tvtimeout.tv_usec = 0;
(void)sigsetmask(omask);
FD_ZERO(&readfrom);
FD_SET(rfd2, &readfrom);
FD_SET(rem, &readfrom);
do {
ready = readfrom;
if (select(16, &ready, 0, 0, 0) < 0) {
if (timeout) {
srval = select(16, &ready, 0, 0, &tvtimeout);
} else {
srval = select(16, &ready, 0, 0, 0);
}
if (srval < 0) {
if (errno != EINTR)
err(1, "select");
continue;
}
if (srval == 0)
errx(1, "timeout reached (%d seconds)\n", timeout);
if (FD_ISSET(rfd2, &ready)) {
errno = 0;
#ifdef KERBEROS
@ -463,7 +481,7 @@ usage()
{
(void)fprintf(stderr,
"usage: rsh [-nd%s]%s[-l login] host [command]\n",
"usage: rsh [-nd%s]%s[-l login] [-t timeout] host [command]\n",
#ifdef KERBEROS
#ifdef CRYPT
"x", " [-k realm] ");