fixed bugs where sub processes would become zombies because the master process did not catch SIGCHLD

CHANGES

@@ -16,6 +16,12 @@ corrections:
 	fix: replaced FOPEN_MAX with FD_SETSIZE
 	thanks to Daniel Lucq for reporting this problem.
 
+	fixed bugs where sub processes would become zombies because the master
+	process did not catch SIGCHLD. this affected addresses UDP-LISTEN,
+	UDP-CONNECT, TCP-CONNECT, OPENSSL, PROXY, UNIX-CONNECT, UNIX-CLIENT,
+	ABSTRACT-CONNECT, ABSTRACT-CLIENT, SOCKSA, SOCKS4A
+	(thanks to Fernanda G Weiden for reporting this problem)
+
 	corrected some print statements and variable names
 
 	make uninstall  did not uninstall procan

VERSION

@@ -1 +1 @@
-"1.6.0.0+execpty+servres+fd_setsize"
+"1.6.0.0+execpty+servres+fd_setsize+udp_sigchld1"

test.sh

@@ -7979,6 +7979,56 @@ esac
 N=$((N+1))
 
 
+# there was a bug with udp-listen and fork: terminating sub processes became
+# zombies because the master process did not catch SIGCHLD
+NAME=UDP4LISTEN_SIGCHLD
+case "$TESTS" in
+*%functions%*|*%ip4%*|*%ipapp%*|*%udp%*|*%$NAME%*)
+TEST="$NAME: test if UDP4-LISTEN child becomes zombie"
+# idea: run a udp-listen process with fork and -T. Connect once, so a sub
+# process is forked off. Make some transfer and wait until the -T timeout is
+# over. Now check for the child process: if it is zombie the test failed. 
+# Correct is that child process terminated
+tf="$td/test$N.stdout"
+te="$td/test$N.stderr"
+tdiff="$td/test$N.diff"
+tsl=$PORT
+ts="$LOCALHOST:$tsl"
+da=$(date)
+CMD1="$SOCAT $opts -T 0.5 UDP4-LISTEN:$tsl,reuseaddr,fork PIPE"
+CMD2="$SOCAT $opts - UDP4:$ts"
+printf "test $F_n $TEST... " $N
+$CMD1 >"$tf" 2>"${te}1" &
+pid1=$!
+waitudp4port $tsl 1
+echo "$da" |$CMD2 >>"$tf" 2>>"${te}2"
+rc2=$?
+sleep 1
+#read -p ">"
+l="$(childprocess $pid1)"
+kill $pid1 2>/dev/null; wait
+if [ $rc2 -ne 0 ]; then
+    $PRINTF "$NO_RESULT\n"	# already handled in test UDP4STREAM
+    numCANT=$((numCANT+1))
+elif ! echo "$da" |diff - "$tf" >"$tdiff"; then
+    $PRINTF "$NO_RESULT\n"	# already handled in test UDP4STREAM
+    numCANT=$((numCANT+1))
+elif $(isdefunct "$l"); then
+    $PRINTF "$FAILED: $SOCAT:\n"
+    echo "$CMD1 &"
+    echo "$CMD2"
+    cat "${te}1" "${te}2"
+    numFAIL=$((numFAIL+1))
+else
+    $PRINTF "$OK\n"
+    if [ -n "$debug" ]; then cat "${te}1" "${te}2"; fi
+    numOK=$((numOK+1))
+fi ;;
+esac
+PORT=$((PORT+1))
+N=$((N+1))
+
+
 echo "summary: $((N-1)) tests; $numOK ok, $numFAIL failed, $numCANT could not be performed"
 
 if [ "$numFAIL" -gt 0 ]; then

xio-ipapp.c

@@ -1,5 +1,5 @@
 /* source: xio-ipapp.c */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for TCP and UDP related options */
@@ -57,6 +57,10 @@ int xioopen_ipapp_connect(int argc, const char *argv[], struct opt *opts,
       return STAT_NORETRY;
    }
 
+   if (dofork) {
+      xiosetchilddied();	/* set SIGCHLD handler */
+   }
+
    if (xioopts.logopt == 'm') {
       Info("starting connect loop, switching to syslog");
       diag_set('y', xioopts.syslogfac);  xioopts.logopt = 'y';

xio-listen.c

@@ -1,5 +1,5 @@
 /* source: xio-listen.c */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for listen socket options */
@@ -115,28 +115,9 @@ int _xioopen_listen(struct single *xfd, int xioflags, struct sockaddr *us, sockl
 
    if (applyopts_single(xfd, opts, PH_INIT) < 0)  return -1;
 
-#if 1
    if (dofork) {
-#if HAVE_SIGACTION
+      xiosetchilddied();	/* set SIGCHLD handler */
-      struct sigaction act;
-      memset(&act, 0, sizeof(struct sigaction));
-      act.sa_flags   = SA_NOCLDSTOP|SA_RESTART
-#ifdef SA_NOMASK
-	 |SA_NOMASK
-#endif
-	 ;
-      act.sa_handler = childdied;
-      if (Sigaction(SIGCHLD, &act, NULL) < 0) {
-	 /*! man does not say that errno is defined */
-	 Warn2("sigaction(SIGCHLD, %p, NULL): %s", childdied, strerror(errno));
    }
-#else /* HAVE_SIGACTION */
-      if (Signal(SIGCHLD, childdied) == SIG_ERR) {
-	 Warn2("signal(SIGCHLD, %p): %s", childdied, strerror(errno));
-      }
-#endif /* !HAVE_SIGACTION */
-   }
-#endif /* 1 */
 
    if ((xfd->fd = Socket(pf, socktype, proto)) < 0) {
       Msg4(level,

xio-openssl.c

@@ -1,5 +1,5 @@
 /* source: xio-openssl.c */
-/* Copyright Gerhard Rieger 2002-2007 */
+/* Copyright Gerhard Rieger 2002-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the implementation of the openssl addresses */
@@ -268,6 +268,10 @@ static int
       default: return STAT_NORETRY;
       }
 
+      if (dofork) {
+	 xiosetchilddied();	/* set SIGCHLD handler */
+      }
+
 #if WITH_RETRY
       if (dofork) {
 	 pid_t pid;

xio-progcall.c

@@ -399,9 +399,8 @@ int _xioopen_foxec(int xioflags,	/* XIO_RDONLY etc. */
    /*0   if ((optpr = copyopts(*copts, GROUP_PROCESS)) == NULL)
      return STAT_RETRYLATER;*/
    retropt_bool(*copts, OPT_STDERR, &withstderr);
-   if (Signal(SIGCHLD, childdied) == SIG_ERR) {
+
-      Warn2("signal(SIGCHLD, %p): %s", childdied, strerror(errno));
+   xiosetchilddied();	/* set SIGCHLD handler */
-   }
 
    if (withfork) {
       const char *forkwaitstring;

xio-proxy.c

@@ -1,5 +1,5 @@
 /* source: xio-proxy.c */
-/* Copyright Gerhard Rieger 2002-2006 */
+/* Copyright Gerhard Rieger 2002-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of HTTP proxy CONNECT
@@ -185,6 +185,10 @@ static int xioopen_proxy_connect(int argc, const char *argv[], struct opt *opts,
 	 return result;
       }
 
+      if (dofork) {
+	 xiosetchilddied();	/* set SIGCHLD handler */
+      }
+
 #if WITH_RETRY
       if (dofork) {
 	 pid_t pid;

xio-socket.c

@@ -1,5 +1,5 @@
 /* source: xio-socket.c */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for socket related functions */
@@ -401,6 +401,10 @@ int xioopen_connect(struct single *xfd, struct sockaddr *us, size_t uslen,
 	 return result;
       }
 
+      if (dofork) {
+	 xiosetchilddied();	/* set SIGCHLD handler */
+      }
+
 #if WITH_RETRY
       if (dofork) {
 	 pid_t pid;
@@ -554,29 +558,6 @@ int _xioopen_dgram_recvfrom(struct single *xfd, int xioflags,
 
    if (applyopts_single(xfd, opts, PH_INIT) < 0)  return STAT_NORETRY;
 
-#if 1
-   if (dofork) {
-#if HAVE_SIGACTION
-      struct sigaction act;
-      memset(&act, 0, sizeof(struct sigaction));
-      act.sa_flags   = SA_NOCLDSTOP|SA_RESTART
-#ifdef SA_NOMASK
-	 |SA_NOMASK
-#endif
-	 ;
-      act.sa_handler = childdied;
-      if (Sigaction(SIGCHLD, &act, NULL) < 0) {
-	 /*! man does not say that errno is defined */
-	 Warn2("sigaction(SIGCHLD, %p, NULL): %s", childdied, strerror(errno));
-      }
-#else /* HAVE_SIGACTION */
-      if (Signal(SIGCHLD, childdied) == SIG_ERR) {
-	 Warn2("signal(SIGCHLD, %p): %s", childdied, strerror(errno));
-      }
-#endif /* !HAVE_SIGACTION */
-   }
-#endif /* 1 */
-
    if ((xfd->fd = Socket(pf, socktype, proto)) < 0) {
       Msg4(level,
 	   "socket(%d, %d, %d): %s", pf, socktype, proto, strerror(errno));

xio-socks.c

@@ -1,5 +1,5 @@
 /* source: xio-socks.c */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for opening addresses of socks4 type */
@@ -163,6 +163,10 @@ static int xioopen_socks4_connect(int argc, const char *argv[], struct opt *opts
 	 return result;
       }
 
+      if (dofork) {
+	 xiosetchilddied();	/* set SIGCHLD handler */
+      }
+
 #if WITH_RETRY
       if (dofork) {
 	 pid_t pid;

xio-udp.c

@@ -1,5 +1,5 @@
 /* source: xio-udp.c */
-/* Copyright Gerhard Rieger 2001-2007 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this file contains the source for handling UDP addresses */
@@ -164,6 +164,10 @@ int xioopen_ipdgram_listen(int argc, const char *argv[], struct opt *opts,
    }
    retropt_bool(opts, OPT_LOWPORT, &fd->stream.para.socket.ip.lowport);
 
+   if (dofork) {
+      xiosetchilddied();	/* set SIGCHLD handler */
+   }
+
    while (true) {	/* we loop with fork or prohibited packets */
       /* now wait for some packet on this datagram socket, get its sender
 	 address, connect there, and return */

xio.h

@@ -388,6 +388,7 @@ extern pid_t diedunknown3;
 extern pid_t diedunknown4;
 
 extern int xiosetsigchild(xiofile_t *xfd, int (*callback)(struct single *));
+extern int xiosetchilddied(void);
 extern int xio_opt_signal(pid_t pid, int signum);
 extern void childdied(int signum);
 

xiosigchld.c

@@ -1,5 +1,5 @@
 /* source: xiosigchld.c */
-/* Copyright Gerhard Rieger 2001-2006 */
+/* Copyright Gerhard Rieger 2001-2008 */
 /* Published under the GNU General Public License V.2, see file COPYING */
 
 /* this is the source of the extended child signal handler */
@@ -157,3 +157,26 @@ void childdied(int signum) {
    Info("childdied() finished");
    errno = _errno;
 }
+
+
+int xiosetchilddied(void) {
+#if HAVE_SIGACTION
+   struct sigaction act;
+   memset(&act, 0, sizeof(struct sigaction));
+   act.sa_flags   = SA_NOCLDSTOP|SA_RESTART
+#ifdef SA_NOMASK
+      |SA_NOMASK
+#endif
+      ;
+   act.sa_handler = childdied;
+   if (Sigaction(SIGCHLD, &act, NULL) < 0) {
+      /*! man does not say that errno is defined */
+      Warn2("sigaction(SIGCHLD, %p, NULL): %s", childdied, strerror(errno));
+   }
+#else /* HAVE_SIGACTION */
+   if (Signal(SIGCHLD, childdied) == SIG_ERR) {
+      Warn2("signal(SIGCHLD, %p): %s", childdied, strerror(errno));
+   }
+#endif /* !HAVE_SIGACTION */
+   return 0;
+}