Improve the "-d" and "-d -d" facilities.

When we close a CLI and it had fd# 0 and/or fd#1, reopen these
as /dev/null so the will not be reused for the CLI pipe to the
child on next restart, otherwise stdout/stderr output from the
manager would get sent there and confuse the clients CLI reader.

Don't double free a pointer to the CLI buffer.

Accept non-zero results from cli_readres() errors are non-fatal.

Use stderr more consistently for manager debugging.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@749 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/mgt_child.c

@@ -67,7 +67,7 @@ child_listener(struct ev *e, int what)
 		return (1);
 	}
 	buf[i] = '\0';
-	printf("Child said (%d, %d): <<%s>>\n", child_state, child_pid, buf);
+	fprintf(stderr, "Child said (%d, %d): <<%s>>\n", child_state, child_pid, buf);
 	return (0);
 }
 
@@ -128,7 +128,7 @@ start_child(void)
 		exit (1);
 	}
 
-	printf("start child pid %d\n", i);
+	fprintf(stderr, "start child pid %d\n", i);
 
 	AZ(close(child_fds[1]));
 	child_fds[1] = -1;
@@ -183,7 +183,7 @@ stop_child(void)
 	}
 	ev_poker = NULL;
 
-	printf("Clean child\n");
+	fprintf(stderr, "Clean child\n");
 	mgt_cli_stop_child();
 
 	/* We tell the child to die gracefully by closing the CLI */
@@ -192,7 +192,7 @@ stop_child(void)
 	AZ(close(heritage.fds[3]));
 	heritage.fds[3] = -1;
 
-	printf("Child stopping\n");
+	fprintf(stderr, "Child stopping\n");
 }
 
 /*--------------------------------------------------------------------*/
@@ -214,16 +214,16 @@ mgt_sigchld(struct ev *e, int what)
 
 	r = wait4(-1, &status, WNOHANG, NULL);
 	if (r != child_pid) {
-		printf("Unknown child died pid=%d status=0x%x\n",
+		fprintf(stderr, "Unknown child died pid=%d status=0x%x\n",
 		    r, status);
 		return (0);
 	}
-	printf("Cache child died pid=%d status=0x%x\n", r, status);
+	fprintf(stderr, "Cache child died pid=%d status=0x%x\n", r, status);
 	child_pid = -1;
 
 	if (child_state == CH_RUNNING) {
 		child_state = CH_DIED;
-		printf("Clean child\n");
+		fprintf(stderr, "Clean child\n");
 		mgt_cli_stop_child();
 
 		/* We tell the child to die gracefully by closing the CLI */
@@ -241,7 +241,7 @@ mgt_sigchld(struct ev *e, int what)
 
 	AZ(close(child_fds[0]));
 	child_fds[0] = -1;
-	printf("Child cleaned\n");
+	fprintf(stderr, "Child cleaned\n");
 
 	if (child_state == CH_DIED)
 		start_child();
@@ -258,7 +258,7 @@ mgt_sigint(struct ev *e, int what)
 
 	(void)e;
 	(void)what;
-	printf("Manager got SIGINT\n");
+	fprintf(stderr, "Manager got SIGINT\n");
 	fflush(stdout);
 	if (child_pid >= 0)
 		stop_child();
@@ -276,6 +276,7 @@ mgt_run(int dflag)
 {
 	struct sigaction sac;
 	struct ev *e;
+	int i;
 
 	mgt_pid = getpid();
 
@@ -320,9 +321,10 @@ mgt_run(int dflag)
 	if (!dflag)
 		start_child();
 
-	ev_schedule(mgt_evb);
+	i = ev_schedule(mgt_evb);
+	fprintf(stderr, "ev_schedule = %d\n", i);
 
-	printf("manager dies\n");
+	fprintf(stderr, "manager dies\n");
 	exit(2);
 }
 

bin/varnishd/mgt_cli.c

@@ -8,6 +8,7 @@
 
 #include <stdarg.h>
 #include <stdio.h>
+#include <fcntl.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -189,7 +190,6 @@ mgt_cli_askchild(unsigned *status, char **resp, const char *fmt, ...)
 	j = write(cli_o, p, i);
 	free(p);
 	if (j != i) {
-		free(p);
 		if (status != NULL)
 			*status = CLIS_COMMS;
 		if (resp != NULL)
@@ -198,7 +198,6 @@ mgt_cli_askchild(unsigned *status, char **resp, const char *fmt, ...)
 	}
 
 	i = cli_readres(cli_i, &u, resp, 3.0);
-	assert(i == 0);
 	if (status != NULL)
 		*status = u;
 	return (u == CLIS_OK ? 0 : u);
@@ -281,7 +280,14 @@ fprintf(stderr, "CLI <%s>\n", cp->buf);
 	vsb_delete(cp->cli->sb);
 	free(cp->buf);
 	close(cp->fdi);
+	if (cp->fdi == 0)
+		open("/dev/null", O_RDONLY);
 	close(cp->fdo);
+	if (cp->fdo == 1) {
+		close(2);
+		open("/dev/null", O_WRONLY);
+		open("/dev/null", O_WRONLY);
+	}
 	free(cp);
 	return (1);
 }

bin/varnishd/varnishd.c

@@ -403,10 +403,10 @@ main(int argc, char *argv[])
 
 	if (dflag == 1)
 		DebugStunt();
-	if (dflag != 2)
+	if (dflag < 2)
 		daemon(dflag, dflag);
-	if (dflag)
-		printf("%d\n%d\n%d\n", getpid(), getsid(0), getpgrp());
+	if (dflag == 1)
+		printf("%d\n", getpid());
 
 	mgt_cli_init();