simplify handling of environment variables for disabling backends;

make event_get_supported_methods obey environment variables; this
fixes make verify; problem reported by Scott Lamb.


svn:r838

ChangeLog

@@ -102,7 +102,8 @@ Changes in current version:
  o Fix connection keep-alive behavior for HTTP/1.0
  o Fix use of freed memory in event_reinit; pointed out by Peter Postma
  o constify struct timeval * where possible
-
+ o make event_get_supported_methods obey environment variables
+	
 Changes in 1.4.0:
  o allow \r or \n individually to separate HTTP headers instead of the standard "\r\n"; from Charles Kerr.
  o demote most http warnings to debug messages

devpoll.c

@@ -131,10 +131,6 @@ devpoll_init(struct event_base *base)
 	struct rlimit rl;
 	struct devpollop *devpollop;
 
-	/* Disable devpoll when this environment variable is set */
-	if (getenv("EVENT_NODEVPOLL"))
-		return (NULL);
-
 	if (!(devpollop = mm_calloc(1, sizeof(struct devpollop))))
 		return (NULL);
 

epoll.c

@@ -112,10 +112,6 @@ epoll_init(struct event_base *base)
 	struct rlimit rl;
 	struct epollop *epollop;
 
-	/* Disable epollueue when this environment variable is set */
-	if (getenv("EVENT_NOEPOLL"))
-		return (NULL);
-
 	if (getrlimit(RLIMIT_NOFILE, &rl) == 0 &&
 	    rl.rlim_cur != RLIM_INFINITY) {
 		/*

event.c

@@ -51,6 +51,7 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#include <ctype.h>
 #include <errno.h>
 #include <signal.h>
 #include <string.h>
@@ -208,6 +209,19 @@ event_config_is_avoided_method(struct event_config *cfg, const char *method)
 	return (0);
 }
 
+static int
+event_is_method_disabled(const char *name)
+{
+	char environment[64];
+	int i;
+
+	evutil_snprintf(environment, sizeof(environment), "EVENT_NO%s", name);
+	for (i = 8; environment[i] != '\0'; ++i)
+		environment[i] = toupper(environment[i]);
+	return (getenv(environment) != NULL);
+	
+}
+
 struct event_base *
 event_base_new_with_config(struct event_config *cfg)
 {
@@ -238,6 +252,10 @@ event_base_new_with_config(struct event_config *cfg)
 				continue;
 		}
 
+		/* also obey the environment variables */
+		if (event_is_method_disabled(eventops[i]->name))
+			continue;
+
 		base->evsel = eventops[i];
 
 		base->evbase = base->evsel->init(base);
@@ -247,8 +265,7 @@ event_base_new_with_config(struct event_config *cfg)
 		event_errx(1, "%s: no event mechanism available", __func__);
 
 	if (getenv("EVENT_SHOW_METHOD")) 
-		event_msgx("libevent using: %s\n",
-			   base->evsel->name);
+		event_msgx("libevent using: %s", base->evsel->name);
 
 	/* allocate a single active event queue */
 	event_base_priority_init(base, 1);
@@ -356,12 +373,12 @@ event_get_supported_methods(void)
 	const char **tmp;
 	int i = 0, k;
 
-	if (methods != NULL)
-		return (methods);
-
 	/* count all methods */
-	for (method = &eventops[0]; *method != NULL; ++method)
+	for (method = &eventops[0]; *method != NULL; ++method) {
+		if (event_is_method_disabled((*method)->name))
+			continue;
 		++i;
+	}
 
 	/* allocate one more than we need for the NULL pointer */
 	tmp = mm_malloc((i + 1) * sizeof(char *));
@@ -369,10 +386,16 @@ event_get_supported_methods(void)
 		return (NULL);
 
 	/* populate the array with the supported methods */
-	for (k = 0; k < i; ++k)
-		tmp[k] = eventops[k]->name;
+	for (k = 0, i = 0; eventops[k] != NULL; ++k) {
+		if (event_is_method_disabled(eventops[k]->name))
+			continue;
+		tmp[i++] = eventops[k]->name;
+	}
 	tmp[i] = NULL;
 
+	if (methods != NULL)
+		mm_free(methods);
+
 	methods = tmp;
 	
 	return (methods);

evport.c

@@ -141,11 +141,6 @@ evport_init(struct event_base *base)
 {
 	struct evport_data *evpd;
 	int i;
-	/*
-	 * Disable event ports when this environment variable is set 
-	 */
-	if (getenv("EVENT_NOEVPORT"))
-		return (NULL);
 
 	if (!(evpd = mm_calloc(1, sizeof(struct evport_data))))
 		return (NULL);

kqueue.c

@@ -99,10 +99,6 @@ kq_init(struct event_base *base)
 	int kq;
 	struct kqop *kqueueop;
 
-	/* Disable kqueue when this environment variable is set */
-	if (getenv("EVENT_NOKQUEUE"))
-		return (NULL);
-
 	if (!(kqueueop = mm_calloc(1, sizeof(struct kqop))))
 		return (NULL);
 

poll.c

@@ -87,10 +87,6 @@ poll_init(struct event_base *base)
 {
 	struct pollop *pollop;
 
-	/* Disable poll when this environment variable is set */
-	if (getenv("EVENT_NOPOLL"))
-		return (NULL);
-
 	if (!(pollop = mm_calloc(1, sizeof(struct pollop))))
 		return (NULL);
 

select.c

@@ -94,10 +94,6 @@ select_init(struct event_base *base)
 {
 	struct selectop *sop;
 
-	/* Disable select when this environment variable is set */
-	if (getenv("EVENT_NOSELECT"))
-		return (NULL);
-
 	if (!(sop = mm_calloc(1, sizeof(struct selectop))))
 		return (NULL);
 

test/regress.c

@@ -495,7 +495,7 @@ test_fork(void)
 	if ((pid = fork()) == 0) {
 		/* in the child */
 		if (event_reinit(current_base) == -1) {
-			fprintf(stderr, "FAILED (reinit)\n");
+			fprintf(stdout, "FAILED (reinit)\n");
 			exit(1);
 		}
 
@@ -515,12 +515,12 @@ test_fork(void)
 	write(pair[0], TEST1, strlen(TEST1)+1);
 
 	if (waitpid(pid, &status, 0) == -1) {
-		fprintf(stderr, "FAILED (fork)\n");
+		fprintf(stdout, "FAILED (fork)\n");
 		exit(1);
 	}
 	
 	if (WEXITSTATUS(status) != 76) {
-		fprintf(stderr, "FAILED (exit): %d\n", WEXITSTATUS(status));
+		fprintf(stdout, "FAILED (exit): %d\n", WEXITSTATUS(status));
 		exit(1);
 	}
 
@@ -1971,7 +1971,7 @@ rpc_test(void)
 
 	gettimeofday(&tv_end, NULL);
 	evutil_timersub(&tv_end, &tv_start, &tv_end);
-	fprintf(stderr, "(%.1f us/add) ",
+	fprintf(stdout, "(%.1f us/add) ",
 	    (float)tv_end.tv_sec/(float)i * 1000000.0 +
 	    tv_end.tv_usec / (float)i);
 
@@ -2109,16 +2109,16 @@ test_methods(void)
 	const char *backend;
 	int n_methods = 0;
 
-	fprintf(stderr, "Testing supported methods: ");
+	fprintf(stdout, "Testing supported methods: ");
 
 	if (methods == NULL) {
-		fprintf(stderr, "FAILED\n");
+		fprintf(stdout, "FAILED\n");
 		exit(1);
 	}
 
 	backend = methods[0];
 	while (*methods != NULL) {
-		fprintf(stderr, "%s ", *methods);
+		fprintf(stdout, "%s ", *methods);
 		++methods;
 		++n_methods;
 	}
@@ -2135,19 +2135,19 @@ test_methods(void)
 
 	base = event_base_new_with_config(cfg);
 	if (base == NULL) {
-		fprintf(stderr, "FAILED\n");
+		fprintf(stdout, "FAILED\n");
 		exit(1);
 	}
 
 	if (strcmp(backend, event_base_get_method(base)) == 0) {
-		fprintf(stderr, "FAILED\n");
+		fprintf(stdout, "FAILED\n");
 		exit(1);
 	}
 
 	event_base_free(base);
 	event_config_free(cfg);
 done:
-	fprintf(stderr, "OK\n");
+	fprintf(stdout, "OK\n");
 }