X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=libustcomm%2Fustcomm.c;h=2bd86eb728442c2713f74cd24a30766706d731c8;hb=41157ed730c602a813f993ab255edced2935cbdb;hp=1f4bce95cbc4a7f726c1d612ca28e5cb130d42d2;hpb=c97d443730716166051e0b6b95d26ab3faadf8dc;p=ust.git

diff --git a/libustcomm/ustcomm.c b/libustcomm/ustcomm.c
index 1f4bce9..2bd86eb 100644
--- a/libustcomm/ustcomm.c
+++ b/libustcomm/ustcomm.c
@@ -23,6 +23,7 @@
 #include <sys/un.h>
 #include <unistd.h>
 #include <poll.h>
+#include <sys/stat.h>
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -30,7 +31,7 @@
 #include <execinfo.h>
 
 #include "ustcomm.h"
-#include "localerr.h"
+#include "usterr.h"
 
 #define UNIX_PATH_MAX 108
 
@@ -66,29 +67,18 @@ char *strdup_malloc(const char *s)
 
 static int signal_process(pid_t pid)
 {
-	int result;
-
-	result = kill(pid, UST_SIGNAL);
-	if(result == -1) {
-		PERROR("kill");
-		return -1;
-	}
-
-	/* FIXME: should wait in a better way */
-	//sleep(1);
-
 	return 0;
 }
 
 int pid_is_online(pid_t pid) {
-	return kill(pid, UST_SIGNAL) != -1;
+	return 1;
 }
 
 static int send_message_fd(int fd, const char *msg)
 {
 	int result;
 
-	result = send(fd, msg, strlen(msg), 0);
+	result = send(fd, msg, strlen(msg), MSG_NOSIGNAL);
 	if(result == -1) {
 		PERROR("send");
 		return -1;
@@ -191,6 +181,23 @@ int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_
 	return 0;
 } 
 
+/* Called after a fork. */
+
+int ustcomm_close_all_connections(struct ustcomm_server *server)
+{
+	struct ustcomm_connection *conn;
+	struct ustcomm_connection *deletable_conn = NULL;
+
+	list_for_each_entry(conn, &server->connections, list) {
+		free(deletable_conn);
+		deletable_conn = conn;
+		close(conn->fd);
+		list_del(&conn->list);
+	}
+
+	return 0;
+}
+
 /* @timeout: max blocking time in milliseconds, -1 means infinity
  *
  * returns 1 to indicate a message was received
@@ -361,8 +368,7 @@ static int init_named_socket(const char *name, char **path_out)
 	}
 
 	if(path_out) {
-		*path_out = "";
-		*path_out = strdupa(addr.sun_path);
+		*path_out = strdup(addr.sun_path);
 	}
 
 	return fd;
@@ -373,13 +379,24 @@ static int init_named_socket(const char *name, char **path_out)
 	return -1;
 }
 
+/*
+ * Return value:
+ *   0: Success, but no reply because recv() returned 0
+ *   1: Success
+ *   -1: Error
+ *
+ * On error, the error message is printed, except on
+ * ECONNRESET, which is normal when the application dies.
+ */
+
 int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply)
 {
 	int result;
 
-	result = send(conn->fd, req, strlen(req), 0);
+	result = send(conn->fd, req, strlen(req), MSG_NOSIGNAL);
 	if(result == -1) {
-		PERROR("send");
+		if(errno != EPIPE)
+			PERROR("send");
 		return -1;
 	}
 
@@ -389,7 +406,8 @@ int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char
 	*reply = (char *) malloc(MSG_MAX+1);
 	result = recv(conn->fd, *reply, MSG_MAX, 0);
 	if(result == -1) {
-		PERROR("recv");
+		if(errno != ECONNRESET)
+			PERROR("recv");
 		return -1;
 	}
 	else if(result == 0) {
@@ -477,7 +495,7 @@ int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle)
 
 	handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath));
 	if(handle->server.listen_fd < 0) {
-		ERR("error initializing named socket");
+		ERR("Error initializing named socket (%s). Check that directory exists and that it is writable.", name);
 		goto free_name;
 	}
 	free(name);
@@ -522,6 +540,31 @@ free_name:
 	return retval;
 }
 
+void ustcomm_fini_app(struct ustcomm_app *handle)
+{
+	int result;
+	struct stat st;
+
+	/* Destroy socket */
+	result = stat(handle->server.socketpath, &st);
+	if(result == -1) {
+		PERROR("stat (%s)", handle->server.socketpath);
+		return;
+	}
+
+	/* Paranoid check before deleting. */
+	result = S_ISSOCK(st.st_mode);
+	if(!result) {
+		ERR("The socket we are about to delete is not a socket.");
+		return;
+	}
+
+	result = unlink(handle->server.socketpath);
+	if(result == -1) {
+		PERROR("unlink");
+	}
+}
+
 static char *find_tok(char *str)
 {
 	while(*str == ' ') {