Use poll instead of select

Close #637

native/jni/daemon/socket.c

@@ -40,23 +40,11 @@ int create_rand_socket(struct sockaddr_un *sun) {
 }
 
 int socket_accept(int sockfd, int timeout) {
-	struct timeval tv;
-	fd_set fds;
-	int rc;
-
-	tv.tv_sec = timeout;
-	tv.tv_usec = 0;
-	FD_ZERO(&fds);
-	FD_SET(sockfd, &fds);
-	do {
-		rc = select(sockfd + 1, &fds, NULL, NULL, &tv);
-	} while (rc < 0 && errno == EINTR);
-	if (rc < 1) {
-		PLOGE("select");
-		return -1;
-	}
-
-	return xaccept4(sockfd, NULL, NULL, SOCK_CLOEXEC);
+	struct pollfd pfd = {
+		.fd = sockfd,
+		.events = POLL_IN
+	};
+	return xpoll(&pfd, 1, timeout * 1000) <= 0 ? -1 : xaccept4(sockfd, NULL, NULL, SOCK_CLOEXEC);
 }
 
 /*

native/jni/su/su_daemon.c

@@ -168,12 +168,14 @@ static struct su_info *get_su_info(unsigned uid) {
 		// Connect manager
 		app_connect(addr.sun_path + 1, info);
 		int fd = socket_accept(sockfd, 60);
-
-		socket_send_request(fd, info);
-		int ret = read_int_be(fd);
-		info->access.policy = ret < 0 ? DENY : ret;
-
-		close(fd);
+		if (fd < 0) {
+			info->access.policy = DENY;
+		} else {
+			socket_send_request(fd, info);
+			int ret = read_int_be(fd);
+			info->access.policy = ret < 0 ? DENY : ret;
+			close(fd);
+		}
 		close(sockfd);
 	}
 

native/jni/utils/include/utils.h

@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <dirent.h>
 #include <pthread.h>
+#include <poll.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 
@@ -78,6 +79,7 @@ void *xmmap(void *addr, size_t length, int prot, int flags,
 	int fd, off_t offset);
 ssize_t xsendfile(int out_fd, int in_fd, off_t *offset, size_t count);
 pid_t xfork();
+int xpoll(struct pollfd *fds, nfds_t nfds, int timeout);
 
 // misc.c
 

native/jni/utils/xwrap.c

@@ -394,3 +394,11 @@ pid_t xfork() {
 	}
 	return ret;
 }
+
+int xpoll(struct pollfd *fds, nfds_t nfds, int timeout) {
+	int ret = poll(fds, nfds, timeout);
+	if (ret == -1) {
+		PLOGE("poll");
+	}
+	return ret;
+}