refactor(socket): improve read/write

include/core/socket.h

@@ -4,8 +4,8 @@
 #include <myclib/mystring.h>
 #include <sys/types.h>
 
-ssize_t cws_socket_read(int sockfd, string_s *str);
+int cws_socket_read(int sockfd, string_s *str);
 
-ssize_t cws_socket_send(int sockfd, const char *buffer, size_t len, int flags);
+int cws_socket_send(int sockfd, const char *buffer, size_t len, int flags);
 
 #endif

src/core/socket.c

@@ -3,46 +3,64 @@
 #include <errno.h>
 #include <sys/socket.h>
 
-ssize_t cws_socket_read(int sockfd, string_s *str) {
+int cws_socket_read(int sockfd, string_s *str) {
 	char tmp[4096] = {0};
 
-	ssize_t n = recv(sockfd, tmp, sizeof tmp, 0);
-	if (n < 0) {
-		if (errno == EAGAIN || errno == EWOULDBLOCK) {
+	for (;;) {
+		ssize_t n = recv(sockfd, tmp, sizeof tmp, 0);
+
+		/* We have some data */
+		if (n > 0) {
+			tmp[n] = '\0';
+			string_append(str, tmp);
+			return n;
+		}
+
+		/* Client closed */
+		if (n == 0) {
 			return 0;
 		}
+
+		if (errno == EINTR) {
+			continue;
+		}
+
+		/* No data now */
+		if (errno == EAGAIN || errno == EWOULDBLOCK) {
+			return -2;
+		}
+
+		/* Something happened */
 		return -1;
 	}
-
-	if (n == 0) {
-		return -1;
-	}
-
-	tmp[n] = '\0';
-	string_append(str, tmp);
-	return n;
 }
 
-ssize_t cws_socket_send(int sockfd, const char *buffer, size_t len, int flags) {
+int cws_socket_send(int sockfd, const char *buffer, size_t len, int flags) {
 	size_t total_sent = 0;
-	ssize_t n;
 
 	while (total_sent < len) {
-		n = send(sockfd, buffer + total_sent, len - total_sent, flags);
+		ssize_t n = send(sockfd, buffer + total_sent, len - total_sent, flags);
 
-		if (n < 0) {
-			if (errno == EAGAIN || errno == EWOULDBLOCK) {
-				break;
-			}
-			return -1;
+		if (n > 0) {
+			total_sent += (size_t)n;
+			continue;
 		}
 
 		if (n == 0) {
 			break;
 		}
 
-		total_sent += n;
+		if (errno == EINTR) {
+			continue;
+		}
+
+		/* Partial write */
+		if (errno == EAGAIN || errno == EWOULDBLOCK) {
+			break;
+		}
+
+		return -1;
 	}
 
-	return total_sent;
+	return (ssize_t)total_sent;
 }