0.3.0: converge relibc to upstream 0.6.0 + Red Bear patches

tests/sys_socket/unixsocketpair.c

@@ -0,0 +1,59 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include <errno.h>
+
+#include "test_helpers.h"
+
+void socketpair_test(int flags) {
+    int sv[2]; 
+    pid_t pid;
+    char buf[64];
+    const char *parent_msg = "ping";
+    const char *child_msg = "pong";
+
+    int status = socketpair(AF_UNIX, flags, 0, sv);
+    ERROR_IF(socketpair, status, == -1);
+
+    pid = fork();
+    ERROR_IF(fork, pid, == -1);
+
+    if (pid == 0) {
+        close(sv[0]); 
+
+        ssize_t n = recv(sv[1], buf, sizeof(buf), 0);
+        ERROR_IF(recv, n, == -1);
+        printf("child:  %s\n", buf);
+
+        status = send(sv[1], child_msg, 5, 0);
+        ERROR_IF(send, status, == -1);
+
+        close(sv[1]);
+        exit(0);
+    } else {
+        close(sv[1]); 
+
+        status = send(sv[0], parent_msg, 5, 0);
+        ERROR_IF(send, status, == -1);
+
+        ssize_t n = recv(sv[0], buf, sizeof(buf), 0);
+        ERROR_IF(recv, n, == -1);
+        printf("parent: %s\n", buf);
+
+        close(sv[0]);
+        wait(NULL); 
+    }
+}
+
+int main(void) {
+    printf("SOCK_STREAM\n");
+    socketpair_test(SOCK_STREAM);
+    printf("SOCK_DGRAM\n");
+    socketpair_test(SOCK_DGRAM);
+    return 0;
+}