user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/linux/getifaddrs.c

@@ -0,0 +1,65 @@
+#include <arpa/inet.h>
+#include <assert.h>
+#include <ifaddrs.h>
+#include <linux/if_link.h>
+#include <net/if.h>
+#include <netdb.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+	(void) argc;
+	(void) argv;
+
+	struct ifaddrs *ifaddr = 0;
+	char host[NI_MAXHOST];
+	bool loopback_found = false;
+
+	if(getifaddrs(&ifaddr)) {
+		perror("getifaddrs");
+		exit(EXIT_FAILURE);
+	}
+
+	for(struct ifaddrs *ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
+		if(ifa->ifa_addr == NULL)
+			continue;
+
+		int family = ifa->ifa_addr->sa_family;
+
+		if(family == AF_INET && !strcmp("lo", ifa->ifa_name)) {
+			loopback_found = true;
+
+			printf("%-10s %s (%d)\n", ifa->ifa_name,
+				(family == AF_INET)  ? "AF_INET" : (family == AF_INET6) ? "AF_INET6" : "???",
+				family
+			);
+
+			int s = getnameinfo(ifa->ifa_addr,
+				(family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6),
+				host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+			assert(!s);
+
+			printf("\t\taddress: <%s>\n", host);
+			if(ifa->ifa_netmask)
+				printf("\t\tnetmask: <%s>\n", inet_ntoa(((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr));
+
+			if(ifa->ifa_flags & IFF_BROADCAST) {
+				assert(ifa->ifa_broadaddr);
+				printf("\t\tbroadcast: <%s>\n", inet_ntoa(((struct sockaddr_in *) ifa->ifa_broadaddr)->sin_addr));
+			}
+
+			if(ifa->ifa_flags & IFF_POINTOPOINT) {
+				assert(ifa->ifa_dstaddr);
+				printf("\t\tdest addr: <%s>\n", inet_ntoa(((struct sockaddr_in *) ifa->ifa_dstaddr)->sin_addr));
+			}
+		}
+	}
+
+	freeifaddrs(ifaddr);
+
+	exit(loopback_found ? EXIT_SUCCESS : EXIT_FAILURE);
+}