getaddrinfo example

Author: Your Name

getaddrinfo.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+
+
+int main(int argc, char **argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "need argument\n");
+		return 1;
+	}
+	struct addrinfo hints, *result, *tmp;
+	struct sockaddr_in *sock_addr;
+	int res;
+	hints.ai_flags = AI_PASSIVE;
+	hints.ai_family = AF_INET;
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_protocol = 0;
+	hints.ai_addrlen = 0;
+	hints.ai_canonname = NULL;
+	hints.ai_addr = NULL;
+	hints.ai_next = NULL;
+	//hints.ai_protocol = IPPROTO_ICMP;
+
+	if ((res = getaddrinfo(argv[1], NULL, &hints, &result)) != 0) {
+		fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(res));
+		return 1;
+	}
+
+	for (tmp = result; tmp; tmp = tmp->ai_next) {
+		/*
+		sockfd = socket(tmp->ai_family, tmp->ai.socktype, tmp->
+				ai_protocol);
+		if (sockfd == -1)
+			continue;
+		*/
+		sock_addr = (struct sockaddr_in *)tmp->ai_addr;
+		printf("address is: %s\n", inet_ntoa(sock_addr->sin_addr));
+	}
+	freeaddrinfo(result);
+	return 0;
+}

sockets/RAW/ping.c

@@ -1,9 +1,9 @@
 /*
  * ping.c
  * written by Ivan Ryabtsov ivriabtsov at gmail dot com
- * compile with: gcc -Wall -Wextra -g -O2 -DDEBUG=2 ping.c for maximum debug
- * gcc -Wall -Wextra -g -O2 -DDEBUG=1 ping.c for reduce debug
- * gcc -Wall -Wextra -g -O2  ping.c without debug
+ * compile with: gcc -Wall -Wextra -pthread -g -O2 -DDEBUG=2 maximum debug
+ * gcc -Wall -Wextra -pthread -g -O2 -DDEBUG=1 reduce debug
+ * gcc -Wall -Wextra -pthread -g -O2 -DDEBUG=0 without debug
  */
 #include <unistd.h>
 #include <stdio.h>