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--- c-socket-programming:socket [2024/06/19 08:32] – pejman
+++ c-socket-programming:socket [2024/06/19 10:03] (فعلی) – pejman
@@ خط 19: / خط 19: @@
 <code C>
+// socket.c
+// gcc -std=c99 -Wall -Wextra -Werror -pedantic -o socket socket.c
+#define _POSIX_C_SOURCE 200112L
 #include <stdio.h>
 #include <string.h>
@@ خط 30: / خط 35: @@
 #define handle_error(msg) \
     do { perror(msg); exit(EXIT_FAILURE); } while (0)
 #define PORT "3440"
 int main()
 {
-	int sockfd, errcode;
+    int sockfd, errcode;
-	struct addrinfo hints, *res, *rp;
+    struct addrinfo hints, *res, *rp;
-	char *ipver, ipstr[INET6_ADDRSTRLEN];
+    char *ipver, ipstr[INET6_ADDRSTRLEN];
-	void *addr;
+    void *addr;
-	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = AF_UNSPEC;
-	hints.ai_socktype = SOCK_DGRAM;
-	hints.ai_flags = AI_PASSIVE;    /* For wildcard IP address */
-	errcode = getaddrinfo(NULL, PORT, &hints, &res);
-	if (errcode != 0) {
-		fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(errcode));
-		exit(EXIT_FAILURE);
-	}
-	for (rp = res; rp != NULL; rp = rp->ai_next) {
-		sockfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
-		if (sockfd == -1) {
-			handle_error("socket() error");
-			continue;
-		}
-		if (rp->ai_family == AF_INET) {
-			ipver = "IPv4";
-			addr = &(((struct sockaddr_in*)(rp->ai_addr))->sin_addr);
-		} else {
-			ipver = "IPv6";
-			addr = &(((struct sockaddr_in6*)(rp->ai_addr))->sin6_addr);
-		}
-		inet_ntop(rp->ai_family, addr, ipstr, sizeof ipstr);
-		fprintf(stdout, "I got a %s socket for %s = %d\n", ipver, ipstr, sockfd);
-		close(sockfd);
-	}
-	freeaddrinfo(res);
-	return 0;
-}
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_DGRAM;
+    hints.ai_flags = AI_PASSIVE;    /* For wildcard IP address */
+    errcode = getaddrinfo(NULL, PORT, &hints, &res);
+    if (errcode != 0) {
+        fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(errcode));
+        exit(EXIT_FAILURE);
+    }
+    for (rp = res; rp != NULL; rp = rp->ai_next) {
+        sockfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+        if (sockfd == -1) {
+            handle_error("socket() error");
+            continue;
+        }
+        if (rp->ai_family == AF_INET) {
+            ipver = "IPv4";
+            addr = &(((struct sockaddr_in*)(rp->ai_addr))->sin_addr);
+        } else {
+            ipver = "IPv6";
+            addr = &(((struct sockaddr_in6*)(rp->ai_addr))->sin6_addr);
+        }
+        inet_ntop(rp->ai_family, addr, ipstr, sizeof ipstr);
+        fprintf(stdout, "I got an %s socket for %s = %d\n", ipver, ipstr, sockfd);
+        close(sockfd);
+    }
+    freeaddrinfo(res);
+    return 0;
+}
 </code>
 خروجی
-  I got a IPv4 socket for 0.0.0.0 = 3
+  I got an IPv4 socket for 0.0.0.0 = 3
-  I got a IPv6 socket for :: = 3
+  I got an IPv6 socket for :: = 3