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--- c_network [2013/04/11 16:04] – djbuldog
+++ c_network [2025/08/28 10:09] (aktuální) – upraveno mimo DokuWiki 127.0.0.1
@@ Řádek 42: / Řádek 42: @@
 uint32_t ntohl(uint32_t netlong);
 uint16_t ntohs(uint16_t netshort);
+</code>
+==== Prace s adresami ====
+  * struct sockaddr je nejvice obecna
+  * jednotlive struktury jsou mezi sebou prevoditelne, ale nemusi mit vubec stejnou delku!! Je treba si uvedomit, kam mohu kdy sahnout ve strukture.
+<code>
+include <netinet/in.h>
+// All pointers to socket address structures are often cast to pointers
+// to this type before use in various functions and system calls:
+struct sockaddr {
+    unsigned short    sa_family;    // address family, AF_xxx
+    char              sa_data[14];  // 14 bytes of protocol address
+};
+// IPv4 AF_INET sockets:
+struct sockaddr_in {
+    short            sin_family;   // e.g. AF_INET, AF_INET6
+    unsigned short   sin_port;     // e.g. htons(3490)
+    struct in_addr   sin_addr;     // see struct in_addr, below
+    char             sin_zero[8];  // zero this if you want to
+};
+struct in_addr {
+    unsigned long s_addr;          // load with inet_pton()
+};
+// IPv6 AF_INET6 sockets:
+struct sockaddr_in6 {
+    u_int16_t       sin6_family;   // address family, AF_INET6
+    u_int16_t       sin6_port;     // port number, Network Byte Order
+    u_int32_t       sin6_flowinfo; // IPv6 flow information
+    struct in6_addr sin6_addr;     // IPv6 address
+    u_int32_t       sin6_scope_id; // Scope ID
+};
+struct in6_addr {
+    unsigned char   s6_addr[16];   // load with inet_pton()
+};
+// General socket address holding structure, big enough to hold either
+// struct sockaddr_in or struct sockaddr_in6 data:
+struct sockaddr_storage {
+    sa_family_t  ss_family;     // address family
+    // all this is padding, implementation specific, ignore it:
+    char      __ss_pad1[_SS_PAD1SIZE];
+    int64_t   __ss_align;
+    char      __ss_pad2[_SS_PAD2SIZE];
+};
 </code>