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sockaddr(3type) sockaddr(3type)

NAME

sockaddr, sockaddr_storage, sockaddr_in, sockaddr_in6, sockaddr_un, socklen_t, in_addr, in6_addr, in_addr_t, in_port_t, - socket address

LIBRARY

Standard C library (libc)

SYNOPSIS

#include <sys/socket.h>
struct sockaddr {
    sa_family_t     sa_family;      /* Address family */
    char            sa_data[];      /* Socket address */
};
struct sockaddr_storage {
    sa_family_t     ss_family;      /* Address family */
};
typedef /* ... */ socklen_t;
typedef /* ... */ sa_family_t;




Internet domain sockets


#include <netinet/in.h>


struct sockaddr_in {
    sa_family_t     sin_family;     /* AF_INET */
    in_port_t       sin_port;       /* Port number */
    struct in_addr  sin_addr;       /* IPv4 address */
};


struct sockaddr_in6 {
    sa_family_t     sin6_family;    /* AF_INET6 */
    in_port_t       sin6_port;      /* Port number */
    uint32_t        sin6_flowinfo;  /* IPv6 flow info */
    struct in6_addr sin6_addr;      /* IPv6 address */
    uint32_t        sin6_scope_id;  /* Set of interfaces for a scope */
};


struct in_addr {
    in_addr_t s_addr;
};


struct in6_addr {
    uint8_t   s6_addr[16];
};


typedef uint32_t in_addr_t;
typedef uint16_t in_port_t;







UNIX domain sockets


#include <sys/un.h>


struct sockaddr_un {
    sa_family_t     sun_family;     /* Address family */
    char            sun_path[];     /* Socket pathname */
};









DESCRIPTION



  

  
Describes a socket address.

  

  
A structure at least as large as any other sockaddr_* address
      structures. It's aligned so that a pointer to it can be cast as a pointer
      to other sockaddr_* structures and used to access its fields.

  

  
Describes the length of a socket address. This is an integer type of at
      least 32 bits.

  

  
Describes a socket's protocol family. This is an unsigned integer
    type.






Internet domain sockets



  

  
Describes an IPv4 Internet domain socket address. The sin_port and
      sin_addr members are stored in network byte order.

  

  
Describes an IPv6 Internet domain socket address. The
      sin6_addr.s6_addr array is used to contain a 128-bit IPv6 address,
      stored in network byte order.








UNIX domain sockets



  

  
Describes a UNIX domain socket address.










STANDARDS


POSIX.1-2001 and later.






NOTES


socklen_t is also defined in <netdb.h>.


sa_family_t is also defined in <netinet/in.h>
    and <sys/un.h>.






SEE ALSO


accept(2), bind(2), connect(2),
    getpeername(2), getsockname(2), getsockopt(2),
    sendto(2), setsockopt(2), socket(2),
    socketpair(2), getaddrinfo(3), gethostbyaddr(3),
    getnameinfo(3), htonl(3), ipv6(7), socket(7)







  

    2022-10-30
    Linux man-pages 6.03