Linux cli command sockaddr_intype

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command sockaddr_intype and provides detailed information about the command sockaddr_intype, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the sockaddr_intype.

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NAME 🖥️ sockaddr_intype 🖥️

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

sockaddr
Describes a socket address.

sockaddr_storage
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.

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

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

Internet domain sockets

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

sockaddr_in6
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

sockaddr_un
Describes a UNIX domain socket address.

STANDARDS

POSIX.1-2008.

HISTORY

POSIX.1-2001.

socklen_t was invented by POSIX. See also accept(2).

These structures were invented before modern ISO C strict-aliasing rules. If aliasing rules are applied strictly, these structures would be extremely difficult to use without invoking Undefined Behavior. POSIX Issue 8 will fix this by requiring that implementations make sure that these structures can be safely used as they were designed.

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)

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