NAME | SYNOPSIS | DESCRIPTION | SEE ALSO
#include <sys/socket.h>
The <sys/socket.h> header defines the unsigned integral type sa_family_t through typedef.
The <sys/socket.h> header defines the sockaddr structure that includes the following members:
sa_family_t | sa_family | /* address family */ |
char | sa_data[ ] | /* socket address (variable-length data) */ |
The <sys/socket.h> header defines the msghdr structure that includes the following members:
void | *msg_name | /* optional address */ |
size_t | msg_namelen | /* size of address */ |
struct iovec | *msg_iov | /* scatter/gather array */ |
int | msg_iovlen | /* members in msg_iov */ |
void | *msg_control | /* ancillary data, see below */ |
size_t | msg_controllen | /* ancillary data buffer len */ |
int | msg_flags | /* flags on received message */ |
The <sys/socket.h> header defines the cmsghdr structure that includes the following members:
size_t | cmsg_len | /* data byte count, including hdr */ |
int | cmsg_level | /* originating protocol */ |
int | cmsg_type | /* protocol-specific type */ |
Ancillary data consists of a sequence of pairs, each consisting of a cmsghdr structure followed by a data array. The data array contains the ancillary data message, and the cmsghdr structure contains descriptive information that allows an application to correctly parse the data.
The values for cmsg_level will be legal values for the level argument to the getsockopt() and setsockopt() functions. The SCM_RIGHTS type is supported for level SOL_SOCKET.
Ancillary data is also possible at the socket level. The <sys/socket.h> header defines the following macro for use as the cmsg_type value when cmsg_level is SOL_SOCKET:
Indicates that the data array contains the access rights to be sent or received.
The <sys/socket.h> header defines the following macros to gain access to the data arrays in the ancillary data associated with a message header:
If the argument is a pointer to a cmsghdr structure, this macro returns an unsigned character pointer to the data array associated with the cmsghdr structure.
If the first argument is a pointer to a msghdr structure and the second argument is a pointer to a cmsghdr structure in the ancillary data, pointed to by the msg_control field of that msghdr structure, this macro returns a pointer to the next cmsghdr structure, or a null pointer if this structure is the last cmsghdr in the ancillary data.
If the argument is a pointer to a msghdr structure, this macro returns a pointer to the first cmsghdr structure in the ancillary data associated with this msghdr structure, or a null pointer if there is no ancillary data associated with the msghdr structure.
The <sys/socket.h> header defines the linger structure that includes the following members:
int | l_onoff | /* indicates whether linger option is enabled */ |
int | l_linger | /* linger time, in seconds */ |
The <sys/socket.h> header defines the following macros:
Datagram socket
Byte-stream socket
Sequenced-packet socket
The <sys/socket.h> header defines the following macro for use as the level argument of setsockopt() and getsockopt().
Options to be accessed at socket level, not protocol level.
The <sys/socket.h> header defines the following macros: for use as the option_name argument in getsockopt() or setsockopt() calls:
Debugging information is being recorded.
Socket is accepting connections.
Transmission of broadcast messages is supported.
Reuse of local addresses is supported.
Connections are kept alive with periodic messages.
Socket lingers on close.
Out-of-band data is transmitted in line.
Send buffer size.
Receive buffer size.
Socket error status.
Socket type.
The <sys/socket.h> header defines the following macros for use as the valid values for the msg_flags field in the msghdr structure, or the flags parameter in recvfrom(), recvmsg(), sendto(), or sendmsg() calls:
Control data truncated.
Terminates a record (if supported by the protocol).
Out-of-band data.
Leave received data in queue.
Normal data truncated.
Wait for complete message.
The <sys/socket.h> header defines the following macros:
UNIX domain sockets
Internet domain sockets
The <sys/socket.h> header defines the following macros:
Disables further receive operations.
Disables further send operations.
Disables further send and receive operations.
The following are declared as functions, and may also be defined as macros:
int accept(int socket, struct sockaddr *address, size_t *address_len);
int bind(int socket, const struct sockaddr *address, size_t address_len);
int connect(int socket, const struct sockaddr *address, size_t address_len);
int getpeername(int socket, struct sockaddr *address, size_t *address_len);
int getsockname(int socket, struct sockaddr *address, size_t *address_len);
int getsockopt(int socket, int level, int option_name, void *option_value, size_t *option_len);
int listen(int socket, int backlog);
ssize_t recv(int socket, void *buffer, size_t length, int flags);
ssize_t recvfrom(int socket, void *buffer, size_t length, int flags, struct sockaddr *address, size_t *address_len);
ssize_t recvmsg(int socket, struct msghdr *message, int flags);
ssize_t send(int socket, const void *message, size_t length, int flags);
ssize_t sendmsg(int socket, const struct msghdr *message, int flags);
ssize_t sendto(int socket, const void *message, size_t length, int flags, const struct sockaddr *dest_addr, size_t dest_len);
int setsockopt(int socket, int level, int option_name, const void *option_value, size_t option_len);
int shutdown(int socket, int how);
int socket(int domain, int type, int protocol);
int socketpair(int domain, int type, int protocol, int socket_vector[2]);
accept(3SOCKET), accept(3XNET), bind(3SOCKET), bind(3XNET), connect(3SOCKET), connect(3XNET), getpeername(3SOCKET), getpeername(3XNET), getsockname(3SOCKET), getsockname(3XNET), getsockopt(3SOCKET), getsockopt(3XNET), listen(3SOCKET), listen(3XNET), recv(3SOCKET), recv(3XNET), recvfrom(3SOCKET), recvfrom(3XNET), recvmsg(3SOCKET), recvmsg(3XNET), send(3SOCKET), send(3XNET), sendmsg(3SOCKET), sendmsg(3XNET), sendto(3SOCKET), sendto(3XNET), setsockopt(3SOCKET), setsockopt(3XNET), shutdown(3SOCKET), shutdown(3XNET), socket(3SOCKET), socket(3XNET), socketpair(3SOCKET) socketpair(3XNET)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO