NAME

bind − bind a name to a socket

SYNOPSIS

#include <sys/types.h>

int bind(int s, const struct sockaddr ∗name, int namelen);

DESCRIPTION

bind assigns a name to an unnamed socket.  When a socket is created with socket, it exists in a name space (address family) but has no name assigned.  bind requests that the name pointed to by name be assigned to the socket. 

RETURN VALUE

If the bind is successful, a 0 value is returned.  A return value of −1 indicates an error, which is further specified in the global errno. 

ERRORS

The bind call will fail if:

EBADF s is not a valid descriptor. 

ENOTSOCK s is a descriptor for a file, not a socket. 

EADDRNOTAVAIL The specified address is not available on the local machine. 

EADDRINUSE The specified address is already in use. 

EINVAL namelen is not the size of a valid address for the specified address family. 

EINVAL The socket is already bound to an address. 

EACCES The requested address is protected and the current user has inadequate permission to access it. 

ENOSR There were insufficient STREAMS resources for the operation to complete. 

The following errors are specific to binding names in the UNIX domain:

ENOTDIR A component of the path prefix of the pathname in name is not a directory. 

ENOENT A component of the path prefix of the pathname in name does not exist. 

EACCES Search permission is denied for a component of the path prefix of the pathname in name.

ELOOP Too many symbolic links were encountered in translating the pathname in name.

EIO An I/O error occurred while making the directory entry or allocating the inode. 

EROFS The inode would reside on a read-only file system. 

EISDIR A null pathname was specified. 

SEE ALSO

unlink(2) in the Programmer’s Reference Manual

NOTES

Binding a name in the UNIX domain creates a socket in the file system that must be deleted by the caller when it is no longer needed [see unlink(2)]. 

The rules used in name binding vary between communication domains. 

The type of address structure passed to bind depends on the address family.  UNIX domain sockets (address family AF_UNIX) require a socketaddr_un structure as defined in sys/un.h; Internet domain sockets (address family AF_INET) require a sockaddr_in structure as defined in netinet/in.h.  Other address families may require other structures.  Use the structure appropriate to the address family; cast the structure address to a generic sockaddr in the call to bind and pass the size of the structure in the namelen argument.