BIND(2)                   FreeBSD System Calls Manual                  BIND(2)

NAME
     bind - assign a local protocol address to a socket

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/socket.h>

     int
     bind(int s, const struct sockaddr *addr, socklen_t addrlen);

DESCRIPTION
     The bind() system call assigns the local protocol address to a socket.
     When a socket is created with socket(2) it exists in an address family
     space but has no protocol address assigned.  The bind() system call
     requests that addr be assigned to the socket.

NOTES
     Binding an address in the UNIX domain creates a socket in the file system
     that must be deleted by the caller when it is no longer needed (using
     unlink(2)).

     The rules used in address binding vary between communication domains.
     Consult the manual entries in section 4 for detailed information.

     For maximum portability, you should always zero the socket address
     structure before populating it and passing it to bind().

RETURN VALUES
     The bind() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     The bind() system call will fail if:

     [EAGAIN]           Kernel resources to complete the request are
                        temporarily unavailable.

     [EBADF]            The s argument is not a valid descriptor.

     [EINVAL]           The socket is already bound to an address, and the
                        protocol does not support binding to a new address; or
                        the socket has been shut down.

     [EINVAL]           The addrlen argument is not a valid length for the
                        address family.

     [ENOTSOCK]         The s argument is not a socket.

     [EADDRNOTAVAIL]    The specified address is not available from the local
                        machine.

     [EADDRINUSE]       The specified address is already in use.

     [EAFNOSUPPORT]     Addresses in the specified address family cannot be
                        used with this socket.

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

     [EFAULT]           The addr argument is not in a valid part of the user
                        address space.

     The following errors are specific to binding addresses in the UNIX
     domain.

     [ENOTDIR]    A component of the path prefix is not a directory.

     [ENAMETOOLONG]
                  A component of a pathname exceeded 255 characters, or an
                  entire path name exceeded 1023 characters.

     [ENOENT]     A prefix component of the path name does not exist.

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

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

     [EINTEGRITY]
                  Corrupted data was detected while reading from the file
                  system.

     [EROFS]      The name would reside on a read-only file system.

     [EISDIR]     An empty pathname was specified.

SEE ALSO
     connect(2), getsockname(2), listen(2), socket(2)

HISTORY
     The bind() system call appeared in 4.2BSD.

FreeBSD 13.1-RELEASE-p6         March 30, 2020         FreeBSD 13.1-RELEASE-p6