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Linux man pages : bind (2)
BIND(2)			   Linux Programmer's Manual		       BIND(2)


bind - bind a name to a socket


#include <sys/types.h> #include <sys/socket.h> int bind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);


bind gives the socket sockfd the local address my_addr. my_addr is addrlen bytes long. Traditionally, this is called "assigning a name to a socket." When a socket is created with socket(2), it exists in a name space (address family) but has no name assigned. It is normally necessary to assign a local address using bind before a SOCK_STREAM socket may receive connections (see accept(2)). The rules used in name binding vary between address families. Consult the manual entries in Section 7 for detailed information. For AF_INET see ip(7), for AF_UNIX see unix(7), for AF_APPLETALK see ddp(7), for AF_PACKET see packet(7), for AF_X25 see x25(7) and for AF_NETLINK see netlink(7).


On success, zero is returned. On error, -1 is returned, and errno is set appropriately.


EBADF sockfd is not a valid descriptor. EINVAL The socket is already bound to an address. This may change in the future: see linux/unix/sock.c for details. EACCES The address is protected, and the user is not the super-user. ENOTSOCK Argument is a descriptor for a file, not a socket. The following errors are specific to UNIX domain (AF_UNIX) sockets: EINVAL The addrlen is wrong, or the socket was not in the AF_UNIX fam- ily. EROFS The socket inode would reside on a read-only file system. EFAULT my_addr points outside the user's accessible address space. ENAMETOOLONG my_addr is too long. ENOENT The file does not exist. ENOMEM Insufficient kernel memory was available. ENOTDIR A component of the path prefix is not a directory. EACCES Search permission is denied on a component of the path prefix. ELOOP Too many symbolic links were encountered in resolving my_addr.


The transparent proxy options are not described.


SVr4, 4.4BSD (the bind function first appeared in BSD 4.2). SVr4 docu- ments additional EADDRNOTAVAIL, EADDRINUSE, and ENOSR general error conditions, and additional EIO and EISDIR Unix-domain error conditions.


The third argument of bind is in reality an int (and this is what BSD 4.* and libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t. See also accept(2).


accept(2), connect(2), listen(2), socket(2), getsockname(2), ip(7), socket(7) Linux 2.2 1998-10-03 BIND(2)