1.\" Copyright (c) 1983, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)bind.2 8.1 (Berkeley) 06/04/93 7.\" 8.Dd 9.Dt BIND 2 10.Os BSD 4.2 11.Sh NAME 12.Nm bind 13.Nd bind a name to a socket 14.Sh SYNOPSIS 15.Fd #include <sys/types.h> 16.Fd #include <sys/socket.h> 17.Ft int 18.Fn bind "int s" "struct sockaddr *name" "int namelen" 19.Sh DESCRIPTION 20.Fn Bind 21assigns a name to an unnamed socket. 22When a socket is created 23with 24.Xr socket 2 25it exists in a name space (address family) 26but has no name assigned. 27.Fn Bind 28requests that 29.Fa name 30be assigned to the socket. 31.Sh NOTES 32Binding a name in the UNIX domain creates a socket in the file 33system that must be deleted by the caller when it is no longer 34needed (using 35.Xr unlink 2 ) . 36.Pp 37The rules used in name binding vary between communication domains. 38Consult the manual entries in section 4 for detailed information. 39.Sh RETURN VALUES 40If the bind is successful, a 0 value is returned. 41A return value of -1 indicates an error, which is 42further specified in the global 43.Va errno . 44.Sh ERRORS 45The 46.Fn bind 47call will fail if: 48.Bl -tag -width EADDRNOTAVA 49.It Bq Er EBADF 50.Fa S 51is not a valid descriptor. 52.It Bq Er ENOTSOCK 53.Fa S 54is not a socket. 55.It Bq Er EADDRNOTAVAIL 56The specified address is not available from the local machine. 57.It Bq Er EADDRINUSE 58The specified address is already in use. 59.It Bq Er EINVAL 60The socket is already bound to an address. 61.It Bq Er EACCES 62The requested address is protected, and the current user 63has inadequate permission to access it. 64.It Bq Er EFAULT 65The 66.Fa name 67parameter is not in a valid part of the user 68address space. 69.El 70.Pp 71The following errors are specific to binding names in the UNIX domain. 72.Bl -tag -width EADDRNOTAVA 73.It Bq Er ENOTDIR 74A component of the path prefix is not a directory. 75.It Bq Er EINVAL 76The pathname contains a character with the high-order bit set. 77.It Bq Er ENAMETOOLONG 78A component of a pathname exceeded 255 characters, 79or an entire path name exceeded 1023 characters. 80.It Bq Er ENOENT 81A prefix component of the path name does not exist. 82.It Bq Er ELOOP 83Too many symbolic links were encountered in translating the pathname. 84.It Bq Er EIO 85An I/O error occurred while making the directory entry or allocating the inode. 86.It Bq Er EROFS 87The name would reside on a read-only file system. 88.It Bq Er EISDIR 89An empty pathname was specified. 90.El 91.Sh SEE ALSO 92.Xr connect 2 , 93.Xr listen 2 , 94.Xr socket 2 , 95.Xr getsockname 2 96.Sh HISTORY 97The 98.Nm 99function call appeared in 100.Bx 4.2 . 101