bind.2

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)bind.2	8.1	9/11/90
.TH bind 2
.SH Name
bind \- bind a name to a socket
.SH Syntax
.nf
.ft B
#include <sys/types.h>
#include <sys/socket.h>
.PP
.ft B
bind(s, name, namelen)
int s;
struct sockaddr *name;
int namelen;
.PP
.ft B
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
.PP
.ft B
bind(s, name, namelen)
int s;
struct sockaddr_un *name; 
int namelen;
.fi
.SH Description
.NXR "bind system call" 
.NXA "bind system call" "listen system call"
.NXR "socket" "binding to a name"
The
.PN bind
system call assigns a name to an unnamed socket.
When a socket is created 
with the 
.PN socket 
call, it exists in a name space (address family)
but has no name assigned.
The
.PN bind
system call requests that
.IR name 
be assigned to the socket.
.PP
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, using the 
.PN unlink 
system call.
.PP
The
.I sockaddr
argument specifies a general address family.
The
.I sockaddr_un
argument specifies an address family in the UNIX domain.
.PP
The rules used in name binding vary between communication domains.
Consult the reference pages in the
\fIULTRIX Reference Pages Section 4: Special Files\fP 
for detailed information.
.SH Return Value 
If the 
.PN bind
is successful, the call returns a 0 value. 
A return value of \-1 indicates an error, which is
further specified in the global variable \fIerrno\fP.
.SH Diagnostics
The 
.PN bind
call fails under the following conditions:
.TP 15
[EBADF]
\fIS\fP is an invalid descriptor.
.TP 15
[ENOTSOCK]
\fIS\fP is not a socket.
.TP 15
[EADDRNOTAVAIL]
The specified address is not available from the local machine.
.TP 15
[EADDRINUSE]
The specified address is already in use.
.TP 15
[EINVAL]
The socket is already bound to an address.
.TP 15
[EACCESS]
The requested address is protected, and the current user
has inadequate permission to access it.
.TP 15
[EFAULT]
The \fIname\fP parameter is not in a valid part of the user
address space.
.PP
The following errors are specific to binding names in the
UNIX domain:
.TP 15
[ENOTDIR]
A component of the path prefix is not a directory.
.TP 15
[ENAMETOOLONG]
A component of a pathname exceeds 255 characters,
or an entire pathname exceeds 1023 characters.
.TP 15
[ENOENT]
A prefix component of the path name does not exist.
.TP 15
[ELOOP]
Too many symbolic links were encountered in translating
the pathname.
.TP 15
[EIO]
An I/O error occurred while making the directory entry
or allocating the inode.
.TP 15
[EROFS]
The name would reside on a read-only file system.
.TP 15
[EISDIR]
A null pathname was specified.
.SH See Also
connect(2), getsockname(2), listen(2), socket(2), unlink(2)