bind
—
bind a name to a socket
#include <sys/socket.h>
int
bind
(int
s, const struct sockaddr
*name, socklen_t
namelen);
bind
() assigns a name to an unnamed socket. When a
socket is created with
socket(2) it exists
in a name space (address family) but has no name assigned.
bind
() requests that
name be
assigned to the socket.
namelen indicates the amount of
space pointed to by
name, in bytes; the
sa_len member of
name is ignored.
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
unlink(2)).
The rules used in name binding vary between communication domains.
Consult the manual entries in section 4 for detailed information.
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable
errno is set to indicate the error.
The
bind
() function will fail if:
- [
EBADF
]
- s is not a valid descriptor.
- [
ENOTSOCK
]
- s is not a socket.
- [
EADDRNOTAVAIL
]
- The specified address is not available from the local machine.
- [
EADDRINUSE
]
- The specified address is already in use.
- [
EINVAL
]
- The socket is already bound to an address, or
namelen is not a valid length for the supplied
address.
- [
EAFNOSUPPORT
]
- The family of the socket and that requested in
name->sa_family are not equivalent.
- [
ENOBUFS
]
- Insufficient buffer space is available.
- [
EACCES
]
- The requested address is protected, and the current user has inadequate
permission to access it.
- [
EFAULT
]
- The name parameter is not in a valid part of the
user address space.
The following errors are specific to binding names in the
UNIX-domain.
- [
ENOTDIR
]
- A component of the path prefix is not a directory.
- [
ENAMETOOLONG
]
- A component of a pathname exceeded
NAME_MAX
characters, or an entire pathname (including the terminating NUL) exceeded
PATH_MAX
bytes.
- [
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.
- [
EROFS
]
- The name would reside on a read-only file system.
- [
EISDIR
]
- An empty pathname was specified.
connect(2),
getsockname(2),
listen(2),
socket(2)
The
bind
() function conforms to
IEEE
Std 1003.1-2008 (“POSIX.1”).
The
bind
() system call first appeared in
4.1cBSD.