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CONNECT(2) | System Calls Manual | CONNECT(2) |
NAME¶
connect
—
initiate a connection on a socket
LIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include
<sys/types.h>
#include
<sys/socket.h>
int
connect
(int
s, const struct
sockaddr *name,
socklen_t
namelen);
DESCRIPTION¶
The s argument is a socket. If it is of typeSOCK_DGRAM
, this call specifies the peer
with which the socket is to be associated; this address is that to which
datagrams are to be sent, and the only address from which datagrams are to be
received. If the socket is of type
SOCK_STREAM
, this call attempts to make a
connection to another socket. The other socket is specified by
name, which is an address in the
communications space of the socket. Each communications space interprets the
name argument in its own way. Generally,
stream sockets may successfully connect
()
only once; datagram sockets may use
connect
() multiple times to change their
association. Datagram sockets may dissolve the association by connecting to an
invalid address, such as a null address.
RETURN VALUES¶
Theconnect
() 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¶
Theconnect
() system call fails if:
- [
EBADF
] - The s argument is not a valid descriptor.
- [
EINVAL
] - The namelen argument is not a valid length for the address family.
- [
ENOTSOCK
] - The s argument is a descriptor for a file, not a socket.
- [
EADDRNOTAVAIL
] - The specified address is not available on this machine.
- [
EAFNOSUPPORT
] - Addresses in the specified address family cannot be used with this socket.
- [
EISCONN
] - The socket is already connected.
- [
ETIMEDOUT
] - Connection establishment timed out without establishing a connection.
- [
ECONNREFUSED
] - The attempt to connect was forcefully rejected.
- [
ECONNRESET
] - The connection was reset by the remote host.
- [
ENETUNREACH
] - The network is not reachable from this host.
- [
EHOSTUNREACH
] - The remote host is not reachable from this host.
- [
EADDRINUSE
] - The address is already in use.
- [
EFAULT
] - The name argument specifies an area outside the process address space.
- [
EINPROGRESS
] - The socket is non-blocking and the connection cannot be completed immediately. It is possible to select(2) for completion by selecting the socket for writing.
- [
EINTR
] - The connection attempt was interrupted by the delivery of a signal. The
connection will be established in the background, as in the case of
EINPROGRESS
. - [
EALREADY
] - A previous connection attempt has not yet been completed.
- [
EACCES
] - An attempt is made to connect to a broadcast address (obtained through the
INADDR_BROADCAST
constant or theINADDR_NONE
return value) through a socket that does not provide broadcast functionality. - [
EAGAIN
] - An auto-assigned port number was requested but no auto-assigned ports are available. Increasing the port range specified by sysctl(3) MIB variables net.inet.ip.portrange.first and net.inet.ip.portrange.last may alleviate the problem.
- [
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
] - The named socket does not exist.
- [
EACCES
] - Search permission is denied for a component of the path prefix.
- [
EACCES
] - Write access to the named socket is denied.
- [
ELOOP
] - Too many symbolic links were encountered in translating the pathname.
SEE ALSO¶
accept(2), getpeername(2), getsockname(2), select(2), socket(2), sysctl(3), sysctl(8)HISTORY¶
Theconnect
() system call appeared in
4.2BSD.June 26, 2014 | Debian |