connect(2) System Calls Manual connect(2) NOMBRE connect - inicia una conexion en un conector (socket) BIBLIOTECA Biblioteca Estandar C (libc, -lc) SINOPSIS #include int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen); DESCRIPCION The connect() system call connects the socket referred to by the file descriptor sockfd to the address specified by addr. The addrlen argument specifies the size of addr. The format of the address in addr is determined by the address space of the socket sockfd; see socket(2) for further details. If the socket sockfd is of type SOCK_DGRAM, then addr is the address to which datagrams are sent by default, and the only address from which datagrams are received. If the socket is of type SOCK_STREAM or SOCK_SEQPACKET, this call attempts to make a connection to the socket that is bound to the address specified by addr. Some protocol sockets (e.g., UNIX domain stream sockets) may successfully connect() only once. Some protocol sockets (e.g., datagram sockets in the UNIX and Internet domains) may use connect() multiple times to change their association. Some protocol sockets (e.g., TCP sockets as well as datagram sockets in the UNIX and Internet domains) may dissolve the association by connecting to an address with the sa_family member of sockaddr set to AF_UNSPEC; thereafter, the socket can be connected to another address. (AF_UNSPEC is supported since Linux 2.2.) VALOR DEVUELTO Si la conexion o enlace tiene exito, se devuelve 0. En caso de error, se devuelve -1, y se asigna a la variable errno un valor apropiado. ERRORES Los siguientes solo son errores generales de conector. Puede haber otros codigos de error especificos del dominio. EACCES For UNIX domain sockets, which are identified by pathname: Write permission is denied on the socket file, or search permission is denied for one of the directories in the path prefix. (See also path_resolution(7).) EACCES EPERM El usuario ha intentado conectarse a una direccion de difusion (broadcast) sin que el conector tenga activa la opcion de difusion, o la peticion de conexion ha fallado debido a una regla del cortafuegos local. EACCES It can also be returned if an SELinux policy denied a connection (for example, if there is a policy saying that an HTTP proxy can only connect to ports associated with HTTP servers, and the proxy tries to connect to a different port). EADDRINUSE La direccion local ya esta en uso. EADDRNOTAVAIL (Internet domain sockets) The socket referred to by sockfd had not previously been bound to an address and, upon attempting to bind it to an ephemeral port, it was determined that all port numbers in the ephemeral port range are currently in use. See the discussion of /proc/sys/net/ipv4/ip_local_port_range in ip(7). EAFNOSUPPORT La direccion pasada no tiene la familia de direcciones correcta en su campo sa_family. EAGAIN For nonblocking UNIX domain sockets, the socket is nonblocking, and the connection cannot be completed immediately. For other socket families, there are insufficient entries in the routing cache. EALREADY El conector es no bloqueante y todavia no se ha terminado un intento de conexion anterior. EBADF sockfd no es descriptor valido de archivos abiertos. ECONNREFUSED Un connect() en un conector de flujo, no ha econtrado a nadie a la esucha en la direccion remota. EFAULT La estructura de direccion del conector esta fuera del espacio de direcciones del usuario. EINPROGRESS The socket is nonblocking and the connection cannot be completed immediately. (UNIX domain sockets failed with EAGAIN instead.) It is possible to select(2) or poll(2) for completion by selecting the socket for writing. After select(2) indicates writability, use getsockopt(2) to read the SO_ERROR option at level SOL_SOCKET to determine whether connect() completed successfully (SO_ERROR is zero) or unsuccessfully (SO_ERROR is one of the usual error codes listed here, explaining the reason for the failure). EINTR La senal atrapada ha interrumpido la llamada del sistema; consulte signal(7). EISCONN El conector ya esta conectado. ENETUNREACH Red inaccesible. ENOTSOCK El descriptor de archivo sockfd no se refiere a un conector. EPROTOTYPE The socket type does not support the requested communications protocol. This error can occur, for example, on an attempt to connect a UNIX domain datagram socket to a stream socket. ETIMEDOUT Finalizo el plazo de tiempo mientras se intentaba la conexion. El servidor puede estar demasiado ocupado para aceptar nuevas conexiones. Dese cuenta que para conectores IP el plazo de tiempo puede ser muy largo cuando se han habilitado los "syncookies" en el servidor. ESTANDARES POSIX.1-2008. HISTORIAL POSIX.1-2001, SVr4, 4.4BSD, (connect() first appeared in 4.2BSD). NOTAS If connect() fails, consider the state of the socket as unspecified. Portable applications should close the socket and create a new one for reconnecting. EJEMPLOS En getaddrinfo(3) tiene un ejemplo del uso de connect(). VEASE TAMBIEN accept(2), bind(2), getsockname(2), listen(2), socket(2), path_resolution(7), selinux(8) TRADUCCION La traduccion al espanol de esta pagina del manual fue creada por Miguel Angel Sepulveda , Cesar D. Lobejon , Juan Piernas y Marcos Fouces Esta traduccion es documentacion libre; lea la GNU General Public License Version 3 o posterior con respecto a las condiciones de copyright. No existe NINGUNA RESPONSABILIDAD. Si encuentra algun error en la traduccion de esta pagina del manual, envie un correo electronico a . Paginas de Manual de Linux 6.8 2 Mayo 2024 connect(2)