listen(2)                     System Calls Manual                    listen(2)

JMENO
       listen - cekej na spojeni na soketu

KNIHOVNA
       Standardni knihovna C (libc, -lc)

POUZITI
       #include <sys/socket.h>

       int listen(int sockfd, int backlog);

POPIS
       Funkce listen() oznaci soket specifikovany parametrem sockfd jako
       pasivni, to znamena, ze soket bude pouzit pro prijeti pozadavku
       prichozich spojeni pomoci funkce accept(2).

       Parametr sockfd je file deskriptor, ktery popisuje soket, ktery je typu
       SOCK_STREAM nebo SOCK_SEQPACKET.

       Parametr backlog specifikuje maximalni delku, do ktere fronta
       cekajicich pozadavku na spojeni prostrednictvim sockfd muze dorust.
       Je-li fronta zaplnena, obdrzi klient zpravu ECONNREFUSED nebo pokud to
       nizsi vrstva podporuje znovuzaslani, pozadavek muze byt ignorovan a
       pozdejsi pokus o spojeni uspeje.

NAVRATOVE HODNOTY
       On success, zero is returned.  On error, -1 is returned, and errno is
       set to indicate the error.

CHYBOVE STAVY
       EADDRINUSE
              Jiny soket uz nasloucha na danem portu.

       EADDRINUSE
              (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).

       EBADF  Argument sockfd neni platnym deskriptorem.

       ENOTSOCK
              The file descriptor sockfd does not refer to a socket.

       EOPNOTSUPP
              Typ soketu neni podporovan volanim listen.

STANDARDY
       POSIX.1-2008.

HISTORIE
       POSIX.1-2001, 4.4BSD (first appeared in 4.2BSD).

POZNAMKY
       K prijeti spojeni jsou provedeny tyto kroky:

           (1)  Je vytvoren soket pomoci socket(2).

           (2)  Soket je navazan na lokalni adresu pomoci bind(2), takze dalsi
                sokety na nej mohou byt napojeny pomoci connect(2).

           (3)  Ochota k prijeti prichoziho spojeni a limit pro delku fronty
                jsou specifikovany pomoci listen().

           (4)  Spojeni je prijato pomoci accept(2).

       The behavior of the backlog argument on TCP sockets changed with Linux
       2.2.  Now it specifies the queue length for completely established
       sockets waiting to be accepted, instead of the number of incomplete
       connection requests.  The maximum length of the queue for incomplete
       sockets can be set using /proc/sys/net/ipv4/tcp_max_syn_backlog.  When
       syncookies are enabled there is no logical maximum length and this
       setting is ignored.  See tcp(7)  for more information.

       If the backlog argument is greater than the value in
       /proc/sys/net/core/somaxconn, then it is silently capped to that value.
       Since Linux 5.4, the default in this file is 4096; in earlier kernels,
       the default value is 128.  Before Linux 2.4.25, this limit was a hard
       coded value, SOMAXCONN, with the value 128.

PRIKLADY
       Viz bind(2).

DALSI INFORMACE
       accept(2), bind(2), connect(2), socket(2), socket(7)

PREKLAD
       Preklad teto prirucky do spanelstiny vytvorili Pavel Heimlich
       <tropikhajma@gmail.com>

       Tento preklad je bezplatna dokumentace; Prectete si GNU General Public
       License Version 3 <https://www.gnu.org/licenses/gpl-3.0.html> nebo
       novejsi ohledne podminek autorskych prav. Neexistuje ZADNA ODPOVEDNOST.

       Pokud narazite na nejake chyby v prekladu teto prirucky, poslete e-mail
       na adresu <translation-team-cs@lists.sourceforge.net>.

Linux man-pages 6.06           31. rijna 2023                        listen(2)