ACCEPT(2)                  Linux Programmer's Manual                 ACCEPT(2)



NAME <?><?>
       accept - <?><?><?><?><?><?><?><?><?><?><?><?><?>

SYNOPSIS <?><?>
       #include <sys/types.h>
       #include <sys/socket.h>

       int accept(int s, struct sockaddr *addr, socklen_t *addrlen);

DESCRIPTION <?><?>
       accept <?><?><?><?><?><?><?><?><?><?><?><?> (SOCK_STREAM,
       SOCK_SEQPACKET <?> SOCK_RDM).
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?>
       s
       <?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?><?>.<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.<?>
       <?><?><?> s
       <?><?><?><?><?><?><?><?>.<?><?><?><?><?><?><?><?><?><?><?><?><?>
       (<?><?><?><?><?> fcntl<?><?><?> F_SETFL
       <?><?><?><?>,<?><?><?><?><?><?><?><?><?><?><?><?>)<?><?><?> accept.
       <?><?><?>.

       <?><?> s <?><?> socket(2) <?><?>,<?> bind(2)
       <?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?> listen(2).
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?>.  <?><?> addr
       <?><?><?><?><?><?><?>sockaddr<?><?><?>.<?><?><?><?><?><?><?><?><?><?><?><?><?><?>.
       <?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?><?>.<?><?> addr
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.
       (<?><?> socket(2) <?><?><?><?><?><?><?><?><?><?>).  addrlen
       <?><?><?><?><?><?><?>: <?><?><?><?><?><?><?><?><?><?><?><?><?><?> addr
       <?><?><?><?><?><?><?>;<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?>.<?> addr
       <?><?>NULL<?><?><?><?>,addrlen<?><?><?><?><?>NULL.

       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?><?><?><?><?><?>,
       accept
       <?><?><?><?><?><?><?><?><?><?><?>.<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>, accept <?><?><?>EAGAIN.

       <?><?> select(2) <?><?> poll(2).
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.<?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?> accept
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?>.<?><?>,<?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> SIGIO; <?><?><?><?><?> socket(7)

       <?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?> DECNet, accept
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.<?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?>.<?><?><?>Linux<?><?><?>DECNet<?><?><?> <?><?><?>.

NOTES <?><?>
       <?><?><?><?><?><?> SIGIO <?><?><?><?> select(2) <?> poll(2)
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?>
       accept
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.<?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.<?><?><?> accept
       <?><?><?><?><?><?>,<?><?><?><?><?><?> s <?><?><?> O_NONBLOCK
       <?><?>(<?><?> socket(7)).

RETURN VALUE <?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>-1.<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?>.

ERROR HANDLING <?><?><?><?>
       Linux accept <?><?><?><?><?><?><?><?><?><?><?><?><?><?> accept
       <?><?><?><?><?><?><?> .
       <?><?><?><?><?><?><?><?><?><?><?><?>BSD<?><?><?><?><?>.<?><?><?><?><?>,<?><?><?><?>
       <?><?><?><?><?> accept
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?>,<?><?>
       EAGAIN <?><?>.<?><?>TCP/IP<?><?><?><?><?><?><?> ENETDOWN, EPROTO,
       ENOPROTOOPT, EHOSTDOWN, ENONET, EHOSTUNREACH, EOPNOTSUPP, <?><?>
       ENETUNREACH.

ERRORS <?><?>
       EAGAIN<?><?>EWOULDBLOCK
              <?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?><?><?><?>.

       EBADF  <?><?><?><?><?>.

       ENOTSOCK
              <?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?><?>.

       EOPNOTSUPP
              <?><?><?><?><?><?><?><?><?><?> SOCK_STREAM.  <?><?>

       EFAULT <?><?> addr <?><?><?><?><?><?><?><?><?><?><?><?>.

       EPERM  <?><?><?><?><?><?><?><?><?>.

       ENOBUFS,ENOMEM
              <?><?><?><?><?><?>.
              <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,
              <?><?><?><?><?><?><?><?><?>.

       <?><?>,<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.
       <?><?><?>Linux<?><?><?><?><?><?><?><?><?><?><?> EMFILE, EINVAL, ENOSR,
       ENOBUFS, EPERM, ECONNABORTED, ESOCKTNOSUPPORT, EPROTONOSUPPORT,
       ETIMEDOUT, ERESTARTSYS.

CONFORMING TO <?><?><?>
       SVr4,4.4BSD( accept <?><?><?><?><?><?><?>BSD 4.2).
       BSD<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> (EBADF,
       ENOTSOCK, EOPNOTSUPP, EWOULDBLOCK, EFAULT).
       SUSv2<?><?><?><?><?><?>EAGAIN, EBADF, ECONNABORTED, EFAULT, EINTR,
       EINVAL, EMFILE, ENFILE, ENOBUFS, ENOMEM, ENOSR, ENOTSOCK, EOPNOTSUPP,
       EPROTO, EWOULDBLOCK.

       Linux accept<?><?><?><?> O_NONBLOCK <?><?><?><?><?><?><?><?>.
       <?><?><?><?><?><?><?><?><?>BSD<?><?><?><?><?>.
       <?><?>,<?><?><?><?><?>accept<?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

NOTE <?><?>
       <?><?> accept <?><?><?><?><?><?><?><?><?><?><?><?>'int
       *'(<?>libc4<?>libc5<?><?><?><?><?><?><?><?><?>, <?><?>BSD 4.*,SunOS 4,
       SGI);POSIX 1003.1g<?><?><?><?><?><?><?><?><?> `size_t *',SunOS
       5<?><?><?><?><?><?>.  <?><?><?>POSIX<?><?><?>Single Unix
       Specification<?><?>glibc2<?><?><?> `socklen_t *'.  Quoting Linus
       Torvalds: <?><?>Linus Torvalds
       (<?><?>:<?><?><?><?><?><?>Linux<?><?><?><?>,<?><?><?><?><?><?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?>): I fails: only italicizes a single line _Any_
       sane library _must_ have "socklen_t" be the same size as int.  Anything
       else breaks any BSD socket layer stuff.  POSIX initially _did_ make it
       a size_t, and I (and hopefully others, but obviously not too many)
       complained to them very loudly indeed.  Making it a size_t is
       completely broken, exactly because size_t very seldom is the same size
       as "int" on 64-bit architectures, for example.  And it _has_ to be the
       same size as "int" because that's what the BSD socket interface is.
       Anyway, the POSIX people eventually got a clue, and created
       "socklen_t".  They shouldn't have touched it in the first place, but
       once they did they felt it had to have a named type for some
       unfathomable reason (probably somebody didn't like losing face over
       having done the original stupid thing, so they silently just renamed
       their blunder).

       <?><?><?><?>"socklen_t"<?>int<?><?><?><?><?><?><?><?><?>.<?><?><?><?><?><?>
       BSD<?><?><?><?><?><?><?>.POSIX<?><?><?><?><?><?><?><?>size_t, Linus
       Torvalds(<?><?><?><?><?><?><?><?>,<?><?><?><?><?><?><?>)
       <?><?><?><?><?><?><?><?><?>size_t<?><?><?><?><?><?>,<?><?><?>64<?><?><?><?>
       size_t<?>int<?><?><?><?><?><?><?><?>,<?><?><?><?><?>(<?><?><?>accept<?><?>
       <?><?><?><?><?>)<?><?><?><?><?><?>int<?><?>,<?><?><?><?>BSD<?><?><?><?><?>
       <?><?>.<?><?>POSIX<?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?><?><?>
       <?><?><?><?><?><?>"socklen_t".Linux Torvalds<?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>,<?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>.

SEE ALSO <?><?>
       bind(2), connect(2), listen(2), select(2), socket(2)


[<?><?><?><?><?><?>]
       byeyear <love_my_love@263.net >

[<?><?><?><?><?><?><?>]
       2002.01.27

<?><?><?>linux<?><?>man<?><?><?><?><?><?><?><?>:
       http://cmpp.linuxforum.net

<?>
       <?><?><?><?><?><?><?><?><?> man <?><?><?><?><?><?><?><?>
       <?><?> man <?><?><?><?><?><?>https://github.com/man-pages-zh/manpages-
       zh

Linux 2.2 Page                    7 May 1999                         ACCEPT(2)