82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/*++
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/* NAME
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/* sane_accept 3
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/* SUMMARY
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/* sanitize accept() error returns
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/* SYNOPSIS
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/* #include <sane_accept.h>
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/*
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/* int sane_accept(sock, buf, len)
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/* int sock;
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/* struct sockaddr *buf;
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/* SOCKADDR_SIZE *len;
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/* DESCRIPTION
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/* sane_accept() implements the accept(2) socket call, and maps
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/* known harmless error results to EAGAIN.
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/* BUGS
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/* Bizarre systems may have other harmless error results. Such
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/* systems encourage programers to ignore error results, and
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/* penalizes programmers who code defensively.
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include "sys_defs.h"
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#include <sys/socket.h>
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#include <errno.h>
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/* Utility library. */
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#include "sane_accept.h"
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/* sane_accept - sanitize accept() error returns */
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int sane_accept(int sock, struct sockaddr * sa, SOCKADDR_SIZE *len)
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{
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static int accept_ok_errors[] = {
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EAGAIN,
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ECONNREFUSED,
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ECONNRESET,
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EHOSTDOWN,
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EHOSTUNREACH,
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EINTR,
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ENETDOWN,
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ENETUNREACH,
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ENOTCONN,
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EWOULDBLOCK,
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0,
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};
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int count;
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int err;
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int fd;
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/*
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* XXX Solaris 2.4 accept() returns EPIPE when a UNIX-domain client has
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* disconnected in the mean time. From then on, UNIX-domain sockets are
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* hosed beyond recovery. There is no point treating this as a beneficial
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* error result because the program would go into a tight loop.
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*
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* XXX LINUX < 2.1 accept() wakes up before the three-way handshake is
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* complete, so it can fail with ECONNRESET and other "false alarm"
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* indications.
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*/
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if ((fd = accept(sock, sa, len)) < 0) {
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for (count = 0; (err = accept_ok_errors[count]) != 0; count++) {
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if (errno == err) {
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errno = EAGAIN;
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break;
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}
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}
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}
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return (fd);
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}
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