?? netconn.c
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/* netconn.c -- is a particular file descriptor a network connection?. *//* Copyright (C) 2002-2005 Free Software Foundation, Inc. This file is part of GNU Bash, the Bourne Again SHell. Bash is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Bash is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Bash. If not, see <http://www.gnu.org/licenses/>.*/#include <config.h>#include <bashtypes.h>#if ! defined(_MINIX) && defined (HAVE_SYS_FILE_H)# include <sys/file.h>#endif#include <posixstat.h>#include <filecntl.h>#include <errno.h>#if defined (HAVE_UNISTD_H)# include <unistd.h>#endif/* The second and subsequent conditions must match those used to decide whether or not to call getpeername() in isnetconn(). */#if defined (HAVE_SYS_SOCKET_H) && defined (HAVE_GETPEERNAME) && !defined (SVR4_2)# include <sys/socket.h>#endif/* Is FD a socket or network connection? */intisnetconn (fd) int fd;{#if defined (HAVE_GETPEERNAME) && !defined (SVR4_2) && !defined (__BEOS__) int rv; socklen_t l; struct sockaddr sa; l = sizeof(sa); rv = getpeername(fd, &sa, &l); /* Posix.2 says getpeername can return these errors. */ return ((rv < 0 && (errno == ENOTSOCK || errno == ENOTCONN || errno == EINVAL)) ? 0 : 1);#else /* !HAVE_GETPEERNAME || SVR4_2 || __BEOS__ */# if defined (SVR4) || defined (SVR4_2) /* Sockets on SVR4 and SVR4.2 are character special (streams) devices. */ struct stat sb; if (isatty (fd)) return (0); if (fstat (fd, &sb) < 0) return (0);# if defined (S_ISFIFO) if (S_ISFIFO (sb.st_mode)) return (0);# endif /* S_ISFIFO */ return (S_ISCHR (sb.st_mode));# else /* !SVR4 && !SVR4_2 */# if defined (S_ISSOCK) && !defined (__BEOS__) struct stat sb; if (fstat (fd, &sb) < 0) return (0); return (S_ISSOCK (sb.st_mode));# else /* !S_ISSOCK || __BEOS__ */ return (0);# endif /* !S_ISSOCK || __BEOS__ */# endif /* !SVR4 && !SVR4_2 */#endif /* !HAVE_GETPEERNAME || SVR4_2 || __BEOS__ */}
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