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