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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? */
int
isnetconn (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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