1 files changed, 82 insertions, 0 deletions
diff --git a/lib/sh/netconn.c b/lib/sh/netconn.c
new file mode 100644
index 0000000..e20f104
--- /dev/null
+++ b/lib/sh/netconn.c
@@ -0,0 +1,82 @@
+/* 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_SYS_SOCKET_H) && 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 || errno == EBADF)) ? 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__ */
+}