[PATCH] libc/sysdeps/linux/common/isfdtype.c: add support for isfdtype()
Anthony G. Basile
basile at opensource.dyc.edu
Sun Jul 28 13:08:34 UTC 2013
From: "Anthony G. Basile" <blueness at gentoo.org>
isfdtype(int fd, int fdtype) check whether a file descriptor fd is
of type fdtype, where the types are defined in stat(2). It is
supported in glibc and BSD, and used by utilities such as acpid.
Signed-off-by: Anthony G. Basile <blueness at gentoo.org>
---
include/sys/socket.h | 1 +
libc/sysdeps/linux/common/isfdtype.c | 43 ++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
create mode 100644 libc/sysdeps/linux/common/isfdtype.c
diff --git a/include/sys/socket.h b/include/sys/socket.h
index 8642312..a9d5804 100644
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -261,6 +261,7 @@ extern int sockatmark (int __fd) __THROW;
returns 1 if FD is open on an object of the indicated type, 0 if not,
or -1 for errors (setting errno). */
extern int isfdtype (int __fd, int __fdtype) __THROW;
+libc_hidden_proto(isfdtype)
#endif
__END_DECLS
diff --git a/libc/sysdeps/linux/common/isfdtype.c b/libc/sysdeps/linux/common/isfdtype.c
new file mode 100644
index 0000000..500b5f2
--- /dev/null
+++ b/libc/sysdeps/linux/common/isfdtype.c
@@ -0,0 +1,43 @@
+/* Determine whether descriptor has given property.
+ Copyright (C) 1996-2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+int
+isfdtype (int fildes, int fdtype)
+{
+#ifdef __USE_MISC
+ struct stat64 st;
+ int result;
+
+ {
+ int save_error = errno;
+ result = fstat64 (fildes, &st);
+ __set_errno (save_error);
+ }
+
+ return result ?: (st.st_mode & S_IFMT) == (mode_t) fdtype;
+#else
+ __set_errno (ENOSYS);
+ return -1;
+#endif
+}
+libc_hidden_def(isfdtype)
--
1.8.1.5
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