1 files changed, 148 insertions, 0 deletions
diff --git a/misc-utils/lsfd-decode-file-flags.c b/misc-utils/lsfd-decode-file-flags.c
new file mode 100644
index 0000000..bd87c7d
--- /dev/null
+++ b/misc-utils/lsfd-decode-file-flags.c
@@ -0,0 +1,148 @@
+/*
+ * lsfd(1) - list file descriptors
+ *
+ * Copyright (C) 2022 Red Hat, Inc. All rights reserved.
+ * Written by Masatake YAMATO <yamato@redhat.com>
+ *
+ * Very generally based on lsof(8) by Victor A. Abell <abe@purdue.edu>
+ * It supports multiple OSes. lsfd specializes to Linux.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/* lsfd_decode_file_flags() is for decoding `flags' field of
+ * /proc/$pid/fdinfo/$fd. Bits of the field have name defined
+ * in fctl.h.
+ * A system on which lsfd is built may have multiple
+ * fctl.h files:
+ *
+ * - /usr/include/asm/fcntl.h         (a part of Linux kernel)
+ * - /usr/include/asm-generic/fcntl.h (a part of Linux kernel)
+ * - /usr/include/fcntl.h             (a part of glibc)
+ * - /usr/include/bits/fcntl.h        (a part of glibc)
+ *
+ * For decoding purpose, /usr/include/asm/fcntl.h or
+ * /usr/include/asm-generic/fcntl.h is needed.
+ *
+ * /usr/include/bits/fcntl.h and /usr/include/fcntl.h are
+ * not suitable for decoding. They should not be included.
+ * /usr/include/fcntl.h includes /usr/include/bits/fcntl.h.
+ */
+
+#if defined HAVE_ASM_FCNTL_H
+#include <asm/fcntl.h>
+#elif defined HAVE_ASM_GENERIC_FCNTL_H
+#include <asm-generic/fcntl.h>
+#else
+#error "kernel's fcntl.h is not available"
+#endif
+
+#include <stddef.h>		/* for size_t */
+struct ul_buffer;
+
+void lsfd_decode_file_flags(struct ul_buffer *buf, int flags);
+
+/* We cannot include buffer.h because buffer.h includes
+ * /usr/include/fcntl.h indirectly. */
+extern int ul_buffer_is_empty(struct ul_buffer *buf);
+extern int ul_buffer_append_data(struct ul_buffer *buf, const char *data, size_t sz);
+extern int ul_buffer_append_string(struct ul_buffer *buf, const char *str);
+
+void lsfd_decode_file_flags(struct ul_buffer *buf, int flags)
+{
+#define SET_FLAG_FULL(L,s)						\
+	do {								\
+		if (flags & (L)) {					\
+			if (!ul_buffer_is_empty(buf))			\
+				ul_buffer_append_data(buf, ",", 1);	\
+			ul_buffer_append_string(buf, #s);		\
+		}							\
+	} while (0)
+
+#define SET_FLAG(L,s) SET_FLAG_FULL(O_##L,s)
+
+#ifdef O_WRONLY
+	SET_FLAG(WRONLY,wronly);
+#endif
+
+#ifdef O_RDWR
+	SET_FLAG(RDWR,rdwr);
+#endif
+
+#ifdef O_CREAT
+	SET_FLAG(CREAT,creat);
+#endif
+
+#ifdef O_EXCL
+	SET_FLAG(EXCL,excl);
+#endif
+
+#ifdef O_NOCTTY
+	SET_FLAG(NOCTTY,noctty);
+#endif
+
+#ifdef O_APPEND
+	SET_FLAG(APPEND,append);
+#endif
+
+#ifdef O_NONBLOCK
+	SET_FLAG(NONBLOCK,nonblock);
+#endif
+
+#ifdef O_DSYNC
+	SET_FLAG(DSYNC,dsync);
+#endif
+
+#ifdef FASYNC
+	SET_FLAG_FULL(FASYNC,fasync);
+#endif
+
+#ifdef O_DIRECT
+	SET_FLAG(DIRECT,direct);
+#endif
+
+#ifdef O_LARGEFILE
+	SET_FLAG(LARGEFILE,largefile);
+#endif
+
+#ifdef O_DIRECTORY
+	SET_FLAG(DIRECTORY,directory);
+#endif
+
+#ifdef O_NOFOLLOW
+	SET_FLAG(NOFOLLOW,nofollow);
+#endif
+
+#ifdef O_NOATIME
+	SET_FLAG(NOATIME,noatime);
+#endif
+
+#ifdef O_CLOEXEC
+	SET_FLAG(CLOEXEC,cloexec);
+#endif
+
+#ifdef __O_SYNC
+	SET_FLAG_FULL(__O_SYNC,_sync);
+#endif
+
+#ifdef O_PATH
+	SET_FLAG(PATH,path);
+#endif
+
+#ifdef __O_TMPFILE
+	SET_FLAG_FULL(__O_TMPFILE,_tmpfile);
+#endif
+
+}