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/*
* Copyright (C) 2005-2009, Tobias Klauser <tklauser@distanz.ch>
*
* Licensed under the terms of the GNU General Public License; version 2 or later.
*/
#ifndef _INOTAIL_H
#define _INOTAIL_H
#include <sys/types.h>
#include <sys/inotify.h>
/* Number of items to tail. */
#define DEFAULT_N_LINES 10
/* inotify event buffer length for one file */
#define INOTIFY_BUFLEN (4 * sizeof(struct inotify_event))
/* inotify events to watch for on tailed files */
#define INOTAIL_WATCH_MASK \
(IN_MODIFY|IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT|IN_CREATE)
/* tail modes */
enum tail_mode { M_LINES, M_BYTES };
/* follow modes */
enum follow_mode {
FOLLOW_NONE = 0, /* Do not follow the file at all */
FOLLOW_DESCRIPTOR, /* Follow the file by fd */
FOLLOW_NAME /* Follow the file by name */
};
/* Every tailed file is represented as a file_struct */
struct file_struct {
char *name; /* Name of file (or '-' for stdin) */
int fd; /* File descriptor (or -1 if file is not open) */
off_t size; /* File size */
blksize_t blksize; /* Blocksize for filesystem I/O */
unsigned ignore; /* Whether to ignore the file in further processing */
int i_watch; /* Inotify watch associated with file_struct */
};
#define IS_PIPELIKE(mode) \
(S_ISFIFO(mode) || S_ISSOCK(mode))
/* inotail works on these file types */
#define IS_TAILABLE(mode) \
(S_ISREG(mode) || IS_PIPELIKE(mode) || S_ISCHR(mode))
#define is_digit(c) ((c) >= '0' && (c) <= '9')
#ifdef __GNUC__
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
#else
# define likely(x) (x)
# define unlikely(x) (x)
#endif /* __GNUC__ */
#ifdef DEBUG
# define dprintf(fmt, args...) fprintf(stderr, fmt, ##args)
#else
# define dprintf(fmt, args...)
#endif /* DEBUG */
#endif /* _INOTAIL_H */
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