#ifndef	_SYS_INOTIFY_H
#define	_SYS_INOTIFY_H	1

#include <stdint.h>

/* Structure describing an inotify event.  */
struct inotify_event
{
  int wd;		/* Watch descriptor.  */
  uint32_t mask;	/* Watch mask.  */
  uint32_t cookie;	/* Cookie to synchronize two events.  */
  uint32_t len;		/* Length (including NULs) of name.  */
  char name __flexarr;	/* Name.  */
};

/* the following are legal, implemented events that user-space can watch for */
#define IN_ACCESS		0x00000001	/* File was accessed */
#define IN_MODIFY		0x00000002	/* File was modified */
#define IN_ATTRIB		0x00000004	/* Metadata changed */
#define IN_CLOSE_WRITE		0x00000008	/* Writtable file was closed */
#define IN_CLOSE_NOWRITE	0x00000010	/* Unwrittable file closed */
#define IN_OPEN			0x00000020	/* File was opened */
#define IN_MOVED_FROM		0x00000040	/* File was moved from X */
#define IN_MOVED_TO		0x00000080	/* File was moved to Y */
#define IN_CREATE		0x00000100	/* Subfile was created */
#define IN_DELETE		0x00000200	/* Subfile was deleted */
#define IN_DELETE_SELF		0x00000400	/* Self was deleted */
#define IN_MOVE_SELF		0x00000800	/* Self was moved */

/* the following are legal events.  they are sent as needed to any watch */
#define IN_UNMOUNT		0x00002000	/* Backing fs was unmounted */
#define IN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */
#define IN_IGNORED		0x00008000	/* File was ignored */

/* helper events */
#define IN_CLOSE		(IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
#define IN_MOVE			(IN_MOVED_FROM | IN_MOVED_TO) /* moves */

/* special flags */
#define IN_ONLYDIR		0x01000000	/* only watch the path if it is a directory */
#define IN_DONT_FOLLOW		0x02000000	/* don't follow a sym link */
#define IN_MASK_ADD		0x20000000	/* add to the mask of an already existing watch */
#define IN_ISDIR		0x40000000	/* event occurred against dir */
#define IN_ONESHOT		0x80000000	/* only send event once */

/*
 * All of the events - we build the list by hand so that we can add flags in
 * the future and not break backward compatibility.  Apps will get only the
 * events that they originally wanted.  Be sure to add new events here!
 */
#define IN_ALL_EVENTS	(IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
			 IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
			 IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
			 IN_MOVE_SELF)

/* needed until Inotify! syscalls reach glibc */
#include <sys/syscall.h>
#ifndef __NR_inotify_init
#if defined(__i386__)
# define __NR_inotify_init	291
# define __NR_inotify_add_watch	292
# define __NR_inotify_rm_watch	293
#elif defined(__x86_64__)
# define __NR_inotify_init	253
# define __NR_inotify_add_watch	254
# define __NR_inotify_rm_watch	255
#else
#warning "inotify unsupported on this architecture!"
#endif
#endif /* __NR_inotify_init */

static inline int inotify_init(void)
{
	return syscall(__NR_inotify_init);
}

static inline int inotify_add_watch(int fd, const char *name, uint32_t mask)
{
	return syscall(__NR_inotify_add_watch, fd, name, mask);
}

static inline int inotify_rm_watch(int fd, uint32_t wd)
{
	return syscall(__NR_inotify_rm_watch, fd, wd);
}

#endif /* sys/inotify.h */