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ecore_file_monitor: add kevent backend. 

Summary:
This is a very simple kevent backend, very similar to the eio_monitor
implementation. On BSD systems, some core features within in E and
other applications are always using the poll engine, which is not
ideal.  This is better, and simpler.

Reviewers: devilhorns, raster, bu5hm4n, vtorri

Reviewed By: vtorri

Subscribers: vtorri, cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D12239
This commit is contained in:
Alastair Poole 2021-01-31 14:45:46 +00:00
parent 39c305cf86
commit 44425e7489
2 changed files with 292 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

290
src/lib/ecore_file/ecore_file_monitor_kevent.c Normal file
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@ -0,0 +1,290 @@
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/types.h>
#include <sys/event.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "ecore_file_private.h"
#define KEVENT_NUM_EVENTS 5
typedef struct _Ecore_File_Monitor_Kevent Ecore_File_Monitor_Kevent;
#define ECORE_FILE_MONITOR_KEVENT(x) ((Ecore_File_Monitor_Kevent *)(x))
struct _Ecore_File_Monitor_Kevent
{
Ecore_File_Monitor monitor;
Eina_List *prev;
int fd;
};
typedef struct _File_Info File_Info;
struct _File_Info
{
const char *path;
Eina_Stat st;
};
static Ecore_Fd_Handler *_kevent_fdh = NULL;
static Eina_Hash *_kevent_monitors = NULL;
static Eina_Bool _ecore_file_monitor_kevent_handler(void *data, Ecore_Fd_Handler *fdh);
static int _ecore_file_monitor_kevent_monitor(Ecore_File_Monitor *em, const char *path);
static void _ecore_file_monitor_kevent_find(Ecore_File_Monitor *em);
static void _ecore_file_monitor_kevent_hash_del_cb(void *data);
static Eina_List * _ecore_file_monitor_kevent_ls(const char *directory);
static void _ecore_file_monitor_kevent_ls_free(Eina_List *);
int
ecore_file_monitor_backend_init(void)
{
int fd;
if (_kevent_fdh != NULL) return 0;
fd = kqueue();
if (fd < 0)
return 0;
_kevent_fdh = ecore_main_fd_handler_add(fd, ECORE_FD_READ, _ecore_file_monitor_kevent_handler,
NULL, NULL, NULL);
if (!_kevent_fdh)
{
close(fd);
return 0;
}
_kevent_monitors = eina_hash_int32_new(_ecore_file_monitor_kevent_hash_del_cb);
return 1;
}
int
ecore_file_monitor_backend_shutdown(void)
{
int fd;
if (!_kevent_fdh) return 1;
eina_hash_free(_kevent_monitors);
fd = ecore_main_fd_handler_fd_get(_kevent_fdh);
ecore_main_fd_handler_del(_kevent_fdh);
_kevent_fdh = NULL;
if (fd != -1)
close(fd);
return 1;
}
Ecore_File_Monitor *
ecore_file_monitor_backend_add(const char *path,
void (*func) (void *data, Ecore_File_Monitor *em,
Ecore_File_Event event,
const char *path),
void *data)
{
Ecore_File_Monitor *em;
char *path2;
size_t len;
if (!path) return NULL;
if (!func) return NULL;
em = (Ecore_File_Monitor *)calloc(1, sizeof(Ecore_File_Monitor_Kevent));
if (!em) return NULL;
em->func = func;
em->data = data;
len = strlen(path);
path2 = alloca(len + 1);
strcpy(path2, path);
if (path2[len - 1] == '/' && strcmp(path2, "/")) path2[len - 1] = 0;
em->path = eina_stringshare_add(path2);
if (!_ecore_file_monitor_kevent_monitor(em, em->path))
return NULL;
return em;
}
static Eina_List *
_ecore_file_monitor_kevent_ls(const char *directory)
{
Eina_Iterator *it;
Eina_File_Direct_Info *info;
Eina_List *files = NULL;
it = eina_file_direct_ls(directory);
if (!it) return NULL;
EINA_ITERATOR_FOREACH(it, info)
{
File_Info *file = malloc(sizeof(File_Info));
if (eina_file_statat(eina_iterator_container_get(it), info, &file->st))
{
free(file);
continue;
}
file->path = eina_stringshare_add(info->path);
files = eina_list_append(files, file);
}
eina_iterator_free(it);
return files;
}
static void
_ecore_file_monitor_kevent_ls_free(Eina_List *list)
{
File_Info *file;
EINA_LIST_FREE(list, file)
{
eina_stringshare_del(file->path);
free(file);
}
}
static void
_ecore_file_monitor_kevent_hash_del_cb(void *data)
{
Ecore_File_Monitor *em = data;
if (ECORE_FILE_MONITOR_KEVENT(em)->fd >= 0)
close(ECORE_FILE_MONITOR_KEVENT(em)->fd);
eina_stringshare_del(em->path);
_ecore_file_monitor_kevent_ls_free(ECORE_FILE_MONITOR_KEVENT(em)->prev);
free(em);
}
void
ecore_file_monitor_backend_del(Ecore_File_Monitor *em)
{
eina_hash_del(_kevent_monitors, &(ECORE_FILE_MONITOR_KEVENT(em)->fd), em);
}
static Eina_Bool
_ecore_file_monitor_kevent_handler(void *data EINA_UNUSED, Ecore_Fd_Handler *fdh)
{
Ecore_File_Monitor *em;
struct kevent evs[KEVENT_NUM_EVENTS];
int fd;
const struct timespec timeout = { 0, 0 };
fd = ecore_main_fd_handler_fd_get(fdh);
if (fd < 0) return ECORE_CALLBACK_RENEW;
int res = kevent(fd, 0, 0, evs, KEVENT_NUM_EVENTS, &timeout);
for (int i = 0; i < res; i++)
{
em = eina_hash_find(_kevent_monitors, &evs[i].ident);
if (evs[i].fflags & NOTE_DELETE)
{
em->func(em->data, em, ECORE_FILE_EVENT_DELETED_SELF, em->path);
}
if ((evs[i].fflags & NOTE_WRITE) || (evs[i].fflags & NOTE_ATTRIB))
{
_ecore_file_monitor_kevent_find(em);
}
}
return ECORE_CALLBACK_RENEW;
}
static void
_ecore_file_monitor_kevent_find(Ecore_File_Monitor *em)
{
Eina_List *l, *l2;
File_Info *file, *file2;
Eina_List *files;
files = _ecore_file_monitor_kevent_ls(em->path);
EINA_LIST_FOREACH(ECORE_FILE_MONITOR_KEVENT(em)->prev, l, file)
{
Eina_Bool exists = EINA_FALSE;
EINA_LIST_FOREACH(files, l2, file2)
{
if (file->st.ino == file2->st.ino)
{
if (file->path == file2->path)
exists = EINA_TRUE;
if (file->st.mtime != file2->st.mtime)
em->func(em->data, em, ECORE_FILE_EVENT_MODIFIED, file->path);
}
}
if (!exists)
{
if (S_ISDIR(file->st.mode))
em->func(em->data, em, ECORE_FILE_EVENT_DELETED_DIRECTORY, file->path);
else
em->func(em->data, em, ECORE_FILE_EVENT_DELETED_FILE, file->path);
}
}
EINA_LIST_FOREACH(files, l, file)
{
Eina_Bool exists = EINA_FALSE;
EINA_LIST_FOREACH(ECORE_FILE_MONITOR_KEVENT(em)->prev, l2, file2)
{
if ((file->path == file2->path) && (file->st.ino == file2->st.ino))
{
exists = EINA_TRUE;
break;
}
}
if (!exists)
{
if (S_ISDIR(file->st.mode))
em->func(em->data, em, ECORE_FILE_EVENT_CREATED_DIRECTORY, file->path);
else
em->func(em->data, em, ECORE_FILE_EVENT_CREATED_FILE, file->path);
}
}
_ecore_file_monitor_kevent_ls_free(ECORE_FILE_MONITOR_KEVENT(em)->prev);
ECORE_FILE_MONITOR_KEVENT(em)->prev = files;
}
static int
_ecore_file_monitor_kevent_monitor(Ecore_File_Monitor *em, const char *path)
{
struct kevent ev;
int fd, res = 0;
if ((!ecore_file_exists(path)) || (!ecore_file_is_dir(path)))
return 0;
fd = open(path, O_RDONLY);
if (fd < 0)
{
INF("open failed, %s", strerror(errno));
ecore_file_monitor_backend_del(em);
return 0;
}
eina_file_close_on_exec(fd, EINA_TRUE);
ECORE_FILE_MONITOR_KEVENT(em)->fd = fd;
ECORE_FILE_MONITOR_KEVENT(em)->prev = _ecore_file_monitor_kevent_ls(em->path);
eina_hash_direct_add(_kevent_monitors, &(ECORE_FILE_MONITOR_KEVENT(em)->fd), em);
EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR,
NOTE_DELETE | NOTE_WRITE | NOTE_ATTRIB, 0, NULL);
res = kevent(ecore_main_fd_handler_fd_get(_kevent_fdh), &ev, 1, 0, 0, 0);
if (res)
eina_hash_del(_kevent_monitors, &(ECORE_FILE_MONITOR_KEVENT(em)->fd), em);
return 1;
}

2
src/lib/ecore_file/meson.build
View File

@ -14,6 +14,8 @@ if sys_windows == true
ecore_file_src += files([ 'ecore_file_monitor_win32.c'])
elif sys_linux == true
ecore_file_src += files([ 'ecore_file_monitor_inotify.c'])
elif sys_bsd == true
ecore_file_src += files([ 'ecore_file_monitor_kevent.c'])
else
ecore_file_src += files([ 'ecore_file_monitor_poll.c'])
endif