linux: assume the presence of inotify system calls

This lets us get rid of the system call wrappers and simplify
the fs event watcher code a great deal.

All system calls were added well before 2.6.32, our baseline kernel.

PR-URL: https://github.com/libuv/libuv/pull/2665
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
This commit is contained in:
Ben Noordhuis 2020-02-04 16:36:59 +01:00
parent dfd64933d5
commit 24d73d065f
3 changed files with 20 additions and 152 deletions

View File

@ -29,6 +29,7 @@
#include <assert.h>
#include <errno.h>
#include <sys/inotify.h>
#include <sys/types.h>
#include <unistd.h>
@ -64,45 +65,17 @@ static void uv__inotify_read(uv_loop_t* loop,
static void maybe_free_watcher_list(struct watcher_list* w,
uv_loop_t* loop);
static int new_inotify_fd(void) {
int err;
int fd;
fd = uv__inotify_init1(UV__IN_NONBLOCK | UV__IN_CLOEXEC);
if (fd != -1)
return fd;
if (errno != ENOSYS)
return UV__ERR(errno);
fd = uv__inotify_init();
if (fd == -1)
return UV__ERR(errno);
err = uv__cloexec(fd, 1);
if (err == 0)
err = uv__nonblock(fd, 1);
if (err) {
uv__close(fd);
return err;
}
return fd;
}
static int init_inotify(uv_loop_t* loop) {
int err;
int fd;
if (loop->inotify_fd != -1)
return 0;
err = new_inotify_fd();
if (err < 0)
return err;
fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (fd < 0)
return UV__ERR(errno);
loop->inotify_fd = err;
loop->inotify_fd = fd;
uv__io_init(&loop->inotify_read_watcher, uv__inotify_read, loop->inotify_fd);
uv__io_start(loop, &loop->inotify_read_watcher, POLLIN);
@ -186,7 +159,7 @@ static void maybe_free_watcher_list(struct watcher_list* w, uv_loop_t* loop) {
if ((!w->iterating) && QUEUE_EMPTY(&w->watchers)) {
/* No watchers left for this path. Clean up. */
RB_REMOVE(watcher_root, CAST(&loop->inotify_watchers), w);
uv__inotify_rm_watch(loop->inotify_fd, w->wd);
inotify_rm_watch(loop->inotify_fd, w->wd);
uv__free(w);
}
}
@ -194,7 +167,7 @@ static void maybe_free_watcher_list(struct watcher_list* w, uv_loop_t* loop) {
static void uv__inotify_read(uv_loop_t* loop,
uv__io_t* dummy,
unsigned int events) {
const struct uv__inotify_event* e;
const struct inotify_event* e;
struct watcher_list* w;
uv_fs_event_t* h;
QUEUE queue;
@ -219,12 +192,12 @@ static void uv__inotify_read(uv_loop_t* loop,
/* Now we have one or more inotify_event structs. */
for (p = buf; p < buf + size; p += sizeof(*e) + e->len) {
e = (const struct uv__inotify_event*)p;
e = (const struct inotify_event*) p;
events = 0;
if (e->mask & (UV__IN_ATTRIB|UV__IN_MODIFY))
if (e->mask & (IN_ATTRIB|IN_MODIFY))
events |= UV_CHANGE;
if (e->mask & ~(UV__IN_ATTRIB|UV__IN_MODIFY))
if (e->mask & ~(IN_ATTRIB|IN_MODIFY))
events |= UV_RENAME;
w = find_watcher(loop, e->wd);
@ -290,16 +263,16 @@ int uv_fs_event_start(uv_fs_event_t* handle,
if (err)
return err;
events = UV__IN_ATTRIB
| UV__IN_CREATE
| UV__IN_MODIFY
| UV__IN_DELETE
| UV__IN_DELETE_SELF
| UV__IN_MOVE_SELF
| UV__IN_MOVED_FROM
| UV__IN_MOVED_TO;
events = IN_ATTRIB
| IN_CREATE
| IN_MODIFY
| IN_DELETE
| IN_DELETE_SELF
| IN_MOVE_SELF
| IN_MOVED_FROM
| IN_MOVED_TO;
wd = uv__inotify_add_watch(handle->loop->inotify_fd, path, events);
wd = inotify_add_watch(handle->loop->inotify_fd, path, events);
if (wd == -1)
return UV__ERR(errno);

View File

@ -34,46 +34,6 @@
# endif
#endif /* __arm__ */
#ifndef __NR_inotify_init
# if defined(__x86_64__)
# define __NR_inotify_init 253
# elif defined(__i386__)
# define __NR_inotify_init 291
# elif defined(__arm__)
# define __NR_inotify_init (UV_SYSCALL_BASE + 316)
# endif
#endif /* __NR_inotify_init */
#ifndef __NR_inotify_init1
# if defined(__x86_64__)
# define __NR_inotify_init1 294
# elif defined(__i386__)
# define __NR_inotify_init1 332
# elif defined(__arm__)
# define __NR_inotify_init1 (UV_SYSCALL_BASE + 360)
# endif
#endif /* __NR_inotify_init1 */
#ifndef __NR_inotify_add_watch
# if defined(__x86_64__)
# define __NR_inotify_add_watch 254
# elif defined(__i386__)
# define __NR_inotify_add_watch 292
# elif defined(__arm__)
# define __NR_inotify_add_watch (UV_SYSCALL_BASE + 317)
# endif
#endif /* __NR_inotify_add_watch */
#ifndef __NR_inotify_rm_watch
# if defined(__x86_64__)
# define __NR_inotify_rm_watch 255
# elif defined(__i386__)
# define __NR_inotify_rm_watch 293
# elif defined(__arm__)
# define __NR_inotify_rm_watch (UV_SYSCALL_BASE + 318)
# endif
#endif /* __NR_inotify_rm_watch */
#ifndef __NR_recvmmsg
# if defined(__x86_64__)
# define __NR_recvmmsg 299
@ -167,42 +127,6 @@
#endif /* __NR_getrandom */
int uv__inotify_init(void) {
#if defined(__NR_inotify_init)
return syscall(__NR_inotify_init);
#else
return errno = ENOSYS, -1;
#endif
}
int uv__inotify_init1(int flags) {
#if defined(__NR_inotify_init1)
return syscall(__NR_inotify_init1, flags);
#else
return errno = ENOSYS, -1;
#endif
}
int uv__inotify_add_watch(int fd, const char* path, uint32_t mask) {
#if defined(__NR_inotify_add_watch)
return syscall(__NR_inotify_add_watch, fd, path, mask);
#else
return errno = ENOSYS, -1;
#endif
}
int uv__inotify_rm_watch(int fd, int32_t wd) {
#if defined(__NR_inotify_rm_watch)
return syscall(__NR_inotify_rm_watch, fd, wd);
#else
return errno = ENOSYS, -1;
#endif
}
int uv__sendmmsg(int fd,
struct uv__mmsghdr* mmsg,
unsigned int vlen,

View File

@ -31,23 +31,6 @@
#include <sys/time.h>
#include <sys/socket.h>
#define UV__IN_CLOEXEC O_CLOEXEC
#define UV__IN_NONBLOCK O_NONBLOCK
/* inotify flags */
#define UV__IN_ACCESS 0x001
#define UV__IN_MODIFY 0x002
#define UV__IN_ATTRIB 0x004
#define UV__IN_CLOSE_WRITE 0x008
#define UV__IN_CLOSE_NOWRITE 0x010
#define UV__IN_OPEN 0x020
#define UV__IN_MOVED_FROM 0x040
#define UV__IN_MOVED_TO 0x080
#define UV__IN_CREATE 0x100
#define UV__IN_DELETE 0x200
#define UV__IN_DELETE_SELF 0x400
#define UV__IN_MOVE_SELF 0x800
struct uv__statx_timestamp {
int64_t tv_sec;
uint32_t tv_nsec;
@ -78,23 +61,11 @@ struct uv__statx {
uint64_t unused1[14];
};
struct uv__inotify_event {
int32_t wd;
uint32_t mask;
uint32_t cookie;
uint32_t len;
/* char name[0]; */
};
struct uv__mmsghdr {
struct msghdr msg_hdr;
unsigned int msg_len;
};
int uv__inotify_init(void);
int uv__inotify_init1(int flags);
int uv__inotify_add_watch(int fd, const char* path, uint32_t mask);
int uv__inotify_rm_watch(int fd, int32_t wd);
int uv__recvmmsg(int fd,
struct uv__mmsghdr* mmsg,
unsigned int vlen,