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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "internal.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/sysinfo.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#undef NANOSEC
#define NANOSEC 1000000000
#undef HAVE_INOTIFY_INIT
#undef HAVE_INOTIFY_INIT1
#undef HAVE_INOTIFY_ADD_WATCH
#undef HAVE_INOTIFY_RM_WATCH
#if __NR_inotify_init
# define HAVE_INOTIFY_INIT 1
#endif
#if __NR_inotify_init1
# define HAVE_INOTIFY_INIT1 1
#endif
#if __NR_inotify_add_watch
# define HAVE_INOTIFY_ADD_WATCH 1
#endif
#if __NR_inotify_rm_watch
# define HAVE_INOTIFY_RM_WATCH 1
#endif
#if HAVE_INOTIFY_INIT || HAVE_INOTIFY_INIT1
# undef IN_ACCESS
# undef IN_MODIFY
# undef IN_ATTRIB
# undef IN_CLOSE_WRITE
# undef IN_CLOSE_NOWRITE
# undef IN_OPEN
# undef IN_MOVED_FROM
# undef IN_MOVED_TO
# undef IN_CREATE
# undef IN_DELETE
# undef IN_DELETE_SELF
# undef IN_MOVE_SELF
# define IN_ACCESS 0x001
# define IN_MODIFY 0x002
# define IN_ATTRIB 0x004
# define IN_CLOSE_WRITE 0x008
# define IN_CLOSE_NOWRITE 0x010
# define IN_OPEN 0x020
# define IN_MOVED_FROM 0x040
# define IN_MOVED_TO 0x080
# define IN_CREATE 0x100
# define IN_DELETE 0x200
# define IN_DELETE_SELF 0x400
# define IN_MOVE_SELF 0x800
struct inotify_event {
int32_t wd;
uint32_t mask;
uint32_t cookie;
uint32_t len;
/* char name[0]; */
};
#endif /* HAVE_INOTIFY_INIT || HAVE_INOTIFY_INIT1 */
#undef IN_CLOEXEC
#undef IN_NONBLOCK
#if HAVE_INOTIFY_INIT1
# define IN_CLOEXEC O_CLOEXEC
# define IN_NONBLOCK O_NONBLOCK
#endif /* HAVE_INOTIFY_INIT1 */
#if HAVE_INOTIFY_INIT
inline static int inotify_init(void) {
return syscall(__NR_inotify_init);
}
#endif /* HAVE_INOTIFY_INIT */
#if HAVE_INOTIFY_INIT1
inline static int inotify_init1(int flags) {
return syscall(__NR_inotify_init1, flags);
}
#endif /* HAVE_INOTIFY_INIT1 */
#if HAVE_INOTIFY_ADD_WATCH
inline static int inotify_add_watch(int fd, const char* path, uint32_t mask) {
return syscall(__NR_inotify_add_watch, fd, path, mask);
}
#endif /* HAVE_INOTIFY_ADD_WATCH */
#if HAVE_INOTIFY_RM_WATCH
inline static int inotify_rm_watch(int fd, uint32_t wd) {
return syscall(__NR_inotify_rm_watch, fd, wd);
}
#endif /* HAVE_INOTIFY_RM_WATCH */
/* Don't look aghast, this is exactly how glibc's basename() works. */
static char* basename_r(const char* path) {
char* s = strrchr(path, '/');
return s ? (s + 1) : (char*)path;
}
/*
* There's probably some way to get time from Linux than gettimeofday(). What
* it is, I don't know.
*/
uint64_t uv_hrtime() {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (ts.tv_sec * NANOSEC + ts.tv_nsec);
}
void uv_loadavg(double avg[3]) {
struct sysinfo info;
if (sysinfo(&info) < 0) return;
avg[0] = (double) info.loads[0] / 65536.0;
avg[1] = (double) info.loads[1] / 65536.0;
avg[2] = (double) info.loads[2] / 65536.0;
}
int uv_exepath(char* buffer, size_t* size) {
if (!buffer || !size) {
return -1;
}
*size = readlink("/proc/self/exe", buffer, *size - 1);
if (*size <= 0) return -1;
buffer[*size] = '\0';
return 0;
}
uint64_t uv_get_free_memory(void) {
return (uint64_t) sysconf(_SC_PAGESIZE) * sysconf(_SC_AVPHYS_PAGES);
}
uint64_t uv_get_total_memory(void) {
return (uint64_t) sysconf(_SC_PAGESIZE) * sysconf(_SC_PHYS_PAGES);
}
#if HAVE_INOTIFY_INIT || HAVE_INOTIFY_INIT1
static int new_inotify_fd(void) {
int fd;
#if HAVE_INOTIFY_INIT1
fd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (fd != -1)
return fd;
if (errno != ENOSYS)
return -1;
#endif
if ((fd = inotify_init()) == -1)
return -1;
if (uv__cloexec(fd, 1) || uv__nonblock(fd, 1)) {
SAVE_ERRNO(uv__close(fd));
fd = -1;
}
return fd;
}
static void uv__inotify_read(EV_P_ ev_io* w, int revents) {
struct inotify_event* e;
uv_fs_event_t* handle;
const char* filename;
ssize_t size;
int events;
char *p;
/* needs to be large enough for sizeof(inotify_event) + strlen(filename) */
char buf[4096];
handle = container_of(w, uv_fs_event_t, read_watcher);
do {
do {
size = read(handle->fd, buf, sizeof buf);
}
while (size == -1 && errno == EINTR);
if (size == -1) {
assert(errno == EAGAIN || errno == EWOULDBLOCK);
break;
}
assert(size > 0); /* pre-2.6.21 thing, size=0 == read buffer too small */
/* Now we have one or more inotify_event structs. */
for (p = buf; p < buf + size; p += sizeof(*e) + e->len) {
e = (void*)p;
events = 0;
if (e->mask & (IN_ATTRIB|IN_MODIFY))
events |= UV_CHANGE;
if (e->mask & ~(IN_ATTRIB|IN_MODIFY))
events |= UV_RENAME;
/* inotify does not return the filename when monitoring a single file
* for modifications. Repurpose the filename for API compatibility.
* I'm not convinced this is a good thing, maybe it should go.
*/
filename = e->len ? (const char*) (e + 1) : basename_r(handle->filename);
handle->cb(handle, filename, events, 0);
if (handle->fd == -1)
break;
}
}
while (handle->fd != -1); /* handle might've been closed by callback */
}
int uv_fs_event_init(uv_loop_t* loop,
uv_fs_event_t* handle,
const char* filename,
uv_fs_event_cb cb,
int flags) {
int events;
int fd;
loop->counters.fs_event_init++;
/* We don't support any flags yet. */
assert(!flags);
/*
* TODO share a single inotify fd across the event loop?
* We'll run into fs.inotify.max_user_instances if we
* keep creating new inotify fds.
*/
if ((fd = new_inotify_fd()) == -1) {
uv__set_sys_error(loop, errno);
return -1;
}
events = IN_ATTRIB
| IN_CREATE
| IN_MODIFY
| IN_DELETE
| IN_DELETE_SELF
| IN_MOVE_SELF
| IN_MOVED_FROM
| IN_MOVED_TO;
if (inotify_add_watch(fd, filename, events) == -1) {
uv__set_sys_error(loop, errno);
uv__close(fd);
return -1;
}
uv__handle_init(loop, (uv_handle_t*)handle, UV_FS_EVENT);
handle->filename = strdup(filename); /* this should go! */
handle->cb = cb;
handle->fd = fd;
ev_io_init(&handle->read_watcher, uv__inotify_read, fd, EV_READ);
ev_io_start(loop->ev, &handle->read_watcher);
ev_unref(loop->ev);
return 0;
}
void uv__fs_event_destroy(uv_fs_event_t* handle) {
ev_ref(handle->loop->ev);
ev_io_stop(handle->loop->ev, &handle->read_watcher);
uv__close(handle->fd);
handle->fd = -1;
free(handle->filename);
handle->filename = NULL;
}
#else /* !HAVE_INOTIFY_INIT || HAVE_INOTIFY_INIT1 */
int uv_fs_event_init(uv_loop_t* loop,
uv_fs_event_t* handle,
const char* filename,
uv_fs_event_cb cb,
int flags) {
loop->counters.fs_event_init++;
uv__set_sys_error(loop, ENOSYS);
return -1;
}
void uv__fs_event_destroy(uv_fs_event_t* handle) {
assert(0 && "unreachable");
abort();
}
#endif /* HAVE_INOTIFY_INIT || HAVE_INOTIFY_INIT1 */
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