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core.c
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core.c
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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 "strtok.h"
#include <stddef.h> /* NULL */
#include <stdio.h> /* printf */
#include <stdlib.h>
#include <string.h> /* strerror */
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h> /* O_CLOEXEC */
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <limits.h> /* INT_MAX, PATH_MAX, IOV_MAX */
#include <sys/uio.h> /* writev */
#include <sys/resource.h> /* getrusage */
#include <pwd.h>
#include <grp.h>
#include <sys/utsname.h>
#include <sys/time.h>
#include <time.h> /* clock_gettime */
#ifdef __sun
# include <sys/filio.h>
# include <sys/wait.h>
#endif
#if defined(__APPLE__)
# include <sys/filio.h>
# endif /* defined(__APPLE__) */
#if defined(__APPLE__) && !TARGET_OS_IPHONE
# include <crt_externs.h>
# include <mach-o/dyld.h> /* _NSGetExecutablePath */
# define environ (*_NSGetEnviron())
#else /* defined(__APPLE__) && !TARGET_OS_IPHONE */
extern char** environ;
#endif /* !(defined(__APPLE__) && !TARGET_OS_IPHONE) */
#if defined(__DragonFly__) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__OpenBSD__)
# include <sys/sysctl.h>
# include <sys/filio.h>
# include <sys/wait.h>
# include <sys/param.h>
# if defined(__FreeBSD__)
# include <sys/cpuset.h>
# define uv__accept4 accept4
# endif
# if defined(__NetBSD__)
# define uv__accept4(a, b, c, d) paccept((a), (b), (c), NULL, (d))
# endif
#endif
#if defined(__MVS__)
# include <sys/ioctl.h>
# include "zos-sys-info.h"
#endif
#if defined(__linux__)
# include <sched.h>
# include <sys/syscall.h>
# define gettid() syscall(SYS_gettid)
# define uv__accept4 accept4
#endif
#if defined(__linux__) && defined(__SANITIZE_THREAD__) && defined(__clang__)
# include <sanitizer/linux_syscall_hooks.h>
#endif
static void uv__run_pending(uv_loop_t* loop);
/* Verify that uv_buf_t is ABI-compatible with struct iovec. */
STATIC_ASSERT(sizeof(uv_buf_t) == sizeof(struct iovec));
STATIC_ASSERT(sizeof(((uv_buf_t*) 0)->base) ==
sizeof(((struct iovec*) 0)->iov_base));
STATIC_ASSERT(sizeof(((uv_buf_t*) 0)->len) ==
sizeof(((struct iovec*) 0)->iov_len));
STATIC_ASSERT(offsetof(uv_buf_t, base) == offsetof(struct iovec, iov_base));
STATIC_ASSERT(offsetof(uv_buf_t, len) == offsetof(struct iovec, iov_len));
/* https://github.com/libuv/libuv/issues/1674 */
int uv_clock_gettime(uv_clock_id clock_id, uv_timespec64_t* ts) {
struct timespec t;
int r;
if (ts == NULL)
return UV_EFAULT;
switch (clock_id) {
default:
return UV_EINVAL;
case UV_CLOCK_MONOTONIC:
r = clock_gettime(CLOCK_MONOTONIC, &t);
break;
case UV_CLOCK_REALTIME:
r = clock_gettime(CLOCK_REALTIME, &t);
break;
}
if (r)
return UV__ERR(errno);
ts->tv_sec = t.tv_sec;
ts->tv_nsec = t.tv_nsec;
return 0;
}
uint64_t uv_hrtime(void) {
return uv__hrtime(UV_CLOCK_PRECISE);
}
void uv_close(uv_handle_t* handle, uv_close_cb close_cb) {
assert(!uv__is_closing(handle));
handle->flags |= UV_HANDLE_CLOSING;
handle->close_cb = close_cb;
switch (handle->type) {
case UV_NAMED_PIPE:
uv__pipe_close((uv_pipe_t*)handle);
break;
case UV_TTY:
uv__stream_close((uv_stream_t*)handle);
break;
case UV_TCP:
uv__tcp_close((uv_tcp_t*)handle);
break;
case UV_UDP:
uv__udp_close((uv_udp_t*)handle);
break;
case UV_PREPARE:
uv__prepare_close((uv_prepare_t*)handle);
break;
case UV_CHECK:
uv__check_close((uv_check_t*)handle);
break;
case UV_IDLE:
uv__idle_close((uv_idle_t*)handle);
break;
case UV_ASYNC:
uv__async_close((uv_async_t*)handle);
break;
case UV_TIMER:
uv__timer_close((uv_timer_t*)handle);
break;
case UV_PROCESS:
uv__process_close((uv_process_t*)handle);
break;
case UV_FS_EVENT:
uv__fs_event_close((uv_fs_event_t*)handle);
#if defined(__sun) || defined(__MVS__)
/*
* On Solaris, illumos, and z/OS we will not be able to dissociate the
* watcher for an event which is pending delivery, so we cannot always call
* uv__make_close_pending() straight away. The backend will call the
* function once the event has cleared.
*/
return;
#endif
break;
case UV_POLL:
uv__poll_close((uv_poll_t*)handle);
break;
case UV_FS_POLL:
uv__fs_poll_close((uv_fs_poll_t*)handle);
/* Poll handles use file system requests, and one of them may still be
* running. The poll code will call uv__make_close_pending() for us. */
return;
case UV_SIGNAL:
uv__signal_close((uv_signal_t*) handle);
break;
default:
assert(0);
}
uv__make_close_pending(handle);
}
int uv__socket_sockopt(uv_handle_t* handle, int optname, int* value) {
int r;
int fd;
socklen_t len;
if (handle == NULL || value == NULL)
return UV_EINVAL;
if (handle->type == UV_TCP || handle->type == UV_NAMED_PIPE)
fd = uv__stream_fd((uv_stream_t*) handle);
else if (handle->type == UV_UDP)
fd = ((uv_udp_t *) handle)->io_watcher.fd;
else
return UV_ENOTSUP;
len = sizeof(*value);
if (*value == 0)
r = getsockopt(fd, SOL_SOCKET, optname, value, &len);
else
r = setsockopt(fd, SOL_SOCKET, optname, (const void*) value, len);
if (r < 0)
return UV__ERR(errno);
return 0;
}
void uv__make_close_pending(uv_handle_t* handle) {
assert(handle->flags & UV_HANDLE_CLOSING);
assert(!(handle->flags & UV_HANDLE_CLOSED));
handle->next_closing = handle->loop->closing_handles;
handle->loop->closing_handles = handle;
}
int uv__getiovmax(void) {
#if defined(IOV_MAX)
return IOV_MAX;
#elif defined(_SC_IOV_MAX)
static _Atomic int iovmax_cached = -1;
int iovmax;
iovmax = atomic_load_explicit(&iovmax_cached, memory_order_relaxed);
if (iovmax != -1)
return iovmax;
/* On some embedded devices (arm-linux-uclibc based ip camera),
* sysconf(_SC_IOV_MAX) can not get the correct value. The return
* value is -1 and the errno is EINPROGRESS. Degrade the value to 1.
*/
iovmax = sysconf(_SC_IOV_MAX);
if (iovmax == -1)
iovmax = 1;
atomic_store_explicit(&iovmax_cached, iovmax, memory_order_relaxed);
return iovmax;
#else
return 1024;
#endif
}
static void uv__finish_close(uv_handle_t* handle) {
uv_signal_t* sh;
/* Note: while the handle is in the UV_HANDLE_CLOSING state now, it's still
* possible for it to be active in the sense that uv__is_active() returns
* true.
*
* A good example is when the user calls uv_shutdown(), immediately followed
* by uv_close(). The handle is considered active at this point because the
* completion of the shutdown req is still pending.
*/
assert(handle->flags & UV_HANDLE_CLOSING);
assert(!(handle->flags & UV_HANDLE_CLOSED));
handle->flags |= UV_HANDLE_CLOSED;
switch (handle->type) {
case UV_PREPARE:
case UV_CHECK:
case UV_IDLE:
case UV_ASYNC:
case UV_TIMER:
case UV_PROCESS:
case UV_FS_EVENT:
case UV_FS_POLL:
case UV_POLL:
break;
case UV_SIGNAL:
/* If there are any caught signals "trapped" in the signal pipe,
* we can't call the close callback yet. Reinserting the handle
* into the closing queue makes the event loop spin but that's
* okay because we only need to deliver the pending events.
*/
sh = (uv_signal_t*) handle;
if (sh->caught_signals > sh->dispatched_signals) {
handle->flags ^= UV_HANDLE_CLOSED;
uv__make_close_pending(handle); /* Back into the queue. */
return;
}
break;
case UV_NAMED_PIPE:
case UV_TCP:
case UV_TTY:
uv__stream_destroy((uv_stream_t*)handle);
break;
case UV_UDP:
uv__udp_finish_close((uv_udp_t*)handle);
break;
default:
assert(0);
break;
}
uv__handle_unref(handle);
uv__queue_remove(&handle->handle_queue);
if (handle->close_cb) {
handle->close_cb(handle);
}
}
static void uv__run_closing_handles(uv_loop_t* loop) {
uv_handle_t* p;
uv_handle_t* q;
p = loop->closing_handles;
loop->closing_handles = NULL;
while (p) {
q = p->next_closing;
uv__finish_close(p);
p = q;
}
}
int uv_is_closing(const uv_handle_t* handle) {
return uv__is_closing(handle);
}
int uv_backend_fd(const uv_loop_t* loop) {
return loop->backend_fd;
}
static int uv__loop_alive(const uv_loop_t* loop) {
return uv__has_active_handles(loop) ||
uv__has_active_reqs(loop) ||
!uv__queue_empty(&loop->pending_queue) ||
loop->closing_handles != NULL;
}
static int uv__backend_timeout(const uv_loop_t* loop) {
if (loop->stop_flag == 0 &&
/* uv__loop_alive(loop) && */
(uv__has_active_handles(loop) || uv__has_active_reqs(loop)) &&
uv__queue_empty(&loop->pending_queue) &&
uv__queue_empty(&loop->idle_handles) &&
(loop->flags & UV_LOOP_REAP_CHILDREN) == 0 &&
loop->closing_handles == NULL)
return uv__next_timeout(loop);
return 0;
}
int uv_backend_timeout(const uv_loop_t* loop) {
if (uv__queue_empty(&loop->watcher_queue))
return uv__backend_timeout(loop);
/* Need to call uv_run to update the backend fd state. */
return 0;
}
int uv_loop_alive(const uv_loop_t* loop) {
return uv__loop_alive(loop);
}
int uv_run(uv_loop_t* loop, uv_run_mode mode) {
int timeout;
int r;
int can_sleep;
r = uv__loop_alive(loop);
if (!r)
uv__update_time(loop);
/* Maintain backwards compatibility by processing timers before entering the
* while loop for UV_RUN_DEFAULT. Otherwise timers only need to be executed
* once, which should be done after polling in order to maintain proper
* execution order of the conceptual event loop. */
if (mode == UV_RUN_DEFAULT && r != 0 && loop->stop_flag == 0) {
uv__update_time(loop);
uv__run_timers(loop);
}
while (r != 0 && loop->stop_flag == 0) {
can_sleep =
uv__queue_empty(&loop->pending_queue) &&
uv__queue_empty(&loop->idle_handles);
uv__run_pending(loop);
uv__run_idle(loop);
uv__run_prepare(loop);
timeout = 0;
if ((mode == UV_RUN_ONCE && can_sleep) || mode == UV_RUN_DEFAULT)
timeout = uv__backend_timeout(loop);
uv__metrics_inc_loop_count(loop);
uv__io_poll(loop, timeout);
/* Process immediate callbacks (e.g. write_cb) a small fixed number of
* times to avoid loop starvation.*/
for (r = 0; r < 8 && !uv__queue_empty(&loop->pending_queue); r++)
uv__run_pending(loop);
/* Run one final update on the provider_idle_time in case uv__io_poll
* returned because the timeout expired, but no events were received. This
* call will be ignored if the provider_entry_time was either never set (if
* the timeout == 0) or was already updated b/c an event was received.
*/
uv__metrics_update_idle_time(loop);
uv__run_check(loop);
uv__run_closing_handles(loop);
uv__update_time(loop);
uv__run_timers(loop);
r = uv__loop_alive(loop);
if (mode == UV_RUN_ONCE || mode == UV_RUN_NOWAIT)
break;
}
/* The if statement lets gcc compile it to a conditional store. Avoids
* dirtying a cache line.
*/
if (loop->stop_flag != 0)
loop->stop_flag = 0;
return r;
}
void uv_update_time(uv_loop_t* loop) {
uv__update_time(loop);
}
int uv_is_active(const uv_handle_t* handle) {
return uv__is_active(handle);
}
/* Open a socket in non-blocking close-on-exec mode, atomically if possible. */
int uv__socket(int domain, int type, int protocol) {
int sockfd;
int err;
#if defined(SOCK_NONBLOCK) && defined(SOCK_CLOEXEC)
sockfd = socket(domain, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
if (sockfd != -1)
return sockfd;
if (errno != EINVAL)
return UV__ERR(errno);
#endif
sockfd = socket(domain, type, protocol);
if (sockfd == -1)
return UV__ERR(errno);
err = uv__nonblock(sockfd, 1);
if (err == 0)
err = uv__cloexec(sockfd, 1);
if (err) {
uv__close(sockfd);
return err;
}
#if defined(SO_NOSIGPIPE)
{
int on = 1;
setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, &on, sizeof(on));
}
#endif
return sockfd;
}
/* get a file pointer to a file in read-only and close-on-exec mode */
FILE* uv__open_file(const char* path) {
int fd;
FILE* fp;
fd = uv__open_cloexec(path, O_RDONLY);
if (fd < 0)
return NULL;
fp = fdopen(fd, "r");
if (fp == NULL)
uv__close(fd);
return fp;
}
int uv__accept(int sockfd) {
int peerfd;
int err;
(void) &err;
assert(sockfd >= 0);
do
#ifdef uv__accept4
peerfd = uv__accept4(sockfd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
#else
peerfd = accept(sockfd, NULL, NULL);
#endif
while (peerfd == -1 && errno == EINTR);
if (peerfd == -1)
return UV__ERR(errno);
#ifndef uv__accept4
err = uv__cloexec(peerfd, 1);
if (err == 0)
err = uv__nonblock(peerfd, 1);
if (err != 0) {
uv__close(peerfd);
return err;
}
#endif
return peerfd;
}
/* close() on macos has the "interesting" quirk that it fails with EINTR
* without closing the file descriptor when a thread is in the cancel state.
* That's why libuv calls close$NOCANCEL() instead.
*
* glibc on linux has a similar issue: close() is a cancellation point and
* will unwind the thread when it's in the cancel state. Work around that
* by making the system call directly. Musl libc is unaffected.
*/
int uv__close_nocancel(int fd) {
#if defined(__APPLE__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdollar-in-identifier-extension"
#if defined(__LP64__) || TARGET_OS_IPHONE
extern int close$NOCANCEL(int);
return close$NOCANCEL(fd);
#else
extern int close$NOCANCEL$UNIX2003(int);
return close$NOCANCEL$UNIX2003(fd);
#endif
#pragma GCC diagnostic pop
#elif defined(__linux__) && defined(__SANITIZE_THREAD__) && defined(__clang__)
long rc;
__sanitizer_syscall_pre_close(fd);
rc = syscall(SYS_close, fd);
__sanitizer_syscall_post_close(rc, fd);
return rc;
#elif defined(__linux__) && !defined(__SANITIZE_THREAD__)
return syscall(SYS_close, fd);
#else
return close(fd);
#endif
}
int uv__close_nocheckstdio(int fd) {
int saved_errno;
int rc;
assert(fd > -1); /* Catch uninitialized io_watcher.fd bugs. */
saved_errno = errno;
rc = uv__close_nocancel(fd);
if (rc == -1) {
rc = UV__ERR(errno);
if (rc == UV_EINTR || rc == UV__ERR(EINPROGRESS))
rc = 0; /* The close is in progress, not an error. */
errno = saved_errno;
}
return rc;
}
int uv__close(int fd) {
assert(fd > STDERR_FILENO); /* Catch stdio close bugs. */
#if defined(__MVS__)
SAVE_ERRNO(epoll_file_close(fd));
#endif
return uv__close_nocheckstdio(fd);
}
#if UV__NONBLOCK_IS_IOCTL
int uv__nonblock_ioctl(int fd, int set) {
int r;
do
r = ioctl(fd, FIONBIO, &set);
while (r == -1 && errno == EINTR);
if (r)
return UV__ERR(errno);
return 0;
}
#endif
int uv__nonblock_fcntl(int fd, int set) {
int flags;
int r;
do
r = fcntl(fd, F_GETFL);
while (r == -1 && errno == EINTR);
if (r == -1)
return UV__ERR(errno);
/* Bail out now if already set/clear. */
if (!!(r & O_NONBLOCK) == !!set)
return 0;
if (set)
flags = r | O_NONBLOCK;
else
flags = r & ~O_NONBLOCK;
do
r = fcntl(fd, F_SETFL, flags);
while (r == -1 && errno == EINTR);
if (r)
return UV__ERR(errno);
return 0;
}
int uv__cloexec(int fd, int set) {
int flags;
int r;
flags = 0;
if (set)
flags = FD_CLOEXEC;
do
r = fcntl(fd, F_SETFD, flags);
while (r == -1 && errno == EINTR);
if (r)
return UV__ERR(errno);
return 0;
}
ssize_t uv__recvmsg(int fd, struct msghdr* msg, int flags) {
#if defined(__ANDROID__) || \
defined(__DragonFly__) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__OpenBSD__) || \
defined(__linux__)
ssize_t rc;
rc = recvmsg(fd, msg, flags | MSG_CMSG_CLOEXEC);
if (rc == -1)
return UV__ERR(errno);
return rc;
#else
struct cmsghdr* cmsg;
int* pfd;
int* end;
ssize_t rc;
rc = recvmsg(fd, msg, flags);
if (rc == -1)
return UV__ERR(errno);
if (msg->msg_controllen == 0)
return rc;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
if (cmsg->cmsg_type == SCM_RIGHTS)
for (pfd = (int*) CMSG_DATA(cmsg),
end = (int*) ((char*) cmsg + cmsg->cmsg_len);
pfd < end;
pfd += 1)
uv__cloexec(*pfd, 1);
return rc;
#endif
}
int uv_cwd(char* buffer, size_t* size) {
char scratch[1 + UV__PATH_MAX];
if (buffer == NULL || size == NULL)
return UV_EINVAL;
/* Try to read directly into the user's buffer first... */
if (getcwd(buffer, *size) != NULL)
goto fixup;
if (errno != ERANGE)
return UV__ERR(errno);
/* ...or into scratch space if the user's buffer is too small
* so we can report how much space to provide on the next try.
*/
if (getcwd(scratch, sizeof(scratch)) == NULL)
return UV__ERR(errno);
buffer = scratch;
fixup:
*size = strlen(buffer);
if (*size > 1 && buffer[*size - 1] == '/') {
*size -= 1;
buffer[*size] = '\0';
}
if (buffer == scratch) {
*size += 1;
return UV_ENOBUFS;
}
return 0;
}
int uv_chdir(const char* dir) {
if (chdir(dir))
return UV__ERR(errno);
return 0;
}
void uv_disable_stdio_inheritance(void) {
int fd;
/* Set the CLOEXEC flag on all open descriptors. Unconditionally try the
* first 16 file descriptors. After that, bail out after the first error.
*/
for (fd = 0; ; fd++)
if (uv__cloexec(fd, 1) && fd > 15)
break;
}
int uv_fileno(const uv_handle_t* handle, uv_os_fd_t* fd) {
int fd_out;
switch (handle->type) {
case UV_TCP:
case UV_NAMED_PIPE:
case UV_TTY:
fd_out = uv__stream_fd((uv_stream_t*) handle);
break;
case UV_UDP:
fd_out = ((uv_udp_t *) handle)->io_watcher.fd;
break;
case UV_POLL:
fd_out = ((uv_poll_t *) handle)->io_watcher.fd;
break;
default:
return UV_EINVAL;
}
if (uv__is_closing(handle) || fd_out == -1)
return UV_EBADF;
*fd = fd_out;
return 0;
}
static void uv__run_pending(uv_loop_t* loop) {
struct uv__queue* q;
struct uv__queue pq;
uv__io_t* w;
uv__queue_move(&loop->pending_queue, &pq);
while (!uv__queue_empty(&pq)) {
q = uv__queue_head(&pq);
uv__queue_remove(q);
uv__queue_init(q);
w = uv__queue_data(q, uv__io_t, pending_queue);
w->cb(loop, w, POLLOUT);
}
}
static unsigned int next_power_of_two(unsigned int val) {
val -= 1;
val |= val >> 1;
val |= val >> 2;
val |= val >> 4;
val |= val >> 8;
val |= val >> 16;
val += 1;
return val;
}
static void maybe_resize(uv_loop_t* loop, unsigned int len) {
uv__io_t** watchers;
void* fake_watcher_list;
void* fake_watcher_count;
unsigned int nwatchers;
unsigned int i;
if (len <= loop->nwatchers)
return;
/* Preserve fake watcher list and count at the end of the watchers */
if (loop->watchers != NULL) {
fake_watcher_list = loop->watchers[loop->nwatchers];
fake_watcher_count = loop->watchers[loop->nwatchers + 1];
} else {
fake_watcher_list = NULL;
fake_watcher_count = NULL;
}
nwatchers = next_power_of_two(len + 2) - 2;
watchers = uv__reallocf(loop->watchers,
(nwatchers + 2) * sizeof(loop->watchers[0]));
if (watchers == NULL)
abort();
for (i = loop->nwatchers; i < nwatchers; i++)
watchers[i] = NULL;
watchers[nwatchers] = fake_watcher_list;
watchers[nwatchers + 1] = fake_watcher_count;
loop->watchers = watchers;
loop->nwatchers = nwatchers;
}
void uv__io_init(uv__io_t* w, uv__io_cb cb, int fd) {
assert(cb != NULL);
assert(fd >= -1);
uv__queue_init(&w->pending_queue);
uv__queue_init(&w->watcher_queue);
w->cb = cb;
w->fd = fd;
w->events = 0;
w->pevents = 0;
}
void uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
assert(0 == (events & ~(POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI)));
assert(0 != events);
assert(w->fd >= 0);
assert(w->fd < INT_MAX);
w->pevents |= events;
maybe_resize(loop, w->fd + 1);
#if !defined(__sun)
/* The event ports backend needs to rearm all file descriptors on each and
* every tick of the event loop but the other backends allow us to
* short-circuit here if the event mask is unchanged.
*/
if (w->events == w->pevents)
return;
#endif
if (uv__queue_empty(&w->watcher_queue))
uv__queue_insert_tail(&loop->watcher_queue, &w->watcher_queue);
if (loop->watchers[w->fd] == NULL) {
loop->watchers[w->fd] = w;
loop->nfds++;
}
}
void uv__io_stop(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
assert(0 == (events & ~(POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI)));
assert(0 != events);
if (w->fd == -1)
return;
assert(w->fd >= 0);
/* Happens when uv__io_stop() is called on a handle that was never started. */
if ((unsigned) w->fd >= loop->nwatchers)
return;
w->pevents &= ~events;
if (w->pevents == 0) {
uv__queue_remove(&w->watcher_queue);
uv__queue_init(&w->watcher_queue);
w->events = 0;
if (w == loop->watchers[w->fd]) {
assert(loop->nfds > 0);
loop->watchers[w->fd] = NULL;
loop->nfds--;
}
}
else if (uv__queue_empty(&w->watcher_queue))
uv__queue_insert_tail(&loop->watcher_queue, &w->watcher_queue);
}
void uv__io_close(uv_loop_t* loop, uv__io_t* w) {
uv__io_stop(loop, w, POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI);
uv__queue_remove(&w->pending_queue);
/* Remove stale events for this file descriptor */
if (w->fd != -1)
uv__platform_invalidate_fd(loop, w->fd);
}
void uv__io_feed(uv_loop_t* loop, uv__io_t* w) {
if (uv__queue_empty(&w->pending_queue))
uv__queue_insert_tail(&loop->pending_queue, &w->pending_queue);
}
int uv__io_active(const uv__io_t* w, unsigned int events) {
assert(0 == (events & ~(POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI)));
assert(0 != events);
return 0 != (w->pevents & events);
}
int uv__fd_exists(uv_loop_t* loop, int fd) {
return (unsigned) fd < loop->nwatchers && loop->watchers[fd] != NULL;
}
int uv_getrusage(uv_rusage_t* rusage) {
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage))
return UV__ERR(errno);
rusage->ru_utime.tv_sec = usage.ru_utime.tv_sec;
rusage->ru_utime.tv_usec = usage.ru_utime.tv_usec;