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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 <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>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <limits.h> /* INT_MAX, PATH_MAX */
#include <sys/uio.h> /* writev */
#include <sys/resource.h> /* getrusage */
#ifdef __linux__
# include <sys/ioctl.h>
#endif
#ifdef __sun
# include <sys/types.h>
# include <sys/wait.h>
#endif
#ifdef __APPLE__
# include <mach-o/dyld.h> /* _NSGetExecutablePath */
# include <sys/filio.h>
# include <sys/ioctl.h>
#endif
#ifdef __FreeBSD__
# include <sys/sysctl.h>
# include <sys/filio.h>
# include <sys/ioctl.h>
# include <sys/wait.h>
# define UV__O_CLOEXEC O_CLOEXEC
# if __FreeBSD__ >= 10
# define uv__accept4 accept4
# define UV__SOCK_NONBLOCK SOCK_NONBLOCK
# define UV__SOCK_CLOEXEC SOCK_CLOEXEC
# endif
# if !defined(F_DUP2FD_CLOEXEC) && defined(_F_DUP2FD_CLOEXEC)
# define F_DUP2FD_CLOEXEC _F_DUP2FD_CLOEXEC
# endif
#endif
#ifdef _AIX
#include <sys/ioctl.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));
uint64_t uv_hrtime(void) {
return uv__hrtime(UV_CLOCK_PRECISE);
}
void uv_close(uv_handle_t* handle, uv_close_cb close_cb) {
assert(!(handle->flags & (UV_CLOSING | UV_CLOSED)));
handle->flags |= UV_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);
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);
break;
case UV_SIGNAL:
uv__signal_close((uv_signal_t*) handle);
/* Signal handles may not be closed immediately. The signal code will */
/* itself close uv__make_close_pending whenever appropriate. */
return;
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 -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 -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 -errno;
return 0;
}
void uv__make_close_pending(uv_handle_t* handle) {
assert(handle->flags & UV_CLOSING);
assert(!(handle->flags & UV_CLOSED));
handle->next_closing = handle->loop->closing_handles;
handle->loop->closing_handles = handle;
}
static void uv__finish_close(uv_handle_t* handle) {
/* Note: while the handle is in the UV_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_CLOSING);
assert(!(handle->flags & UV_CLOSED));
handle->flags |= UV_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:
case UV_SIGNAL:
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);
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;
}
int uv_backend_timeout(const uv_loop_t* loop) {
if (loop->stop_flag != 0)
return 0;
if (!uv__has_active_handles(loop) && !uv__has_active_reqs(loop))
return 0;
if (!QUEUE_EMPTY(&loop->idle_handles))
return 0;
if (loop->closing_handles)
return 0;
return uv__next_timeout(loop);
}
static int uv__loop_alive(const uv_loop_t* loop) {
return uv__has_active_handles(loop) ||
uv__has_active_reqs(loop) ||
loop->closing_handles != NULL;
}
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;
r = uv__loop_alive(loop);
if (!r)
uv__update_time(loop);
while (r != 0 && loop->stop_flag == 0) {
uv__update_time(loop);
uv__run_timers(loop);
uv__run_pending(loop);
uv__run_idle(loop);
uv__run_prepare(loop);
timeout = 0;
if ((mode & UV_RUN_NOWAIT) == 0)
timeout = uv_backend_timeout(loop);
uv__io_poll(loop, timeout);
uv__run_check(loop);
uv__run_closing_handles(loop);
if (mode == UV_RUN_ONCE) {
/* UV_RUN_ONCE implies forward progess: at least one callback must have
* been invoked when it returns. uv__io_poll() can return without doing
* I/O (meaning: no callbacks) when its timeout expires - which means we
* have pending timers that satisfy the forward progress constraint.
*
* UV_RUN_NOWAIT makes no guarantees about progress so it's omitted from
* the check.
*/
uv__update_time(loop);
uv__run_timers(loop);
}
r = uv__loop_alive(loop);
if (mode & (UV_RUN_ONCE | 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 -errno;
#endif
sockfd = socket(domain, type, protocol);
if (sockfd == -1)
return -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;
}
int uv__accept(int sockfd) {
int peerfd;
int err;
assert(sockfd >= 0);
while (1) {
#if defined(__linux__) || __FreeBSD__ >= 10
static int no_accept4;
if (no_accept4)
goto skip;
peerfd = uv__accept4(sockfd,
NULL,
NULL,
UV__SOCK_NONBLOCK|UV__SOCK_CLOEXEC);
if (peerfd != -1)
return peerfd;
if (errno == EINTR)
continue;
if (errno != ENOSYS)
return -errno;
no_accept4 = 1;
skip:
#endif
peerfd = accept(sockfd, NULL, NULL);
if (peerfd == -1) {
if (errno == EINTR)
continue;
return -errno;
}
err = uv__cloexec(peerfd, 1);
if (err == 0)
err = uv__nonblock(peerfd, 1);
if (err) {
uv__close(peerfd);
return err;
}
return peerfd;
}
}
int uv__close(int fd) {
int saved_errno;
int rc;
assert(fd > -1); /* Catch uninitialized io_watcher.fd bugs. */
assert(fd > STDERR_FILENO); /* Catch stdio close bugs. */
saved_errno = errno;
rc = close(fd);
if (rc == -1) {
rc = -errno;
if (rc == -EINTR)
rc = -EINPROGRESS; /* For platform/libc consistency. */
errno = saved_errno;
}
return rc;
}
#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) || \
defined(_AIX)
int uv__nonblock(int fd, int set) {
int r;
do
r = ioctl(fd, FIONBIO, &set);
while (r == -1 && errno == EINTR);
if (r)
return -errno;
return 0;
}
int uv__cloexec(int fd, int set) {
int r;
do
r = ioctl(fd, set ? FIOCLEX : FIONCLEX);
while (r == -1 && errno == EINTR);
if (r)
return -errno;
return 0;
}
#else /* !(defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)) */
int uv__nonblock(int fd, int set) {
int flags;
int r;
do
r = fcntl(fd, F_GETFL);
while (r == -1 && errno == EINTR);
if (r == -1)
return -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 -errno;
return 0;
}
int uv__cloexec(int fd, int set) {
int flags;
int r;
do
r = fcntl(fd, F_GETFD);
while (r == -1 && errno == EINTR);
if (r == -1)
return -errno;
/* Bail out now if already set/clear. */
if (!!(r & FD_CLOEXEC) == !!set)
return 0;
if (set)
flags = r | FD_CLOEXEC;
else
flags = r & ~FD_CLOEXEC;
do
r = fcntl(fd, F_SETFD, flags);
while (r == -1 && errno == EINTR);
if (r)
return -errno;
return 0;
}
#endif /* defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) */
/* This function is not execve-safe, there is a race window
* between the call to dup() and fcntl(FD_CLOEXEC).
*/
int uv__dup(int fd) {
int err;
fd = dup(fd);
if (fd == -1)
return -errno;
err = uv__cloexec(fd, 1);
if (err) {
uv__close(fd);
return err;
}
return fd;
}
ssize_t uv__recvmsg(int fd, struct msghdr* msg, int flags) {
struct cmsghdr* cmsg;
ssize_t rc;
int* pfd;
int* end;
#if defined(__linux__)
static int no_msg_cmsg_cloexec;
if (no_msg_cmsg_cloexec == 0) {
rc = recvmsg(fd, msg, flags | 0x40000000); /* MSG_CMSG_CLOEXEC */
if (rc != -1)
return rc;
if (errno != EINVAL)
return -errno;
rc = recvmsg(fd, msg, flags);
if (rc == -1)
return -errno;
no_msg_cmsg_cloexec = 1;
} else {
rc = recvmsg(fd, msg, flags);
}
#else
rc = recvmsg(fd, msg, flags);
#endif
if (rc == -1)
return -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;
}
int uv_cwd(char* buffer, size_t* size) {
if (buffer == NULL || size == NULL)
return -EINVAL;
if (getcwd(buffer, *size) == NULL)
return -errno;
*size = strlen(buffer);
return 0;
}
int uv_chdir(const char* dir) {
if (chdir(dir))
return -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 -EINVAL;
}
if (uv__is_closing(handle) || fd_out == -1)
return -EBADF;
*fd = fd_out;
return 0;
}
static void uv__run_pending(uv_loop_t* loop) {
QUEUE* q;
uv__io_t* w;
while (!QUEUE_EMPTY(&loop->pending_queue)) {
q = QUEUE_HEAD(&loop->pending_queue);
QUEUE_REMOVE(q);
QUEUE_INIT(q);
w = QUEUE_DATA(q, uv__io_t, pending_queue);
w->cb(loop, w, UV__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 = realloc(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);
QUEUE_INIT(&w->pending_queue);
QUEUE_INIT(&w->watcher_queue);
w->cb = cb;
w->fd = fd;
w->events = 0;
w->pevents = 0;
#if defined(UV_HAVE_KQUEUE)
w->rcount = 0;
w->wcount = 0;
#endif /* defined(UV_HAVE_KQUEUE) */
}
void uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
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) {
if (w->events == 0 && !QUEUE_EMPTY(&w->watcher_queue)) {
QUEUE_REMOVE(&w->watcher_queue);
QUEUE_INIT(&w->watcher_queue);
}
return;
}
#endif
if (QUEUE_EMPTY(&w->watcher_queue))
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 & ~(UV__POLLIN | UV__POLLOUT)));
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) {
QUEUE_REMOVE(&w->watcher_queue);
QUEUE_INIT(&w->watcher_queue);
if (loop->watchers[w->fd] != NULL) {
assert(loop->watchers[w->fd] == w);
assert(loop->nfds > 0);
loop->watchers[w->fd] = NULL;
loop->nfds--;
w->events = 0;
}
}
else if (QUEUE_EMPTY(&w->watcher_queue))
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, UV__POLLIN | UV__POLLOUT);
QUEUE_REMOVE(&w->pending_queue);
/* Remove stale events for this file descriptor */
uv__platform_invalidate_fd(loop, w->fd);
}
void uv__io_feed(uv_loop_t* loop, uv__io_t* w) {
if (QUEUE_EMPTY(&w->pending_queue))
QUEUE_INSERT_TAIL(&loop->pending_queue, &w->pending_queue);
}
int uv__io_active(const uv__io_t* w, unsigned int events) {
assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
assert(0 != events);
return 0 != (w->pevents & events);
}
int uv_getrusage(uv_rusage_t* rusage) {
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage))
return -errno;
rusage->ru_utime.tv_sec = usage.ru_utime.tv_sec;
rusage->ru_utime.tv_usec = usage.ru_utime.tv_usec;
rusage->ru_stime.tv_sec = usage.ru_stime.tv_sec;
rusage->ru_stime.tv_usec = usage.ru_stime.tv_usec;
rusage->ru_maxrss = usage.ru_maxrss;
rusage->ru_ixrss = usage.ru_ixrss;
rusage->ru_idrss = usage.ru_idrss;
rusage->ru_isrss = usage.ru_isrss;
rusage->ru_minflt = usage.ru_minflt;
rusage->ru_majflt = usage.ru_majflt;
rusage->ru_nswap = usage.ru_nswap;
rusage->ru_inblock = usage.ru_inblock;
rusage->ru_oublock = usage.ru_oublock;
rusage->ru_msgsnd = usage.ru_msgsnd;
rusage->ru_msgrcv = usage.ru_msgrcv;
rusage->ru_nsignals = usage.ru_nsignals;
rusage->ru_nvcsw = usage.ru_nvcsw;
rusage->ru_nivcsw = usage.ru_nivcsw;
return 0;
}
int uv__open_cloexec(const char* path, int flags) {
int err;
int fd;
#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD__ >= 9)
static int no_cloexec;
if (!no_cloexec) {
fd = open(path, flags | UV__O_CLOEXEC);
if (fd != -1)
return fd;
if (errno != EINVAL)
return -errno;
/* O_CLOEXEC not supported. */
no_cloexec = 1;
}
#endif
fd = open(path, flags);
if (fd == -1)
return -errno;
err = uv__cloexec(fd, 1);
if (err) {
uv__close(fd);
return err;
}
return fd;
}
int uv__dup2_cloexec(int oldfd, int newfd) {
int r;
#if defined(__FreeBSD__) && __FreeBSD__ >= 10
do
r = dup3(oldfd, newfd, O_CLOEXEC);
while (r == -1 && errno == EINTR);
if (r == -1)
return -errno;
return r;
#elif defined(__FreeBSD__) && defined(F_DUP2FD_CLOEXEC)
do
r = fcntl(oldfd, F_DUP2FD_CLOEXEC, newfd);
while (r == -1 && errno == EINTR);
if (r != -1)
return r;
if (errno != EINVAL)
return -errno;
/* Fall through. */
#elif defined(__linux__)
static int no_dup3;
if (!no_dup3) {
do
r = uv__dup3(oldfd, newfd, UV__O_CLOEXEC);
while (r == -1 && (errno == EINTR || errno == EBUSY));
if (r != -1)
return r;
if (errno != ENOSYS)
return -errno;
/* Fall through. */
no_dup3 = 1;
}
#endif
{
int err;
do
r = dup2(oldfd, newfd);
#if defined(__linux__)
while (r == -1 && (errno == EINTR || errno == EBUSY));
#else
while (r == -1 && errno == EINTR);
#endif
if (r == -1)
return -errno;
err = uv__cloexec(newfd, 1);
if (err) {
uv__close(newfd);
return err;
}
return r;
}
}