/* 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.
*/
/* We lean on the fact that POLL{IN,OUT,ERR,HUP} correspond with their
* EPOLL* counterparts. We use the POLL* variants in this file because that
* is what libuv uses elsewhere.
*/
#include "uv.h"
#include "internal.h"
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <net/if.h>
#include <sys/epoll.h>
#include <sys/param.h>
#include <sys/prctl.h>
#include <sys/sysinfo.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#define HAVE_IFADDRS_H 1
#ifdef __UCLIBC__
# if __UCLIBC_MAJOR__ < 0 && __UCLIBC_MINOR__ < 9 && __UCLIBC_SUBLEVEL__ < 32
# undef HAVE_IFADDRS_H
# endif
#endif
#ifdef HAVE_IFADDRS_H
# if defined(__ANDROID__)
# include "uv/android-ifaddrs.h"
# else
# include <ifaddrs.h>
# endif
# include <sys/socket.h>
# include <net/ethernet.h>
# include <netpacket/packet.h>
#endif /* HAVE_IFADDRS_H */
/* Available from 2.6.32 onwards. */
#ifndef CLOCK_MONOTONIC_COARSE
# define CLOCK_MONOTONIC_COARSE 6
#endif
/* This is rather annoying: CLOCK_BOOTTIME lives in <linux/time.h> but we can't
* include that file because it conflicts with <time.h>. We'll just have to
* define it ourselves.
*/
#ifndef CLOCK_BOOTTIME
# define CLOCK_BOOTTIME 7
#endif
static int read_models(unsigned int numcpus, uv_cpu_info_t* ci);
static int read_times(FILE* statfile_fp,
unsigned int numcpus,
uv_cpu_info_t* ci);
static void read_speeds(unsigned int numcpus, uv_cpu_info_t* ci);
static uint64_t read_cpufreq(unsigned int cpunum);
int uv__platform_loop_init(uv_loop_t* loop) {
int fd;
fd = epoll_create1(O_CLOEXEC);
/* epoll_create1() can fail either because it's not implemented (old kernel)
* or because it doesn't understand the O_CLOEXEC flag.
*/
if (fd == -1 && (errno == ENOSYS || errno == EINVAL)) {
fd = epoll_create(256);
if (fd != -1)
uv__cloexec(fd, 1);
}
loop->backend_fd = fd;
loop->inotify_fd = -1;
loop->inotify_watchers = NULL;
if (fd == -1)
return UV__ERR(errno);
return 0;
}
int uv__io_fork(uv_loop_t* loop) {
int err;
void* old_watchers;
old_watchers = loop->inotify_watchers;
uv__close(loop->backend_fd);
loop->backend_fd = -1;
uv__platform_loop_delete(loop);
err = uv__platform_loop_init(loop);
if (err)
return err;
return uv__inotify_fork(loop, old_watchers);
}
void uv__platform_loop_delete(uv_loop_t* loop) {
if (loop->inotify_fd == -1) return;
uv__io_stop(loop, &loop->inotify_read_watcher, POLLIN);
uv__close(loop->inotify_fd);
loop->inotify_fd = -1;
}
void uv__platform_invalidate_fd(uv_loop_t* loop, int fd) {
struct epoll_event* events;
struct epoll_event dummy;
uintptr_t i;
uintptr_t nfds;
assert(loop->watchers != NULL);
assert(fd >= 0);
events = (struct epoll_event*) loop->watchers[loop->nwatchers];
nfds = (uintptr_t) loop->watchers[loop->nwatchers + 1];
if (events != NULL)
/* Invalidate events with same file descriptor */
for (i = 0; i < nfds; i++)
if (events[i].data.fd == fd)
events[i].data.fd = -1;
/* Remove the file descriptor from the epoll.
* This avoids a problem where the same file description remains open
* in another process, causing repeated junk epoll events.
*
* We pass in a dummy epoll_event, to work around a bug in old kernels.
*/
if (loop->backend_fd >= 0) {
/* Work around a bug in kernels 3.10 to 3.19 where passing a struct that
* has the EPOLLWAKEUP flag set generates spurious audit syslog warnings.
*/
memset(&dummy, 0, sizeof(dummy));
epoll_ctl(loop->backend_fd, EPOLL_CTL_DEL, fd, &dummy);
}
}
int uv__io_check_fd(uv_loop_t* loop, int fd) {
struct epoll_event e;
int rc;
memset(&e, 0, sizeof(e));
e.events = POLLIN;
e.data.fd = -1;
rc = 0;
if (epoll_ctl(loop->backend_fd, EPOLL_CTL_ADD, fd, &e))
if (errno != EEXIST)
rc = UV__ERR(errno);
if (rc == 0)
if (epoll_ctl(loop->backend_fd, EPOLL_CTL_DEL, fd, &e))
abort();
return rc;
}
void uv__io_poll(uv_loop_t* loop, int timeout) {
/* A bug in kernels < 2.6.37 makes timeouts larger than ~30 minutes
* effectively infinite on 32 bits architectures. To avoid blocking
* indefinitely, we cap the timeout and poll again if necessary.
*
* Note that "30 minutes" is a simplification because it depends on
* the value of CONFIG_HZ. The magic constant assumes CONFIG_HZ=1200,
* that being the largest value I have seen in the wild (and only once.)
*/
static const int max_safe_timeout = 1789569;
static int no_epoll_pwait_cached;
static int no_epoll_wait_cached;
int no_epoll_pwait;
int no_epoll_wait;
struct epoll_event events[1024];
struct epoll_event* pe;
struct epoll_event e;
int real_timeout;
QUEUE* q;
uv__io_t* w;
sigset_t sigset;
uint64_t sigmask;
uint64_t base;
int have_signals;
int nevents;
int count;
int nfds;
int fd;
int op;
int i;
int user_timeout;
int reset_timeout;
if (loop->nfds == 0) {
assert(QUEUE_EMPTY(&loop->watcher_queue));
return;
}
memset(&e, 0, sizeof(e));
while (!QUEUE_EMPTY(&loop->watcher_queue)) {
q = QUEUE_HEAD(&loop->watcher_queue);
QUEUE_REMOVE(q);
QUEUE_INIT(q);
w = QUEUE_DATA(q, uv__io_t, watcher_queue);
assert(w->pevents != 0);
assert(w->fd >= 0);
assert(w->fd < (int) loop->nwatchers);
e.events = w->pevents;
e.data.fd = w->fd;
if (w->events == 0)
op = EPOLL_CTL_ADD;
else
op = EPOLL_CTL_MOD;
/* XXX Future optimization: do EPOLL_CTL_MOD lazily if we stop watching
* events, skip the syscall and squelch the events after epoll_wait().
*/
if (epoll_ctl(loop->backend_fd, op, w->fd, &e)) {
if (errno != EEXIST)
abort();
assert(op == EPOLL_CTL_ADD);
/* We've reactivated a file descriptor that's been watched before. */
if (epoll_ctl(loop->backend_fd, EPOLL_CTL_MOD, w->fd, &e))
abort();
}
w->events = w->pevents;
}
sigmask = 0;
if (loop->flags & UV_LOOP_BLOCK_SIGPROF) {
sigemptyset(&sigset);
sigaddset(&sigset, SIGPROF);
sigmask |= 1 << (SIGPROF - 1);
}
assert(timeout >= -1);
base = loop->time;
count = 48; /* Benchmarks suggest this gives the best throughput. */
real_timeout = timeout;
if (uv__get_internal_fields(loop)->flags & UV_METRICS_IDLE_TIME) {
reset_timeout = 1;
user_timeout = timeout;
timeout = 0;
} else {
reset_timeout = 0;
user_timeout = 0;
}
/* You could argue there is a dependency between these two but
* ultimately we don't care about their ordering with respect
* to one another. Worst case, we make a few system calls that
* could have been avoided because another thread already knows
* they fail with ENOSYS. Hardly the end of the world.
*/
no_epoll_pwait = uv__load_relaxed(&no_epoll_pwait_cached);
no_epoll_wait = uv__load_relaxed(&no_epoll_wait_cached);
for (;;) {
/* Only need to set the provider_entry_time if timeout != 0. The function
* will return early if the loop isn't configured with UV_METRICS_IDLE_TIME.
*/
if (timeout != 0)
uv__metrics_set_provider_entry_time(loop);
/* See the comment for max_safe_timeout for an explanation of why
* this is necessary. Executive summary: kernel bug workaround.
*/
if (sizeof(int32_t) == sizeof(long) && timeout >= max_safe_timeout)
timeout = max_safe_timeout;
if (sigmask != 0 && no_epoll_pwait != 0)
if (pthread_sigmask(SIG_BLOCK, &sigset, NULL))
abort();
if (no_epoll_wait != 0 || (sigmask != 0 && no_epoll_pwait == 0)) {
nfds = epoll_pwait(loop->backend_fd,
events,
ARRAY_SIZE(events),
timeout,
&sigset);
if (nfds == -1 && errno == ENOSYS) {
uv__store_relaxed(&no_epoll_pwait_cached, 1);
no_epoll_pwait = 1;
}
} else {
nfds = epoll_wait(loop->backend_fd,
events,
ARRAY_SIZE(events),
timeout);
if (nfds == -1 && errno == ENOSYS) {
uv__store_relaxed(&no_epoll_wait_cached, 1);
no_epoll_wait = 1;
}
}
if (sigmask != 0 && no_epoll_pwait != 0)
if (pthread_sigmask(SIG_UNBLOCK, &sigset, NULL))
abort();
/* Update loop->time unconditionally. It's tempting to skip the update when
* timeout == 0 (i.e. non-blocking poll) but there is no guarantee that the
* operating system didn't reschedule our process while in the syscall.
*/
SAVE_ERRNO(uv__update_time(loop));
if (nfds == 0) {
assert(timeout != -1);
if (reset_timeout != 0) {
timeout = user_timeout;
reset_timeout = 0;
}
if (timeout == -1)
continue;
if (timeout == 0)
return;
/* We may have been inside the system call for longer than |timeout|
* milliseconds so we need to update the timestamp to avoid drift.
*/
goto update_timeout;
}
if (nfds == -1) {
if (errno == ENOSYS) {
/* epoll_wait() or epoll_pwait() failed, try the other system call. */
assert(no_epoll_wait == 0 || no_epoll_pwait == 0);
continue;
}
if (errno != EINTR)
abort();
if (reset_timeout != 0) {
timeout = user_timeout;
reset_timeout = 0;
}
if (timeout == -1)
continue;
if (timeout == 0)
return;
/* Interrupted by a signal. Update timeout and poll again. */
goto update_timeout;
}
have_signals = 0;
nevents = 0;
{
/* Squelch a -Waddress-of-packed-member warning with gcc >= 9. */
union {
struct epoll_event* events;
uv__io_t* watchers;
} x;
x.events = events;
assert(loop->watchers != NULL);
loop->watchers[loop->nwatchers] = x.watchers;
loop->watchers[loop->nwatchers + 1] = (void*) (uintptr_t) nfds;
}
for (i = 0; i < nfds; i++) {
pe = events + i;
fd = pe->data.fd;
/* Skip invalidated events, see uv__platform_invalidate_fd */
if (fd == -1)
continue;
assert(fd >= 0);
assert((unsigned) fd < loop->nwatchers);
w = loop->watchers[fd];
if (w == NULL) {
/* File descriptor that we've stopped watching, disarm it.
*
* Ignore all errors because we may be racing with another thread
* when the file descriptor is closed.
*/
epoll_ctl(loop->backend_fd, EPOLL_CTL_DEL, fd, pe);
continue;
}
/* Give users only events they're interested in. Prevents spurious
* callbacks when previous callback invocation in this loop has stopped
* the current watcher. Also, filters out events that users has not
* requested us to watch.
*/
pe->events &= w->pevents | POLLERR | POLLHUP;
/* Work around an epoll quirk where it sometimes reports just the
* EPOLLERR or EPOLLHUP event. In order to force the event loop to
* move forward, we merge in the read/write events that the watcher
* is interested in; uv__read() and uv__write() will then deal with
* the error or hangup in the usual fashion.
*
* Note to self: happens when epoll reports EPOLLIN|EPOLLHUP, the user
* reads the available data, calls uv_read_stop(), then sometime later
* calls uv_read_start() again. By then, libuv has forgotten about the
* hangup and the kernel won't report EPOLLIN again because there's
* nothing left to read. If anything, libuv is to blame here. The
* current hack is just a quick bandaid; to properly fix it, libuv
* needs to remember the error/hangup event. We should get that for
* free when we switch over to edge-triggered I/O.
*/
if (pe->events == POLLERR || pe->events == POLLHUP)
pe->events |=
w->pevents & (POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI);
if (pe->events != 0) {
/* Run signal watchers last. This also affects child process watchers
* because those are implemented in terms of signal watchers.
*/
if (w == &loop->signal_io_watcher) {
have_signals = 1;
} else {
uv__metrics_update_idle_time(loop);
w->cb(loop, w, pe->events);
}
nevents++;
}
}
if (reset_timeout != 0) {
timeout = user_timeout;
reset_timeout = 0;
}
if (have_signals != 0) {
uv__metrics_update_idle_time(loop);
loop->signal_io_watcher.cb(loop, &loop->signal_io_watcher, POLLIN);
}
loop->watchers[loop->nwatchers] = NULL;
loop->watchers[loop->nwatchers + 1] = NULL;
if (have_signals != 0)
return; /* Event loop should cycle now so don't poll again. */
if (nevents != 0) {
if (nfds == ARRAY_SIZE(events) && --count != 0) {
/* Poll for more events but don't block this time. */
timeout = 0;
continue;
}
return;
}
if (timeout == 0)
return;
if (timeout == -1)
continue;
update_timeout:
assert(timeout > 0);
real_timeout -= (loop->time - base);
if (real_timeout <= 0)
return;
timeout = real_timeout;
}
}
uint64_t uv__hrtime(uv_clocktype_t type) {
static clock_t fast_clock_id = -1;
struct timespec t;
clock_t clock_id;
/* Prefer CLOCK_MONOTONIC_COARSE if available but only when it has
* millisecond granularity or better. CLOCK_MONOTONIC_COARSE is
* serviced entirely from the vDSO, whereas CLOCK_MONOTONIC may
* decide to make a costly system call.
*/
/* TODO(bnoordhuis) Use CLOCK_MONOTONIC_COARSE for UV_CLOCK_PRECISE
* when it has microsecond granularity or better (unlikely).
*/
clock_id = CLOCK_MONOTONIC;
if (type != UV_CLOCK_FAST)
goto done;
clock_id = uv__load_relaxed(&fast_clock_id);
if (clock_id != -1)
goto done;
clock_id = CLOCK_MONOTONIC;
if (0 == clock_getres(CLOCK_MONOTONIC_COARSE, &t))
if (t.tv_nsec <= 1 * 1000 * 1000)
clock_id = CLOCK_MONOTONIC_COARSE;
uv__store_relaxed(&fast_clock_id, clock_id);
done:
if (clock_gettime(clock_id, &t))
return 0; /* Not really possible. */
return t.tv_sec * (uint64_t) 1e9 + t.tv_nsec;
}
int uv_resident_set_memory(size_t* rss) {
char buf[1024];
const char* s;
ssize_t n;
long val;
int fd;
int i;
do
fd = open("/proc/self/stat", O_RDONLY);
while (fd == -1 && errno == EINTR);
if (fd == -1)
return UV__ERR(errno);
do
n = read(fd, buf, sizeof(buf) - 1);
while (n == -1 && errno == EINTR);
uv__close(fd);
if (n == -1)
return UV__ERR(errno);
buf[n] = '\0';
s = strchr(buf, ' ');
if (s == NULL)
goto err;
s += 1;
if (*s != '(')
goto err;
s = strchr(s, ')');
if (s == NULL)
goto err;
for (i = 1; i <= 22; i++) {
s = strchr(s + 1, ' ');
if (s == NULL)
goto err;
}
errno = 0;
val = strtol(s, NULL, 10);
if (errno != 0)
goto err;
if (val < 0)
goto err;
*rss = val * getpagesize();
return 0;
err:
return UV_EINVAL;
}
int uv_uptime(double* uptime) {
static volatile int no_clock_boottime;
struct timespec now;
int r;
/* Try CLOCK_BOOTTIME first, fall back to CLOCK_MONOTONIC if not available
* (pre-2.6.39 kernels). CLOCK_MONOTONIC doesn't increase when the system
* is suspended.
*/
if (no_clock_boottime) {
retry: r = clock_gettime(CLOCK_MONOTONIC, &now);
}
else if ((r = clock_gettime(CLOCK_BOOTTIME, &now)) && errno == EINVAL) {
no_clock_boottime = 1;
goto retry;
}
if (r)
return UV__ERR(errno);
*uptime = now.tv_sec;
return 0;
}
static int uv__cpu_num(FILE* statfile_fp, unsigned int* numcpus) {
unsigned int num;
char buf[1024];
if (!fgets(buf, sizeof(buf), statfile_fp))
return UV_EIO;
num = 0;
while (fgets(buf, sizeof(buf), statfile_fp)) {
if (strncmp(buf, "cpu", 3))
break;
num++;
}
if (num == 0)
return UV_EIO;
*numcpus = num;
return 0;
}
int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {
unsigned int numcpus;
uv_cpu_info_t* ci;
int err;
FILE* statfile_fp;
*cpu_infos = NULL;
*count = 0;
statfile_fp = uv__open_file("/proc/stat");
if (statfile_fp == NULL)
return UV__ERR(errno);
err = uv__cpu_num(statfile_fp, &numcpus);
if (err < 0)
goto out;
err = UV_ENOMEM;
ci = uv__calloc(numcpus, sizeof(*ci));
if (ci == NULL)
goto out;
err = read_models(numcpus, ci);
if (err == 0)
err = read_times(statfile_fp, numcpus, ci);
if (err) {
uv_free_cpu_info(ci, numcpus);
goto out;
}
/* read_models() on x86 also reads the CPU speed from /proc/cpuinfo.
* We don't check for errors here. Worst case, the field is left zero.
*/
if (ci[0].speed == 0)
read_speeds(numcpus, ci);
*cpu_infos = ci;
*count = numcpus;
err = 0;
out:
if (fclose(statfile_fp))
if (errno != EINTR && errno != EINPROGRESS)
abort();
return err;
}
static void read_speeds(unsigned int numcpus, uv_cpu_info_t* ci) {
unsigned int num;
for (num = 0; num < numcpus; num++)
ci[num].speed = read_cpufreq(num) / 1000;
}
/* Also reads the CPU frequency on x86. The other architectures only have
* a BogoMIPS field, which may not be very accurate.
*
* Note: Simply returns on error, uv_cpu_info() takes care of the cleanup.
*/
static int read_models(unsigned int numcpus, uv_cpu_info_t* ci) {
static const char model_marker[] = "model name\t: ";
static const char speed_marker[] = "cpu MHz\t\t: ";
const char* inferred_model;
unsigned int model_idx;
unsigned int speed_idx;
char buf[1024];
char* model;
FILE* fp;
/* Most are unused on non-ARM, non-MIPS and non-x86 architectures. */
(void) &model_marker;
(void) &speed_marker;
(void) &speed_idx;
(void) &model;
(void) &buf;
(void) &fp;
model_idx = 0;
speed_idx = 0;
#if defined(__arm__) || \
defined(__i386__) || \
defined(__mips__) || \
defined(__x86_64__)
fp = uv__open_file("/proc/cpuinfo");
if (fp == NULL)
return UV__ERR(errno);
while (fgets(buf, sizeof(buf), fp)) {
if (model_idx < numcpus) {
if (strncmp(buf, model_marker, sizeof(model_marker) - 1) == 0) {
model = buf + sizeof(model_marker) - 1;
model = uv__strndup(model, strlen(model) - 1); /* Strip newline. */
if (model == NULL) {
fclose(fp);
return UV_ENOMEM;
}
ci[model_idx++].model = model;
continue;
}
}
#if defined(__arm__) || defined(__mips__)
if (model_idx < numcpus) {
#if defined(__arm__)
/* Fallback for pre-3.8 kernels. */
static const char model_marker[] = "Processor\t: ";
#else /* defined(__mips__) */
static const char model_marker[] = "cpu model\t\t: ";
#endif
if (strncmp(buf, model_marker, sizeof(model_marker) - 1) == 0) {
model = buf + sizeof(model_marker) - 1;
model = uv__strndup(model, strlen(model) - 1); /* Strip newline. */
if (model == NULL) {
fclose(fp);
return UV_ENOMEM;
}
ci[model_idx++].model = model;
continue;
}
}
#else /* !__arm__ && !__mips__ */
if (speed_idx < numcpus) {
if (strncmp(buf, speed_marker, sizeof(speed_marker) - 1) == 0) {
ci[speed_idx++].speed = atoi(buf + sizeof(speed_marker) - 1);
continue;
}
}
#endif /* __arm__ || __mips__ */
}
fclose(fp);
#endif /* __arm__ || __i386__ || __mips__ || __x86_64__ */
/* Now we want to make sure that all the models contain *something* because
* it's not safe to leave them as null. Copy the last entry unless there
* isn't one, in that case we simply put "unknown" into everything.
*/
inferred_model = "unknown";
if (model_idx > 0)
inferred_model = ci[model_idx - 1].model;
while (model_idx < numcpus) {
model = uv__strndup(inferred_model, strlen(inferred_model));
if (model == NULL)
return UV_ENOMEM;
ci[model_idx++].model = model;
}
return 0;
}
static int read_times(FILE* statfile_fp,
unsigned int numcpus,
uv_cpu_info_t* ci) {
struct uv_cpu_times_s ts;
unsigned int ticks;
unsigned int multiplier;
uint64_t user;
uint64_t nice;
uint64_t sys;
uint64_t idle;
uint64_t dummy;
uint64_t irq;
uint64_t num;
uint64_t len;
char buf[1024];
ticks = (unsigned int)sysconf(_SC_CLK_TCK);
multiplier = ((uint64_t)1000L / ticks);
assert(ticks != (unsigned int) -1);
assert(ticks != 0);
rewind(statfile_fp);
if (!fgets(buf, sizeof(buf), statfile_fp))
abort();
num = 0;
while (fgets(buf, sizeof(buf), statfile_fp)) {
if (num >= numcpus)
break;
if (strncmp(buf, "cpu", 3))
break;
/* skip "cpu<num> " marker */
{
unsigned int n;
int r = sscanf(buf, "cpu%u ", &n);
assert(r == 1);
(void) r; /* silence build warning */
for (len = sizeof("cpu0"); n /= 10; len++);
}
/* Line contains user, nice, system, idle, iowait, irq, softirq, steal,
* guest, guest_nice but we're only interested in the first four + irq.
*
* Don't use %*s to skip fields or %ll to read straight into the uint64_t
* fields, they're not allowed in C89 mode.
*/
if (6 != sscanf(buf + len,
"%" PRIu64 " %" PRIu64 " %" PRIu64
"%" PRIu64 " %" PRIu64 " %" PRIu64,
&user,
&nice,
&sys,
&idle,
&dummy,
&irq))
abort();
ts.user = user * multiplier;
ts.nice = nice * multiplier;
ts.sys = sys * multiplier;
ts.idle = idle * multiplier;
ts.irq = irq * multiplier;
ci[num++].cpu_times = ts;
}
assert(num == numcpus);
return 0;
}
static uint64_t read_cpufreq(unsigned int cpunum) {
uint64_t val;
char buf[1024];
FILE* fp;
snprintf(buf,
sizeof(buf),
"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_cur_freq",
cpunum);
fp = uv__open_file(buf);
if (fp == NULL)
return 0;
if (fscanf(fp, "%" PRIu64, &val) != 1)
val = 0;
fclose(fp);
return val;
}
static int uv__ifaddr_exclude(struct ifaddrs *ent, int exclude_type) {
if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
return 1;
if (ent->ifa_addr == NULL)
return 1;
/*
* On Linux getifaddrs returns information related to the raw underlying
* devices. We're not interested in this information yet.
*/
if (ent->ifa_addr->sa_family == PF_PACKET)
return exclude_type;
return !exclude_type;
}
int uv_interface_addresses(uv_interface_address_t** addresses, int* count) {
#ifndef HAVE_IFADDRS_H
*count = 0;
*addresses = NULL;
return UV_ENOSYS;
#else
struct ifaddrs *addrs, *ent;
uv_interface_address_t* address;
int i;
struct sockaddr_ll *sll;
*count = 0;
*addresses = NULL;
if (getifaddrs(&addrs))
return UV__ERR(errno);
/* Count the number of interfaces */
for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
if (uv__ifaddr_exclude(ent, UV__EXCLUDE_IFADDR))
continue;
(*count)++;
}
if (*count == 0) {
freeifaddrs(addrs);
return 0;
}
/* Make sure the memory is initiallized to zero using calloc() */
*addresses = uv__calloc(*count, sizeof(**addresses));
if (!(*addresses)) {
freeifaddrs(addrs);
return UV_ENOMEM;
}
address = *addresses;
for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
if (uv__ifaddr_exclude(ent, UV__EXCLUDE_IFADDR))
continue;
address->name = uv__strdup(ent->ifa_name);
if (ent->ifa_addr->sa_family == AF_INET6) {
address->address.address6 = *((struct sockaddr_in6*) ent->ifa_addr);
} else {
address->address.address4 = *((struct sockaddr_in*) ent->ifa_addr);
}
if (ent->ifa_netmask->sa_family == AF_INET6) {
address->netmask.netmask6 = *((struct sockaddr_in6*) ent->ifa_netmask);
} else {
address->netmask.netmask4 = *((struct sockaddr_in*) ent->ifa_netmask);
}
address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);
address++;
}
/* Fill in physical addresses for each interface */
for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
if (uv__ifaddr_exclude(ent, UV__EXCLUDE_IFPHYS))
continue;
address = *addresses;
for (i = 0; i < (*count); i++) {
size_t namelen = strlen(ent->ifa_name);
/* Alias interface share the same physical address */
if (strncmp(address->name, ent->ifa_name, namelen) == 0 &&
(address->name[namelen] == 0 || address->name[namelen] == ':')) {
sll = (struct sockaddr_ll*)ent->ifa_addr;
memcpy(address->phys_addr, sll->sll_addr, sizeof(address->phys_addr));
}
address++;
}
}
freeifaddrs(addrs);
return 0;
#endif
}
void uv_free_interface_addresses(uv_interface_address_t* addresses,
int count) {
int i;
for (i = 0; i < count; i++) {
uv__free(addresses[i].name);
}
uv__free(addresses);
}
void uv__set_process_title(const char* title) {
#if defined(PR_SET_NAME)
prctl(PR_SET_NAME, title); /* Only copies first 16 characters. */
#endif
}
static int uv__slurp(const char* filename, char* buf, size_t len) {
ssize_t n;
int fd;
assert(len > 0);
fd = uv__open_cloexec(filename, O_RDONLY);
if (fd < 0)
return fd;
do
n = read(fd, buf, len - 1);
while (n == -1 && errno == EINTR);
if (uv__close_nocheckstdio(fd))
abort();
if (n < 0)
return UV__ERR(errno);
buf[n] = '\0';
return 0;
}
static uint64_t uv__read_proc_meminfo(const char* what) {
uint64_t rc;
char* p;
char buf[4096]; /* Large enough to hold all of /proc/meminfo. */
if (uv__slurp("/proc/meminfo", buf, sizeof(buf)))
return 0;
p = strstr(buf, what);
if (p == NULL)
return 0;
p += strlen(what);
rc = 0;
sscanf(p, "%" PRIu64 " kB", &rc);
return rc * 1024;
}
uint64_t uv_get_free_memory(void) {
struct sysinfo info;
uint64_t rc;
rc = uv__read_proc_meminfo("MemFree:");
if (rc != 0)
return rc;
if (0 == sysinfo(&info))
return (uint64_t) info.freeram * info.mem_unit;
return 0;
}
uint64_t uv_get_total_memory(void) {
struct sysinfo info;
uint64_t rc;
rc = uv__read_proc_meminfo("MemTotal:");
if (rc != 0)
return rc;
if (0 == sysinfo(&info))
return (uint64_t) info.totalram * info.mem_unit;
return 0;
}
static uint64_t uv__read_cgroups_uint64(const char* cgroup, const char* param) {
char filename[256];
char buf[32]; /* Large enough to hold an encoded uint64_t. */
uint64_t rc;
rc = 0;
snprintf(filename, sizeof(filename), "/sys/fs/cgroup/%s/%s", cgroup, param);
if (0 == uv__slurp(filename, buf, sizeof(buf)))
sscanf(buf, "%" PRIu64, &rc);
return rc;
}
uint64_t uv_get_constrained_memory(void) {
/*
* This might return 0 if there was a problem getting the memory limit from
* cgroups. This is OK because a return value of 0 signifies that the memory
* limit is unknown.
*/
return uv__read_cgroups_uint64("memory", "memory.limit_in_bytes");
}
void uv_loadavg(double avg[3]) {
struct sysinfo info;
char buf[128]; /* Large enough to hold all of /proc/loadavg. */
if (0 == uv__slurp("/proc/loadavg", buf, sizeof(buf)))
if (3 == sscanf(buf, "%lf %lf %lf", &avg[0], &avg[1], &avg[2]))
return;
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;
}