summaryrefslogtreecommitdiff
path: root/Utilities/cmlibuv/src/unix/linux-core.c
diff options
context:
space:
mode:
Diffstat (limited to 'Utilities/cmlibuv/src/unix/linux-core.c')
-rw-r--r--Utilities/cmlibuv/src/unix/linux-core.c834
1 files changed, 834 insertions, 0 deletions
diff --git a/Utilities/cmlibuv/src/unix/linux-core.c b/Utilities/cmlibuv/src/unix/linux-core.c
new file mode 100644
index 0000000000..23a7dafec8
--- /dev/null
+++ b/Utilities/cmlibuv/src/unix/linux-core.c
@@ -0,0 +1,834 @@
+/* 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
+
+# if defined(__ANDROID_API__) && __ANDROID_API__ < 24
+# undef HAVE_IFADDRS_H
+#endif
+
+#ifdef __UCLIBC__
+# if __UCLIBC_MAJOR__ < 0 && __UCLIBC_MINOR__ < 9 && __UCLIBC_SUBLEVEL__ < 32
+# undef HAVE_IFADDRS_H
+# endif
+#endif
+
+#ifdef HAVE_IFADDRS_H
+# include <ifaddrs.h>
+# 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) {
+
+ loop->inotify_fd = -1;
+ loop->inotify_watchers = NULL;
+
+ return uv__epoll_init(loop);
+}
+
+
+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;
+}
+
+
+
+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;
+ char buf[128];
+ struct timespec now;
+ int r;
+
+ /* Try /proc/uptime first, then fallback to clock_gettime(). */
+
+ if (0 == uv__slurp("/proc/uptime", buf, sizeof(buf)))
+ if (1 == sscanf(buf, "%lf", uptime))
+ return 0;
+
+ /* 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_clock_gettime: r = clock_gettime(CLOCK_MONOTONIC, &now);
+ }
+ else if ((r = clock_gettime(CLOCK_BOOTTIME, &now)) && errno == EINVAL) {
+ no_clock_boottime = 1;
+ goto retry_clock_gettime;
+ }
+
+ 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 ppc and 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) {
+#if defined(__PPC__)
+ static const char model_marker[] = "cpu\t\t: ";
+ static const char speed_marker[] = "clock\t\t: ";
+#else
+ static const char model_marker[] = "model name\t: ";
+ static const char speed_marker[] = "cpu MHz\t\t: ";
+#endif
+ const char* inferred_model;
+ unsigned int model_idx;
+ unsigned int speed_idx;
+ unsigned int part_idx;
+ char buf[1024];
+ char* model;
+ FILE* fp;
+ int model_id;
+
+ /* Most are unused on non-ARM, non-MIPS and non-x86 architectures. */
+ (void) &model_marker;
+ (void) &speed_marker;
+ (void) &speed_idx;
+ (void) &part_idx;
+ (void) &model;
+ (void) &buf;
+ (void) &fp;
+ (void) &model_id;
+
+ model_idx = 0;
+ speed_idx = 0;
+ part_idx = 0;
+
+#if defined(__arm__) || \
+ defined(__i386__) || \
+ defined(__mips__) || \
+ defined(__aarch64__) || \
+ defined(__PPC__) || \
+ 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__) || defined(__aarch64__)
+ if (model_idx < numcpus) {
+#if defined(__arm__)
+ /* Fallback for pre-3.8 kernels. */
+ static const char model_marker[] = "Processor\t: ";
+#elif defined(__aarch64__)
+ static const char part_marker[] = "CPU part\t: ";
+
+ /* Adapted from: https://github.com/karelzak/util-linux */
+ struct vendor_part {
+ const int id;
+ const char* name;
+ };
+
+ static const struct vendor_part arm_chips[] = {
+ { 0x811, "ARM810" },
+ { 0x920, "ARM920" },
+ { 0x922, "ARM922" },
+ { 0x926, "ARM926" },
+ { 0x940, "ARM940" },
+ { 0x946, "ARM946" },
+ { 0x966, "ARM966" },
+ { 0xa20, "ARM1020" },
+ { 0xa22, "ARM1022" },
+ { 0xa26, "ARM1026" },
+ { 0xb02, "ARM11 MPCore" },
+ { 0xb36, "ARM1136" },
+ { 0xb56, "ARM1156" },
+ { 0xb76, "ARM1176" },
+ { 0xc05, "Cortex-A5" },
+ { 0xc07, "Cortex-A7" },
+ { 0xc08, "Cortex-A8" },
+ { 0xc09, "Cortex-A9" },
+ { 0xc0d, "Cortex-A17" }, /* Originally A12 */
+ { 0xc0f, "Cortex-A15" },
+ { 0xc0e, "Cortex-A17" },
+ { 0xc14, "Cortex-R4" },
+ { 0xc15, "Cortex-R5" },
+ { 0xc17, "Cortex-R7" },
+ { 0xc18, "Cortex-R8" },
+ { 0xc20, "Cortex-M0" },
+ { 0xc21, "Cortex-M1" },
+ { 0xc23, "Cortex-M3" },
+ { 0xc24, "Cortex-M4" },
+ { 0xc27, "Cortex-M7" },
+ { 0xc60, "Cortex-M0+" },
+ { 0xd01, "Cortex-A32" },
+ { 0xd03, "Cortex-A53" },
+ { 0xd04, "Cortex-A35" },
+ { 0xd05, "Cortex-A55" },
+ { 0xd06, "Cortex-A65" },
+ { 0xd07, "Cortex-A57" },
+ { 0xd08, "Cortex-A72" },
+ { 0xd09, "Cortex-A73" },
+ { 0xd0a, "Cortex-A75" },
+ { 0xd0b, "Cortex-A76" },
+ { 0xd0c, "Neoverse-N1" },
+ { 0xd0d, "Cortex-A77" },
+ { 0xd0e, "Cortex-A76AE" },
+ { 0xd13, "Cortex-R52" },
+ { 0xd20, "Cortex-M23" },
+ { 0xd21, "Cortex-M33" },
+ { 0xd41, "Cortex-A78" },
+ { 0xd42, "Cortex-A78AE" },
+ { 0xd4a, "Neoverse-E1" },
+ { 0xd4b, "Cortex-A78C" },
+ };
+
+ if (strncmp(buf, part_marker, sizeof(part_marker) - 1) == 0) {
+ model = buf + sizeof(part_marker) - 1;
+
+ errno = 0;
+ model_id = strtol(model, NULL, 16);
+ if ((errno != 0) || model_id < 0) {
+ fclose(fp);
+ return UV_EINVAL;
+ }
+
+ for (part_idx = 0; part_idx < ARRAY_SIZE(arm_chips); part_idx++) {
+ if (model_id == arm_chips[part_idx].id) {
+ model = uv__strdup(arm_chips[part_idx].name);
+ if (model == NULL) {
+ fclose(fp);
+ return UV_ENOMEM;
+ }
+ ci[model_idx++].model = model;
+ break;
+ }
+ }
+ }
+#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__ && !__aarch64__ */
+ 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__ || __aarch64__ */
+ }
+
+ fclose(fp);
+#endif /* __arm__ || __i386__ || __mips__ || __PPC__ || __x86_64__ || __aarch__ */
+
+ /* 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);
+ assert(ticks != (unsigned int) -1);
+ assert(ticks != 0);
+ multiplier = ((uint64_t)1000L / ticks);
+
+ 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;
+}
+
+
+#ifdef HAVE_IFADDRS_H
+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;
+}
+#endif
+
+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 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("MemAvailable:");
+
+ 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;
+}
View Lorry Controller Status