mirror of
https://github.com/netdata/netdata.git
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300 lines
8.1 KiB
C
300 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#include "os.h"
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// ----------------------------------------------------------------------------
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// system functions
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// to retrieve settings of the system
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#define CPUS_FOR_COLLECTORS 0
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#define CPUS_FOR_NETDATA 1
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long get_system_cpus_with_cache(bool cache, bool for_netdata) {
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static long processors[2] = { 0, 0 };
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int index = for_netdata ? CPUS_FOR_NETDATA : CPUS_FOR_COLLECTORS;
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if(likely(cache && processors[index] > 0))
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return processors[index];
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#if defined(__APPLE__) || defined(__FreeBSD__)
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#if defined(__APPLE__)
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#define HW_CPU_NAME "hw.logicalcpu"
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#else
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#define HW_CPU_NAME "hw.ncpu"
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#endif
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int32_t tmp_processors;
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bool error = false;
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if (unlikely(GETSYSCTL_BY_NAME(HW_CPU_NAME, tmp_processors)))
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error = true;
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else
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processors[index] = tmp_processors;
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if(processors[index] < 1) {
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processors[index] = 1;
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if(error)
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netdata_log_error("Assuming system has %d processors.", processors[index]);
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}
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return processors[index];
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#else
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char filename[FILENAME_MAX + 1];
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snprintfz(filename, FILENAME_MAX, "%s/proc/stat",
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(!for_netdata && netdata_configured_host_prefix) ? netdata_configured_host_prefix : "");
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procfile *ff = procfile_open(filename, NULL, PROCFILE_FLAG_DEFAULT);
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if(!ff) {
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processors[index] = 1;
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netdata_log_error("Cannot open file '%s'. Assuming system has %ld processors.", filename, processors[index]);
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return processors[index];
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}
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ff = procfile_readall(ff);
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if(!ff) {
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processors[index] = 1;
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netdata_log_error("Cannot open file '%s'. Assuming system has %ld processors.", filename, processors[index]);
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return processors[index];
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}
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long tmp_processors = 0;
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unsigned int i;
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for(i = 0; i < procfile_lines(ff); i++) {
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if(!procfile_linewords(ff, i)) continue;
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if(strncmp(procfile_lineword(ff, i, 0), "cpu", 3) == 0)
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tmp_processors++;
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}
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procfile_close(ff);
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processors[index] = --tmp_processors;
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if(processors[index] < 1)
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processors[index] = 1;
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netdata_log_debug(D_SYSTEM, "System has %ld processors.", processors[index]);
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return processors[index];
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#endif /* __APPLE__, __FreeBSD__ */
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}
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pid_t pid_max = 32768;
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pid_t get_system_pid_max(void) {
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#ifdef __APPLE__
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// As we currently do not know a solution to query pid_max from the os
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// we use the number defined in bsd/sys/proc_internal.h in XNU sources
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pid_max = 99999;
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return pid_max;
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#elif __FreeBSD__
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int32_t tmp_pid_max;
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if (unlikely(GETSYSCTL_BY_NAME("kern.pid_max", tmp_pid_max))) {
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pid_max = 99999;
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netdata_log_error("Assuming system's maximum pid is %d.", pid_max);
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} else {
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pid_max = tmp_pid_max;
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}
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return pid_max;
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#else
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static char read = 0;
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if(unlikely(read)) return pid_max;
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read = 1;
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char filename[FILENAME_MAX + 1];
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snprintfz(filename, FILENAME_MAX, "%s/proc/sys/kernel/pid_max", netdata_configured_host_prefix?netdata_configured_host_prefix:"");
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unsigned long long max = 0;
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if(read_single_number_file(filename, &max) != 0) {
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netdata_log_error("Cannot open file '%s'. Assuming system supports %d pids.", filename, pid_max);
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return pid_max;
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}
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if(!max) {
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netdata_log_error("Cannot parse file '%s'. Assuming system supports %d pids.", filename, pid_max);
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return pid_max;
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}
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pid_max = (pid_t) max;
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return pid_max;
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#endif /* __APPLE__, __FreeBSD__ */
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}
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unsigned int system_hz;
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void get_system_HZ(void) {
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long ticks;
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if ((ticks = sysconf(_SC_CLK_TCK)) == -1) {
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netdata_log_error("Cannot get system clock ticks");
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}
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system_hz = (unsigned int) ticks;
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}
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static inline unsigned long cpuset_str2ul(char **s) {
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unsigned long n = 0;
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char c;
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for(c = **s; c >= '0' && c <= '9' ; c = *(++*s)) {
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n *= 10;
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n += c - '0';
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}
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return n;
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}
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unsigned long read_cpuset_cpus(const char *filename, long system_cpus) {
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static char *buf = NULL;
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static size_t buf_size = 0;
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if(!buf) {
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buf_size = 100U + 6 * system_cpus; // taken from kernel/cgroup/cpuset.c
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buf = mallocz(buf_size + 1);
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}
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int ret = read_file(filename, buf, buf_size);
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if(!ret) {
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char *s = buf;
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unsigned long ncpus = 0;
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// parse the cpuset string and calculate the number of cpus the cgroup is allowed to use
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while (*s) {
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if (isspace(*s)) {
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s++;
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continue;
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}
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unsigned long n = cpuset_str2ul(&s);
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ncpus++;
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if(*s == ',') {
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s++;
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continue;
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}
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if(*s == '-') {
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s++;
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unsigned long m = cpuset_str2ul(&s);
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ncpus += m - n; // calculate the number of cpus in the region
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}
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s++;
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}
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if(!ncpus)
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return 0;
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return ncpus;
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}
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return 0;
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}
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// =====================================================================================================================
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// FreeBSD
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#if __FreeBSD__
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const char *os_type = "freebsd";
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int getsysctl_by_name(const char *name, void *ptr, size_t len) {
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size_t nlen = len;
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if (unlikely(sysctlbyname(name, ptr, &nlen, NULL, 0) == -1)) {
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netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
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return 1;
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}
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if (unlikely(nlen != len)) {
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netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
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return 1;
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}
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return 0;
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}
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int getsysctl_simple(const char *name, int *mib, size_t miblen, void *ptr, size_t len) {
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size_t nlen = len;
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if (unlikely(!mib[0]))
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if (unlikely(getsysctl_mib(name, mib, miblen)))
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return 1;
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if (unlikely(sysctl(mib, miblen, ptr, &nlen, NULL, 0) == -1)) {
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netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
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return 1;
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}
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if (unlikely(nlen != len)) {
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netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
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return 1;
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}
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return 0;
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}
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int getsysctl(const char *name, int *mib, size_t miblen, void *ptr, size_t *len) {
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size_t nlen = *len;
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if (unlikely(!mib[0]))
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if (unlikely(getsysctl_mib(name, mib, miblen)))
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return 1;
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if (unlikely(sysctl(mib, miblen, ptr, len, NULL, 0) == -1)) {
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netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
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return 1;
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}
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if (unlikely(ptr != NULL && nlen != *len)) {
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netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)*len, (unsigned long)nlen);
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return 1;
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}
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return 0;
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}
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int getsysctl_mib(const char *name, int *mib, size_t len) {
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size_t nlen = len;
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if (unlikely(sysctlnametomib(name, mib, &nlen) == -1)) {
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netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
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return 1;
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}
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if (unlikely(nlen != len)) {
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netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
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return 1;
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}
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return 0;
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}
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#endif
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// =====================================================================================================================
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// MacOS
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#if __APPLE__
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const char *os_type = "macos";
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int getsysctl_by_name(const char *name, void *ptr, size_t len) {
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size_t nlen = len;
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if (unlikely(sysctlbyname(name, ptr, &nlen, NULL, 0) == -1)) {
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netdata_log_error("MACOS: sysctl(%s...) failed: %s", name, strerror(errno));
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return 1;
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}
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if (unlikely(nlen != len)) {
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netdata_log_error("MACOS: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
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return 1;
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}
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return 0;
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}
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#endif
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// =====================================================================================================================
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// Linux
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#if __linux__
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const char *os_type = "linux";
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#endif
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