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-rw-r--r--libnetdata/os.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/libnetdata/os.c b/libnetdata/os.c
new file mode 100644
index 00000000..e4624be6
--- /dev/null
+++ b/libnetdata/os.c
@@ -0,0 +1,300 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "os.h"
+
+// ----------------------------------------------------------------------------
+// system functions
+// to retrieve settings of the system
+
+#define CPUS_FOR_COLLECTORS 0
+#define CPUS_FOR_NETDATA 1
+
+long get_system_cpus_with_cache(bool cache, bool for_netdata) {
+ static long processors[2] = { 0, 0 };
+
+ int index = for_netdata ? CPUS_FOR_NETDATA : CPUS_FOR_COLLECTORS;
+
+ if(likely(cache && processors[index] > 0))
+ return processors[index];
+
+#if defined(__APPLE__) || defined(__FreeBSD__)
+#if defined(__APPLE__)
+#define HW_CPU_NAME "hw.logicalcpu"
+#else
+#define HW_CPU_NAME "hw.ncpu"
+#endif
+
+ int32_t tmp_processors;
+ bool error = false;
+
+ if (unlikely(GETSYSCTL_BY_NAME(HW_CPU_NAME, tmp_processors)))
+ error = true;
+ else
+ processors[index] = tmp_processors;
+
+ if(processors[index] < 1) {
+ processors[index] = 1;
+
+ if(error)
+ netdata_log_error("Assuming system has %d processors.", processors[index]);
+ }
+
+ return processors[index];
+#else
+
+ char filename[FILENAME_MAX + 1];
+ snprintfz(filename, FILENAME_MAX, "%s/proc/stat",
+ (!for_netdata && netdata_configured_host_prefix) ? netdata_configured_host_prefix : "");
+
+ procfile *ff = procfile_open(filename, NULL, PROCFILE_FLAG_DEFAULT);
+ if(!ff) {
+ processors[index] = 1;
+ netdata_log_error("Cannot open file '%s'. Assuming system has %ld processors.", filename, processors[index]);
+ return processors[index];
+ }
+
+ ff = procfile_readall(ff);
+ if(!ff) {
+ processors[index] = 1;
+ netdata_log_error("Cannot open file '%s'. Assuming system has %ld processors.", filename, processors[index]);
+ return processors[index];
+ }
+
+ long tmp_processors = 0;
+ unsigned int i;
+ for(i = 0; i < procfile_lines(ff); i++) {
+ if(!procfile_linewords(ff, i)) continue;
+
+ if(strncmp(procfile_lineword(ff, i, 0), "cpu", 3) == 0)
+ tmp_processors++;
+ }
+ procfile_close(ff);
+
+ processors[index] = --tmp_processors;
+
+ if(processors[index] < 1)
+ processors[index] = 1;
+
+ netdata_log_debug(D_SYSTEM, "System has %ld processors.", processors[index]);
+ return processors[index];
+
+#endif /* __APPLE__, __FreeBSD__ */
+}
+
+pid_t pid_max = 32768;
+pid_t get_system_pid_max(void) {
+#ifdef __APPLE__
+ // As we currently do not know a solution to query pid_max from the os
+ // we use the number defined in bsd/sys/proc_internal.h in XNU sources
+ pid_max = 99999;
+ return pid_max;
+#elif __FreeBSD__
+ int32_t tmp_pid_max;
+
+ if (unlikely(GETSYSCTL_BY_NAME("kern.pid_max", tmp_pid_max))) {
+ pid_max = 99999;
+ netdata_log_error("Assuming system's maximum pid is %d.", pid_max);
+ } else {
+ pid_max = tmp_pid_max;
+ }
+
+ return pid_max;
+#else
+
+ static char read = 0;
+ if(unlikely(read)) return pid_max;
+ read = 1;
+
+ char filename[FILENAME_MAX + 1];
+ snprintfz(filename, FILENAME_MAX, "%s/proc/sys/kernel/pid_max", netdata_configured_host_prefix?netdata_configured_host_prefix:"");
+
+ unsigned long long max = 0;
+ if(read_single_number_file(filename, &max) != 0) {
+ netdata_log_error("Cannot open file '%s'. Assuming system supports %d pids.", filename, pid_max);
+ return pid_max;
+ }
+
+ if(!max) {
+ netdata_log_error("Cannot parse file '%s'. Assuming system supports %d pids.", filename, pid_max);
+ return pid_max;
+ }
+
+ pid_max = (pid_t) max;
+ return pid_max;
+
+#endif /* __APPLE__, __FreeBSD__ */
+}
+
+unsigned int system_hz;
+void get_system_HZ(void) {
+ long ticks;
+
+ if ((ticks = sysconf(_SC_CLK_TCK)) == -1) {
+ netdata_log_error("Cannot get system clock ticks");
+ }
+
+ system_hz = (unsigned int) ticks;
+}
+
+static inline unsigned long cpuset_str2ul(char **s) {
+ unsigned long n = 0;
+ char c;
+ for(c = **s; c >= '0' && c <= '9' ; c = *(++*s)) {
+ n *= 10;
+ n += c - '0';
+ }
+ return n;
+}
+
+unsigned long read_cpuset_cpus(const char *filename, long system_cpus) {
+ static char *buf = NULL;
+ static size_t buf_size = 0;
+
+ if(!buf) {
+ buf_size = 100U + 6 * system_cpus; // taken from kernel/cgroup/cpuset.c
+ buf = mallocz(buf_size + 1);
+ }
+
+ int ret = read_file(filename, buf, buf_size);
+
+ if(!ret) {
+ char *s = buf;
+ unsigned long ncpus = 0;
+
+ // parse the cpuset string and calculate the number of cpus the cgroup is allowed to use
+ while (*s) {
+ if (isspace(*s)) {
+ s++;
+ continue;
+ }
+ unsigned long n = cpuset_str2ul(&s);
+ ncpus++;
+ if(*s == ',') {
+ s++;
+ continue;
+ }
+ if(*s == '-') {
+ s++;
+ unsigned long m = cpuset_str2ul(&s);
+ ncpus += m - n; // calculate the number of cpus in the region
+ }
+ s++;
+ }
+
+ if(!ncpus)
+ return 0;
+
+ return ncpus;
+ }
+
+ return 0;
+}
+
+// =====================================================================================================================
+// FreeBSD
+
+#if __FreeBSD__
+
+const char *os_type = "freebsd";
+
+int getsysctl_by_name(const char *name, void *ptr, size_t len) {
+ size_t nlen = len;
+
+ if (unlikely(sysctlbyname(name, ptr, &nlen, NULL, 0) == -1)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
+ return 1;
+ }
+ return 0;
+}
+
+int getsysctl_simple(const char *name, int *mib, size_t miblen, void *ptr, size_t len) {
+ size_t nlen = len;
+
+ if (unlikely(!mib[0]))
+ if (unlikely(getsysctl_mib(name, mib, miblen)))
+ return 1;
+
+ if (unlikely(sysctl(mib, miblen, ptr, &nlen, NULL, 0) == -1)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
+ return 1;
+ }
+
+ return 0;
+}
+
+int getsysctl(const char *name, int *mib, size_t miblen, void *ptr, size_t *len) {
+ size_t nlen = *len;
+
+ if (unlikely(!mib[0]))
+ if (unlikely(getsysctl_mib(name, mib, miblen)))
+ return 1;
+
+ if (unlikely(sysctl(mib, miblen, ptr, len, NULL, 0) == -1)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(ptr != NULL && nlen != *len)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)*len, (unsigned long)nlen);
+ return 1;
+ }
+
+ return 0;
+}
+
+int getsysctl_mib(const char *name, int *mib, size_t len) {
+ size_t nlen = len;
+
+ if (unlikely(sysctlnametomib(name, mib, &nlen) == -1)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ netdata_log_error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
+ return 1;
+ }
+ return 0;
+}
+
+
+#endif
+
+
+// =====================================================================================================================
+// MacOS
+
+#if __APPLE__
+
+const char *os_type = "macos";
+
+int getsysctl_by_name(const char *name, void *ptr, size_t len) {
+ size_t nlen = len;
+
+ if (unlikely(sysctlbyname(name, ptr, &nlen, NULL, 0) == -1)) {
+ netdata_log_error("MACOS: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ netdata_log_error("MACOS: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
+ return 1;
+ }
+ return 0;
+}
+
+#endif
+
+// =====================================================================================================================
+// Linux
+
+#if __linux__
+
+const char *os_type = "linux";
+
+#endif
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