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-rw-r--r--libnetdata/os.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/libnetdata/os.c b/libnetdata/os.c
new file mode 100644
index 000000000..0248eb627
--- /dev/null
+++ b/libnetdata/os.c
@@ -0,0 +1,218 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "os.h"
+
+// ----------------------------------------------------------------------------
+// system functions
+// to retrieve settings of the system
+
+int processors = 1;
+long get_system_cpus(void) {
+ processors = 1;
+
+#ifdef __APPLE__
+ int32_t tmp_processors;
+
+ if (unlikely(GETSYSCTL_BY_NAME("hw.logicalcpu", tmp_processors))) {
+ error("Assuming system has %d processors.", processors);
+ } else {
+ processors = tmp_processors;
+ }
+
+ return processors;
+#elif __FreeBSD__
+ int32_t tmp_processors;
+
+ if (unlikely(GETSYSCTL_BY_NAME("hw.ncpu", tmp_processors))) {
+ error("Assuming system has %d processors.", processors);
+ } else {
+ processors = tmp_processors;
+ }
+
+ return processors;
+#else
+
+ char filename[FILENAME_MAX + 1];
+ snprintfz(filename, FILENAME_MAX, "%s/proc/stat", netdata_configured_host_prefix);
+
+ procfile *ff = procfile_open(filename, NULL, PROCFILE_FLAG_DEFAULT);
+ if(!ff) {
+ error("Cannot open file '%s'. Assuming system has %d processors.", filename, processors);
+ return processors;
+ }
+
+ ff = procfile_readall(ff);
+ if(!ff) {
+ error("Cannot open file '%s'. Assuming system has %d processors.", filename, processors);
+ return processors;
+ }
+
+ 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) processors++;
+ }
+ processors--;
+ if(processors < 1) processors = 1;
+
+ procfile_close(ff);
+
+ debug(D_SYSTEM, "System has %d processors.", processors);
+ return processors;
+
+#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;
+ 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);
+
+ unsigned long long max = 0;
+ if(read_single_number_file(filename, &max) != 0) {
+ error("Cannot open file '%s'. Assuming system supports %d pids.", filename, pid_max);
+ return pid_max;
+ }
+
+ if(!max) {
+ 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) {
+ error("Cannot get system clock ticks");
+ }
+
+ system_hz = (unsigned int) ticks;
+}
+
+// =====================================================================================================================
+// FreeBSD
+
+#if (TARGET_OS == OS_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)) {
+ error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ 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)) {
+ error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ 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)) {
+ error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(ptr != NULL && nlen != *len)) {
+ 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)) {
+ error("FREEBSD: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ error("FREEBSD: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
+ return 1;
+ }
+ return 0;
+}
+
+
+#endif
+
+
+// =====================================================================================================================
+// MacOS
+
+#if (TARGET_OS == OS_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)) {
+ error("MACOS: sysctl(%s...) failed: %s", name, strerror(errno));
+ return 1;
+ }
+ if (unlikely(nlen != len)) {
+ error("MACOS: sysctl(%s...) expected %lu, got %lu", name, (unsigned long)len, (unsigned long)nlen);
+ return 1;
+ }
+ return 0;
+}
+
+#endif // (TARGET_OS == OS_MACOS)
+