diff options
Diffstat (limited to 'libnetdata/os.c')
| -rw-r--r-- | libnetdata/os.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/libnetdata/os.c b/libnetdata/os.c new file mode 100644 index 0000000..0248eb6 --- /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) + |