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Diffstat (limited to '')
-rw-r--r-- | src/libnetdata/os/get_pid_max.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/libnetdata/os/get_pid_max.c b/src/libnetdata/os/get_pid_max.c new file mode 100644 index 000000000..70372a743 --- /dev/null +++ b/src/libnetdata/os/get_pid_max.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "../libnetdata.h" + +pid_t pid_max = 4194304; + +pid_t os_get_system_pid_max(void) { + static bool read = false; + if(read) return pid_max; + read = true; + +#if defined(OS_MACOS) + int mib[2]; + int maxproc; + size_t len = sizeof(maxproc); + + mib[0] = CTL_KERN; + mib[1] = KERN_MAXPROC; + + if (sysctl(mib, 2, &maxproc, &len, NULL, 0) == -1) { + pid_max = 99999; // Fallback value + nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot find system max pid. Assuming %d.", pid_max); + } + else pid_max = (pid_t)maxproc; + + return pid_max; + +#elif defined(OS_FREEBSD) + + int32_t tmp_pid_max; + + if (unlikely(GETSYSCTL_BY_NAME("kern.pid_max", tmp_pid_max))) { + pid_max = 99999; + nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot get system max pid. Assuming %d.", pid_max); + } + else + pid_max = tmp_pid_max; + + return pid_max; + +#elif defined(OS_LINUX) + + 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) { + nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot open file '%s'. Assuming system supports %d pids.", filename, pid_max); + return pid_max; + } + + if(!max) { + nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot parse file '%s'. Assuming system supports %d pids.", filename, pid_max); + return pid_max; + } + + pid_max = (pid_t) max; + return pid_max; + +#elif defined(OS_WINDOWS) + + pid_max = (pid_t)0x7FFFFFFF; + return pid_max; + +#else + + // return the default + return pid_max; + +#endif +} |