| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | #include "../libnetdata.h" |
| 4 | |
| 5 | pid_t pid_max = 4194304; |
| 6 | |
| 7 | pid_t os_get_system_pid_max(void) { |
| 8 | static bool read = false; |
| 9 | if(read) return pid_max; |
| 10 | read = true; |
| 11 | |
| 12 | #if defined(OS_MACOS) |
| 13 | int mib[2]; |
| 14 | int maxproc; |
| 15 | size_t len = sizeof(maxproc); |
| 16 | |
| 17 | mib[0] = CTL_KERN; |
| 18 | mib[1] = KERN_MAXPROC; |
| 19 | |
| 20 | if (sysctl(mib, 2, &maxproc, &len, NULL, 0) == -1) { |
| 21 | pid_max = 99999; // Fallback value |
| 22 | nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot find system max pid. Assuming %d.", pid_max); |
| 23 | } |
| 24 | else pid_max = (pid_t)maxproc; |
| 25 | |
| 26 | return pid_max; |
| 27 | |
| 28 | #elif defined(OS_FREEBSD) |
| 29 | |
| 30 | int32_t tmp_pid_max; |
| 31 | |
| 32 | if (unlikely(GETSYSCTL_BY_NAME("kern.pid_max", tmp_pid_max))) { |
| 33 | pid_max = 99999; |
| 34 | nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot get system max pid. Assuming %d.", pid_max); |
| 35 | } |
| 36 | else |
| 37 | pid_max = tmp_pid_max; |
| 38 | |
| 39 | return pid_max; |
| 40 | |
| 41 | #elif defined(OS_LINUX) |
| 42 | |
| 43 | char filename[FILENAME_MAX + 1]; |
| 44 | snprintfz(filename, FILENAME_MAX, "%s/proc/sys/kernel/pid_max", netdata_configured_host_prefix?netdata_configured_host_prefix:""); |
| 45 | |
| 46 | unsigned long long max = 0; |
| 47 | if(read_single_number_file(filename, &max) != 0) { |
| 48 | nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot open file '%s'. Assuming system supports %d pids.", filename, pid_max); |
| 49 | return pid_max; |
| 50 | } |
| 51 | |
| 52 | if(!max) { |
| 53 | nd_log(NDLS_DAEMON, NDLP_ERR, "Cannot parse file '%s'. Assuming system supports %d pids.", filename, pid_max); |
| 54 | return pid_max; |
| 55 | } |
| 56 | |
| 57 | pid_max = (pid_t) max; |
| 58 | return pid_max; |
| 59 | |
| 60 | #elif defined(OS_WINDOWS) |
| 61 | |
| 62 | pid_max = (pid_t)0x7FFFFFFF; |
| 63 | return pid_max; |
| 64 | |
| 65 | #else |
| 66 | |
| 67 | // return the default |
| 68 | return pid_max; |
| 69 | |
| 70 | #endif |
| 71 | } |