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// SPDX-License-Identifier: GPL-3.0-or-later
#include "../libnetdata.h"
pid_t pid_max = 32768;
pid_t os_get_system_pid_max(void) {
#if defined(OS_MACOS)
// 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 defined(OS_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;
#elif defined(OS_LINUX)
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;
#else
// just a big default
pid_max = 4194304;
return pid_max;
#endif
}
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