static unsigned get_kernel_HZ(void)
{
if (kernel_HZ)
return kernel_HZ;
/* Works for ELF only, Linux 2.4.0+ */
kernel_HZ = find_elf_note(AT_CLKTCK);
if (kernel_HZ == (unsigned)-1)
kernel_HZ = get_HZ_by_waiting();
G.seconds_since_boot = get_uptime();
return kernel_HZ;
}
static void init_libproc(void){
// ought to count CPUs in /proc/stat instead of relying
// on glibc, which foolishly tries to parse /proc/cpuinfo
//
// SourceForge has an old Alpha running Linux 2.2.20 that
// appears to have a non-SMP kernel on a 2-way SMP box.
// _SC_NPROCESSORS_CONF returns 2, resulting in HZ=512
// _SC_NPROCESSORS_ONLN returns 1, which should work OK
smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if(smp_num_cpus<1) smp_num_cpus=1; /* SPARC glibc is buggy */
if(linux_version_code > LINUX_VERSION(2, 4, 0)){
Hertz = find_elf_note(AT_CLKTCK);
if(Hertz!=NOTE_NOT_FOUND) return;
fputs("2.4+ kernel w/o ELF notes? -- report this\n", stderr);
}
old_Hertz_hack();
}
static unsigned get_kernel_HZ(void)
{
//char buf[64];
struct sysinfo info;
if (kernel_HZ)
return kernel_HZ;
/* Works for ELF only, Linux 2.4.0+ */
kernel_HZ = find_elf_note(AT_CLKTCK);
if (kernel_HZ == (unsigned)-1)
kernel_HZ = get_HZ_by_waiting();
//if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
// bb_perror_msg_and_die("can't read %s", "/proc/uptime");
//buf[sizeof(buf)-1] = '\0';
///sscanf(buf, "%llu", &seconds_since_boot);
sysinfo(&info);
seconds_since_boot = info.uptime;
return kernel_HZ;
}