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ELF note scanner

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This commit is contained in:
albert 2002-10-07 01:48:47 +00:00
parent ed7540e6ae
commit 623c2d9bc5
1 changed files with 31 additions and 2 deletions
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33
proc/sysinfo.c
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@ -117,9 +117,10 @@ int uptime(double *uptime_secs, double *idle_secs) {
* used with a kernel that doesn't support the ELF note. On some other
* architectures there may be a system call or sysctl() that will work.
*/
unsigned long long Hertz;
static void init_Hertz_value(void) __attribute__((constructor));
static void init_Hertz_value(void){
static void init_Hertz_value_old(void){
unsigned long long user_j, nice_j, sys_j, other_j; /* jiffies (clock ticks) */
double up_1, up_2, seconds;
unsigned long long jiffies;
@ -170,6 +171,34 @@ static void init_Hertz_value(void){
}
}
#ifndef AT_CLKTCK
#define AT_CLKTCK 17 /* frequency of times() */
#endif
extern char** environ;
/* for ELF executables, notes are pushed before environment and args */
static unsigned long find_elf_note(unsigned long findme){
unsigned long *ep = (unsigned long *)environ;
unsigned long ret = 42;
while(*ep++);
while(*ep++);
while(*ep){
// printf("%08lx %08lx %011ld %011ld%s\n",ep[0],ep[1],ep[0],ep[1],ep[0]==findme?" <<<":"");
if(ep[0]==findme) ret=ep[1];
ep+=2;
}
return ret;
}
static void init_Hertz_value(void) __attribute__((constructor));
static void init_Hertz_value(void){
Hertz = find_elf_note(AT_CLKTCK);
if(Hertz==42) init_Hertz_value_old();
else smp_num_cpus = sysconf(_SC_NPROCESSORS_CONF);
if(smp_num_cpus<1) smp_num_cpus=1; /* SPARC glibc is buggy */
}
/***********************************************************************
* The /proc filesystem calculates idle=jiffies-(user+nice+sys) and we
* recover jiffies by adding up the 4 or 5 numbers we are given. SMP kernels