ref: 9ff908d2e99557534056889b6673d7710c37a4c7
dir: /libc/getpid.c/
#include <u.h>
#include <libc.h>
int
getpid(void)
{
char b[20];
int f;
memset(b, 0, sizeof(b));
f = open("#c/pid", 0);
if(f >= 0) {
read(f, b, sizeof(b));
close(f);
}
return atol(b);
}