ref: 826769af8a3fd2c2f7ba5347f2c7a384c6bb1cd5
dir: /sys/src/libc/9sys/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);
}