ref: bc7d74f09b53c39ada4e73ce73c01c6c0928f9f4
dir: /sys/src/cmd/unix/drawterm/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);
}