git: 9front

ref: a0ba4c1f03a3f99fb17a9edf9b4448db49bb6c46
dir: /sys/src/libc/9sys/getppid.c/

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#include	<u.h>
#include	<libc.h>

int
getppid(void)
{
	char buf[32];
	int f;

	snprint(buf, sizeof(buf), "/proc/%lud/ppid", (ulong)getpid());
	f = open(buf, OREAD|OCEXEC);
	if(f < 0)
		return 0;
	memset(buf, 0, sizeof(buf));
	read(f, buf, sizeof(buf)-1);
	close(f);
	return atol(buf);
}