#ifndef H_PROC
#define H_PROC

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <alloca.h>
#include <limits.h>

static inline int
is_pid_alive(unsigned pid)
{
	char path[PATH_MAX];
	snprintf(path, sizeof path, "/proc/%u", pid);

	return access(path, F_OK) == 0;
}

static inline int 
proc_get_ppid(unsigned pid)
{
	char path[PATH_MAX];
	snprintf(path, sizeof path, "/proc/%u/stat", pid);
	
	FILE* fp;
	if ((fp = fopen(path, "r")) == NULL)
		goto err;

	char stat[4096];

	if (fread(stat, sizeof(char), sizeof stat, fp) == 0)
		goto err;

	fclose(fp);

	char unused;
	int ppid;
	sscanf(strrchr(stat, ')') + 1, " %c %d", &unused, &ppid);

	return ppid;

err:
	if (fp)	fclose(fp);

	return -1;
}

#endif