/*
// AUTHOR
// N. Nielsen
//
// LICENSE
// This software is in the public domain.
//
// The software is provided "as is", without warranty of any kind,
// express or implied, including but not limited to the warranties
// of merchantability, fitness for a particular purpose, and
// noninfringement. In no event shall the author(s) be liable for any
// claim, damages, or other liability, whether in an action of
// contract, tort, or otherwise, arising from, out of, or in connection
// with the software or the use or other dealings in the software.
//
// SUPPORT
// Send bug reports to: <nielsen@memberwebs.com>
//
*/

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include "getjail.h"

#define 	PROC_STATUS_PATH	"/proc/%d/status"

int getpidjail(pid_t pid, char* buff)
{
	int fd;
	size_t bytes;
	off_t off;

	/* Format the file name */
	if(snprintf(buff, JAIL_BUFF_SIZE, PROC_STATUS_PATH, pid))
	{
		/* Open the file */
		if((fd = open(buff, O_RDONLY)) >= 0)
		{
			/* Seek to the last bit */
			off = lseek(fd, SEEK_END, 0);

			if(off != -1)
			{
				off -= JAIL_BUFF_SIZE;
				if(off < 0) off = 0;
				lseek(fd, SEEK_SET, off);

				if((bytes = read(fd, buff, JAIL_BUFF_SIZE - 1)) > 0)
				{
					/* Okay now jailname should be the last token */
					while(isspace(buff[bytes - 1]))
						bytes--;

					buff[bytes] = 0;

					while(!isspace(buff[bytes - 1]))
						bytes--;

					memmove(buff, buff + bytes, JAIL_BUFF_SIZE - bytes);
					return 0;

				}
			}
		}
	}

	return -1;
}