cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

proc-self-wchan.c (1163B)

      1/*
      2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
      3 *
      4 * Permission to use, copy, modify, and distribute this software for any
      5 * purpose with or without fee is hereby granted, provided that the above
      6 * copyright notice and this permission notice appear in all copies.
      7 *
      8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15 */
     16#include <sys/types.h>
     17#include <sys/stat.h>
     18#include <fcntl.h>
     19#include <errno.h>
     20#include <unistd.h>
     21
     22int main(void)
     23{
     24	char buf[64];
     25	int fd;
     26
     27	fd = open("/proc/self/wchan", O_RDONLY);
     28	if (fd == -1) {
     29		if (errno == ENOENT)
     30			return 4;
     31		return 1;
     32	}
     33
     34	buf[0] = '\0';
     35	if (read(fd, buf, sizeof(buf)) != 1)
     36		return 1;
     37	if (buf[0] != '0')
     38		return 1;
     39	return 0;
     40}