41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
|
/*
|
||
|
|
* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
|
||
|
|
*
|
||
|
|
* Permission to use, copy, modify, and distribute this software for any
|
||
|
|
* purpose with or without fee is hereby granted, provided that the above
|
||
|
|
* copyright notice and this permission notice appear in all copies.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||
|
|
*/
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
char buf[64];
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
fd = open("/proc/self/wchan", O_RDONLY);
|
||
|
|
if (fd == -1) {
|
||
|
|
if (errno == ENOENT)
|
||
|
|
return 2;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf[0] = '\0';
|
||
|
|
if (read(fd, buf, sizeof(buf)) != 1)
|
||
|
|
return 1;
|
||
|
|
if (buf[0] != '0')
|
||
|
|
return 1;
|
||
|
|
return 0;
|
||
|
|
}
|