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#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;
}
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