162306a36Sopenharmony_ci/* 262306a36Sopenharmony_ci * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> 362306a36Sopenharmony_ci * 462306a36Sopenharmony_ci * Permission to use, copy, modify, and distribute this software for any 562306a36Sopenharmony_ci * purpose with or without fee is hereby granted, provided that the above 662306a36Sopenharmony_ci * copyright notice and this permission notice appear in all copies. 762306a36Sopenharmony_ci * 862306a36Sopenharmony_ci * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 962306a36Sopenharmony_ci * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 1062306a36Sopenharmony_ci * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 1162306a36Sopenharmony_ci * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 1262306a36Sopenharmony_ci * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 1362306a36Sopenharmony_ci * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 1462306a36Sopenharmony_ci * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 1562306a36Sopenharmony_ci */ 1662306a36Sopenharmony_ci#include <sys/types.h> 1762306a36Sopenharmony_ci#include <sys/stat.h> 1862306a36Sopenharmony_ci#include <fcntl.h> 1962306a36Sopenharmony_ci#include <errno.h> 2062306a36Sopenharmony_ci#include <unistd.h> 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ciint main(void) 2362306a36Sopenharmony_ci{ 2462306a36Sopenharmony_ci char buf[64]; 2562306a36Sopenharmony_ci int fd; 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci fd = open("/proc/self/wchan", O_RDONLY); 2862306a36Sopenharmony_ci if (fd == -1) { 2962306a36Sopenharmony_ci if (errno == ENOENT) 3062306a36Sopenharmony_ci return 4; 3162306a36Sopenharmony_ci return 1; 3262306a36Sopenharmony_ci } 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci buf[0] = '\0'; 3562306a36Sopenharmony_ci if (read(fd, buf, sizeof(buf)) != 1) 3662306a36Sopenharmony_ci return 1; 3762306a36Sopenharmony_ci if (buf[0] != '0') 3862306a36Sopenharmony_ci return 1; 3962306a36Sopenharmony_ci return 0; 4062306a36Sopenharmony_ci} 41