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TOMOYO Linux Cross Reference
Linux/tools/testing/selftests/proc/proc-self-wchan.c

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  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 
 22 int 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] != '')
 38                 return 1;
 39         return 0;
 40 }
 41 

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