books/apue/seekable.c

   1 /*
   2  * Check if a file specified in stdin is 'seekable'
   3  */
   4 #include <stdio.h>
   5 #include <sys/types.h>
   6 #include <unistd.h>
   7 #include <errno.h>
   8
   9 int main(void)
  10 {
  11         if (lseek(STDIN_FILENO, 0, SEEK_CUR) == -1 && errno == ESPIPE)
  12                 printf("cannot seek\n");
  13         else
  14                 printf("seek OK\n");
  15
  16         return 0;
  17 }