tests/ftruncate.c

   1 /* test whether ftruncte() can extend a file */
   2
   3 #if defined(HAVE_UNISTD_H)
   4 #include <unistd.h>
   5 #endif
   6
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <fcntl.h>
  10
  11 #define DATA "conftest.trunc"
  12 #define LEN 7663
  13
  14 int main(void)
  15 {
  16         int *buf;
  17         int fd = open(DATA,O_RDWR|O_CREAT|O_TRUNC,0666);
  18
  19         if (fd == -1) {
  20                 exit(1);
  21         }
  22
  23         ftruncate(fd, LEN);
  24
  25         unlink(DATA);
  26
  27         if (lseek(fd, 0, SEEK_END) == LEN) {
  28                 exit(0);
  29         }
  30         exit(1);
  31 }