compiler-rt/test/sanitizer_common/TestCases/Posix/feof_fileno_ferror.cpp

   1 // RUN: %clangxx -g %s -o %t && %run %t
   2
   3 // Newer versions of Android have FDSan, and will fail this test as FDSan will
   4 // catch the error instead.
   5 // UNSUPPORTED: android
   6
   7 #include <assert.h>
   8 #include <stdio.h>
   9 #include <unistd.h>
  10
  11 int main(int argc, char **argv) {
  12   FILE *fp = fopen(argv[0], "r");
  13   assert(fp);
  14
  15   // file should be good upon opening
  16   assert(!feof(fp) && !ferror(fp));
  17
  18   // read until EOF
  19   char buf[BUFSIZ];
  20   while (fread(buf, 1, sizeof buf, fp) != 0) {}
  21   assert(feof(fp));
  22
  23   // clear EOF
  24   clearerr(fp);
  25   assert(!feof(fp) && !ferror(fp));
  26
  27   // get file descriptor
  28   int fd = fileno(fp);
  29   assert(fd != -1);
  30
  31   // break the file by closing underlying descriptor
  32   assert(close(fd) != -1);
  33
  34   // verify that an error is signalled
  35   assert(fread(buf, 1, sizeof buf, fp) == 0);
  36   assert(ferror(fp));
  37
  38   // clear error
  39   clearerr(fp);
  40   assert(!feof(fp) && !ferror(fp));
  41
  42   // fclose() will return EBADF because of closed fd
  43   assert(fclose(fp) == -1);
  44   return 0;
  45 }