tests/test-open.h

   1 /* Test of opening a file descriptor.
   2    Copyright (C) 2007-2018 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 /* Make test_open always inline if we're using Fortify, which defines
  20    __always_inline to do that.  Do nothing otherwise.  This works
  21    around a glibc bug whereby 'open' cannot be used as a function
  22    pointer when _FORTIFY_SOURCE is positive.  */
  23
  24 #if __GLIBC__ && defined __always_inline
  25 # define ALWAYS_INLINE __always_inline
  26 #else
  27 # define ALWAYS_INLINE
  28 #endif
  29
  30 /* This file is designed to test both open(n,buf[,mode]) and
  31    openat(AT_FDCWD,n,buf[,mode]).  FUNC is the function to test.
  32    Assumes that BASE and ASSERT are already defined, and that
  33    appropriate headers are already included.  If PRINT, warn before
  34    skipping symlink tests with status 77.  */
  35
  36 static ALWAYS_INLINE int
  37 test_open (int (*func) (char const *, int, ...), bool print)
  38 {
  39   int fd;
  40   /* Remove anything from prior partial run.  */
  41   unlink (BASE "file");
  42
  43   /* Cannot create directory.  */
  44   errno = 0;
  45   ASSERT (func ("nonexist.ent/", O_CREAT | O_RDONLY, 0600) == -1);
  46   ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
  47           || errno == EINVAL);
  48
  49   /* Create a regular file.  */
  50   fd = func (BASE "file", O_CREAT | O_RDONLY, 0600);
  51   ASSERT (0 <= fd);
  52   ASSERT (close (fd) == 0);
  53
  54   /* Trailing slash handling.  */
  55   errno = 0;
  56   ASSERT (func (BASE "file/", O_RDONLY) == -1);
  57   ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
  58
  59   /* Directories cannot be opened for writing.  */
  60   errno = 0;
  61   ASSERT (func (".", O_WRONLY) == -1);
  62   ASSERT (errno == EISDIR || errno == EACCES);
  63
  64   /* /dev/null must exist, and be writable.  */
  65   fd = func ("/dev/null", O_RDONLY);
  66   ASSERT (0 <= fd);
  67   {
  68     char c;
  69     ASSERT (read (fd, &c, 1) == 0);
  70   }
  71   ASSERT (close (fd) == 0);
  72   fd = func ("/dev/null", O_WRONLY);
  73   ASSERT (0 <= fd);
  74   ASSERT (write (fd, "c", 1) == 1);
  75   ASSERT (close (fd) == 0);
  76
  77   /* Although O_NONBLOCK on regular files can be ignored, it must not
  78      cause a failure.  */
  79   fd = func (BASE "file", O_NONBLOCK | O_RDONLY);
  80   ASSERT (0 <= fd);
  81   ASSERT (close (fd) == 0);
  82
  83   /* Symlink handling, where supported.  */
  84   if (symlink (BASE "file", BASE "link") != 0)
  85     {
  86       ASSERT (unlink (BASE "file") == 0);
  87       if (print)
  88         fputs ("skipping test: symlinks not supported on this file system\n",
  89                stderr);
  90       return 77;
  91     }
  92   errno = 0;
  93   ASSERT (func (BASE "link/", O_RDONLY) == -1);
  94   ASSERT (errno == ENOTDIR);
  95   fd = func (BASE "link", O_RDONLY);
  96   ASSERT (0 <= fd);
  97   ASSERT (close (fd) == 0);
  98
  99   /* Cleanup.  */
 100   ASSERT (unlink (BASE "file") == 0);
 101   ASSERT (unlink (BASE "link") == 0);
 102
 103   return 0;
 104 }