tests/test-mkfifoat.c

   1 /* Tests of mkfifoat and mknodat.
   2    Copyright (C) 2009-2025 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 Eric Blake <ebb9@byu.net>, 2009.  */
  18
  19 #include <config.h>
  20
  21 #include <sys/stat.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (mkfifoat, int, (int, char const *, mode_t));
  25 SIGNATURE_CHECK (mknodat, int, (int, char const *, mode_t, dev_t));
  26
  27 #include <fcntl.h>
  28 #include <errno.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include "ignore-value.h"
  35 #include "macros.h"
  36
  37 #define BASE "test-mkfifoat.t"
  38
  39 #include "test-mkfifo.h"
  40
  41 typedef int (*test_func) (int, char const *, mode_t);
  42
  43 static int dfd = AT_FDCWD;
  44
  45 /* Wrapper to test mknodat like mkfifoat.  */
  46 static int
  47 test_mknodat (int fd, char const *name, mode_t mode)
  48 {
  49   /* This is the only portable use of mknodat, per POSIX.  */
  50   return mknodat (fd, name, mode | S_IFIFO, 0);
  51 }
  52
  53 /* Wrapper to test mkfifoat like mkfifo.  */
  54 static int
  55 do_mkfifoat (char const *name, mode_t mode)
  56 {
  57   return mkfifoat (dfd, name, mode);
  58 }
  59
  60 /* Wrapper to test mknodat like mkfifo.  */
  61 static int
  62 do_mknodat (char const *name, mode_t mode)
  63 {
  64   return mknodat (dfd, name, mode | S_IFIFO, 0);
  65 }
  66
  67 int
  68 main (void)
  69 {
  70   int i;
  71   test_func funcs[2] = { mkfifoat, test_mknodat };
  72   int result;
  73
  74   /* Remove any leftovers from a previous partial run.  */
  75   ignore_value (system ("rm -rf " BASE "*"));
  76
  77   /* Basic tests.  */
  78   result = test_mkfifo (do_mkfifoat, true);
  79   ASSERT (test_mkfifo (do_mknodat, false) == result);
  80   dfd = open (".", O_RDONLY);
  81   ASSERT (0 <= dfd);
  82   ASSERT (test_mkfifo (do_mkfifoat, false) == result);
  83   ASSERT (test_mkfifo (do_mknodat, false) == result);
  84
  85   /* Test directory-relative handling of both functions.  */
  86   for (i = 0; i < 2; i++)
  87     {
  88       struct stat st;
  89       test_func func = funcs[i];
  90
  91       /* Test behaviour for invalid file descriptors.  */
  92       {
  93         errno = 0;
  94         ASSERT (func (-1, "foo", 0600) == -1);
  95         ASSERT (errno == EBADF
  96                 || errno == ENOSYS /* seen on mingw */
  97                );
  98       }
  99       {
 100         close (99);
 101         errno = 0;
 102         ASSERT (func (99, "foo", 0600) == -1);
 103         ASSERT (errno == EBADF
 104                 || errno == ENOSYS /* seen on mingw */
 105                );
 106       }
 107
 108       /* Create fifo while cwd is '.', then stat it from '..'.  */
 109       if (func (AT_FDCWD, BASE "fifo", 0600) != 0)
 110         ASSERT (errno == ENOSYS); /* seen on native Windows */
 111       else
 112         {
 113           errno = 0;
 114           ASSERT (func (dfd, BASE "fifo", 0600) == -1);
 115           ASSERT (errno == EEXIST);
 116           ASSERT (chdir ("..") == 0);
 117           errno = 0;
 118           ASSERT (fstatat (AT_FDCWD, BASE "fifo", &st, 0) == -1);
 119           ASSERT (errno == ENOENT);
 120           memset (&st, 0, sizeof st);
 121           ASSERT (fstatat (dfd, BASE "fifo", &st, 0) == 0);
 122           ASSERT (S_ISFIFO (st.st_mode));
 123           ASSERT (unlinkat (dfd, BASE "fifo", 0) == 0);
 124         }
 125
 126       /* Create fifo while cwd is '..', then stat it from '.'.  */
 127       if (func (dfd, BASE "fifo", 0600) != 0)
 128         ASSERT (errno == ENOSYS); /* seen on native Windows */
 129       else
 130         {
 131           ASSERT (fchdir (dfd) == 0);
 132           errno = 0;
 133           ASSERT (func (AT_FDCWD, BASE "fifo", 0600) == -1);
 134           ASSERT (errno == EEXIST);
 135           memset (&st, 0, sizeof st);
 136           ASSERT (fstatat (AT_FDCWD, BASE "fifo", &st, AT_SYMLINK_NOFOLLOW)
 137                   == 0);
 138           ASSERT (S_ISFIFO (st.st_mode));
 139           memset (&st, 0, sizeof st);
 140           ASSERT (fstatat (dfd, BASE "fifo", &st, AT_SYMLINK_NOFOLLOW) == 0);
 141           ASSERT (S_ISFIFO (st.st_mode));
 142           ASSERT (unlink (BASE "fifo") == 0);
 143         }
 144     }
 145
 146   ASSERT (close (dfd) == 0);
 147
 148   return test_exit_status;
 149 }