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c1760eaf3b
To help detect common kinds of memory (and other resource) management bugs, GCC 11 adds support for the detection of mismatched calls to allocation and deallocation functions. At each call site to a known deallocation function GCC checks the set of allocation functions the former can be paired with and, if the two don't match, issues a -Wmismatched-dealloc warning (something similar happens in C++ for mismatched calls to new and delete). GCC also uses the same mechanism to detect attempts to deallocate objects not allocated by any allocation function (or pointers past the first byte into allocated objects) by -Wfree-nonheap-object. This support is enabled for built-in functions like malloc and free. To extend it beyond those, GCC extends attribute malloc to designate a deallocation function to which pointers returned from the allocation function may be passed to deallocate the allocated objects. Another, optional argument designates the positional argument to which the pointer must be passed. This change is the first step in enabling this extended support for Glibc.
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/* Test freopen with mmap stdio.
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Copyright (C) 2002-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <support/check.h>
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#include <support/temp_file.h>
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static int fd;
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static char *name;
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static void
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do_prepare (int argc, char *argv[])
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{
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fd = create_temp_file ("tst-freopen.", &name);
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TEST_VERIFY_EXIT (fd != -1);
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}
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#define PREPARE do_prepare
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/* Basic tests for freopen. */
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static void
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do_test_basic (void)
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{
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const char * const test = "Let's test freopen.\n";
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char temp[strlen (test) + 1];
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FILE *f = fdopen (fd, "w");
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if (f == NULL)
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FAIL_EXIT1 ("fdopen: %m");
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fputs (test, f);
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fclose (f);
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f = fopen (name, "r");
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if (f == NULL)
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FAIL_EXIT1 ("fopen: %m");
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if (fread (temp, 1, strlen (test), f) != strlen (test))
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FAIL_EXIT1 ("fread: %m");
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temp [strlen (test)] = '\0';
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if (strcmp (test, temp))
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FAIL_EXIT1 ("read different string than was written: (%s, %s)",
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test, temp);
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f = freopen (name, "r+", f);
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if (f == NULL)
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FAIL_EXIT1 ("freopen: %m");
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if (fseek (f, 0, SEEK_SET) != 0)
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FAIL_EXIT1 ("fseek: %m");
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if (fread (temp, 1, strlen (test), f) != strlen (test))
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FAIL_EXIT1 ("fread: %m");
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temp [strlen (test)] = '\0';
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if (strcmp (test, temp))
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FAIL_EXIT1 ("read different string than was written: (%s, %s)",
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test, temp);
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fclose (f);
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}
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#if defined __GNUC__ && __GNUC__ >= 11
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/* Force an error to detect incorrectly making freopen a deallocator
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for its last argument via attribute malloc. The function closes
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the stream without deallocating it so either the argument or
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the pointer returned from the function (but not both) can be passed
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to fclose. */
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#pragma GCC diagnostic push
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#pragma GCC diagnostic error "-Wmismatched-dealloc"
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#endif
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/* Verify that freopen returns stream. */
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static void
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do_test_return_stream (void)
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{
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FILE *f1 = fopen (name, "r");
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if (f1 == NULL)
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FAIL_EXIT1 ("fopen: %m");
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FILE *f2 = freopen (name, "r+", f1);
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if (f2 == NULL)
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FAIL_EXIT1 ("freopen: %m");
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/* Verify that freopen isn't declared with the no-argument attribute
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malloc (which could let GCC fold the inequality to false). */
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if (f1 != f2)
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FAIL_EXIT1 ("freopen returned a different stream");
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/* This shouldn't trigger -Wmismatched-dealloc. */
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fclose (f1);
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}
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#if defined __GNUC__ && __GNUC__ >= 11
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/* Pop -Wmismatched-dealloc set to error above. */
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# pragma GCC diagnostic pop
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#endif
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/* Test for BZ#21398, where it tries to freopen stdio after the close
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of its file descriptor. */
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static void
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do_test_bz21398 (void)
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{
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(void) close (STDIN_FILENO);
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FILE *f = freopen (name, "r", stdin);
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if (f == NULL)
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FAIL_EXIT1 ("freopen: %m");
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TEST_VERIFY_EXIT (ferror (f) == 0);
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char buf[128];
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char *ret = fgets (buf, sizeof (buf), stdin);
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TEST_VERIFY_EXIT (ret != NULL);
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TEST_VERIFY_EXIT (ferror (f) == 0);
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}
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static int
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do_test (void)
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{
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do_test_basic ();
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do_test_bz21398 ();
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do_test_return_stream ();
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return 0;
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}
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#include <support/test-driver.c>
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