149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/* Test freopen with mmap stdio.
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Copyright (C) 2002-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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