102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/* Test for /proc/self/fd (or /dev/fd) pathname construction.
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Copyright (C) 2020-2022 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 <fcntl.h>
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#include <fd_to_filename.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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/* Run a check on one value. */
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static void
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check (int value)
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{
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if (value < 0)
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/* Negative descriptor values violate the precondition. */
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return;
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struct fd_to_filename storage;
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char *actual = __fd_to_filename (value, &storage);
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char expected[100];
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snprintf (expected, sizeof (expected), FD_TO_FILENAME_PREFIX "%d", value);
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TEST_COMPARE_STRING (actual, expected);
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}
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/* Check various ranges constructed around powers. */
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static void
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check_ranges (int base)
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{
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unsigned int power = 1;
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do
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{
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for (int factor = 1; factor < base; ++factor)
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for (int shift = -1000; shift <= 1000; ++shift)
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check (factor * power + shift);
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}
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while (!__builtin_mul_overflow (power, base, &power));
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}
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/* Check that it is actually possible to use a the constructed
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name. */
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static void
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check_open (void)
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{
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int pipes[2];
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xpipe (pipes);
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struct fd_to_filename storage;
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int read_alias = xopen (__fd_to_filename (pipes[0], &storage), O_RDONLY, 0);
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int write_alias = xopen (__fd_to_filename (pipes[1], &storage), O_WRONLY, 0);
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/* Ensure that all the descriptor numbers are different. */
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TEST_VERIFY (pipes[0] < pipes[1]);
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TEST_VERIFY (pipes[1] < read_alias);
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TEST_VERIFY (read_alias < write_alias);
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xwrite (write_alias, "1", 1);
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char buf[16];
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TEST_COMPARE_BLOB ("1", 1, buf, read (pipes[0], buf, sizeof (buf)));
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xwrite (pipes[1], "2", 1);
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TEST_COMPARE_BLOB ("2", 1, buf, read (read_alias, buf, sizeof (buf)));
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xwrite (write_alias, "3", 1);
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TEST_COMPARE_BLOB ("3", 1, buf, read (read_alias, buf, sizeof (buf)));
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xwrite (pipes[1], "4", 1);
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TEST_COMPARE_BLOB ("4", 1, buf, read (pipes[0], buf, sizeof (buf)));
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xclose (write_alias);
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xclose (read_alias);
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xclose (pipes[1]);
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xclose (pipes[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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check_ranges (2);
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check_ranges (10);
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check_open ();
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return 0;
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}
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#include <support/test-driver.c>
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