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/* Test for /proc/self/fd (or /dev/fd) pathname construction.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <fd_to_filename.h>
#include <stdio.h>
#include <support/check.h>
#include <support/xunistd.h>
/* Run a check on one value. */
static void
check (int value)
{
if (value < 0)
/* Negative descriptor values violate the precondition. */
return;
struct fd_to_filename storage;
char *actual = __fd_to_filename (value, &storage);
char expected[100];
snprintf (expected, sizeof (expected), FD_TO_FILENAME_PREFIX "%d", value);
TEST_COMPARE_STRING (actual, expected);
}
/* Check various ranges constructed around powers. */
static void
check_ranges (int base)
{
unsigned int power = 1;
do
{
for (int factor = 1; factor < base; ++factor)
for (int shift = -1000; shift <= 1000; ++shift)
check (factor * power + shift);
}
while (!__builtin_mul_overflow (power, base, &power));
}
/* Check that it is actually possible to use a the constructed
name. */
static void
check_open (void)
{
int pipes[2];
xpipe (pipes);
struct fd_to_filename storage;
int read_alias = xopen (__fd_to_filename (pipes[0], &storage), O_RDONLY, 0);
int write_alias = xopen (__fd_to_filename (pipes[1], &storage), O_WRONLY, 0);
/* Ensure that all the descriptor numbers are different. */
TEST_VERIFY (pipes[0] < pipes[1]);
TEST_VERIFY (pipes[1] < read_alias);
TEST_VERIFY (read_alias < write_alias);
xwrite (write_alias, "1", 1);
char buf[16];
TEST_COMPARE_BLOB ("1", 1, buf, read (pipes[0], buf, sizeof (buf)));
xwrite (pipes[1], "2", 1);
TEST_COMPARE_BLOB ("2", 1, buf, read (read_alias, buf, sizeof (buf)));
xwrite (write_alias, "3", 1);
TEST_COMPARE_BLOB ("3", 1, buf, read (read_alias, buf, sizeof (buf)));
xwrite (pipes[1], "4", 1);
TEST_COMPARE_BLOB ("4", 1, buf, read (pipes[0], buf, sizeof (buf)));
xclose (write_alias);
xclose (read_alias);
xclose (pipes[1]);
xclose (pipes[0]);
}
static int
do_test (void)
{
check_ranges (2);
check_ranges (10);
check_open ();
return 0;
}
#include <support/test-driver.c>
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