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fa185f0d | 1 | /* Test for /proc/self/fd (or /dev/fd) pathname construction. |
2b778ceb | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
fa185f0d FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fcntl.h> | |
20 | #include <fd_to_filename.h> | |
21 | #include <stdio.h> | |
22 | #include <support/check.h> | |
23 | #include <support/xunistd.h> | |
24 | ||
25 | /* Run a check on one value. */ | |
26 | static void | |
27 | check (int value) | |
28 | { | |
29 | if (value < 0) | |
30 | /* Negative descriptor values violate the precondition. */ | |
31 | return; | |
32 | ||
33 | struct fd_to_filename storage; | |
34 | char *actual = __fd_to_filename (value, &storage); | |
35 | char expected[100]; | |
36 | snprintf (expected, sizeof (expected), FD_TO_FILENAME_PREFIX "%d", value); | |
37 | TEST_COMPARE_STRING (actual, expected); | |
38 | } | |
39 | ||
40 | /* Check various ranges constructed around powers. */ | |
41 | static void | |
42 | check_ranges (int base) | |
43 | { | |
44 | unsigned int power = 1; | |
45 | do | |
46 | { | |
47 | for (int factor = 1; factor < base; ++factor) | |
48 | for (int shift = -1000; shift <= 1000; ++shift) | |
49 | check (factor * power + shift); | |
50 | } | |
51 | while (!__builtin_mul_overflow (power, base, &power)); | |
52 | } | |
53 | ||
54 | /* Check that it is actually possible to use a the constructed | |
55 | name. */ | |
56 | static void | |
57 | check_open (void) | |
58 | { | |
59 | int pipes[2]; | |
60 | xpipe (pipes); | |
61 | ||
62 | struct fd_to_filename storage; | |
63 | int read_alias = xopen (__fd_to_filename (pipes[0], &storage), O_RDONLY, 0); | |
64 | int write_alias = xopen (__fd_to_filename (pipes[1], &storage), O_WRONLY, 0); | |
65 | ||
66 | /* Ensure that all the descriptor numbers are different. */ | |
67 | TEST_VERIFY (pipes[0] < pipes[1]); | |
68 | TEST_VERIFY (pipes[1] < read_alias); | |
69 | TEST_VERIFY (read_alias < write_alias); | |
70 | ||
71 | xwrite (write_alias, "1", 1); | |
72 | char buf[16]; | |
73 | TEST_COMPARE_BLOB ("1", 1, buf, read (pipes[0], buf, sizeof (buf))); | |
74 | ||
75 | xwrite (pipes[1], "2", 1); | |
76 | TEST_COMPARE_BLOB ("2", 1, buf, read (read_alias, buf, sizeof (buf))); | |
77 | ||
78 | xwrite (write_alias, "3", 1); | |
79 | TEST_COMPARE_BLOB ("3", 1, buf, read (read_alias, buf, sizeof (buf))); | |
80 | ||
81 | xwrite (pipes[1], "4", 1); | |
82 | TEST_COMPARE_BLOB ("4", 1, buf, read (pipes[0], buf, sizeof (buf))); | |
83 | ||
84 | xclose (write_alias); | |
85 | xclose (read_alias); | |
86 | xclose (pipes[1]); | |
87 | xclose (pipes[0]); | |
88 | } | |
89 | ||
90 | static int | |
91 | do_test (void) | |
92 | { | |
93 | check_ranges (2); | |
94 | check_ranges (10); | |
95 | ||
96 | check_open (); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | #include <support/test-driver.c> |