1 | /* Test for select timeout. |
2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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 <errno.h> |
20 | #include <intprops.h> |
21 | #include <support/capture_subprocess.h> |
22 | #include <support/check.h> |
23 | #include <support/support.h> |
24 | #include <support/timespec.h> |
25 | #include <support/xunistd.h> |
26 | #include <support/xtime.h> |
27 | #include <support/xsignal.h> |
28 | |
29 | struct child_args |
30 | { |
31 | int fds[2][2]; |
32 | struct timeval tmo; |
33 | }; |
34 | |
35 | static void |
36 | do_test_child (void *clousure) |
37 | { |
38 | struct child_args *args = (struct child_args *) clousure; |
39 | |
40 | close (fd: args->fds[0][1]); |
41 | close (fd: args->fds[1][0]); |
42 | |
43 | fd_set rfds; |
44 | FD_ZERO (&rfds); |
45 | FD_SET (args->fds[0][0], &rfds); |
46 | |
47 | struct timespec ts = xclock_now (CLOCK_REALTIME); |
48 | ts = timespec_add (ts, (struct timespec) { args->tmo.tv_sec, 0 }); |
49 | |
50 | int r = select (nfds: args->fds[0][0] + 1, readfds: &rfds, NULL, NULL, timeout: &args->tmo); |
51 | TEST_COMPARE (r, 0); |
52 | |
53 | if (support_select_modifies_timeout ()) |
54 | { |
55 | TEST_COMPARE (args->tmo.tv_sec, 0); |
56 | TEST_COMPARE (args->tmo.tv_usec, 0); |
57 | } |
58 | |
59 | TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts); |
60 | |
61 | xwrite (args->fds[1][1], "foo" , 3); |
62 | } |
63 | |
64 | static void |
65 | do_test_child_alarm (void *clousure) |
66 | { |
67 | struct child_args *args = (struct child_args *) clousure; |
68 | |
69 | support_create_timer (sec: 0, nsec: 100000000, false, NULL); |
70 | struct timeval tv = { .tv_sec = args->tmo.tv_sec, .tv_usec = 0 }; |
71 | int r = select (nfds: 0, NULL, NULL, NULL, timeout: &tv); |
72 | TEST_COMPARE (r, -1); |
73 | if (args->tmo.tv_sec > INT_MAX) |
74 | TEST_VERIFY (errno == EINTR || errno == EOVERFLOW); |
75 | else |
76 | { |
77 | TEST_COMPARE (errno, EINTR); |
78 | if (support_select_modifies_timeout ()) |
79 | TEST_VERIFY (tv.tv_sec < args->tmo.tv_sec); |
80 | } |
81 | } |
82 | |
83 | static int |
84 | do_test (void) |
85 | { |
86 | struct child_args args; |
87 | |
88 | xpipe (args.fds[0]); |
89 | xpipe (args.fds[1]); |
90 | |
91 | /* The child select should timeout and write on its pipe end. */ |
92 | args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 250000 }; |
93 | { |
94 | struct support_capture_subprocess result; |
95 | result = support_capture_subprocess (callback: do_test_child, closure: &args); |
96 | support_capture_subprocess_check (&result, context: "tst-select-child" , status_or_signal: 0, |
97 | allowed: sc_allow_none); |
98 | } |
99 | |
100 | if (support_select_normalizes_timeout ()) |
101 | { |
102 | /* This is handled as 1 second instead of failing with EINVAL. */ |
103 | args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 1000000 }; |
104 | struct support_capture_subprocess result; |
105 | result = support_capture_subprocess (callback: do_test_child, closure: &args); |
106 | support_capture_subprocess_check (&result, context: "tst-select-child" , status_or_signal: 0, |
107 | allowed: sc_allow_none); |
108 | } |
109 | |
110 | /* Same as before, but simulating polling. */ |
111 | args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 0 }; |
112 | { |
113 | struct support_capture_subprocess result; |
114 | result = support_capture_subprocess (callback: do_test_child, closure: &args); |
115 | support_capture_subprocess_check (&result, context: "tst-select-child" , status_or_signal: 0, |
116 | allowed: sc_allow_none); |
117 | } |
118 | |
119 | xclose (args.fds[0][0]); |
120 | xclose (args.fds[1][1]); |
121 | |
122 | args.tmo = (struct timeval) { .tv_sec = 10, .tv_usec = 0 }; |
123 | { |
124 | struct support_capture_subprocess result; |
125 | result = support_capture_subprocess (callback: do_test_child_alarm, closure: &args); |
126 | support_capture_subprocess_check (&result, context: "tst-select-child" , status_or_signal: 0, |
127 | allowed: sc_allow_none); |
128 | } |
129 | |
130 | args.tmo = (struct timeval) { .tv_sec = TYPE_MAXIMUM (time_t), |
131 | .tv_usec = 0 }; |
132 | { |
133 | struct support_capture_subprocess result; |
134 | result = support_capture_subprocess (callback: do_test_child_alarm, closure: &args); |
135 | support_capture_subprocess_check (&result, context: "tst-select-child" , status_or_signal: 0, |
136 | allowed: sc_allow_none); |
137 | } |
138 | |
139 | args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 0 }; |
140 | { |
141 | fd_set rfds; |
142 | FD_ZERO (&rfds); |
143 | FD_SET (args.fds[1][0], &rfds); |
144 | |
145 | int r = select (nfds: args.fds[1][0] + 1, readfds: &rfds, NULL, NULL, timeout: &args.tmo); |
146 | TEST_COMPARE (r, 1); |
147 | } |
148 | |
149 | return 0; |
150 | } |
151 | |
152 | #include <support/test-driver.c> |
153 | |