1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* Copyright (C) 2006-2019 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <stdlib.h>
static volatile int handler_called;
static void
handler (int sig)
{
handler_called = 1;
}
static int
do_test (void)
{
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
if (sigaction (SIGUSR1, &sa, NULL) != 0)
{
puts ("sigaction failed");
return 1;
}
sa.sa_handler = SIG_IGN;
if (sigaction (SIGCHLD, &sa, NULL) != 0)
{
puts ("2nd sigaction failed");
return 1;
}
sigset_t ss_usr1;
sigemptyset (&ss_usr1);
sigaddset (&ss_usr1, SIGUSR1);
if (sigprocmask (SIG_BLOCK, &ss_usr1, NULL) != 0)
{
puts ("sigprocmask failed");
return 1;
}
int fds[2][2];
if (pipe (fds[0]) != 0 || pipe (fds[1]) != 0)
{
puts ("pipe failed");
return 1;
}
fd_set rfds;
FD_ZERO (&rfds);
sigset_t ss;
sigprocmask (SIG_SETMASK, NULL, &ss);
sigdelset (&ss, SIGUSR1);
struct timespec to = { .tv_sec = 0, .tv_nsec = 500000000 };
pid_t parent = getpid ();
pid_t p = fork ();
if (p == 0)
{
close (fds[0][1]);
close (fds[1][0]);
FD_SET (fds[0][0], &rfds);
int e;
do
{
if (getppid () != parent)
exit (2);
errno = 0;
e = pselect (fds[0][0] + 1, &rfds, NULL, NULL, &to, &ss);
}
while (e == 0);
if (e != -1)
{
puts ("child: pselect did not fail");
return 0;
}
if (errno != EINTR)
{
puts ("child: pselect did not set errno to EINTR");
return 0;
}
TEMP_FAILURE_RETRY (write (fds[1][1], "foo", 3));
exit (0);
}
close (fds[0][0]);
close (fds[1][1]);
FD_SET (fds[1][0], &rfds);
kill (p, SIGUSR1);
int e = pselect (fds[1][0] + 1, &rfds, NULL, NULL, NULL, &ss);
if (e == -1)
{
puts ("parent: pselect failed");
return 1;
}
if (e != 1)
{
puts ("parent: pselect did not report readable fd");
return 1;
}
if (!FD_ISSET (fds[1][0], &rfds))
{
puts ("parent: pselect reports wrong fd");
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
