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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/* ufuncs - sleep and alarm functions that understand fractional values */
/* Copyright (C) 2008,2009-2020,2022 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "bashtypes.h"
#include "posixtime.h"
#if defined (HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <errno.h>
#if !defined (errno)
extern int errno;
#endif /* !errno */
#include "quit.h"
#if defined (HAVE_SELECT)
# include "posixselect.h"
# include "trap.h"
# include "stat-time.h"
#endif
#include "error.h"
/* A version of `alarm' using setitimer if it's available. */
#if defined (HAVE_SETITIMER)
unsigned int
falarm (unsigned int secs, unsigned int usecs)
{
struct itimerval it, oit;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
it.it_value.tv_sec = secs;
it.it_value.tv_usec = usecs;
if (setitimer(ITIMER_REAL, &it, &oit) < 0)
return (-1); /* XXX will be converted to unsigned */
/* Backwards compatibility with alarm(3) */
if (oit.it_value.tv_usec)
oit.it_value.tv_sec++;
return (oit.it_value.tv_sec);
}
#else
int
falarm (unsigned int secs, unsigned int usecs)
{
if (secs == 0 && usecs == 0)
return (alarm (0));
if (secs == 0 || usecs >= 500000)
{
secs++;
usecs = 0;
}
return (alarm (secs));
}
#endif /* !HAVE_SETITIMER */
/* A version of sleep using fractional seconds and select. I'd like to use
`usleep', but it's already taken */
#if defined (HAVE_NANOSLEEP)
static int
nsleep (unsigned int sec, unsigned int usec)
{
int r;
struct timespec req, rem;
req.tv_sec = sec;
req.tv_nsec = usec * 1000;
for (;;)
{
QUIT;
r = nanosleep (&req, &rem);
if (r == 0 || errno != EINTR)
return r;
req = rem;
}
return r;
}
#endif
#if defined (HAVE_TIMEVAL) && (defined (HAVE_SELECT) || defined (HAVE_PSELECT))
static int
ssleep (unsigned int sec, unsigned int usec)
{
int e, r;
sigset_t blocked_sigs;
# if defined (HAVE_PSELECT)
struct timespec ts;
# else
sigset_t prevmask;
struct timeval tv;
# endif
sigemptyset (&blocked_sigs);
# if defined (SIGCHLD)
sigaddset (&blocked_sigs, SIGCHLD);
# endif
# if defined (HAVE_PSELECT)
ts.tv_sec = sec;
ts.tv_nsec = usec * 1000;
# else
sigemptyset (&prevmask);
tv.tv_sec = sec;
tv.tv_usec = usec;
# endif /* !HAVE_PSELECT */
do
{
# if defined (HAVE_PSELECT)
r = pselect(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &ts, &blocked_sigs);
# else
sigprocmask (SIG_SETMASK, &blocked_sigs, &prevmask);
r = select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
sigprocmask (SIG_SETMASK, &prevmask, NULL);
# endif
e = errno;
if (r < 0 && errno == EINTR)
return -1; /* caller will handle XXX - QUIT;? */
errno = e;
}
while (r < 0 && errno == EINTR);
return r;
}
#endif
#if !defined (HAVE_SELECT)
static int
ancientsleep(unsigned int sec, unsigned int usec)
{
if (usec >= 500000) /* round */
sec++;
return (sleep(sec));
}
#endif
int
fsleep(unsigned int sec, unsigned int usec)
{
#if defined (HAVE_NANOSLEEP)
return (nsleep (sec, usec));
#elif defined (HAVE_TIMEVAL) && (defined (HAVE_SELECT) || defined (HAVE_PSELECT))
return (ssleep (sec, usec));
#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
return (ancientsleep (sec, usec));
#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */
}
|
