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
|
/*
Emulation of BSD usleep()
Note that this is not a complete emulation in that
it destroys any pre-existing setitimer(), but it's
good enough for programs which don't have interval
timers running across calls on usleep(). It does
save and restore an existing SIGALRM handler.
*/
#ifdef USLEEP
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/signal.h>
#include <sys/time.h>
#ifdef Solaris
typedef void (*signalFUNC)(int);
#define signal(a, b) sigset(a, (signalFUNC) b)
#define signalFUNCreturn (signalFUNC)
#endif
#ifndef signalFUNCreturn
#define signalFUNCreturn
#endif
#ifdef FLUSH
#include <termios.h>
int flush_fd = -1; /* File descriptor for auto-flush */
#endif
volatile static int waiting;
static void getalrm(int i)
{
waiting = 0;
}
void sf_usleep(unsigned t)
{
static struct itimerval it;
void (*oldsig)();
oldsig = signalFUNCreturn signal(SIGALRM, getalrm);
#ifdef FLUSH
#define FLUSHTIME 100000 /* Flush interval in microseconds */
if (flush_fd != -1) {
while (t > FLUSHTIME) {
it.it_value.tv_sec = 0;
it.it_value.tv_usec = FLUSHTIME;
t -= FLUSHTIME;
tcflush(flush_fd, TCIFLUSH);
waiting = 1;
if (setitimer(ITIMER_REAL, &it, NULL))
return /*error*/;
while (waiting) {
pause();
}
(void) signal(SIGALRM, getalrm);
}
}
#endif
it.it_value.tv_sec = t / 1000000;
it.it_value.tv_usec = t % 1000000;
waiting = 1;
if (setitimer(ITIMER_REAL, &it, NULL))
return /*error*/;
while (waiting) {
pause();
}
signal(SIGALRM, oldsig);
}
#endif
|
