1 /*
2 * NAME:
3 * usleep -- This is the precision timer for Test Set
4 * Automation. It uses the select(2) system
5 * call to delay for the desired number of
6 * micro-seconds. This call returns ZERO
7 * (which is usually ignored) on successful
8 * completion, -1 otherwise.
9 *
10 * ALGORITHM:
11 * 1) We range check the passed in microseconds and log a
12 * warning message if appropriate. We then return without
13 * delay, flagging an error.
14 * 2) Load the Seconds and micro-seconds portion of the
15 * interval timer structure.
16 * 3) Call select(2) with no file descriptors set, just the
17 * timer, this results in either delaying the proper
18 * ammount of time or being interupted early by a signal.
19 *
20 * HISTORY:
21 * Added when the need for a subsecond timer was evident.
22 *
23 * AUTHOR:
24 * Michael J. Dyer Telephone: AT&T 414.647.4044
25 * General Electric Medical Systems GE DialComm 8 *767.4044
26 * P.O. Box 414 Mail Stop 12-27 Sect'y AT&T 414.647.4584
27 * Milwaukee, Wisconsin USA 53201 8 *767.4584
28 * internet: mike@sherlock.med.ge.com GEMS WIZARD e-mail: DYER
29 */
30
31 #include "vice.h"
32
33 #ifndef HAVE_USLEEP
34
35 #if defined(HAVE_UNISTD_H) && !defined(AMIGA_MORPHOS)
36 #include <unistd.h>
37 #endif
38
39 #include <stdlib.h>
40 #include <stdio.h>
41 #include <errno.h>
42 #include <time.h>
43 #include <sys/time.h>
44 #include <sys/types.h>
45
46 #ifdef AMIGA_MORPHOS
47 #include <proto/socket.h>
48 # define select(nfds, read_fds, write_fds, except_fds, timeout) \
49 WaitSelect(nfds, read_fds, write_fds, except_fds, timeout, NULL)
50 #endif
51
52
53 /* FIXME: this is a replacement function for a standardfunction that should come
54 with your c-library in the first place. it is only used in a few
55 sound-drivers and some hw-sid drivers - and it probably shouldnt be
56 used even there, instead a target specific vice_usleep should be
57 implemented, which really waits the requested delay (and no more, and
58 no less) */
usleep(unsigned long int microSeconds)59 int usleep(unsigned long int microSeconds)
60 {
61 unsigned int Seconds, uSec;
62 int nfds, readfds, writefds, exceptfds;
63 struct timeval Timer;
64
65 fprintf(stderr,
66 "%s:%d:%s(): I'm surprised anyone actually compiled VICE for an OS"
67 " that doesn't supply usleep(). -- compyx 2020-07-05\n",
68 __FILE__, __LINE__, __func__);
69 abort();
70 nfds = readfds = writefds = exceptfds = 0;
71
72 if ((microSeconds == (unsigned long) 0) || microSeconds > (unsigned long) 4000000) {
73 errno = ERANGE; /* value out of range */
74 return -1;
75 }
76
77 Seconds = microSeconds / (unsigned long) 1000000;
78 uSec = microSeconds % (unsigned long) 1000000;
79
80 Timer.tv_sec = Seconds;
81 Timer.tv_usec = uSec;
82
83 if (select(nfds, &readfds, &writefds, &exceptfds, &Timer) < 0) {
84 return -1;
85 }
86
87 return 0;
88 }
89 #endif
90