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
|
/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License. */
/* */
/***********************************************************************/
/* $Id$ */
#include <mlvalues.h>
#include <alloc.h>
#include <memory.h>
#include <signals.h>
#include "unixsupport.h"
#ifdef HAS_SELECT
#include <sys/types.h>
#include <sys/time.h>
#ifdef HAS_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef __OpenBSD__
#include <string.h>
#endif
#ifdef FD_ISSET
typedef fd_set file_descr_set;
#else
typedef int file_descr_set;
#define FD_SETSIZE (sizeof(int) * 8)
#define FD_SET(fd,fds) (*(fds) |= 1 << (fd))
#define FD_CLR(fd,fds) (*(fds) &= ~(1 << (fd)))
#define FD_ISSET(fd,fds) (*(fds) & (1 << (fd)))
#define FD_ZERO(fds) (*(fds) = 0)
#endif
static void fdlist_to_fdset(value fdlist, file_descr_set *fdset)
{
value l;
FD_ZERO(fdset);
for (l = fdlist; l != Val_int(0); l = Field(l, 1)) {
FD_SET(Int_val(Field(l, 0)), fdset);
}
}
static value fdset_to_fdlist(file_descr_set *fdset)
{
int i;
value res = Val_int(0);
Begin_root(res);
for (i = FD_SETSIZE - 1; i >= 0; i--) {
if (FD_ISSET(i, fdset)) {
value newres = alloc_small(2, 0);
Field(newres, 0) = Val_int(i);
Field(newres, 1) = res;
res = newres;
}
}
End_roots();
return res;
}
value unix_select(value readfds, value writefds, value exceptfds, value timeout) /* ML */
{
file_descr_set read, write, except;
double tm;
struct timeval tv;
struct timeval * tvp;
int retcode;
value res;
value read_list = Val_unit, write_list = Val_unit, except_list = Val_unit;
Begin_roots3 (read_list, write_list, except_list);
fdlist_to_fdset(readfds, &read);
fdlist_to_fdset(writefds, &write);
fdlist_to_fdset(exceptfds, &except);
tm = Double_val(timeout);
if (tm < 0.0)
tvp = (struct timeval *) NULL;
else {
tv.tv_sec = (int) tm;
tv.tv_usec = (int) (1e6 * (tm - (int) tm));
tvp = &tv;
}
enter_blocking_section();
retcode = select(FD_SETSIZE, &read, &write, &except, tvp);
leave_blocking_section();
if (retcode == -1) uerror("select", Nothing);
read_list = fdset_to_fdlist(&read);
write_list = fdset_to_fdlist(&write);
except_list = fdset_to_fdlist(&except);
res = alloc_small(3, 0);
Field(res, 0) = read_list;
Field(res, 1) = write_list;
Field(res, 2) = except_list;
End_roots();
return res;
}
#else
value unix_select(value readfds, value writefds, value exceptfds, value timeout)
{ invalid_argument("select not implemented"); }
#endif
|
