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
|
#include <mlvalues.h>
#include <alloc.h>
#include <memory.h>
#include "unix.h"
#ifdef HAS_WAITPID
#include <sys/types.h>
#include <sys/wait.h>
static int wait_flag_table[] = {
WNOHANG, WUNTRACED
};
value unix_waitpid(flags, pid_req)
value flags, pid_req;
{
int pid, status;
value res;
Push_roots(r, 1);
#define st r[0]
pid = waitpid(Int_val(pid_req), &status,
convert_flag_list(flags, wait_flag_table));
if (pid == -1) uerror("waitpid", Nothing);
switch (status & 0xFF) {
case 0:
st = alloc(1, 0);
Field(st, 0) = Val_int((status >> 8) & 0xFF);
break;
case 0177:
st = alloc(1, 2);
Field(st, 0) = Val_int((status >> 8) & 0xFF);
break;
default:
st = alloc(2, 1);
Field(st, 0) = Val_int(status & 0x3F);
Field(st, 1) = status & 0200 ? Val_true : Val_false;
break;
}
res = alloc_tuple(2);
Field(res, 0) = Val_int(pid);
Field(res, 1) = st;
Pop_roots();
return res;
}
#else
value unix_waitpid() { invalid_argument("waitpid not implemented"); }
#endif
|
