blob: b8303474fbe7880ef71636980b62d31b566821df (
plain)
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
|
#include <u.h>
#include <libc.h>
static
char*
skip(char *p)
{
while(*p == ' ')
p++;
while(*p != ' ' && *p != 0)
p++;
return p;
}
/*
* after a fork with fd's copied, both fd's are pointing to
* the same Chan structure. Since the offset is kept in the Chan
* structure, the seek's and read's in the two processes can be
* are competing moving the offset around. Hence the unusual loop
* in the middle of this routine.
*/
long
times(long *t)
{
char b[200], *p;
static int f = -1;
int i, retries;
ulong r;
memset(b, 0, sizeof(b));
for(retries = 0; retries < 100; retries++){
if(f < 0)
f = open("/dev/cputime", OREAD|OCEXEC);
if(f < 0)
break;
if(seek(f, 0, 0) < 0 || (i = read(f, b, sizeof(b))) < 0){
close(f);
f = -1;
} else {
if(i != 0)
break;
}
}
p = b;
if(t)
t[0] = atol(p);
p = skip(p);
if(t)
t[1] = atol(p);
p = skip(p);
r = atol(p);
if(t){
p = skip(p);
t[2] = atol(p);
p = skip(p);
t[3] = atol(p);
}
return r;
}
|
