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
|
#include <common.h>
/**
** User function S: exit, sleep, write
**
** Reports itself, then loops forever, sleeping on each iteration
**
** Invoked as: userS x [ s ]
** where x is the ID character
** s is the sleep time (defaults to 20)
*/
USERMAIN(main)
{
char ch = 's'; // default character to print
int nap = 20; // nap time
char buf[128];
// process the command-line arguments
switch (argc) {
case 3:
nap = str2int(argv[2], 10);
// FALL THROUGH
case 2:
ch = argv[1][0];
break;
default:
sprint(buf, "userS: argc %d, args: ", argc);
cwrites(buf);
for (int i = 0; i <= argc; ++i) {
sprint(buf, " %s", argv[argc] ? argv[argc] : "(null)");
cwrites(buf);
}
cwrites("\n");
}
// announce our presence
write(CHAN_SIO, &ch, 1);
sprint(buf, "userS sleeping %d(%d)\n", nap, SEC_TO_MS(nap));
cwrites(buf);
for (;;) {
sleep(SEC_TO_MS(nap));
write(CHAN_SIO, &ch, 1);
}
sprint(buf, "!! %c exiting!?!?!?\n", ch);
cwrites(buf);
exit(1);
return (42); // shut the compiler up!
}
|
