blob: 782823e979c9d1c8f86505464a69f055417dab95 (
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
|
#include <common.h>
/**
** User function X: exit, write, getpid
**
** Prints its PID at start and exit, iterates printing its character
** N times, and exits with a status of 12.
**
** Invoked as: userX x n
** where x is the ID character
** n is the iteration count
*/
USERMAIN(main)
{
int count = 20; // iteration count
char ch = 'x'; // default character to print
char buf[128];
// process the command-line arguments
switch (argc) {
case 3:
count = str2int(argv[2], 10);
// FALL THROUGH
case 2:
ch = argv[1][0];
break;
default:
sprint(buf, "userX: 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
int pid = getpid();
sprint(buf, " %c[%d]", ch, pid);
swrites(buf);
for (int i = 0; i < count; ++i) {
swrites(buf);
DELAY(STD);
}
exit(12);
return (42); // shut the compiler up!
}
|
