1 #include "all.h"
2 #include "io.h"
3
4 Mconf mconf;
5
6 static void
mconfinit(void)7 mconfinit(void)
8 {
9 int nf, pgsize = 0;
10 ulong size, userpgs = 0, userused = 0;
11 char *ln, *sl;
12 char *fields[2];
13 Biobuf *bp;
14 Mbank *mbp;
15
16 size = 64*MB;
17 bp = Bopen("#c/swap", OREAD);
18 if (bp != nil) {
19 while ((ln = Brdline(bp, '\n')) != nil) {
20 ln[Blinelen(bp)-1] = '\0';
21 nf = tokenize(ln, fields, nelem(fields));
22 if (nf != 2)
23 continue;
24 if (strcmp(fields[1], "pagesize") == 0)
25 pgsize = atoi(fields[0]);
26 else if (strcmp(fields[1], "user") == 0) {
27 sl = strchr(fields[0], '/');
28 if (sl == nil)
29 continue;
30 userpgs = atol(sl+1);
31 userused = atol(fields[0]);
32 }
33 }
34 Bterm(bp);
35 if (pgsize > 0 && userpgs > 0)
36 size = (((userpgs - userused)*3LL)/4)*pgsize;
37 }
38 mconf.memsize = size;
39 mbp = mconf.bank;
40 mbp->base = 0x10000000; /* fake addresses */
41 mbp->limit = mbp->base + size;
42 mbp++;
43
44 mconf.nbank = mbp - mconf.bank;
45 }
46
47 ulong
meminit(void)48 meminit(void)
49 {
50 conf.nmach = 1;
51 mconfinit();
52 return mconf.memsize;
53 }
54
55 /*
56 * based on libthread's threadsetname, but drags in less library code.
57 * actually just sets the arguments displayed.
58 */
59 void
procsetname(char * fmt,...)60 procsetname(char *fmt, ...)
61 {
62 int fd;
63 char *cmdname;
64 char buf[128];
65 va_list arg;
66
67 va_start(arg, fmt);
68 cmdname = vsmprint(fmt, arg);
69 va_end(arg);
70 if (cmdname == nil)
71 return;
72 snprint(buf, sizeof buf, "#p/%d/args", getpid());
73 if((fd = open(buf, OWRITE)) >= 0){
74 write(fd, cmdname, strlen(cmdname)+1);
75 close(fd);
76 }
77 free(cmdname);
78 }
79
80 void
newproc(void (* f)(void *),void * arg,char * text)81 newproc(void (*f)(void *), void *arg, char *text)
82 {
83 int kid = rfork(RFPROC|RFMEM|RFNOWAIT);
84
85 if (kid < 0)
86 sysfatal("can't fork: %r");
87 if (kid == 0) {
88 procsetname("%s", text);
89 (*f)(arg);
90 exits("child returned");
91 }
92 }
93