trdarena.c - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
trdarena.c (1693B)
---
1 #include "stdinc.h"
2 #include "dat.h"
3 #include "fns.h"
4
5 static int verbose, quiet;
6
7 void
8 usage(void)
9 {
10 fprint(2, "usage: rdarena [-qv] arenapart arena\n");
11 threadexitsall(0);
12 }
13
14 static void
15 rdarena(Arena *arena)
16 {
17 ZBlock *b;
18 u64int a, e;
19 u32int bs;
20
21 if (!quiet) {
22 fprint(2, "copying %s to standard output\n", arena->name);
23 printarena(2, arena);
24 }
25
26 bs = MaxIoSize;
27 if(bs < arena->blocksize)
28 bs = arena->blocksize;
29
30 b = alloczblock(bs, 0, arena->blocksize);
31 e = arena->base + arena->size + arena->blocksize;
32 for(a = arena->base - arena->blocksize; a + arena->blocksize <= e; a += bs){
33 if(a + bs > e)
34 bs = arena->blocksize;
35 if(readpart(arena->part, a, b->data, bs) < 0)
36 fprint(2, "can't copy %s, read at %lld failed: %r\n", arena->name, a);
37 if(write(1, b->data, bs) != bs)
38 sysfatal("can't copy %s, write at %lld failed: %r", arena->name, a);
39 }
40
41 freezblock(b);
42 }
43
44 void
45 threadmain(int argc, char *argv[])
46 {
47 ArenaPart *ap;
48 Part *part;
49 char *file, *aname;
50 int i;
51
52 ventifmtinstall();
53 statsinit();
54
55 ARGBEGIN{
56 case 'q':
57 quiet++;
58 break;
59 case 'v':
60 verbose++;
61 break;
62 default:
63 usage();
64 break;
65 }ARGEND
66
67 readonly = 1;
68
69 if(argc != 2)
70 usage();
71
72 file = argv[0];
73 aname = argv[1];
74
75 part = initpart(file, OREAD|ODIRECT);
76 if(part == nil)
77 sysfatal("can't open partition %s: %r", file);
78
79 ap = initarenapart(part);
80 if(ap == nil)
81 sysfatal("can't initialize arena partition in %s: %r", file);
82
83 if(verbose)
84 printarenapart(2, ap);
85
86 initdcache(8 * MaxDiskBlock);
87
88 for(i = 0; i < ap->narenas; i++){
89 if(strcmp(ap->arenas[i]->name, aname) == 0){
90 rdarena(ap->arenas[i]);
91 threadexitsall(0);
92 }
93 }
94
95 sysfatal("couldn't find arena %s", aname);
96 }