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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/****************************************************************/
/* mdso: midipix dso scavenger */
/* Copyright (C) 2015 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.MDSO. */
/****************************************************************/
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>
#include <mdso/mdso.h>
#include "mdso_driver_impl.h"
static int mdso_free_unit_ctx_impl(struct mdso_unit_ctx_impl * ctx, int status)
{
if (ctx) {
mdso_unmap_input(&ctx->map);
free(ctx);
}
return status;
}
static FILE * mdso_stdin_to_tmp(void)
{
FILE * ftmp;
char buf[4096];
ssize_t nread;
int ret;
if (!(ftmp = tmpfile()))
return 0;
nread = read(0,buf,sizeof(buf)-1);
while (nread) {
if (nread > 0) {
buf[nread] = '\0';
ret = fputs(buf,ftmp);
} else
ret = (errno == EINTR) ? 0 : -1;
if (ret < 0) {
fclose(ftmp);
return 0;
}
nread = read(0,buf,sizeof(buf)-1);
}
return ftmp;
}
int mdso_get_unit_ctx(
const struct mdso_driver_ctx * dctx,
const char * path,
struct mdso_unit_ctx ** pctx)
{
struct mdso_unit_ctx_impl * ctx;
FILE * ftmp;
int fd;
if (!dctx || !(ctx = calloc(sizeof(*ctx),1)))
return -1;
if (strcmp(path,"-"))
fd = -1;
else if (!(ftmp = mdso_stdin_to_tmp()))
return mdso_free_unit_ctx_impl(ctx,-1);
else if ((fd = dup(fileno(ftmp))) < 0)
return mdso_free_unit_ctx_impl(ctx,-1);
else
fclose(ftmp);
if (mdso_map_input(fd,path,PROT_READ,&ctx->map))
return mdso_free_unit_ctx_impl(ctx,-1);
if (fd > 0)
close(fd);
memcpy(&ctx->cctx,dctx->cctx,
sizeof(ctx->cctx));
ctx->path = path;
ctx->uctx.path = &ctx->path;
ctx->uctx.map = &ctx->map;
ctx->uctx.cctx = &ctx->cctx;
*pctx = &ctx->uctx;
return 0;
}
void mdso_free_unit_ctx(struct mdso_unit_ctx * ctx)
{
struct mdso_unit_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct mdso_unit_ctx_impl,uctx);
ictx = (struct mdso_unit_ctx_impl *)addr;
mdso_free_unit_ctx_impl(ictx,0);
}
}
|
