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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*--------------------------------------------------------------------*/
/*--- Startup: search PATH for an executable initimg-pathscan.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2011 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_debuglog.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcfile.h"
#include "pub_core_libcproc.h"
#include "pub_core_libcprint.h"
#include "pub_core_xarray.h"
#include "pub_core_clientstate.h"
#include "pub_core_aspacemgr.h"
#include "pub_core_mallocfree.h"
#include "pub_core_machine.h"
#include "pub_core_ume.h"
#include "pub_core_options.h"
#include "pub_core_tooliface.h" /* VG_TRACK */
#include "pub_core_initimg.h" /* self */
#include "priv_initimg_pathscan.h"
/*====================================================================*/
/*=== Find executable ===*/
/*====================================================================*/
/* Scan a colon-separated list, and call a function on each element.
The string must be mutable, because we insert a temporary '\0', but
the string will end up unmodified. (*func) should return True if it
doesn't need to see any more.
This routine will return True if (*func) returns True and False if
it reaches the end of the list without that happening.
*/
static Bool scan_colsep(char *colsep, Bool (*func)(const char *))
{
char *cp, *entry;
int end;
if (colsep == NULL ||
*colsep == '\0')
return False;
entry = cp = colsep;
do {
end = (*cp == '\0');
if (*cp == ':' || *cp == '\0') {
char save = *cp;
*cp = '\0';
if ((*func)(entry)) {
*cp = save;
return True;
}
*cp = save;
entry = cp+1;
}
cp++;
} while(!end);
return False;
}
/* Need a static copy because can't use dynamic mem allocation yet */
static HChar executable_name_in [VKI_PATH_MAX];
static HChar executable_name_out[VKI_PATH_MAX];
static Bool match_executable(const char *entry)
{
HChar buf[VG_(strlen)(entry) + VG_(strlen)(executable_name_in) + 3];
/* empty PATH element means '.' */
if (*entry == '\0')
entry = ".";
VG_(snprintf)(buf, sizeof(buf), "%s/%s", entry, executable_name_in);
// Don't match directories
if (VG_(is_dir)(buf))
return False;
// If we match an executable, we choose that immediately. If we find a
// matching non-executable we remember it but keep looking for an
// matching executable later in the path.
if (VG_(access)(buf, True/*r*/, False/*w*/, True/*x*/) == 0) {
VG_(strncpy)( executable_name_out, buf, VKI_PATH_MAX-1 );
executable_name_out[VKI_PATH_MAX-1] = 0;
return True; // Stop looking
} else if (VG_(access)(buf, True/*r*/, False/*w*/, False/*x*/) == 0
&& VG_STREQ(executable_name_out, ""))
{
VG_(strncpy)( executable_name_out, buf, VKI_PATH_MAX-1 );
executable_name_out[VKI_PATH_MAX-1] = 0;
return False; // Keep looking
} else {
return False; // Keep looking
}
}
// Returns NULL if it wasn't found.
HChar* ML_(find_executable) ( const HChar* exec )
{
vg_assert(NULL != exec);
if (VG_(strchr)(exec, '/')) {
// Has a '/' - use the name as is
VG_(strncpy)( executable_name_out, exec, VKI_PATH_MAX-1 );
} else {
// No '/' - we need to search the path
HChar* path;
VG_(strncpy)( executable_name_in, exec, VKI_PATH_MAX-1 );
VG_(memset) ( executable_name_out, 0, VKI_PATH_MAX );
path = VG_(getenv)("PATH");
scan_colsep(path, match_executable);
}
return VG_STREQ(executable_name_out, "") ? NULL : executable_name_out;
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
|
