1 | #include <dlfcn.h> |
2 | #include <libintl.h> |
3 | #include <link.h> |
4 | #include <stdio.h> |
5 | #include <stdlib.h> |
6 | #include <string.h> |
7 | |
8 | #define MAPS ((struct link_map *) _r_debug.r_map) |
9 | |
10 | static int |
11 | check_loaded_objects (const char **loaded) |
12 | { |
13 | struct link_map *lm; |
14 | int n; |
15 | int *found = NULL; |
16 | int errors = 0; |
17 | |
18 | for (n = 0; loaded[n]; n++) |
19 | /* NOTHING */; |
20 | |
21 | if (n) |
22 | { |
23 | found = (int *) alloca (sizeof (int) * n); |
24 | memset (s: found, c: 0, n: sizeof (int) * n); |
25 | } |
26 | |
27 | printf(format: " Name\n" ); |
28 | printf(format: " --------------------------------------------------------\n" ); |
29 | for (lm = MAPS; lm; lm = lm->l_next) |
30 | { |
31 | if (lm->l_name && lm->l_name[0]) |
32 | printf(format: " %s, count = %d\n" , lm->l_name, (int) lm->l_direct_opencount); |
33 | if (lm->l_type == lt_loaded && lm->l_name) |
34 | { |
35 | int match = 0; |
36 | for (n = 0; loaded[n] != NULL; n++) |
37 | { |
38 | if (strcmp (s1: basename (filename: loaded[n]), s2: basename (filename: lm->l_name)) == 0) |
39 | { |
40 | found[n] = 1; |
41 | match = 1; |
42 | break; |
43 | } |
44 | } |
45 | |
46 | if (match == 0) |
47 | { |
48 | ++errors; |
49 | printf (format: "ERRORS: %s is not unloaded\n" , lm->l_name); |
50 | } |
51 | } |
52 | } |
53 | |
54 | for (n = 0; loaded[n] != NULL; n++) |
55 | { |
56 | if (found[n] == 0) |
57 | { |
58 | ++errors; |
59 | printf (format: "ERRORS: %s is not loaded\n" , loaded[n]); |
60 | } |
61 | } |
62 | |
63 | return errors; |
64 | } |
65 | |
66 | static int |
67 | load_dso (const char **loading, int undef, int flag) |
68 | { |
69 | void *obj; |
70 | const char *loaded[] = { NULL, NULL, NULL, NULL }; |
71 | int errors = 0; |
72 | const char *errstring; |
73 | |
74 | printf (format: "\nThis is what is in memory now:\n" ); |
75 | errors += check_loaded_objects (loaded); |
76 | |
77 | printf (format: "Loading shared object %s: %s\n" , loading[0], |
78 | flag == RTLD_LAZY ? "RTLD_LAZY" : "RTLD_NOW" ); |
79 | obj = dlopen (file: loading[0], mode: flag); |
80 | if (obj == NULL) |
81 | { |
82 | if (flag == RTLD_LAZY) |
83 | { |
84 | ++errors; |
85 | printf (format: "ERRORS: dlopen shouldn't fail for RTLD_LAZY\n" ); |
86 | } |
87 | |
88 | errstring = dlerror (); |
89 | if (strstr (haystack: errstring, needle: "undefined symbol" ) == 0 |
90 | || strstr (haystack: errstring, needle: "circlemod2_undefined" ) == 0) |
91 | { |
92 | ++errors; |
93 | printf (format: "ERRORS: dlopen: `%s': Invalid error string\n" , |
94 | errstring); |
95 | } |
96 | else |
97 | printf (format: "dlopen: %s\n" , errstring); |
98 | } |
99 | else |
100 | { |
101 | if (undef && flag == RTLD_NOW) |
102 | { |
103 | ++errors; |
104 | printf (format: "ERRORS: dlopen shouldn't work for RTLD_NOW\n" ); |
105 | } |
106 | |
107 | if (!undef) |
108 | { |
109 | int (*func) (void); |
110 | |
111 | func = dlsym (handle: obj, name: "circlemod1" ); |
112 | if (func == NULL) |
113 | { |
114 | ++errors; |
115 | printf (format: "ERRORS: cannot get address of \"circlemod1\": %s\n" , |
116 | dlerror ()); |
117 | } |
118 | else if (func () != 3) |
119 | { |
120 | ++errors; |
121 | printf (format: "ERRORS: function \"circlemod1\" returned wrong result\n" ); |
122 | } |
123 | } |
124 | |
125 | loaded[0] = loading[0]; |
126 | loaded[1] = loading[1]; |
127 | loaded[2] = loading[2]; |
128 | } |
129 | errors += check_loaded_objects (loaded); |
130 | |
131 | if (obj) |
132 | { |
133 | printf (format: "UnLoading shared object %s\n" , loading[0]); |
134 | dlclose (handle: obj); |
135 | loaded[0] = NULL; |
136 | loaded[1] = NULL; |
137 | loaded[2] = NULL; |
138 | errors += check_loaded_objects (loaded); |
139 | } |
140 | |
141 | return errors; |
142 | } |
143 | |
144 | int |
145 | main (void) |
146 | { |
147 | int errors = 0; |
148 | const char *loading[3]; |
149 | |
150 | loading[0] = "circlemod1a.so" ; |
151 | loading[1] = "circlemod2a.so" ; |
152 | loading[2] = "circlemod3a.so" ; |
153 | errors += load_dso (loading, undef: 0, RTLD_LAZY); |
154 | errors += load_dso (loading, undef: 0, RTLD_NOW); |
155 | |
156 | loading[0] = "circlemod1.so" ; |
157 | loading[1] = "circlemod2.so" ; |
158 | loading[2] = "circlemod3.so" ; |
159 | errors += load_dso (loading, undef: 1, RTLD_LAZY); |
160 | errors += load_dso (loading, undef: 1, RTLD_NOW); |
161 | |
162 | if (errors != 0) |
163 | printf (format: "%d errors found\n" , errors); |
164 | |
165 | return errors; |
166 | } |
167 | |