1 | /* Test backtrace and backtrace_symbols for signal frames. |
2 | Copyright (C) 2011-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <execinfo.h> |
20 | #include <search.h> |
21 | #include <stdio.h> |
22 | #include <stdlib.h> |
23 | #include <string.h> |
24 | #include <sys/types.h> |
25 | #include <signal.h> |
26 | #include <unistd.h> |
27 | |
28 | #include "tst-backtrace.h" |
29 | |
30 | /* The backtrace should include at least handle_signal, a signal |
31 | trampoline, 3 * fn, and do_test. */ |
32 | #define NUM_FUNCTIONS 6 |
33 | |
34 | volatile int sig_handled = 0; |
35 | |
36 | void |
37 | handle_signal (int signum) |
38 | { |
39 | void *addresses[NUM_FUNCTIONS]; |
40 | char **symbols; |
41 | int n; |
42 | int i; |
43 | |
44 | sig_handled = 1; |
45 | |
46 | /* Get the backtrace addresses. */ |
47 | n = backtrace (array: addresses, size: sizeof (addresses) / sizeof (addresses[0])); |
48 | printf (format: "Obtained backtrace with %d functions (want at least %d)\n" , |
49 | n, NUM_FUNCTIONS); |
50 | /* Check that there are at least NUM_FUNCTIONS functions. */ |
51 | if (n < NUM_FUNCTIONS) |
52 | { |
53 | FAIL (); |
54 | /* Only return if we got no symbols at all. The partial output is |
55 | still useful for debugging failures. */ |
56 | if (n <= 0) |
57 | return; |
58 | } |
59 | /* Convert them to symbols. */ |
60 | symbols = backtrace_symbols (array: addresses, size: n); |
61 | /* Check that symbols were obtained. */ |
62 | if (symbols == NULL) |
63 | { |
64 | FAIL (); |
65 | return; |
66 | } |
67 | for (i = 0; i < n; ++i) |
68 | printf (format: "Function %d: %s\n" , i, symbols[i]); |
69 | /* Check that the function names obtained are accurate. */ |
70 | if (!match (sym: symbols[0], name: "handle_signal" )) |
71 | FAIL (); |
72 | /* Do not check name for signal trampoline. */ |
73 | for (i = 2; i < n - 1; i++) |
74 | if (!match (sym: symbols[i], name: "fn" )) |
75 | { |
76 | FAIL (); |
77 | return; |
78 | } |
79 | /* Symbol names are not available for static functions, so we do not |
80 | check do_test. */ |
81 | } |
82 | |
83 | NO_INLINE int |
84 | fn (int c) |
85 | { |
86 | pid_t parent_pid, child_pid; |
87 | |
88 | if (c > 0) |
89 | { |
90 | fn (c: c - 1); |
91 | return x; |
92 | } |
93 | |
94 | signal (SIGUSR1, handler: handle_signal); |
95 | parent_pid = getpid (); |
96 | |
97 | child_pid = fork (); |
98 | if (child_pid == (pid_t) -1) |
99 | abort (); |
100 | else if (child_pid == 0) |
101 | { |
102 | sleep (seconds: 1); |
103 | kill (pid: parent_pid, SIGUSR1); |
104 | _exit (0); |
105 | } |
106 | |
107 | /* In the parent. */ |
108 | while (sig_handled == 0) |
109 | ; |
110 | |
111 | return 0; |
112 | } |
113 | |
114 | NO_INLINE int |
115 | do_test (void) |
116 | { |
117 | fn (c: 2); |
118 | return ret; |
119 | } |
120 | |
121 | #include <support/test-driver.c> |
122 | |