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31d470ac JM |
1 | /* Test backtrace and backtrace_symbols for signal frames, where a |
2 | system call was interrupted by a signal. | |
688903eb | 3 | Copyright (C) 2011-2018 Free Software Foundation, Inc. |
31d470ac JM |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <execinfo.h> | |
21 | #include <search.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/types.h> | |
26 | #include <signal.h> | |
27 | #include <unistd.h> | |
28 | ||
8c53a12c JM |
29 | #include "tst-backtrace.h" |
30 | ||
d400dcac AZ |
31 | #ifndef SIGACTION_FLAGS |
32 | # define SIGACTION_FLAGS 0 | |
33 | #endif | |
34 | ||
31d470ac JM |
35 | /* The backtrace should include at least handle_signal, a signal |
36 | trampoline, read, 3 * fn, and do_test. */ | |
37 | #define NUM_FUNCTIONS 7 | |
38 | ||
31d470ac JM |
39 | void |
40 | handle_signal (int signum) | |
41 | { | |
42 | void *addresses[NUM_FUNCTIONS]; | |
43 | char **symbols; | |
44 | int n; | |
45 | int i; | |
46 | ||
47 | /* Get the backtrace addresses. */ | |
48 | n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0])); | |
49 | printf ("Obtained backtrace with %d functions\n", n); | |
50 | /* Check that there are at least seven functions. */ | |
51 | if (n < NUM_FUNCTIONS) | |
52 | { | |
53 | FAIL (); | |
54 | return; | |
55 | } | |
56 | /* Convert them to symbols. */ | |
57 | symbols = backtrace_symbols (addresses, n); | |
58 | /* Check that symbols were obtained. */ | |
59 | if (symbols == NULL) | |
60 | { | |
61 | FAIL (); | |
62 | return; | |
63 | } | |
64 | for (i = 0; i < n; ++i) | |
65 | printf ("Function %d: %s\n", i, symbols[i]); | |
66 | /* Check that the function names obtained are accurate. */ | |
8c53a12c | 67 | if (!match (symbols[0], "handle_signal")) |
31d470ac JM |
68 | { |
69 | FAIL (); | |
70 | return; | |
71 | } | |
72 | /* Do not check name for signal trampoline. */ | |
73 | i = 2; | |
8c53a12c | 74 | if (!match (symbols[i++], "read")) |
31d470ac JM |
75 | { |
76 | /* Perhaps symbols[2] is __kernel_vsyscall? */ | |
8c53a12c | 77 | if (!match (symbols[i++], "read")) |
31d470ac JM |
78 | { |
79 | FAIL (); | |
80 | return; | |
81 | } | |
82 | } | |
83 | for (; i < n - 1; i++) | |
8c53a12c | 84 | if (!match (symbols[i], "fn")) |
31d470ac JM |
85 | { |
86 | FAIL (); | |
87 | return; | |
88 | } | |
89 | /* Symbol names are not available for static functions, so we do not | |
90 | check do_test. */ | |
0478174d AS |
91 | |
92 | /* Check that backtrace does not return more than what fits in the array | |
93 | (bug 25423). */ | |
94 | for (int j = 0; j < NUM_FUNCTIONS; j++) | |
95 | { | |
96 | n = backtrace (addresses, j); | |
97 | if (n > j) | |
98 | { | |
99 | FAIL (); | |
100 | return; | |
101 | } | |
102 | } | |
31d470ac JM |
103 | } |
104 | ||
105 | NO_INLINE int | |
d400dcac | 106 | fn (int c, int flags) |
31d470ac JM |
107 | { |
108 | pid_t parent_pid, child_pid; | |
109 | int pipefd[2]; | |
110 | char r[1]; | |
111 | struct sigaction act; | |
112 | ||
113 | if (c > 0) | |
114 | { | |
d400dcac | 115 | fn (c - 1, flags); |
31d470ac JM |
116 | return x; |
117 | } | |
118 | ||
119 | memset (&act, 0, sizeof (act)); | |
120 | act.sa_handler = handle_signal; | |
d400dcac | 121 | act.sa_flags = flags; |
31d470ac JM |
122 | sigemptyset (&act.sa_mask); |
123 | sigaction (SIGUSR1, &act, NULL); | |
124 | parent_pid = getpid (); | |
125 | if (pipe (pipefd) == -1) | |
126 | abort (); | |
127 | ||
128 | child_pid = fork (); | |
129 | if (child_pid == (pid_t) -1) | |
130 | abort (); | |
131 | else if (child_pid == 0) | |
132 | { | |
133 | sleep (1); | |
134 | kill (parent_pid, SIGUSR1); | |
135 | _exit (0); | |
136 | } | |
137 | ||
138 | /* In the parent. */ | |
139 | read (pipefd[0], r, 1); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
341657bc | 144 | NO_INLINE int |
31d470ac JM |
145 | do_test (void) |
146 | { | |
d400dcac | 147 | fn (2, SIGACTION_FLAGS); |
31d470ac JM |
148 | return ret; |
149 | } | |
341657bc FW |
150 | |
151 | #include <support/test-driver.c> |