1 /* Test backtrace and backtrace_symbols for signal frames, where a
2 system call was interrupted by a signal.
3 Copyright (C) 2011-2024 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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.
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.
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 <https://www.gnu.org/licenses/>. */
25 #include <sys/types.h>
29 #include "tst-backtrace.h"
31 #ifndef SIGACTION_FLAGS
32 # define SIGACTION_FLAGS 0
35 /* The backtrace should include at least handle_signal, a signal
36 trampoline, read, 3 * fn, and do_test. */
37 #define NUM_FUNCTIONS 7
40 handle_signal (int signum)
42 void *addresses[NUM_FUNCTIONS];
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)
56 /* Convert them to symbols. */
57 symbols = backtrace_symbols (addresses, n);
58 /* Check that symbols were obtained. */
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. */
67 if (!match (symbols[0], "handle_signal"))
73 /* Do not check name for signal trampoline or cancellable syscall
74 wrappers (__syscall_cancel*). */
75 for (; i < n - 1; i++)
76 if (match (symbols[i], "read"))
84 for (; i < n - 1; i++)
85 if (!match (symbols[i], "fn"))
90 /* Symbol names are not available for static functions, so we do not
93 /* Check that backtrace does not return more than what fits in the array
95 for (int j = 0; j < NUM_FUNCTIONS; j++)
97 n = backtrace (addresses, j);
107 fn (int c, int flags)
109 pid_t parent_pid, child_pid;
112 struct sigaction act;
120 memset (&act, 0, sizeof (act));
121 act.sa_handler = handle_signal;
122 act.sa_flags = flags;
123 sigemptyset (&act.sa_mask);
124 sigaction (SIGUSR1, &act, NULL);
125 parent_pid = getpid ();
126 if (pipe (pipefd) == -1)
130 if (child_pid == (pid_t) -1)
132 else if (child_pid == 0)
135 kill (parent_pid, SIGUSR1);
140 read (pipefd[0], r, 1);
148 fn (2, SIGACTION_FLAGS);
152 #include <support/test-driver.c>