1 /* Test dwfl_linux_proc_attach works without any modules.
2 Copyright (C) 2015 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 elfutils is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19 #include <inttypes.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <errno.h>
23 #include <unistd.h>
24 #ifdef __linux__
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <sys/user.h>
28 #include <fcntl.h>
29 #include <string.h>
30 #include ELFUTILS_HEADER(dwfl)
31 #include <pthread.h>
32 #endif
33 #include "system.h"
34
35 #ifndef __linux__
36 int
main(int argc,char ** argv)37 main (int argc __attribute__ ((unused)), char **argv __attribute__ ((unused)))
38 {
39 printf ("dwfl_linux_proc_attach unsupported.\n");
40 return 77;
41 }
42 #else /* __linux__ */
43
44 static pthread_t thread1;
45 static pthread_t thread2;
46
47 static void *
sleeper(void * d)48 sleeper (void* d __attribute__ ((unused)))
49 {
50 sleep (60);
51 return NULL;
52 }
53
54 static char *debuginfo_path = NULL;
55
56 static const Dwfl_Callbacks proc_callbacks =
57 {
58 .find_elf = dwfl_linux_proc_find_elf,
59 .find_debuginfo = dwfl_standard_find_debuginfo,
60 .debuginfo_path = &debuginfo_path,
61 };
62
63 static int
thread_callback(Dwfl_Thread * thread,void * thread_arg)64 thread_callback (Dwfl_Thread *thread, void *thread_arg)
65 {
66 int *threads = (int *) thread_arg;
67 pid_t tid = dwfl_thread_tid (thread);
68 printf ("thread tid: %d\n", tid);
69 (*threads)++;
70
71 return DWARF_CB_OK;
72 }
73
74 int
main(int argc,char ** argv)75 main (int argc __attribute__ ((unused)),
76 char **argv __attribute__ ((unused)))
77 {
78 /* Create two extra threads to iterate through. */
79 int err;
80 if ((err = pthread_create (&thread1, NULL, sleeper, NULL)) != 0)
81 error (-1, err, "Couldn't create thread1");
82 if ((err = pthread_create (&thread2, NULL, sleeper, NULL)) != 0)
83 error (-1, err, "Couldn't create thread2");
84
85 Dwfl *dwfl = dwfl_begin (&proc_callbacks);
86 if (dwfl == NULL)
87 error (-1, 0, "dwfl_begin: %s", dwfl_errmsg (-1));
88
89 pid_t pid = getpid ();
90 /* This used to fail, since we don't have any modules yet. */
91 if (dwfl_linux_proc_attach (dwfl, pid, false) < 0)
92 error (-1, 0, "dwfl_linux_proc_attach pid %d: %s", pid,
93 dwfl_errmsg (-1));
94
95 /* Did we see all 3 threads? */
96 int threads = 0;
97 if (dwfl_getthreads (dwfl, thread_callback, &threads) != DWARF_CB_OK)
98 error (-1, 0, "dwfl_getthreads failed: %s", dwfl_errmsg (-1));
99
100 return (threads == 3) ? 0 : -1;
101 }
102
103 #endif /* __linux__ */
104