2 * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License as published by the
6 * Free Software Foundation; version 2.1 of the License.
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include <sys/types.h>
31 #include <common/compat/tid.h>
33 #include "signal-helper.h"
36 #define TRACEPOINT_DEFINE
39 #define LTTNG_PROC_NS_PATH_MAX 40
41 static int nr_iter
= 100;
43 static char *ns_opt
= NULL
;
44 static char *after_unshare_file_path
= NULL
;
45 static char *before_second_event_file_path
= NULL
;
48 struct poptOption opts
[] = {
49 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
50 { "debug", 'd', POPT_ARG_NONE
, &debug
, 0, "Enable debug output", NULL
},
51 { "ns", 'n', POPT_ARG_STRING
, &ns_opt
, 0, "Namespace short identifier", NULL
},
52 { "iter", 'i', POPT_ARG_INT
, &nr_iter
, 0, "Number of tracepoint iterations", NULL
},
53 { "after", 'a', POPT_ARG_STRING
, &after_unshare_file_path
, 0, "after_unshare_file_path,", NULL
},
54 { "before", 'b', POPT_ARG_STRING
, &before_second_event_file_path
, 0, "before_second_event_file_path,", NULL
},
56 { NULL
, 0, 0, NULL
, 0 }
59 static void debug_printf(const char *format
, ...)
62 va_start(args
, format
);
65 vfprintf(stderr
, format
, args
);
71 static int get_ns_inum(const char *ns
, ino_t
*ns_inum
)
75 char proc_ns_path
[LTTNG_PROC_NS_PATH_MAX
];
78 * /proc/thread-self was introduced in kernel v3.17
80 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
81 "/proc/thread-self/ns/%s", ns
) >= 0) {
82 if (stat(proc_ns_path
, &sb
) == 0) {
90 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
91 "/proc/self/task/%d/%s/net", lttng_gettid(), ns
) >= 0) {
92 if (stat(proc_ns_path
, &sb
) == 0) {
103 static int do_the_needful(int ns_flag
, const char *ns_str
)
108 ret
= get_ns_inum(ns_str
, &ns1
);
110 debug_printf("Failed to get ns inode number for namespace %s",
115 debug_printf("Initial %s ns inode number: %lu\n", ns_str
, ns1
);
117 for (i
= 0; nr_iter
< 0 || i
< nr_iter
; i
++) {
118 tracepoint(tp
, tptest
, ns1
);
124 ret
= unshare(ns_flag
);
126 perror("Failed to unshare namespace");
130 ret
= get_ns_inum(ns_str
, &ns2
);
132 debug_printf("Failed to get ns inode number for namespace %s",
137 debug_printf("Post unshare %s ns inode number: %lu\n", ns_str
, ns2
);
140 * Signal that we emited the first event group and that the
141 * unshare call is completed.
143 if (after_unshare_file_path
) {
144 ret
= create_file(after_unshare_file_path
);
150 /* Wait on synchronization before writing second event group. */
151 if (before_second_event_file_path
) {
152 ret
= wait_on_file(before_second_event_file_path
);
158 for (i
= 0; nr_iter
< 0 || i
< nr_iter
; i
++) {
159 tracepoint(tp
, tptest
, ns2
);
170 * Send X events, change NS, wait for file to sync with test script, send X
173 int main(int argc
, const char **argv
)
176 int ret
= EXIT_SUCCESS
;
179 pc
= poptGetContext(NULL
, argc
, argv
, opts
, 0);
180 poptReadDefaultConfig(pc
, 0);
183 poptPrintHelp(pc
, stderr
, 0);
188 while ((opt
= poptGetNextOpt(pc
)) >= 0) {
191 poptPrintUsage(pc
, stderr
, 0);
198 /* An error occurred during option processing. */
199 poptPrintUsage(pc
, stderr
, 0);
200 fprintf(stderr
, "%s: %s\n",
201 poptBadOption(pc
, POPT_BADOPTION_NOALIAS
),
207 if (ns_opt
== NULL
) {
208 poptPrintUsage(pc
, stderr
, 0);
213 if (set_signal_handler()) {
218 if (strncmp(ns_opt
, "cgroup", 3) == 0) {
219 ret
= do_the_needful(CLONE_NEWCGROUP
, "cgroup");
220 } else if (strncmp(ns_opt
, "ipc", 3) == 0) {
221 ret
= do_the_needful(CLONE_NEWIPC
, "ipc");
222 } else if (strncmp(ns_opt
, "mnt", 3) == 0) {
223 ret
= do_the_needful(CLONE_NEWNS
, "mnt");
224 } else if (strncmp(ns_opt
, "net", 3) == 0) {
225 ret
= do_the_needful(CLONE_NEWNET
, "net");
226 } else if (strncmp(ns_opt
, "pid", 3) == 0) {
227 ret
= do_the_needful(CLONE_NEWPID
, "pid");
228 } else if (strncmp(ns_opt
, "user", 3) == 0) {
230 * Will always fail, requires a single threaded application,
231 * which can't happen with UST.
233 ret
= do_the_needful(CLONE_NEWUSER
, "user");
234 } else if (strncmp(ns_opt
, "uts", 3) == 0) {
235 ret
= do_the_needful(CLONE_NEWUTS
, "uts");
237 printf("invalid ns id\n");
241 ret
= ret
? EXIT_FAILURE
: EXIT_SUCCESS
;