/* For debugging general purposes */
#ifndef __PERF_DEBUG_H
#define __PERF_DEBUG_H

#include <stdbool.h>
#include <string.h>
#include "event.h"
#include "../ui/helpline.h"
#include "../ui/progress.h"
#include "../ui/util.h"

extern int verbose;
extern bool quiet, dump_trace;
extern int debug_ordered_events;
extern int debug_data_convert;

#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif

#define pr_err(fmt, ...) \
	eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warning(fmt, ...) \
	eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_info(fmt, ...) \
	eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug(fmt, ...) \
	eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debugN(n, fmt, ...) \
	eprintf(n, verbose, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug3(fmt, ...) pr_debugN(3, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug4(fmt, ...) pr_debugN(4, pr_fmt(fmt), ##__VA_ARGS__)

#define pr_time_N(n, var, t, fmt, ...) \
	eprintf_time(n, var, t, fmt, ##__VA_ARGS__)

#define pr_oe_time(t, fmt, ...)  pr_time_N(1, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_oe_time2(t, fmt, ...) pr_time_N(2, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)

#define STRERR_BUFSIZE	128	/* For the buffer size of str_error_r */

int dump_printf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
void trace_event(union perf_event *event);

int ui__error(const char *format, ...) __attribute__((format(printf, 1, 2)));
int ui__warning(const char *format, ...) __attribute__((format(printf, 1, 2)));

void pr_stat(const char *fmt, ...);

int eprintf(int level, int var, const char *fmt, ...) __attribute__((format(printf, 3, 4)));
int eprintf_time(int level, int var, u64 t, const char *fmt, ...) __attribute__((format(printf, 4, 5)));
int veprintf(int level, int var, const char *fmt, va_list args);

int perf_debug_option(const char *str);
void perf_debug_setup(void);

#endif	/* __PERF_DEBUG_H */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=152bff377653047c2a69c226435e2c3fd316b592&amp;showmsg=1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=152bff377653047c2a69c226435e2c3fd316b592&amp;showmsg=1'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/unix?id=152bff377653047c2a69c226435e2c3fd316b592&amp;showmsg=1'>unix</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/unix?id=152bff377653047c2a69c226435e2c3fd316b592'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr class='logheader'><td><span title='2017-02-02 21:58:02 -0500'>2017-02-02</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/unix?id=ba94f3088b792b16ea576a256a6030feddc87f24'>unix: add ioctl to open a unix socket file with O_PATH</a></td><td>Andrey Vagin</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+41</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
This ioctl opens a file to which a socket is bound and
returns a file descriptor. The caller has to have CAP_NET_ADMIN
in the socket network namespace.

Currently it is impossible to get a path and a mount point
for a socket file. socket_diag reports address, device ID and inode
number for unix sockets. An address can contain a relative path or
a file may be moved somewhere. And these properties say nothing about
a mount namespace and a mount point of a socket file.

With the introduced ioctl, we can get a path by reading
/proc/self/fd/X and get mnt_id from /proc/self/fdinfo/X.

In CRIU we are going to use this ioctl to dump and restore unix socket.

Here is an example how it can be used:

$ strace -e socket,bind,ioctl ./test /tmp/test_sock
socket(AF_UNIX, SOCK_STREAM, 0)         = 3
bind(3, {sa_family=AF_UNIX, sun_path="test_sock"}, 11) = 0
ioctl(3, SIOCUNIXFILE, 0)           = 4
^Z

$ ss -a | grep test_sock
u_str  LISTEN     0      1      test_sock 17798                 * 0

$ ls -l /proc/760/fd/{3,4}
lrwx------ 1 root root 64 Feb  1 09:41 3 -&gt; 'socket:[17798]'
l--------- 1 root root 64 Feb  1 09:41 4 -&gt; /tmp/test_sock

$ cat /proc/760/fdinfo/4
pos:	0
flags:	012000000
mnt_id:	40

$ cat /proc/self/mountinfo | grep "^40\s"
40 19 0:37 / /tmp rw shared:23 - tmpfs tmpfs rw

Signed-off-by: Andrei Vagin &lt;avagin@openvz.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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