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Kirill Smelkov
bcc
Commits
97562956
Commit
97562956
authored
Sep 18, 2017
by
Teng Qin
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Add common helper to read Process executable
parent
899d3e92
Changes
3
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3 changed files
with
20 additions
and
10 deletions
+20
-10
src/cc/common.cc
src/cc/common.cc
+13
-0
src/cc/common.h
src/cc/common.h
+4
-0
src/cc/usdt/usdt.cc
src/cc/usdt/usdt.cc
+3
-10
No files found.
src/cc/common.cc
View file @
97562956
...
...
@@ -17,6 +17,7 @@
#include <sstream>
#include "common.h"
#include "vendor/tinyformat.hpp"
namespace
ebpf
{
...
...
@@ -48,4 +49,16 @@ std::vector<int> get_possible_cpus() {
return
read_cpu_range
(
"/sys/devices/system/cpu/possible"
);
}
std
::
string
get_pid_exe
(
pid_t
pid
)
{
char
exe_path
[
4096
];
int
res
;
std
::
string
exe_link
=
tfm
::
format
(
"/proc/%d/exe"
,
pid
);
res
=
readlink
(
exe_link
.
c_str
(),
exe_path
,
sizeof
(
exe_path
));
if
(
res
==
-
1
)
return
""
;
exe_path
[
res
]
=
'\0'
;
return
std
::
string
(
exe_path
);
}
}
// namespace ebpf
src/cc/common.h
View file @
97562956
...
...
@@ -17,6 +17,8 @@
#pragma once
#include <memory>
#include <string>
#include <unistd.h>
#include <vector>
namespace
ebpf
{
...
...
@@ -31,4 +33,6 @@ std::vector<int> get_online_cpus();
std
::
vector
<
int
>
get_possible_cpus
();
std
::
string
get_pid_exe
(
pid_t
pid
);
}
// namespace ebpf
src/cc/usdt/usdt.cc
View file @
97562956
...
...
@@ -24,6 +24,7 @@
#include "bcc_elf.h"
#include "bcc_proc.h"
#include "common.h"
#include "usdt.h"
#include "vendor/tinyformat.hpp"
#include "bcc_usdt.h"
...
...
@@ -314,17 +315,9 @@ Context::Context(const std::string &bin_path)
Context
::
Context
(
int
pid
)
:
pid_
(
pid
),
pid_stat_
(
pid
),
mount_ns_instance_
(
new
ProcMountNS
(
pid
)),
loaded_
(
false
)
{
if
(
bcc_procutils_each_module
(
pid
,
_each_module
,
this
)
==
0
)
{
// get exe command from /proc/<pid>/exe
// assume the maximum path length 4096, which should be
// sufficiently large to cover all use cases
char
source
[
64
];
char
cmd_buf
[
4096
];
snprintf
(
source
,
sizeof
(
source
),
"/proc/%d/exe"
,
pid
);
ssize_t
cmd_len
=
readlink
(
source
,
cmd_buf
,
sizeof
(
cmd_buf
)
-
1
);
if
(
cmd_len
==
-
1
)
cmd_bin_path_
=
ebpf
::
get_pid_exe
(
pid
);
if
(
cmd_bin_path_
.
empty
())
return
;
cmd_buf
[
cmd_len
]
=
'\0'
;
cmd_bin_path_
.
assign
(
cmd_buf
,
cmd_len
+
1
);
loaded_
=
true
;
}
...
...
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