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varnishcache
varnish-cache
Commits
b0a7454f
Commit
b0a7454f
authored
Jan 15, 2017
by
Poul-Henning Kamp
Browse files
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Plain Diff
Close a couple of races.
parent
eb34cf52
Changes
1
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Inline
Side-by-side
Showing
1 changed file
with
38 additions
and
17 deletions
+38
-17
vtc_process.c
bin/varnishtest/vtc_process.c
+38
-17
No files found.
bin/varnishtest/vtc_process.c
View file @
b0a7454f
...
...
@@ -62,8 +62,9 @@ struct process {
int
fd_from
;
pid_t
pid
;
pthread_mutex_t
mtx
;
pthread_t
tp
;
unsigned
running
;
unsigned
hasthread
;
int
status
;
};
...
...
@@ -95,6 +96,7 @@ process_new(const char *name)
ALLOC_OBJ
(
p
,
PROCESS_MAGIC
);
AN
(
p
);
REPLACE
(
p
->
name
,
name
);
AZ
(
pthread_mutex_init
(
&
p
->
mtx
,
NULL
));
p
->
vl
=
vtc_logopen
(
name
);
AN
(
p
->
vl
);
...
...
@@ -129,6 +131,7 @@ process_delete(struct process *p)
{
CHECK_OBJ_NOTNULL
(
p
,
PROCESS_MAGIC
);
AZ
(
pthread_mutex_destroy
(
&
p
->
mtx
));
vtc_logclose
(
p
->
vl
);
free
(
p
->
name
);
free
(
p
->
workdir
);
...
...
@@ -174,14 +177,22 @@ process_thread(void *priv)
continue
;
}
r
=
wait4
(
p
->
pid
,
&
p
->
status
,
0
,
&
ru
);
closefd
(
&
p
->
fd_to
);
AZ
(
pthread_mutex_lock
(
&
p
->
mtx
));
macro_undef
(
p
->
vl
,
p
->
name
,
"pid"
);
p
->
pid
=
-
1
;
p
->
running
=
0
;
vtc_log
(
p
->
vl
,
2
,
"R %d Status: %04x (u %.6f s %.6f)"
,
r
,
p
->
status
,
vtc_log
(
p
->
vl
,
2
,
"R 0x%04x Status: %04x (u %.6f s %.6f)"
,
r
,
p
->
status
,
ru
.
ru_utime
.
tv_sec
+
1e-6
*
ru
.
ru_utime
.
tv_usec
,
ru
.
ru_stime
.
tv_sec
+
1e-6
*
ru
.
ru_stime
.
tv_usec
);
AZ
(
pthread_mutex_unlock
(
&
p
->
mtx
));
if
(
WIFEXITED
(
p
->
status
)
&&
WEXITSTATUS
(
p
->
status
)
==
0
)
return
(
NULL
);
#ifdef WCOREDUMP
...
...
@@ -193,8 +204,6 @@ process_thread(void *priv)
p
->
status
,
WTERMSIG
(
p
->
status
),
WEXITSTATUS
(
p
->
status
));
#endif
closefd
(
&
p
->
fd_to
);
return
(
NULL
);
}
...
...
@@ -207,6 +216,8 @@ process_start(struct process *p)
int
fdt
[
2
];
CHECK_OBJ_NOTNULL
(
p
,
PROCESS_MAGIC
);
if
(
p
->
hasthread
)
vtc_log
(
p
->
vl
,
0
,
"Already running, (-wait first)"
);
vtc_log
(
p
->
vl
,
4
,
"CMD: %s"
,
p
->
spec
);
...
...
@@ -227,7 +238,6 @@ process_start(struct process *p)
}
p
->
pid
=
fork
();
assert
(
p
->
pid
>=
0
);
p
->
running
=
1
;
if
(
p
->
pid
==
0
)
{
assert
(
dup2
(
fds
[
0
],
0
)
==
0
);
assert
(
dup2
(
out_fd
,
1
)
==
1
);
...
...
@@ -249,6 +259,7 @@ process_start(struct process *p)
closefd
(
&
err_fd
);
}
VSB_destroy
(
&
cl
);
p
->
hasthread
=
1
;
AZ
(
pthread_create
(
&
p
->
tp
,
NULL
,
process_thread
,
p
));
}
...
...
@@ -257,12 +268,14 @@ process_start(struct process *p)
*/
static
void
process_wait
(
const
struct
process
*
p
)
process_wait
(
struct
process
*
p
)
{
void
*
v
;
if
(
p
->
running
&&
p
->
pid
>
0
)
if
(
p
->
hasthread
)
{
AZ
(
pthread_join
(
p
->
tp
,
&
v
));
p
->
hasthread
=
0
;
}
}
static
void
...
...
@@ -278,14 +291,19 @@ process_run(struct process *p)
*/
static
void
process_kill
(
const
struct
process
*
p
,
const
char
*
sig
)
process_kill
(
struct
process
*
p
,
const
char
*
sig
)
{
int
j
=
0
;
pid_t
pid
;
CHECK_OBJ_NOTNULL
(
p
,
PROCESS_MAGIC
);
AN
(
sig
);
if
(
!
p
->
running
||
p
->
pid
<=
0
)
AZ
(
pthread_mutex_lock
(
&
p
->
mtx
));
pid
=
p
->
pid
;
AZ
(
pthread_mutex_unlock
(
&
p
->
mtx
));
if
(
pid
<=
0
)
vtc_log
(
p
->
vl
,
0
,
"Cannot signal a non-running process"
);
if
(
!
strcmp
(
sig
,
"TERM"
))
...
...
@@ -299,19 +317,20 @@ process_kill(const struct process *p, const char *sig)
else
vtc_log
(
p
->
vl
,
0
,
"Could not grok signal (%s)"
,
sig
);
if
(
kill
(
-
p
->
pid
,
j
)
<
0
)
vtc_log
(
p
->
vl
,
0
,
"Failed to send signal %d (%s)"
,
j
,
strerror
(
errno
));
if
(
kill
(
-
pid
,
j
)
<
0
)
vtc_log
(
p
->
vl
,
0
,
"Failed to send signal %d (%s)"
,
j
,
strerror
(
errno
));
else
vtc_log
(
p
->
vl
,
4
,
"Sent signal %d"
,
j
);
}
static
inline
void
process_terminate
(
const
struct
process
*
p
)
process_terminate
(
struct
process
*
p
)
{
process_kill
(
p
,
"TERM"
);
sleep
(
1
);
if
(
p
->
running
&&
p
->
pid
>
0
)
if
(
p
->
pid
>
0
)
process_kill
(
p
,
"KILL"
);
}
...
...
@@ -324,7 +343,7 @@ process_write(const struct process *p, const char *text)
{
int
r
,
len
;
if
(
!
p
->
running
||
p
->
pid
<=
0
)
if
(
!
p
->
hasthread
)
vtc_log
(
p
->
vl
,
0
,
"Cannot write to a non-running process"
);
len
=
strlen
(
text
);
...
...
@@ -339,7 +358,7 @@ static void
process_close
(
struct
process
*
p
)
{
if
(
!
p
->
running
||
p
->
pid
<=
0
)
if
(
!
p
->
hasthread
)
vtc_log
(
p
->
vl
,
0
,
"Cannot close on a non-running process"
);
closefd
(
&
p
->
fd_to
);
...
...
@@ -403,8 +422,10 @@ cmd_process(CMD_ARGS)
if
(
av
==
NULL
)
{
/* Reset and free */
VTAILQ_FOREACH_SAFE
(
p
,
&
processes
,
list
,
p2
)
{
if
(
p
->
running
&&
p
->
pid
>
0
)
if
(
p
->
pid
>
0
)
process_terminate
(
p
);
if
(
p
->
hasthread
)
process_wait
(
p
);
VTAILQ_REMOVE
(
&
processes
,
p
,
list
);
process_delete
(
p
);
}
...
...
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