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9cb6e6ea
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Third Party Musl
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9cb6e6ea
编写于
3月 24, 2013
作者:
R
Rich Felker
浏览文件
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浏览文件
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电子邮件补丁
差异文件
rewrite popen to use posix_spawn instead of fragile vfork hacks
上级
7914ce92
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
41 addition
and
41 deletion
+41
-41
src/stdio/popen.c
src/stdio/popen.c
+41
-41
未找到文件。
src/stdio/popen.c
浏览文件 @
9cb6e6ea
...
...
@@ -2,28 +2,23 @@
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <spawn.h>
#include "stdio_impl.h"
#include "pthread_impl.h"
#include "syscall.h"
static
void
dummy_0
()
{
}
weak_alias
(
dummy_0
,
__acquire_ptc
);
weak_alias
(
dummy_0
,
__release_ptc
);
pid_t
__vfork
(
void
);
extern
char
**
__environ
;
FILE
*
popen
(
const
char
*
cmd
,
const
char
*
mode
)
{
int
p
[
2
],
op
,
i
;
int
p
[
2
],
op
,
e
;
pid_t
pid
;
FILE
*
f
;
sigset_t
old
;
const
char
*
modes
=
"rw"
,
*
mi
=
strchr
(
modes
,
*
mode
);
posix_spawn_file_actions_t
fa
;
if
(
mi
)
{
op
=
mi
-
modes
;
if
(
*
mode
==
'r'
)
{
op
=
0
;
}
else
if
(
*
mode
==
'w'
)
{
op
=
1
;
}
else
{
errno
=
EINVAL
;
return
0
;
...
...
@@ -36,38 +31,43 @@ FILE *popen(const char *cmd, const char *mode)
__syscall
(
SYS_close
,
p
[
1
]);
return
NULL
;
}
FLOCK
(
f
);
sigprocmask
(
SIG_BLOCK
,
SIGALL_SET
,
&
old
);
__acquire_ptc
();
pid
=
__vfork
();
if
(
pid
)
{
__release_ptc
();
__syscall
(
SYS_close
,
p
[
1
-
op
]);
sigprocmask
(
SIG_SETMASK
,
&
old
,
0
);
if
(
pid
<
0
)
{
fclose
(
f
);
return
0
;
/* If the child's end of the pipe happens to already be on the final
* fd number to which it will be assigned (either 0 or 1), it must
* be moved to a different fd. Otherwise, there is no safe way to
* remove the close-on-exec flag in the child without also creating
* a file descriptor leak race condition in the parent. */
if
(
p
[
1
-
op
]
==
1
-
op
)
{
int
tmp
=
fcntl
(
F_DUPFD_CLOEXEC
,
1
-
op
,
0
);
if
(
tmp
<
0
)
{
e
=
errno
;
goto
fail
;
}
f
->
pipe_pid
=
pid
;
return
f
;
__syscall
(
SYS_close
,
p
[
1
-
op
])
;
p
[
1
-
op
]
=
tmp
;
}
/* See notes in system.c for why this is needed. */
for
(
i
=
1
;
i
<=
8
*
__SYSCALL_SSLEN
;
i
++
)
{
struct
sigaction
sa
;
__libc_sigaction
(
i
,
0
,
&
sa
);
if
(
sa
.
sa_handler
!=
SIG_IGN
&&
sa
.
sa_handler
!=
SIG_DFL
)
{
sa
.
sa_handler
=
SIG_DFL
;
__libc_sigaction
(
i
,
&
sa
,
0
);
e
=
ENOMEM
;
if
(
!
posix_spawn_file_actions_init
(
&
fa
))
{
if
(
!
posix_spawn_file_actions_adddup2
(
&
fa
,
p
[
1
-
op
],
1
-
op
))
{
if
(
!
(
e
=
posix_spawn
(
&
pid
,
"/bin/sh"
,
&
fa
,
0
,
(
char
*
[]){
"sh"
,
"-c"
,
(
char
*
)
cmd
,
0
},
__environ
)))
{
posix_spawn_file_actions_destroy
(
&
fa
);
f
->
pipe_pid
=
pid
;
if
(
!
strchr
(
mode
,
'e'
))
fcntl
(
p
[
op
],
F_SETFD
,
0
);
__syscall
(
SYS_close
,
p
[
1
-
op
]);
FUNLOCK
(
f
);
return
f
;
}
}
posix_spawn_file_actions_destroy
(
&
fa
);
}
if
(
dup2
(
p
[
1
-
op
],
1
-
op
)
<
0
)
_exit
(
127
);
fcntl
(
1
-
op
,
F_SETFD
,
0
);
if
(
p
[
0
]
!=
1
-
op
)
__syscall
(
SYS_close
,
p
[
0
]);
if
(
p
[
1
]
!=
1
-
op
)
__syscall
(
SYS_close
,
p
[
1
]);
sigprocmask
(
SIG_SETMASK
,
&
old
,
0
);
execl
(
"/bin/sh"
,
"sh"
,
"-c"
,
cmd
,
(
char
*
)
0
);
_exit
(
127
);
fail:
fclose
(
f
);
__syscall
(
SYS_close
,
p
[
1
-
op
]);
errno
=
e
;
return
0
;
}
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