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plibsys/src/pipc.c at master · brightprogrammer/plibsys · GitHub
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/*
* The MIT License
*
* Copyright (C) 2010-2017 Alexander Saprykin <saprykin.spb@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* 'Software'), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include
"pmem.h"
#include
"pcryptohash.h"
#include
"pstring.h"
#include
"psysclose-private.h"
#include
<stdlib.h>
#include
<string.h>
#if
!defined (
P_OS_WIN
)
&&
!defined (
P_OS_OS2
)
&&
!defined (
P_OS_AMIGA
)
# include
<unistd.h>
# include
<errno.h>
# include
<fcntl.h>
# include
<sys/stat.h>
# include
<sys/types.h>
# include
<sys/ipc.h>
#endif
#if
!defined (
P_OS_WIN
)
&&
!defined (
P_OS_OS2
)
&&
!defined (
P_OS_AMIGA
)
pchar
*
p_ipc_unix_get_temp_dir
(
void
)
{
pchar
*
str
,
*
ret
;
psize
len
;
#ifdef
P_tmpdir
if
(
strlen
(
P_tmpdir
)
>
0
)
str
=
p_strdup
(
P_tmpdir
);
else
return
p_strdup
(
"/tmp/"
);
#else
const
pchar
*
tmp_env
;
tmp_env
=
getenv
(
"TMPDIR"
);
if
(
tmp_env
!=
NULL
)
str
=
p_strdup
(
tmp_env
);
else
return
p_strdup
(
"/tmp/"
);
#endif
/* P_tmpdir */
/* Now we need to ensure that we have only the one trailing slash */
len
=
strlen
(
str
);
while
(
*
(
str
+
--
len
)
==
'/'
)
;
*
(
str
+
++
len
)
=
'\0'
;
/* len + / + zero symbol */
if
(
P_UNLIKELY
((
ret
=
p_malloc0
(
len
+
2
))
==
NULL
)) {
p_free
(
str
);
return
NULL
;
}
strcpy
(
ret
,
str
);
strcat
(
ret
,
"/"
);
return
ret
;
}
/* Create file for System V IPC, if needed
* Returns: -1 = error, 0 = file successfully created, 1 = file already exists */
pint
p_ipc_unix_create_key_file
(
const
pchar
*
file_name
)
{
pint
fd
;
if
(
P_UNLIKELY
(
file_name
==
NULL
))
return
-1
;
if
((
fd
=
open
(
file_name
,
O_CREAT
|
O_EXCL
|
O_RDONLY
,
0640
))
==
-1
)
/* file already exists */
return
(
errno
==
EEXIST
) ?
1
:
-1
;
else
return
p_sys_close
(
fd
);
}
pint
p_ipc_unix_get_ftok_key
(
const
pchar
*
file_name
)
{
struct
stat
st_info
;
if
(
P_UNLIKELY
(
file_name
==
NULL
))
return
-1
;
if
(
P_UNLIKELY
(
stat
(
file_name
,
&
st_info
)
==
-1
))
return
-1
;
return
ftok
(
file_name
,
'P'
);
}
#endif
/* !P_OS_WIN && !P_OS_OS2 && !P_OS_AMIGA */
/* Returns a platform-independent key for IPC usage, object name for Windows and
* a file name to use with ftok () for UNIX-like systems */
pchar
*
p_ipc_get_platform_key
(
const
pchar
*
name
,
pboolean
posix
)
{
PCryptoHash
*
sha1
;
pchar
*
hash_str
;
#if
defined (
P_OS_WIN
)
||
defined (
P_OS_OS2
)
||
defined (
P_OS_AMIGA
)
P_UNUSED
(
posix
);
#else
pchar
*
path_name
,
*
tmp_path
;
#endif
if
(
P_UNLIKELY
(
name
==
NULL
))
return
NULL
;
if
(
P_UNLIKELY
((
sha1
=
p_crypto_hash_new
(
P_CRYPTO_HASH_TYPE_SHA1
))
==
NULL
))
return
NULL
;
p_crypto_hash_update
(
sha1
, (
const
puchar
*
)
name
,
strlen
(
name
));
hash_str
=
p_crypto_hash_get_string
(
sha1
);
p_crypto_hash_free
(
sha1
);
if
(
P_UNLIKELY
(
hash_str
==
NULL
))
return
NULL
;
#if
defined (
P_OS_WIN
)
||
defined (
P_OS_OS2
)
||
defined (
P_OS_AMIGA
)
return
hash_str
;
#else
if
(
posix
) {
/* POSIX semaphores which are named kinda like '/semname'.
* Some implementations of POSIX semaphores has restriction for
* the name as of max 14 characters, best to use this limit */
if
(
P_UNLIKELY
((
path_name
=
p_malloc0
(
15
))
==
NULL
)) {
p_free
(
hash_str
);
return
NULL
;
}
strcpy
(
path_name
,
"/"
);
strncat
(
path_name
,
hash_str
,
13
);
}
else
{
tmp_path
=
p_ipc_unix_get_temp_dir
();
/* tmp dir + filename + zero symbol */
path_name
=
p_malloc0
(
strlen
(
tmp_path
)
+
strlen
(
hash_str
)
+
1
);
if
(
P_UNLIKELY
((
path_name
)
==
NULL
)) {
p_free
(
tmp_path
);
p_free
(
hash_str
);
return
NULL
;
}
strcpy
(
path_name
,
tmp_path
);
strcat
(
path_name
,
hash_str
);
p_free
(
tmp_path
);
}
p_free
(
hash_str
);
return
path_name
;
#endif
}
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