Last change
on this file was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1003 bytes
|
Line | |
---|
1 | /* Copyright 2002, Red Hat Inc. */ |
---|
2 | |
---|
3 | #include <mqueue.h> |
---|
4 | #include <errno.h> |
---|
5 | #include <sys/sem.h> |
---|
6 | #include <string.h> |
---|
7 | #define _LIBC 1 |
---|
8 | #include <sys/lock.h> |
---|
9 | #undef _LIBC |
---|
10 | |
---|
11 | #include "mqlocal.h" |
---|
12 | |
---|
13 | int |
---|
14 | mq_setattr (mqd_t msgid, const struct mq_attr *mqstat, struct mq_attr *omqstat) |
---|
15 | { |
---|
16 | struct libc_mq *info; |
---|
17 | struct sembuf sb0 = {0, -1, 0}; |
---|
18 | int num_msgs; |
---|
19 | int rc = 0; |
---|
20 | |
---|
21 | info = __find_mq (msgid); |
---|
22 | |
---|
23 | if (info == NULL) |
---|
24 | { |
---|
25 | errno = EBADF; |
---|
26 | return -1; |
---|
27 | } |
---|
28 | |
---|
29 | /* temporarily lock message queue */ |
---|
30 | semop (info->semid, &sb0, 1); |
---|
31 | |
---|
32 | /* make copy of old structure */ |
---|
33 | if (omqstat != NULL) |
---|
34 | { |
---|
35 | num_msgs = semctl (info->semid, 3, GETVAL); |
---|
36 | if (num_msgs >= 0) |
---|
37 | { |
---|
38 | memcpy (omqstat, info->attr, sizeof(struct mq_attr)); |
---|
39 | omqstat->mq_curmsgs = num_msgs; |
---|
40 | } |
---|
41 | else |
---|
42 | rc = -1; |
---|
43 | } |
---|
44 | |
---|
45 | /* only the mq_flags field can be changed */ |
---|
46 | info->attr->mq_flags = mqstat->mq_flags; |
---|
47 | |
---|
48 | /* release message queue */ |
---|
49 | sb0.sem_op = 1; |
---|
50 | semop (info->semid, &sb0, 1); |
---|
51 | |
---|
52 | return rc; |
---|
53 | } |
---|
54 | |
---|
55 | |
---|
56 | |
---|
57 | |
---|
58 | |
---|
59 | |
---|
Note: See
TracBrowser
for help on using the repository browser.