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sysv_msg.c (194832) sysv_msg.c (194894)
1/*-
2 * Implementation of SVID messages
3 *
4 * Author: Daniel Boulet
5 *
6 * Copyright 1993 Daniel Boulet and RTMX Inc.
7 *
8 * This system call was implemented by Daniel Boulet under contract from RTMX.

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43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * SUCH DAMAGE.
48 */
49
50#include <sys/cdefs.h>
1/*-
2 * Implementation of SVID messages
3 *
4 * Author: Daniel Boulet
5 *
6 * Copyright 1993 Daniel Boulet and RTMX Inc.
7 *
8 * This system call was implemented by Daniel Boulet under contract from RTMX.

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43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * SUCH DAMAGE.
48 */
49
50#include <sys/cdefs.h>
51__FBSDID("$FreeBSD: head/sys/kern/sysv_msg.c 194832 2009-06-24 13:35:38Z jhb $");
51__FBSDID("$FreeBSD: head/sys/kern/sysv_msg.c 194894 2009-06-24 20:01:13Z jhb $");
52
52
53#include "opt_compat.h"
53#include "opt_sysvipc.h"
54
55#include <sys/param.h>
56#include <sys/systm.h>
57#include <sys/sysproto.h>
58#include <sys/kernel.h>
59#include <sys/priv.h>
60#include <sys/proc.h>

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80#ifdef MSG_DEBUG
81#define DPRINTF(a) printf a
82#else
83#define DPRINTF(a) (void)0
84#endif
85
86static void msg_freehdr(struct msg *msghdr);
87
54#include "opt_sysvipc.h"
55
56#include <sys/param.h>
57#include <sys/systm.h>
58#include <sys/sysproto.h>
59#include <sys/kernel.h>
60#include <sys/priv.h>
61#include <sys/proc.h>

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81#ifdef MSG_DEBUG
82#define DPRINTF(a) printf a
83#else
84#define DPRINTF(a) (void)0
85#endif
86
87static void msg_freehdr(struct msg *msghdr);
88
88/* XXX casting to (sy_call_t *) is bogus, as usual. */
89static sy_call_t *msgcalls[] = {
90 (sy_call_t *)msgctl, (sy_call_t *)msgget,
91 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv
92};
93
94#ifndef MSGSSZ
95#define MSGSSZ 8 /* Each segment must be 2^N long */
96#endif
97#ifndef MSGSEG
98#define MSGSEG 2048 /* must be less than 32767 */
99#endif
100#define MSGMAX (MSGSSZ*MSGSEG)
101#ifndef MSGMNB

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303}
304
305static moduledata_t sysvmsg_mod = {
306 "sysvmsg",
307 &sysvmsg_modload,
308 NULL
309};
310
89#ifndef MSGSSZ
90#define MSGSSZ 8 /* Each segment must be 2^N long */
91#endif
92#ifndef MSGSEG
93#define MSGSEG 2048 /* must be less than 32767 */
94#endif
95#define MSGMAX (MSGSSZ*MSGSEG)
96#ifndef MSGMNB

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298}
299
300static moduledata_t sysvmsg_mod = {
301 "sysvmsg",
302 &sysvmsg_modload,
303 NULL
304};
305
311SYSCALL_MODULE_HELPER(msgsys);
312SYSCALL_MODULE_HELPER(msgctl);
313SYSCALL_MODULE_HELPER(msgget);
314SYSCALL_MODULE_HELPER(msgsnd);
315SYSCALL_MODULE_HELPER(msgrcv);
316
317DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
318MODULE_VERSION(sysvmsg, 1);
319
306SYSCALL_MODULE_HELPER(msgctl);
307SYSCALL_MODULE_HELPER(msgget);
308SYSCALL_MODULE_HELPER(msgsnd);
309SYSCALL_MODULE_HELPER(msgrcv);
310
311DECLARE_MODULE(sysvmsg, sysvmsg_mod, SI_SUB_SYSV_MSG, SI_ORDER_FIRST);
312MODULE_VERSION(sysvmsg, 1);
313
320/*
321 * Entry point for all MSG calls.
322 */
323int
324msgsys(td, uap)
325 struct thread *td;
326 /* XXX actually varargs. */
327 struct msgsys_args /* {
328 int which;
329 int a2;
330 int a3;
331 int a4;
332 int a5;
333 int a6;
334 } */ *uap;
335{
336 int error;
337
338 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
339 return (ENOSYS);
340 if (uap->which < 0 ||
341 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
342 return (EINVAL);
343 error = (*msgcalls[uap->which])(td, &uap->a2);
344 return (error);
345}
346
347static void
348msg_freehdr(msghdr)
349 struct msg *msghdr;
350{
351 while (msghdr->msg_ts > 0) {
352 short next;
353 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
354 panic("msghdr->msg_spot out of range");

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1284SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
1285 "Maximum number of messages in the system");
1286SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
1287 "Size of a message segment");
1288SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
1289 "Number of message segments");
1290SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLFLAG_RD,
1291 NULL, 0, sysctl_msqids, "", "Message queue IDs");
314static void
315msg_freehdr(msghdr)
316 struct msg *msghdr;
317{
318 while (msghdr->msg_ts > 0) {
319 short next;
320 if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
321 panic("msghdr->msg_spot out of range");

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1251SYSCTL_INT(_kern_ipc, OID_AUTO, msgtql, CTLFLAG_RDTUN, &msginfo.msgtql, 0,
1252 "Maximum number of messages in the system");
1253SYSCTL_INT(_kern_ipc, OID_AUTO, msgssz, CTLFLAG_RDTUN, &msginfo.msgssz, 0,
1254 "Size of a message segment");
1255SYSCTL_INT(_kern_ipc, OID_AUTO, msgseg, CTLFLAG_RDTUN, &msginfo.msgseg, 0,
1256 "Number of message segments");
1257SYSCTL_PROC(_kern_ipc, OID_AUTO, msqids, CTLFLAG_RD,
1258 NULL, 0, sysctl_msqids, "", "Message queue IDs");
1259
1260#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1261 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1262SYSCALL_MODULE_HELPER(msgsys);
1263
1264/* XXX casting to (sy_call_t *) is bogus, as usual. */
1265static sy_call_t *msgcalls[] = {
1266 (sy_call_t *)msgctl, (sy_call_t *)msgget,
1267 (sy_call_t *)msgsnd, (sy_call_t *)msgrcv
1268};
1269
1270/*
1271 * Entry point for all MSG calls.
1272 */
1273int
1274msgsys(td, uap)
1275 struct thread *td;
1276 /* XXX actually varargs. */
1277 struct msgsys_args /* {
1278 int which;
1279 int a2;
1280 int a3;
1281 int a4;
1282 int a5;
1283 int a6;
1284 } */ *uap;
1285{
1286 int error;
1287
1288 if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1289 return (ENOSYS);
1290 if (uap->which < 0 ||
1291 uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
1292 return (EINVAL);
1293 error = (*msgcalls[uap->which])(td, &uap->a2);
1294 return (error);
1295}
1296#endif /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1297 COMPAT_FREEBSD7 */