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freebsd-dev/sys/kern/sysv_msg.c

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Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
/* $Id: sysv_msg.c,v 1.16 1997/08/02 14:31:37 bde Exp $ */
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
/*
* Implementation of SVID messages
*
* Author: Daniel Boulet
*
* Copyright 1993 Daniel Boulet and RTMX Inc.
*
* This system call was implemented by Daniel Boulet under contract from RTMX.
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that this entire comment appears intact.
*
* Redistribution in binary form may occur without any restrictions.
* Obviously, it would be nice if you gave credit where credit is due
* but requiring it would be too onerous.
*
* This software is provided ``AS IS'' without any warranties of any kind.
*/
#include <sys/param.h>
#include <sys/systm.h>
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
#include <sys/sysproto.h>
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/msg.h>
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
#include <sys/sysent.h>
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
Fixed init functions argument type - caddr_t -> void *. Fixed a couple of compiler warnings.
1995-09-09 18:10:37 +00:00
static void msginit __P((void *));
Reviewed by: julian with quick glances by bruce and others Submitted by: terry (terry lambert) This is a composite of 3 patch sets submitted by terry. they are: New low-level init code that supports loadbal modules better some cleanups in the namei code to help terry in 16-bit character support some changes to the mount-root code to make it a little more modular.. NOTE: mounting root off cdrom or NFS MIGHT be broken as I haven't been able to test those cases.. certainly mounting root of disk still works just fine.. mfs should work but is untested. (tomorrows task) The low level init stuff includes a total rewrite of init_main.c to make it possible for new modules to have an init phase by simply adding an entry to a TEXT_SET (or is it DATA_SET) list. thus a new module can be added to the kernel without editing any other files other than the 'files' file.
1995-08-28 09:19:25 +00:00
SYSINIT(sysv_msg, SI_SUB_SYSV_MSG, SI_ORDER_FIRST, msginit, NULL)
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
#define MSG_DEBUG
#undef MSG_DEBUG_OK
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#ifndef _SYS_SYSPROTO_H_
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
struct msgctl_args;
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
int msgctl __P((struct proc *p, struct msgctl_args *uap));
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
struct msgget_args;
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
int msgget __P((struct proc *p, struct msgget_args *uap));
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
struct msgsnd_args;
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
int msgsnd __P((struct proc *p, struct msgsnd_args *uap));
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
struct msgrcv_args;
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
int msgrcv __P((struct proc *p, struct msgrcv_args *uap));
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#endif
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
static void msg_freehdr __P((struct msg *msghdr));
/* XXX casting to (sy_call_t *) is bogus, as usual. */
A Major staticize sweep. Generates a couple of warnings that I'll deal with later. A number of unused vars removed. A number of unused procs removed or #ifdefed.
1995-12-14 08:32:45 +00:00
static sy_call_t *msgcalls[] = {
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
(sy_call_t *)msgctl, (sy_call_t *)msgget,
(sy_call_t *)msgsnd, (sy_call_t *)msgrcv
};
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
A Major staticize sweep. Generates a couple of warnings that I'll deal with later. A number of unused vars removed. A number of unused procs removed or #ifdefed.
1995-12-14 08:32:45 +00:00
static int nfree_msgmaps; /* # of free map entries */
static short free_msgmaps; /* head of linked list of free map entries */
static struct msg *free_msghdrs; /* list of free msg headers */
Eliminate sloppy common-style declarations. There should be none left for the LINT configuation.
1995-07-29 11:44:31 +00:00
char *msgpool; /* MSGMAX byte long msg buffer pool */
struct msgmap *msgmaps; /* MSGSEG msgmap structures */
struct msg *msghdrs; /* MSGTQL msg headers */
struct msqid_ds *msqids; /* MSGMNI msqid_ds struct's */
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
Got rid of compiler warnings.
1994-09-17 13:24:29 +00:00
void
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
msginit(dummy)
void *dummy;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
{
register int i;
/*
* msginfo.msgssz should be a power of two for efficiency reasons.
* It is also pretty silly if msginfo.msgssz is less than 8
* or greater than about 256 so ...
*/
i = 8;
while (i < 1024 && i != msginfo.msgssz)
i <<= 1;
if (i != msginfo.msgssz) {
printf("msginfo.msgssz=%d (0x%x)\n", msginfo.msgssz,
msginfo.msgssz);
panic("msginfo.msgssz not a small power of 2");
}
if (msginfo.msgseg > 32767) {
printf("msginfo.msgseg=%d\n", msginfo.msgseg);
panic("msginfo.msgseg > 32767");
}
if (msgmaps == NULL)
panic("msgmaps is NULL");
for (i = 0; i < msginfo.msgseg; i++) {
if (i > 0)
msgmaps[i-1].next = i;
msgmaps[i].next = -1; /* implies entry is available */
}
free_msgmaps = 0;
nfree_msgmaps = msginfo.msgseg;
if (msghdrs == NULL)
panic("msghdrs is NULL");
for (i = 0; i < msginfo.msgtql; i++) {
msghdrs[i].msg_type = 0;
if (i > 0)
msghdrs[i-1].msg_next = &msghdrs[i];
msghdrs[i].msg_next = NULL;
}
free_msghdrs = &msghdrs[0];
if (msqids == NULL)
panic("msqids is NULL");
for (i = 0; i < msginfo.msgmni; i++) {
msqids[i].msg_qbytes = 0; /* implies entry is available */
msqids[i].msg_perm.seq = 0; /* reset to a known value */
}
}
/*
* Entry point for all MSG calls
*/
int
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
msgsys(p, uap)
Start including <sys/sysproto.h> to get the correct args structs and prototypes for all syscalls. The args structs are still declared in comments as in VOP implementation functions. I don't like the duplication for this, but several more layers of changes are required to get it right. First we need to catch up with 4.4lite2, which uses macros to handle struct padding. Then we need to catch up with NetBSD, which passes the args correctly (as void *). Then we need to handle varargs functions and struct padding better. I think all the details can be hidden in machine-generated functions so that the args structs and verbose macros to reference them don't have to appear in the core sources. Add prototypes. Add bogus casts to hide the evil type puns exposed by the previous steps. &uap[1] was used to get at the args after the first. This worked because only the first arg in *uap was declared. This broke when the machine- genenerated args struct declared all the args (actually it declares extra args in some cases and depends on the user stack having some accessible junk after the last arg, not to mention the user args being on the stack. It isn't possible to declare a correct args struct for a varargs syscall). The msgsys(), semsys() and shmsys() syscall interfaces are BAD because they multiplex several syscalls that have different types of args. There was no reason to duplicate this sysv braindamage but now we're stuck with it. NetBSD has reimplemented the syscalls properly as separate syscalls #220-231. Declare static functions as static in both their prototype and their implementation (the latter is optional, and this misfeature was used). Remove gratuitous #includes. Continue cleaning up new init stuff.
1995-10-21 19:50:00 +00:00
struct proc *p;
/* XXX actually varargs. */
struct msgsys_args /* {
u_int which;
int a2;
int a3;
int a4;
int a5;
int a6;
} */ *uap;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
{
if (uap->which >= sizeof(msgcalls)/sizeof(msgcalls[0]))
return (EINVAL);
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
return ((*msgcalls[uap->which])(p, &uap->a2));
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
}
static void
msg_freehdr(msghdr)
struct msg *msghdr;
{
while (msghdr->msg_ts > 0) {
short next;
if (msghdr->msg_spot < 0 || msghdr->msg_spot >= msginfo.msgseg)
panic("msghdr->msg_spot out of range");
next = msgmaps[msghdr->msg_spot].next;
msgmaps[msghdr->msg_spot].next = free_msgmaps;
free_msgmaps = msghdr->msg_spot;
nfree_msgmaps++;
msghdr->msg_spot = next;
if (msghdr->msg_ts >= msginfo.msgssz)
msghdr->msg_ts -= msginfo.msgssz;
else
msghdr->msg_ts = 0;
}
if (msghdr->msg_spot != -1)
panic("msghdr->msg_spot != -1");
msghdr->msg_next = free_msghdrs;
free_msghdrs = msghdr;
}
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#ifndef _SYS_SYSPROTO_H_
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct msgctl_args {
int msqid;
int cmd;
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
struct msqid_ds *buf;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
};
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#endif
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
int
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
msgctl(p, uap)
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct proc *p;
register struct msgctl_args *uap;
{
int msqid = uap->msqid;
int cmd = uap->cmd;
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
struct msqid_ds *user_msqptr = uap->buf;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct ucred *cred = p->p_ucred;
All of this is cosmetic. prototypes, #includes, printfs and so on. Makes GCC a lot more silent.
1994-10-02 17:35:40 +00:00
int rval, eval;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct msqid_ds msqbuf;
register struct msqid_ds *msqptr;
#ifdef MSG_DEBUG_OK
printf("call to msgctl(%d, %d, 0x%x)\n", msqid, cmd, user_msqptr);
#endif
msqid = IPCID_TO_IX(msqid);
if (msqid < 0 || msqid >= msginfo.msgmni) {
#ifdef MSG_DEBUG_OK
printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid,
msginfo.msgmni);
#endif
return(EINVAL);
}
msqptr = &msqids[msqid];
if (msqptr->msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("no such msqid\n");
#endif
return(EINVAL);
}
if (msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) {
#ifdef MSG_DEBUG_OK
printf("wrong sequence number\n");
#endif
return(EINVAL);
}
eval = 0;
rval = 0;
switch (cmd) {
case IPC_RMID:
{
struct msg *msghdr;
if ((eval = ipcperm(cred, &msqptr->msg_perm, IPC_M)))
return(eval);
/* Free the message headers */
msghdr = msqptr->msg_first;
while (msghdr != NULL) {
struct msg *msghdr_tmp;
/* Free the segments of each message */
msqptr->msg_cbytes -= msghdr->msg_ts;
msqptr->msg_qnum--;
msghdr_tmp = msghdr;
msghdr = msghdr->msg_next;
msg_freehdr(msghdr_tmp);
}
if (msqptr->msg_cbytes != 0)
panic("msg_cbytes is screwed up");
if (msqptr->msg_qnum != 0)
panic("msg_qnum is screwed up");
msqptr->msg_qbytes = 0; /* Mark it as free */
wakeup((caddr_t)msqptr);
}
break;
case IPC_SET:
if ((eval = ipcperm(cred, &msqptr->msg_perm, IPC_M)))
return(eval);
if ((eval = copyin(user_msqptr, &msqbuf, sizeof(msqbuf))) != 0)
return(eval);
if (msqbuf.msg_qbytes > msqptr->msg_qbytes && cred->cr_uid != 0)
return(EPERM);
if (msqbuf.msg_qbytes > msginfo.msgmnb) {
#ifdef MSG_DEBUG_OK
printf("can't increase msg_qbytes beyond %d (truncating)\n",
msginfo.msgmnb);
#endif
msqbuf.msg_qbytes = msginfo.msgmnb; /* silently restrict qbytes to system limit */
}
if (msqbuf.msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("can't reduce msg_qbytes to 0\n");
#endif
return(EINVAL); /* non-standard errno! */
}
msqptr->msg_perm.uid = msqbuf.msg_perm.uid; /* change the owner */
msqptr->msg_perm.gid = msqbuf.msg_perm.gid; /* change the owner */
msqptr->msg_perm.mode = (msqptr->msg_perm.mode & ~0777) |
(msqbuf.msg_perm.mode & 0777);
msqptr->msg_qbytes = msqbuf.msg_qbytes;
msqptr->msg_ctime = time.tv_sec;
break;
case IPC_STAT:
if ((eval = ipcperm(cred, &msqptr->msg_perm, IPC_R))) {
#ifdef MSG_DEBUG_OK
printf("requester doesn't have read access\n");
#endif
return(eval);
}
eval = copyout((caddr_t)msqptr, user_msqptr,
sizeof(struct msqid_ds));
break;
default:
#ifdef MSG_DEBUG_OK
printf("invalid command %d\n", cmd);
#endif
return(EINVAL);
}
if (eval == 0)
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
p->p_retval[0] = rval;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
return(eval);
}
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#ifndef _SYS_SYSPROTO_H_
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct msgget_args {
key_t key;
int msgflg;
};
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#endif
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
int
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
msgget(p, uap)
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct proc *p;
register struct msgget_args *uap;
{
int msqid, eval;
int key = uap->key;
int msgflg = uap->msgflg;
struct ucred *cred = p->p_ucred;
Got rid of compiler warnings.
1994-09-17 13:24:29 +00:00
register struct msqid_ds *msqptr = NULL;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
#ifdef MSG_DEBUG_OK
printf("msgget(0x%x, 0%o)\n", key, msgflg);
#endif
if (key != IPC_PRIVATE) {
for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
msqptr = &msqids[msqid];
if (msqptr->msg_qbytes != 0 &&
msqptr->msg_perm.key == key)
break;
}
if (msqid < msginfo.msgmni) {
#ifdef MSG_DEBUG_OK
printf("found public key\n");
#endif
if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL)) {
#ifdef MSG_DEBUG_OK
printf("not exclusive\n");
#endif
return(EEXIST);
}
if ((eval = ipcperm(cred, &msqptr->msg_perm, msgflg & 0700 ))) {
#ifdef MSG_DEBUG_OK
printf("requester doesn't have 0%o access\n",
msgflg & 0700);
#endif
return(eval);
}
goto found;
}
}
#ifdef MSG_DEBUG_OK
printf("need to allocate the msqid_ds\n");
#endif
if (key == IPC_PRIVATE || (msgflg & IPC_CREAT)) {
for (msqid = 0; msqid < msginfo.msgmni; msqid++) {
/*
* Look for an unallocated and unlocked msqid_ds.
* msqid_ds's can be locked by msgsnd or msgrcv while
* they are copying the message in/out. We can't
* re-use the entry until they release it.
*/
msqptr = &msqids[msqid];
if (msqptr->msg_qbytes == 0 &&
(msqptr->msg_perm.mode & MSG_LOCKED) == 0)
break;
}
if (msqid == msginfo.msgmni) {
#ifdef MSG_DEBUG_OK
printf("no more msqid_ds's available\n");
#endif
Remove trailing whitespace.
1995-05-30 08:16:23 +00:00
return(ENOSPC);
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
}
#ifdef MSG_DEBUG_OK
printf("msqid %d is available\n", msqid);
#endif
msqptr->msg_perm.key = key;
msqptr->msg_perm.cuid = cred->cr_uid;
msqptr->msg_perm.uid = cred->cr_uid;
msqptr->msg_perm.cgid = cred->cr_gid;
msqptr->msg_perm.gid = cred->cr_gid;
msqptr->msg_perm.mode = (msgflg & 0777);
/* Make sure that the returned msqid is unique */
msqptr->msg_perm.seq++;
msqptr->msg_first = NULL;
msqptr->msg_last = NULL;
msqptr->msg_cbytes = 0;
msqptr->msg_qnum = 0;
msqptr->msg_qbytes = msginfo.msgmnb;
msqptr->msg_lspid = 0;
msqptr->msg_lrpid = 0;
msqptr->msg_stime = 0;
msqptr->msg_rtime = 0;
msqptr->msg_ctime = time.tv_sec;
} else {
#ifdef MSG_DEBUG_OK
printf("didn't find it and wasn't asked to create it\n");
#endif
return(ENOENT);
}
found:
/* Construct the unique msqid */
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
p->p_retval[0] = IXSEQ_TO_IPCID(msqid, msqptr->msg_perm);
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
return(0);
}
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#ifndef _SYS_SYSPROTO_H_
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct msgsnd_args {
int msqid;
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
void *msgp;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
size_t msgsz;
int msgflg;
};
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#endif
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
int
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
msgsnd(p, uap)
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct proc *p;
register struct msgsnd_args *uap;
{
int msqid = uap->msqid;
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
void *user_msgp = uap->msgp;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
size_t msgsz = uap->msgsz;
int msgflg = uap->msgflg;
int segs_needed, eval;
struct ucred *cred = p->p_ucred;
register struct msqid_ds *msqptr;
register struct msg *msghdr;
short next;
#ifdef MSG_DEBUG_OK
printf("call to msgsnd(%d, 0x%x, %d, %d)\n", msqid, user_msgp, msgsz,
msgflg);
#endif
msqid = IPCID_TO_IX(msqid);
if (msqid < 0 || msqid >= msginfo.msgmni) {
#ifdef MSG_DEBUG_OK
printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid,
msginfo.msgmni);
#endif
return(EINVAL);
}
msqptr = &msqids[msqid];
if (msqptr->msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("no such message queue id\n");
#endif
return(EINVAL);
}
if (msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) {
#ifdef MSG_DEBUG_OK
printf("wrong sequence number\n");
#endif
return(EINVAL);
}
if ((eval = ipcperm(cred, &msqptr->msg_perm, IPC_W))) {
#ifdef MSG_DEBUG_OK
printf("requester doesn't have write access\n");
#endif
return(eval);
}
segs_needed = (msgsz + msginfo.msgssz - 1) / msginfo.msgssz;
#ifdef MSG_DEBUG_OK
printf("msgsz=%d, msgssz=%d, segs_needed=%d\n", msgsz, msginfo.msgssz,
segs_needed);
#endif
for (;;) {
int need_more_resources = 0;
/*
* check msgsz
* (inside this loop in case msg_qbytes changes while we sleep)
*/
Got rid of compiler warnings.
1994-09-17 13:24:29 +00:00
if (msgsz > msqptr->msg_qbytes) {
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
#ifdef MSG_DEBUG_OK
printf("msgsz > msqptr->msg_qbytes\n");
#endif
return(EINVAL);
}
if (msqptr->msg_perm.mode & MSG_LOCKED) {
#ifdef MSG_DEBUG_OK
printf("msqid is locked\n");
#endif
need_more_resources = 1;
}
if (msgsz + msqptr->msg_cbytes > msqptr->msg_qbytes) {
#ifdef MSG_DEBUG_OK
printf("msgsz + msg_cbytes > msg_qbytes\n");
#endif
need_more_resources = 1;
}
if (segs_needed > nfree_msgmaps) {
#ifdef MSG_DEBUG_OK
printf("segs_needed > nfree_msgmaps\n");
#endif
need_more_resources = 1;
}
if (free_msghdrs == NULL) {
#ifdef MSG_DEBUG_OK
printf("no more msghdrs\n");
#endif
need_more_resources = 1;
}
if (need_more_resources) {
int we_own_it;
if ((msgflg & IPC_NOWAIT) != 0) {
#ifdef MSG_DEBUG_OK
printf("need more resources but caller doesn't want to wait\n");
#endif
return(EAGAIN);
}
if ((msqptr->msg_perm.mode & MSG_LOCKED) != 0) {
#ifdef MSG_DEBUG_OK
printf("we don't own the msqid_ds\n");
#endif
we_own_it = 0;
} else {
/* Force later arrivals to wait for our
request */
#ifdef MSG_DEBUG_OK
printf("we own the msqid_ds\n");
#endif
msqptr->msg_perm.mode |= MSG_LOCKED;
we_own_it = 1;
}
#ifdef MSG_DEBUG_OK
printf("goodnight\n");
#endif
eval = tsleep((caddr_t)msqptr, (PZERO - 4) | PCATCH,
"msgwait", 0);
#ifdef MSG_DEBUG_OK
printf("good morning, eval=%d\n", eval);
#endif
if (we_own_it)
msqptr->msg_perm.mode &= ~MSG_LOCKED;
if (eval != 0) {
#ifdef MSG_DEBUG_OK
printf("msgsnd: interrupted system call\n");
#endif
return(EINTR);
}
/*
* Make sure that the msq queue still exists
*/
if (msqptr->msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("msqid deleted\n");
#endif
/* The SVID says to return EIDRM. */
#ifdef EIDRM
return(EIDRM);
#else
/* Unfortunately, BSD doesn't define that code
yet! */
return(EINVAL);
#endif
}
} else {
#ifdef MSG_DEBUG_OK
printf("got all the resources that we need\n");
#endif
break;
}
}
/*
* We have the resources that we need.
* Make sure!
*/
if (msqptr->msg_perm.mode & MSG_LOCKED)
panic("msg_perm.mode & MSG_LOCKED");
if (segs_needed > nfree_msgmaps)
panic("segs_needed > nfree_msgmaps");
if (msgsz + msqptr->msg_cbytes > msqptr->msg_qbytes)
panic("msgsz + msg_cbytes > msg_qbytes");
if (free_msghdrs == NULL)
panic("no more msghdrs");
/*
* Re-lock the msqid_ds in case we page-fault when copying in the
* message
*/
if ((msqptr->msg_perm.mode & MSG_LOCKED) != 0)
panic("msqid_ds is already locked");
msqptr->msg_perm.mode |= MSG_LOCKED;
/*
* Allocate a message header
*/
msghdr = free_msghdrs;
free_msghdrs = msghdr->msg_next;
msghdr->msg_spot = -1;
msghdr->msg_ts = msgsz;
/*
* Allocate space for the message
*/
while (segs_needed > 0) {
if (nfree_msgmaps <= 0)
panic("not enough msgmaps");
if (free_msgmaps == -1)
panic("nil free_msgmaps");
next = free_msgmaps;
if (next <= -1)
panic("next too low #1");
if (next >= msginfo.msgseg)
panic("next out of range #1");
#ifdef MSG_DEBUG_OK
printf("allocating segment %d to message\n", next);
#endif
free_msgmaps = msgmaps[next].next;
nfree_msgmaps--;
msgmaps[next].next = msghdr->msg_spot;
msghdr->msg_spot = next;
segs_needed--;
}
/*
* Copy in the message type
*/
if ((eval = copyin(user_msgp, &msghdr->msg_type,
sizeof(msghdr->msg_type))) != 0) {
#ifdef MSG_DEBUG_OK
printf("error %d copying the message type\n", eval);
#endif
msg_freehdr(msghdr);
msqptr->msg_perm.mode &= ~MSG_LOCKED;
wakeup((caddr_t)msqptr);
return(eval);
}
Don't depend in the kernel on the gcc feature of doing arithmetic on pointers of type `void *'. Warn about this in future.
1996-08-31 14:48:13 +00:00
user_msgp = (char *)user_msgp + sizeof(msghdr->msg_type);
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
/*
* Validate the message type
*/
if (msghdr->msg_type < 1) {
msg_freehdr(msghdr);
msqptr->msg_perm.mode &= ~MSG_LOCKED;
wakeup((caddr_t)msqptr);
#ifdef MSG_DEBUG_OK
printf("mtype (%d) < 1\n", msghdr->msg_type);
#endif
return(EINVAL);
}
/*
* Copy in the message body
*/
next = msghdr->msg_spot;
while (msgsz > 0) {
size_t tlen;
if (msgsz > msginfo.msgssz)
tlen = msginfo.msgssz;
else
tlen = msgsz;
if (next <= -1)
panic("next too low #2");
if (next >= msginfo.msgseg)
panic("next out of range #2");
if ((eval = copyin(user_msgp, &msgpool[next * msginfo.msgssz],
tlen)) != 0) {
#ifdef MSG_DEBUG_OK
printf("error %d copying in message segment\n", eval);
#endif
msg_freehdr(msghdr);
msqptr->msg_perm.mode &= ~MSG_LOCKED;
wakeup((caddr_t)msqptr);
return(eval);
}
msgsz -= tlen;
Don't depend in the kernel on the gcc feature of doing arithmetic on pointers of type `void *'. Warn about this in future.
1996-08-31 14:48:13 +00:00
user_msgp = (char *)user_msgp + tlen;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
next = msgmaps[next].next;
}
if (next != -1)
panic("didn't use all the msg segments");
/*
* We've got the message. Unlock the msqid_ds.
*/
msqptr->msg_perm.mode &= ~MSG_LOCKED;
/*
* Make sure that the msqid_ds is still allocated.
*/
if (msqptr->msg_qbytes == 0) {
msg_freehdr(msghdr);
wakeup((caddr_t)msqptr);
/* The SVID says to return EIDRM. */
#ifdef EIDRM
return(EIDRM);
#else
/* Unfortunately, BSD doesn't define that code yet! */
return(EINVAL);
#endif
}
/*
* Put the message into the queue
*/
if (msqptr->msg_first == NULL) {
msqptr->msg_first = msghdr;
msqptr->msg_last = msghdr;
} else {
msqptr->msg_last->msg_next = msghdr;
msqptr->msg_last = msghdr;
}
msqptr->msg_last->msg_next = NULL;
msqptr->msg_cbytes += msghdr->msg_ts;
msqptr->msg_qnum++;
msqptr->msg_lspid = p->p_pid;
msqptr->msg_stime = time.tv_sec;
wakeup((caddr_t)msqptr);
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
p->p_retval[0] = 0;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
return(0);
}
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#ifndef _SYS_SYSPROTO_H_
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct msgrcv_args {
int msqid;
void *msgp;
size_t msgsz;
long msgtyp;
int msgflg;
};
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
#endif
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
Update sysv_*.c to get their argument definitions from sysproto.h
1995-12-15 05:00:31 +00:00
int
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
msgrcv(p, uap)
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
struct proc *p;
register struct msgrcv_args *uap;
{
int msqid = uap->msqid;
void *user_msgp = uap->msgp;
size_t msgsz = uap->msgsz;
long msgtyp = uap->msgtyp;
int msgflg = uap->msgflg;
size_t len;
struct ucred *cred = p->p_ucred;
register struct msqid_ds *msqptr;
register struct msg *msghdr;
int eval;
short next;
#ifdef MSG_DEBUG_OK
printf("call to msgrcv(%d, 0x%x, %d, %ld, %d)\n", msqid, user_msgp,
msgsz, msgtyp, msgflg);
#endif
msqid = IPCID_TO_IX(msqid);
if (msqid < 0 || msqid >= msginfo.msgmni) {
#ifdef MSG_DEBUG_OK
printf("msqid (%d) out of range (0<=msqid<%d)\n", msqid,
msginfo.msgmni);
#endif
return(EINVAL);
}
msqptr = &msqids[msqid];
if (msqptr->msg_qbytes == 0) {
#ifdef MSG_DEBUG_OK
printf("no such message queue id\n");
#endif
return(EINVAL);
}
if (msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) {
#ifdef MSG_DEBUG_OK
printf("wrong sequence number\n");
#endif
return(EINVAL);
}
if ((eval = ipcperm(cred, &msqptr->msg_perm, IPC_R))) {
#ifdef MSG_DEBUG_OK
printf("requester doesn't have read access\n");
#endif
return(eval);
}
msghdr = NULL;
while (msghdr == NULL) {
if (msgtyp == 0) {
msghdr = msqptr->msg_first;
if (msghdr != NULL) {
if (msgsz < msghdr->msg_ts &&
(msgflg & MSG_NOERROR) == 0) {
#ifdef MSG_DEBUG_OK
printf("first message on the queue is too big (want %d, got %d)\n",
msgsz, msghdr->msg_ts);
#endif
return(E2BIG);
}
if (msqptr->msg_first == msqptr->msg_last) {
msqptr->msg_first = NULL;
msqptr->msg_last = NULL;
} else {
msqptr->msg_first = msghdr->msg_next;
if (msqptr->msg_first == NULL)
panic("msg_first/last screwed up #1");
}
}
} else {
struct msg *previous;
struct msg **prev;
previous = NULL;
prev = &(msqptr->msg_first);
while ((msghdr = *prev) != NULL) {
/*
* Is this message's type an exact match or is
* this message's type less than or equal to
* the absolute value of a negative msgtyp?
* Note that the second half of this test can
* NEVER be true if msgtyp is positive since
* msg_type is always positive!
*/
if (msgtyp == msghdr->msg_type ||
msghdr->msg_type <= -msgtyp) {
#ifdef MSG_DEBUG_OK
printf("found message type %d, requested %d\n",
msghdr->msg_type, msgtyp);
#endif
if (msgsz < msghdr->msg_ts &&
(msgflg & MSG_NOERROR) == 0) {
#ifdef MSG_DEBUG_OK
printf("requested message on the queue is too big (want %d, got %d)\n",
msgsz, msghdr->msg_ts);
#endif
return(E2BIG);
}
*prev = msghdr->msg_next;
if (msghdr == msqptr->msg_last) {
if (previous == NULL) {
if (prev !=
&msqptr->msg_first)
panic("msg_first/last screwed up #2");
msqptr->msg_first =
NULL;
msqptr->msg_last =
NULL;
} else {
if (prev ==
&msqptr->msg_first)
panic("msg_first/last screwed up #3");
msqptr->msg_last =
previous;
}
}
break;
}
previous = msghdr;
prev = &(msghdr->msg_next);
}
}
/*
* We've either extracted the msghdr for the appropriate
* message or there isn't one.
* If there is one then bail out of this loop.
*/
if (msghdr != NULL)
break;
/*
* Hmph! No message found. Does the user want to wait?
*/
if ((msgflg & IPC_NOWAIT) != 0) {
#ifdef MSG_DEBUG_OK
printf("no appropriate message found (msgtyp=%d)\n",
msgtyp);
#endif
/* The SVID says to return ENOMSG. */
#ifdef ENOMSG
return(ENOMSG);
#else
/* Unfortunately, BSD doesn't define that code yet! */
return(EAGAIN);
#endif
}
/*
* Wait for something to happen
*/
#ifdef MSG_DEBUG_OK
printf("msgrcv: goodnight\n");
#endif
eval = tsleep((caddr_t)msqptr, (PZERO - 4) | PCATCH, "msgwait",
0);
#ifdef MSG_DEBUG_OK
printf("msgrcv: good morning (eval=%d)\n", eval);
#endif
if (eval != 0) {
#ifdef MSG_DEBUG_OK
printf("msgsnd: interrupted system call\n");
#endif
return(EINTR);
}
/*
* Make sure that the msq queue still exists
*/
if (msqptr->msg_qbytes == 0 ||
msqptr->msg_perm.seq != IPCID_TO_SEQ(uap->msqid)) {
#ifdef MSG_DEBUG_OK
printf("msqid deleted\n");
#endif
/* The SVID says to return EIDRM. */
#ifdef EIDRM
return(EIDRM);
#else
/* Unfortunately, BSD doesn't define that code yet! */
return(EINVAL);
#endif
}
}
/*
* Return the message to the user.
*
* First, do the bookkeeping (before we risk being interrupted).
*/
msqptr->msg_cbytes -= msghdr->msg_ts;
msqptr->msg_qnum--;
msqptr->msg_lrpid = p->p_pid;
msqptr->msg_rtime = time.tv_sec;
/*
* Make msgsz the actual amount that we'll be returning.
* Note that this effectively truncates the message if it is too long
* (since msgsz is never increased).
*/
#ifdef MSG_DEBUG_OK
printf("found a message, msgsz=%d, msg_ts=%d\n", msgsz,
msghdr->msg_ts);
#endif
if (msgsz > msghdr->msg_ts)
msgsz = msghdr->msg_ts;
/*
* Return the type to the user.
*/
eval = copyout((caddr_t)&(msghdr->msg_type), user_msgp,
sizeof(msghdr->msg_type));
if (eval != 0) {
#ifdef MSG_DEBUG_OK
printf("error (%d) copying out message type\n", eval);
#endif
msg_freehdr(msghdr);
wakeup((caddr_t)msqptr);
return(eval);
}
Don't depend in the kernel on the gcc feature of doing arithmetic on pointers of type `void *'. Warn about this in future.
1996-08-31 14:48:13 +00:00
user_msgp = (char *)user_msgp + sizeof(msghdr->msg_type);
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
/*
* Return the segments to the user
*/
next = msghdr->msg_spot;
for (len = 0; len < msgsz; len += msginfo.msgssz) {
size_t tlen;
if (msgsz > msginfo.msgssz)
tlen = msginfo.msgssz;
else
tlen = msgsz;
if (next <= -1)
panic("next too low #3");
if (next >= msginfo.msgseg)
panic("next out of range #3");
eval = copyout((caddr_t)&msgpool[next * msginfo.msgssz],
user_msgp, tlen);
if (eval != 0) {
#ifdef MSG_DEBUG_OK
printf("error (%d) copying out message segment\n",
eval);
#endif
msg_freehdr(msghdr);
wakeup((caddr_t)msqptr);
return(eval);
}
Don't depend in the kernel on the gcc feature of doing arithmetic on pointers of type `void *'. Warn about this in future.
1996-08-31 14:48:13 +00:00
user_msgp = (char *)user_msgp + tlen;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
next = msgmaps[next].next;
}
/*
* Done, return the actual number of bytes copied out.
*/
msg_freehdr(msghdr);
wakeup((caddr_t)msqptr);
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
p->p_retval[0] = msgsz;
Added SYSV ipcs. Obtained from: NetBSD and FreeBSD-1.1.5
1994-09-13 14:47:38 +00:00
return(0);
}
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