c0c2557090
of explicit calls to lockmgr. Also provides macros for the flags pased to specify shared, exclusive or release which map to the lockmgr flags. This is so that the use of lockmgr can be easily replaced with optimized reader-writer locks. - Add some locking that I missed the first time.
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*
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* Copyright (c) 1995 Steven Wallace
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Steven Wallace.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/sysent.h>
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#include <sys/signalvar.h>
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#include <sys/proc.h>
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#include <i386/ibcs2/ibcs2_syscall.h>
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#include <i386/ibcs2/ibcs2_signal.h>
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MODULE_VERSION(ibcs2, 1);
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extern int bsd_to_ibcs2_errno[];
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extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
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extern int szsigcode;
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extern char sigcode[];
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struct sysentvec ibcs2_svr3_sysvec = {
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sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
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ibcs2_sysent,
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0xFF,
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IBCS2_SIGTBLSZ,
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bsd_to_ibcs2_sig,
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ELAST + 1,
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bsd_to_ibcs2_errno,
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0, /* trap-to-signal translation function */
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0, /* fixup */
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sendsig,
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sigcode, /* use generic trampoline */
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&szsigcode, /* use generic trampoline size */
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0, /* prepsyscall */
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"IBCS2 COFF",
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NULL, /* we don't have a COFF coredump function */
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NULL,
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IBCS2_MINSIGSTKSZ
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};
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/*
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* Create an "ibcs2" module that does nothing but allow checking for
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* the presence of the subsystem.
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*/
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static int
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ibcs2_modevent(module_t mod, int type, void *unused)
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{
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struct proc *p = NULL;
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int rval = 0;
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switch(type) {
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case MOD_UNLOAD:
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/* if this was an ELF module we'd use elf_brand_inuse()... */
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ALLPROC_LOCK(AP_SHARED);
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for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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if (p->p_sysent == &ibcs2_svr3_sysvec) {
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rval = EBUSY;
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break;
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}
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}
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ALLPROC_LOCK(AP_RELEASE);
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default:
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/* do not care */
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}
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return (rval);
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}
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static moduledata_t ibcs2_mod = {
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"ibcs2",
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ibcs2_modevent,
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0
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};
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DECLARE_MODULE(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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