Imported Upstream version 93u+upstream

1 files changed, 518 insertions, 0 deletions

diff --git a/src/lib/libast/vmalloc/vmmopen.c b/src/lib/libast/vmalloc/vmmopen.c
new file mode 100644
index 0000000..4523cae
--- /dev/null
+++ b/src/lib/libast/vmalloc/vmmopen.c
@@ -0,0 +1,518 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2012 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#if defined(_UWIN) && defined(_BLD_ast)
+
+void _STUB_vmmapopen(){}
+
+#else
+
+#include	"vmhdr.h"
+#include	<sys/types.h>
+#include	<string.h>
+#if _hdr_unistd
+#include	<unistd.h>
+#endif
+
+#undef	ALIGN	/* some sys/param.h define this */
+
+#include	<sys/mman.h>	/* mmap() headers	*/
+#include	<sys/file.h>
+#include	<sys/stat.h>
+#include	<fcntl.h>
+
+#include	<sys/shm.h>	/* shm headers		*/
+#include	<sys/ipc.h>
+
+#undef	ALIGN
+#define ALIGN	sizeof(struct _align_s)
+
+/* Create a region to allocate based on mmap() or shmget().
+** Both ways provide for share memory allocation.
+** mmap() also allows for allocating persistent data.
+**
+** Written by Kiem-Phong Vo (kpv@research.att.com)
+*/
+
+#define MM_INIT		001	/* initialization mode	*/
+
+#define MM_RELEASE	010	/* release share mem	*/
+#define MM_CLEANUP	020	/* clean up resources	*/
+
+/* magic word signaling region is being initialized */
+#define MM_LETMEDOIT	((unsigned int)(('N'<<24) | ('B'<<16) | ('&'<<8) | ('I')) )
+
+/* magic word signaling file/segment is ready */
+#define	MM_MAGIC	((unsigned int)(('P'<<24) | ('&'<<16) | ('N'<<8) | ('8')) )
+
+/* default mimimum region size */
+#define MM_MINSIZE	(64*_Vmpagesize)
+
+/* macros to get the data section and size */
+#define MMHEAD(file)	ROUND(sizeof(Mmvm_t)+strlen(file), ALIGN)
+#define MMDATA(mmvm)	((Vmuchar_t*)(mmvm)->base + MMHEAD(mmvm->file))
+#define MMSIZE(mmvm)	((mmvm)->size - MMHEAD(mmvm->file))
+
+#ifdef S_IRUSR
+#define FILE_MODE	(S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
+#else
+#define FILE_MODE	0644
+#endif
+
+/* to store key/value pairs for application */
+typedef struct _mmuser_s	Mmuser_t;
+struct _mmuser_s
+{	Mmuser_t*	next;	/* link list		*/
+	int		key;	/* identifying key	*/
+	Void_t*		val;	/* associated value	*/
+};
+
+typedef struct _mmvm_s
+{	unsigned int	magic;	/* magic bytes		*/
+	Void_t*		base;	/* address to map to	*/
+	ssize_t		size;	/* total data size	*/
+	ssize_t		busy;	/* amount in use	*/
+	Mmuser_t*	user;	/* stored (key,val)'s	*/
+	int		proj;	/* project number	*/
+	char		file[1];/* file name		*/
+} Mmvm_t;
+
+typedef struct _mmdisc_s
+{	Vmdisc_t	disc;	/* Vmalloc discipline	*/
+	int		flag;	/* various modes	*/
+	Mmvm_t*		mmvm;	/* shared memory data	*/
+	ssize_t		size;	/* desired file size	*/
+	int		shmid;	/* ID of the shared mem	*/
+	int		proj;	/* shm project ID 	*/
+	char		file[1];/* backing store/ftok()	*/
+} Mmdisc_t;
+
+#if DEBUG
+#include	<stdio.h>
+#include	<string.h>
+int _vmmdump(Vmalloc_t* vm, int fd)
+{
+	char		mesg[1024];
+	Mmdisc_t	*mmdc = (Mmdisc_t*)vm->disc;
+
+	fd = fd < 0 ? 2 : fd;
+	sprintf(mesg, "File: %s\n", mmdc->file ); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Project: %10d\n", mmdc->proj); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Memory:  %#010lx\n", mmdc->mmvm); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Size:    %10d\n", mmdc->size); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Shmid:   %10d\n", mmdc->shmid); write(fd, mesg, strlen(mesg));
+
+	sprintf(mesg, "File header:\n"); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Magic:   %10d\n", mmdc->mmvm->magic); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Base:    %#010lx\n", mmdc->mmvm->base); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Size:    %10d\n", mmdc->mmvm->size); write(fd, mesg, strlen(mesg));
+	sprintf(mesg, "Busy:    %10d\n", mmdc->mmvm->busy); write(fd, mesg, strlen(mesg));
+	return 0;
+}
+#endif /*DEBUG*/
+
+/* fix the mapped address for a region */
+static Mmvm_t* mmfix(Mmvm_t* mmvm, Mmdisc_t* mmdc, int fd)
+{
+	Void_t	*base = mmvm->base;
+	ssize_t	size = mmvm->size;
+
+	if(base != (Void_t*)mmvm) /* mmvm is not right yet */
+	{	/**/ASSERT(!base || (base && (VLONG(base)%_Vmpagesize) == 0) );
+		if(mmdc->proj < 0)
+		{	munmap((Void_t*)mmvm, size); 
+			mmvm = (Mmvm_t*)mmap(base, size, (PROT_READ|PROT_WRITE),
+					     (MAP_FIXED|MAP_SHARED), fd, (off_t)0 );
+		}
+		else
+		{	shmdt((Void_t*)mmvm);
+			mmvm = (Mmvm_t*)shmat(mmdc->shmid, base, 0);
+		}
+		if(!mmvm || mmvm == (Mmvm_t*)(-1) )
+			mmvm = NIL(Mmvm_t*);
+	}
+
+	return mmvm;
+}
+
+/* initialize region data */
+static int mminit(Mmdisc_t* mmdc)
+{
+	struct shmid_ds	shmds;
+	Void_t		*base;
+	int		try, k;
+	int		fd = -1;
+	key_t		key = -1;
+	ssize_t		extent, size = 0;
+	Mmvm_t		*mmvm = NIL(Mmvm_t*);
+	int		rv = -1;
+
+	if(mmdc->mmvm) /* already done this */
+		return 0;
+
+	/* fixed size region so make it reasonably large */
+	if((size = mmdc->size) < MM_MINSIZE )
+		size =  MM_MINSIZE;
+	size += MMHEAD(mmdc->file) + ALIGN;
+	size  = ROUND(size, _Vmpagesize);
+
+	/* this op can happen simultaneously in different processes */
+	if((fd = open(mmdc->file, O_RDWR|O_CREAT, FILE_MODE)) < 0)
+		return -1;
+
+	/* get/create the initial segment of data */
+	if(mmdc->proj < 0 ) /* proj < 0 means doing mmap() */
+	{	/* Note that the location being written to is always zero! */
+		if((extent = (ssize_t)lseek(fd, (off_t)0, SEEK_END)) < 0)
+			goto done;
+		if(extent < size) /* make the file size large enough */
+			if(lseek(fd, (off_t)size, 0) != (off_t)size || write(fd, "", 1) != 1 )
+				goto done;
+
+		/* map the file into memory */
+		mmvm = (Mmvm_t*)mmap(NIL(Void_t*), size, (PROT_READ|PROT_WRITE),
+		 		     MAP_SHARED, fd, (off_t)0 );
+	}
+	else 
+	{	/* make the key and get/create an id for the share mem segment */
+		if((key = ftok(mmdc->file, mmdc->proj)) < 0 )
+			goto done;
+		if((mmdc->shmid = shmget(key, size, IPC_CREAT|FILE_MODE)) < 0 )
+			goto done;
+
+		/* map the data segment into memory */
+		mmvm = (Mmvm_t*)shmat(mmdc->shmid, NIL(Void_t*), 0);
+	}
+
+	if(!mmvm || mmvm == (Mmvm_t*)(-1) ) /* initial mapping failed */
+		goto done;
+
+	/* all processes compete for the chore to initialize data */
+	if(asocasint(&mmvm->magic, 0, MM_LETMEDOIT) == 0 ) /* lucky winner: us! */
+	{	if(!(base = vmmaddress(size)) ) /* get a suitable base for the map */
+			base = (Void_t*)mmvm;
+		mmdc->flag |= MM_INIT;
+		mmvm->base = base;
+		mmvm->size = size;
+		mmvm->busy = 0;
+		mmvm->proj = mmdc->proj;
+		strcpy(mmvm->file, mmdc->file);
+		if(mmdc->proj < 0 ) /* flush to file */
+			msync((Void_t*)mmvm, MMHEAD(mmvm->file), MS_SYNC);
+
+		if(mmvm->base != (Void_t*)mmvm) /* not yet at the right address */
+			if(!(mmvm = mmfix(mmvm, mmdc, fd)) )
+				goto done;
+		rv = 0; /* success, return this value to indicate a new map */
+	}
+	else /* wait for someone else to finish initialization */
+	{	/**/ASSERT(!(mmdc->flag&MM_INIT));
+		if(mmvm->magic != MM_LETMEDOIT && mmvm->magic != MM_MAGIC)
+			goto done;
+
+		for(try = 0, k = 0;; ASOLOOP(k) ) /* waiting */
+		{	if(asocasint(&mmvm->magic, MM_MAGIC, MM_MAGIC) == MM_MAGIC )
+				break;
+			else if((try += 1) <= 0 ) /* too many tries */
+				goto done;
+		}
+
+		/* mapped the wrong memory */
+		if(mmvm->proj != mmdc->proj || strcmp(mmvm->file, mmdc->file) != 0 )
+			goto done;
+
+		if(mmvm->base != (Void_t*)mmvm) /* not yet at the right address */
+			if(!(mmvm = mmfix(mmvm, mmdc, fd)) )
+				goto done;
+		rv = 1; /* success, return this value to indicate a finished map */
+	}
+
+done:	(void)close(fd);
+
+	if(rv >= 0 ) /* successful construction of region */
+	{	/**/ASSERT(mmvm && mmvm != (Mmvm_t*)(-1));
+		mmdc->mmvm = mmvm;
+	}
+	else if(mmvm && mmvm != (Mmvm_t*)(-1)) /* error, remove map */
+	{	if(mmdc->proj < 0)
+			(void)munmap((Void_t*)mmvm, size);
+		else	(void)shmdt((Void_t*)mmvm);
+	}
+
+	return rv;
+}
+
+#if __STD_C /* end a file mapping */
+static int mmend(Mmdisc_t* mmdc)
+#else
+static int mmend(mmdc)
+Mmdisc_t*	mmdc;
+#endif
+{
+	Mmvm_t		*mmvm;
+	struct shmid_ds	shmds;
+
+	if(!(mmvm = mmdc->mmvm) )
+		return 0;
+
+	if(mmdc->proj < 0 )
+	{	(void)msync(mmvm->base, mmvm->size, MS_ASYNC);
+		if(mmdc->flag&MM_RELEASE)
+		{	if(mmvm->base )
+				(void)munmap(mmvm->base, mmvm->size);
+		}
+		if(mmdc->flag&MM_CLEANUP)
+			(void)unlink(mmdc->file);
+	}
+	else 
+	{	if(mmdc->flag&MM_RELEASE)
+		{	if(mmvm->base )
+				(void)shmdt(mmvm->base);
+		}
+		if(mmdc->flag&MM_CLEANUP)
+		{	if(mmdc->shmid >= 0 )
+				(void)shmctl(mmdc->shmid, IPC_RMID, &shmds);
+		}
+	}
+
+	mmdc->mmvm = NIL(Mmvm_t*);
+	return 0;
+}
+
+#if __STD_C
+static Void_t* mmgetmem(Vmalloc_t* vm, Void_t* caddr,
+			size_t csize, size_t nsize, Vmdisc_t* disc)
+#else
+static Void_t* mmgetmem(vm, caddr, csize, nsize, disc)
+Vmalloc_t*	vm;
+Void_t*		caddr;
+size_t		csize;
+size_t		nsize;
+Vmdisc_t*	disc;
+#endif
+{
+	Mmvm_t		*mmvm;
+	Mmdisc_t	*mmdc = (Mmdisc_t*)disc;
+
+	if(!(mmvm = mmdc->mmvm) ) /* bad data */
+		return NIL(Void_t*);
+
+	/* this region allows only a single busy block! */
+	if(caddr) /* resizing/freeing an existing block */
+	{	if(caddr == MMDATA(mmvm) && nsize <= MMSIZE(mmvm) )
+		{	mmvm->busy = nsize;
+			return MMDATA(mmvm);
+		}
+		else	return NIL(Void_t*);
+	}
+	else /* requesting a new block */
+	{	if(mmvm->busy == 0 )
+		{	mmvm->busy = nsize;
+			return MMDATA(mmvm);
+		}
+		else	return NIL(Void_t*);
+	}
+}
+
+#if __STD_C
+static int mmexcept(Vmalloc_t* vm, int type, Void_t* data, Vmdisc_t* disc)
+#else
+static int mmexcept(vm, type, data, disc)
+Vmalloc_t*	vm;
+int		type;
+Void_t*		data;
+Vmdisc_t*	disc;
+#endif
+{
+	int		rv;
+	Void_t		*base;
+	Vmdata_t	*vd = vm->data;
+	Mmdisc_t	*mmdc = (Mmdisc_t*)disc;
+
+	if(type == VM_OPEN)
+	{	if(data) /* VM_OPEN event at start of vmopen() */
+		{	if((rv = mminit(mmdc)) < 0 ) /* initialization failed */
+				return -1;
+			else if(rv == 0) /* just started a new map */
+			{	/**/ASSERT(mmdc->flag&MM_INIT);
+				/**/ASSERT(mmdc->mmvm->magic == MM_LETMEDOIT);
+				return 0;
+			}
+			else /* an existing map was reconstructed */
+			{	/**/ASSERT(!(mmdc->flag&MM_INIT));
+				/**/ASSERT(mmdc->mmvm->magic == MM_MAGIC);
+				*((Void_t**)data) = MMDATA(mmdc->mmvm);
+				return 1;
+			}
+		}
+		else	return 0;
+	}
+	else if(type == VM_ENDOPEN) /* at end of vmopen() */
+	{	if(mmdc->flag&MM_INIT) /* this is the initializing process! */
+		{	/**/ASSERT(mmdc->mmvm->magic == MM_LETMEDOIT);
+			asocasint(&mmdc->mmvm->magic, MM_LETMEDOIT, MM_MAGIC);
+
+			if(mmdc->proj < 0) /* sync data to file now */
+				msync((Void_t*)mmdc->mmvm, MMHEAD(mmdc->file), MS_SYNC);
+		} /**/ASSERT(mmdc->mmvm->magic == MM_MAGIC);
+		return 0;
+	}
+	else if(type == VM_CLOSE)
+		return 1; /* tell vmclose not to free memory segments */
+	else if(type == VM_ENDCLOSE) /* this is the final closing event */
+	{	(void)mmend(mmdc);
+		(void)vmfree(Vmheap, mmdc);
+		return 0; /* all done */
+	}
+	else	return 0;
+}
+
+#if __STD_C
+Vmalloc_t* vmmopen(char* file, int proj, ssize_t size )
+#else
+Vmalloc_t* vmmopen(file, proj, size )
+char*		file;	/* file for key or data backing */
+int		proj;	/* project ID, < 0 doing mmap	*/
+ssize_t		size;	/* desired size for mem segment	*/
+#endif
+{
+	Vmalloc_t	*vm;
+	Mmdisc_t	*mmdc;
+
+	GETPAGESIZE(_Vmpagesize);
+
+	if(!file || !file[0] )
+		return NIL(Vmalloc_t*);
+
+	/* create discipline structure for getting memory from mmap */
+	if(!(mmdc = vmalloc(Vmheap, sizeof(Mmdisc_t)+strlen(file))) )
+		return NIL(Vmalloc_t*);
+	memset(mmdc, 0, sizeof(Mmdisc_t));
+	mmdc->disc.memoryf = mmgetmem;
+	mmdc->disc.exceptf = mmexcept;
+	mmdc->disc.round   = _Vmpagesize; /* round request to this size */
+	mmdc->mmvm = NIL(Mmvm_t*);
+	mmdc->size = size;
+	mmdc->shmid = -1;
+	mmdc->flag = 0;
+	mmdc->proj = proj;
+	strcpy(mmdc->file, file);
+
+	/* now open the Vmalloc_t handle to return to application */
+	if(!(vm = vmopen(&mmdc->disc, Vmbest, VM_SHARE)) )
+	{	(void)mmend(mmdc);
+		(void)vmfree(Vmheap, mmdc);
+		return NIL(Vmalloc_t*);
+	}
+	else
+	{	/**/ASSERT(mmdc->mmvm && mmdc->mmvm->magic == MM_MAGIC);
+		return vm;
+	}
+}
+
+/* to store (key,value) data in the map */
+#if __STD_C
+Void_t* vmmvalue(Vmalloc_t* vm, int key, Void_t* val, int oper)
+#else
+Void_t* vmmvalue(vm, key, val, oper)
+Vmalloc_t*	vm;	/* a region based on vmmapopen	*/
+int		key;	/* key of data to be set	*/
+Void_t*		val;	/* data to be set		*/
+int		oper;	/* operation type		*/
+#endif
+{
+	Mmuser_t	*u;
+	Vmdata_t	*vd = vm->data;
+	Mmdisc_t	*mmdc = (Mmdisc_t*)vm->disc;
+	Mmvm_t		*mmvm = mmdc->mmvm;
+
+	/* check to see if operation is well-defined */
+	if(oper != VM_MMGET && oper != VM_MMSET && oper != VM_MMADD)
+		return NIL(Void_t*);
+
+	SETLOCK(vm, 0);
+
+	/* find the key */
+	for(u = mmvm->user; u; u = u->next)
+		if(u->key == key)
+			break;
+
+	if(!u && (oper == VM_MMSET || oper == VM_MMADD) )
+	{	if((u = KPVALLOC(vm, sizeof(Mmuser_t), vm->meth.allocf)) )
+		{	u->val  = NIL(Void_t*);
+			u->key  = key;
+			u->next = mmvm->user;
+			mmvm->user = u;
+		}
+	}
+
+	if(u) /* update data and set value to return */
+	{	if(oper == VM_MMSET)
+			u->val = val;
+		else if(oper == VM_MMADD)
+			u->val = (Void_t*)((long)(u->val) + (long)(val));
+		val = u->val;
+	}
+	else	val = NIL(Void_t*);
+
+	CLRLOCK(vm, 0);
+
+	return val;
+}
+
+void vmmrelease(Vmalloc_t* vm, int type)
+{
+	Mmdisc_t	*mmdc = (Mmdisc_t*)vm->disc;
+
+	mmdc->flag |= MM_RELEASE;
+	if(type > 0)
+		mmdc->flag |= MM_CLEANUP;
+}
+
+/* suggest an address usable for mapping memory */
+Void_t* vmmaddress(size_t size)
+{
+#if !defined(_map_min) || !defined(_map_max) || !defined(_map_dir)
+	return NIL(Void_t*);
+#else
+	Void_t			*avail;
+	static Vmuchar_t	*min = (Vmuchar_t*)_map_min;
+	static Vmuchar_t	*max = (Vmuchar_t*)_map_max;
+
+	GETPAGESIZE(_Vmpagesize);
+	size = ROUND(size, _Vmpagesize);
+
+	if(_map_dir == 0 || (min+size) > max)
+		avail = NIL(Void_t*);
+	else if(_map_dir > 0)
+	{	avail = (Void_t*)min;
+		min += size;
+	}
+	else 
+	{	max -= size;
+		avail = (Void_t*)max;
+	}
+
+	return avail;
+#endif
+}
+
+#endif