diff options
Diffstat (limited to 'src/backend/port/dynloader')
| -rw-r--r-- | src/backend/port/dynloader/ultrix4.c | 75 | ||||
| -rw-r--r-- | src/backend/port/dynloader/ultrix4.h | 123 |
2 files changed, 198 insertions, 0 deletions
diff --git a/src/backend/port/dynloader/ultrix4.c b/src/backend/port/dynloader/ultrix4.c new file mode 100644 index 0000000000..7d1d493c2b --- /dev/null +++ b/src/backend/port/dynloader/ultrix4.c @@ -0,0 +1,75 @@ +/*------------------------------------------------------------------------- + * + * dynloader.c-- + * This dynamic loader uses Andrew Yu's libdl-1.0 package for Ultrix 4.x. + * (Note that pg_dlsym and pg_dlclose are actually macros defined in + * "port-protos.h".) + * + * Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * $Header: /cvsroot/pgsql/src/backend/port/dynloader/ultrix4.c,v 1.1 1998/03/10 05:23:40 scrappy Exp $ + * + *------------------------------------------------------------------------- + */ +#include <stdio.h> +#include <postgres.h> +#include "dl.h" +#include <utils/dynamic_loader.h> +#include "c.h" +#include "fmgr.h" +#include "port-protos.h" +#include "utils/elog.h" + +extern char pg_pathname[]; + +void * +pg_dlopen(char *filename) +{ + static int dl_initialized = 0; + void *handle; + + /* + * initializes the dynamic loader with the executable's pathname. + * (only needs to do this the first time pg_dlopen is called.) + */ + if (!dl_initialized) + { + if (!dl_init(pg_pathname)) + { + return NULL; + } + + /* + * if there are undefined symbols, we want dl to search from the + * following libraries also. + */ + dl_setLibraries("/usr/lib/libm_G0.a:/usr/lib/libc_G0.a"); + dl_initialized = 1; + } + + /* + * open the file. We do the symbol resolution right away so that we + * will know if there are undefined symbols. (This is in fact the same + * semantics as "ld -A". ie. you cannot have undefined symbols. + */ + if ((handle = dl_open(filename, DL_NOW)) == NULL) + { + int count; + char **list = dl_undefinedSymbols(&count); + + /* list the undefined symbols, if any */ + if (count) + { + elog(NOTICE, "dl: Undefined:"); + while (*list) + { + elog(NOTICE, " %s", *list); + list++; + } + } + } + + return (void *) handle; +} diff --git a/src/backend/port/dynloader/ultrix4.h b/src/backend/port/dynloader/ultrix4.h new file mode 100644 index 0000000000..47bb5e3339 --- /dev/null +++ b/src/backend/port/dynloader/ultrix4.h @@ -0,0 +1,123 @@ +/*------------------------------------------------------------------------- + * + * dl.h-- + * + * + * + * Copyright (c) 1994, Regents of the University of California + * + * $Id: ultrix4.h,v 1.1 1998/03/10 05:23:46 scrappy Exp $ + * + *------------------------------------------------------------------------- + */ +/* + * Ultrix 4.x Dynamic Loader Library Version 1.0 + * + * dl.h-- + * header file for the Dynamic Loader Library + * + * + * Copyright (c) 1993 Andrew K. Yu, University of California at Berkeley + * All rights reserved. + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for educational, research, and non-profit purposes and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation. Permission + * to incorporate this software into commercial products can be obtained + * from the author. The University of California and the author make + * no representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + */ +#ifndef _DL_HEADER_ +#define _DL_HEADER_ + +#include <stdio.h> /* needed to declare FILE for ldfcn.h */ +#include <filehdr.h> +#include <syms.h> +#include <ldfcn.h> +#include <reloc.h> +#include <scnhdr.h> + + +typedef long CoreAddr; + + +typedef struct ScnInfo +{ + CoreAddr addr; /* starting address of the section */ + SCNHDR hdr; /* section header */ + RELOC *relocEntries; /* relocation entries */ +} ScnInfo; + +typedef enum +{ + DL_NEEDRELOC, /* still need relocation */ + DL_RELOCATED, /* no relocation necessary */ + DL_INPROG /* relocation in progress */ +} dlRStatus; + +typedef struct JmpTbl +{ + char *block; /* the jump table memory block */ + struct JmpTbl *next; /* next block */ +} JmpTbl; + +typedef struct dlFile +{ + char *filename; /* file name of the object file */ + + int textSize; /* used by mprotect */ + CoreAddr textAddress; /* start addr of text section */ + long textVaddr; /* vaddr of text section in obj file */ + CoreAddr rdataAddress; /* start addr of rdata section */ + long rdataVaddr; /* vaddr of text section in obj file */ + CoreAddr dataAddress; /* start addr of data section */ + long dataVaddr; /* vaddr of text section in obj file */ + CoreAddr bssAddress; /* start addr of bss section */ + long bssVaddr; /* vaddr of text section in obj file */ + + int nsect; /* number of sections */ + ScnInfo *sect; /* details of each section (array) */ + + int issExtMax; /* size of string space */ + char *extss; /* extern sym string space (in core) */ + int iextMax; /* maximum number of Symbols */ + pEXTR extsyms; /* extern syms */ + + dlRStatus relocStatus; /* what relocation needed? */ + int needReloc; + + JmpTbl *jmptable; /* the jump table for R_JMPADDR */ + + struct dlFile *next; /* next member of the archive */ +} dlFile; + +typedef struct dlSymbol +{ + char *name; /* name of the symbol */ + long addr; /* address of the symbol */ + dlFile *objFile; /* from which file */ +} dlSymbol; + +/* + * prototypes for the dl* interface + */ +extern void *dl_open( /* char *filename, int mode */ ); +extern void *dl_sym( /* void *handle, char *name */ ); +extern void dl_close( /* void *handle */ ); +extern char *dl_error( /* void */ ); + +#define DL_LAZY 0 /* lazy resolution */ +#define DL_NOW 1 /* immediate resolution */ + +/* + * Miscellaneous utility routines: + */ +extern char **dl_undefinedSymbols( /* int *count */ ); +extern void dl_printAllSymbols( /* void *handle */ ); +extern void dl_setLibraries( /* char *libs */ ); + +#endif /* _DL_HEADER_ */ |