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68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* ultrix4.c
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* This dynamic loader uses Andrew Yu's libdl-1.0 package for Ultrix 4.x.
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/port/dynloader/ultrix4.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "dl.h"
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#include "utils/dynamic_loader.h"
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extern char my_exec_path[];
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void *
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pg_dlopen(char *filename)
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{
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static int dl_initialized = 0;
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void *handle;
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/*
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* initializes the dynamic loader with the executable's pathname. (only
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* needs to do this the first time pg_dlopen is called.)
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*/
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if (!dl_initialized)
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{
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if (!dl_init(my_exec_path))
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return NULL;
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/*
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* if there are undefined symbols, we want dl to search from the
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* following libraries also.
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*/
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dl_setLibraries("/usr/lib/libm_G0.a:/usr/lib/libc_G0.a");
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dl_initialized = 1;
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}
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/*
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* open the file. We do the symbol resolution right away so that we will
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* know if there are undefined symbols. (This is in fact the same
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* semantics as "ld -A". ie. you cannot have undefined symbols.
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*/
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if ((handle = dl_open(filename, DL_NOW)) == NULL)
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{
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int count;
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char **list = dl_undefinedSymbols(&count);
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/* list the undefined symbols, if any */
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if (count)
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{
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while (*list)
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{
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elog(WARNING, "\"%s\" is undefined", *list);
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list++;
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}
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}
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}
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return (void *) handle;
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}
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