hpux.c

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/*-------------------------------------------------------------------------
 *
 * dynloader.c
 *    dynamic loader for HP-UX using the shared library mechanism
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    src/backend/port/dynloader/hpux.c
 *
 *  NOTES
 *      all functions are defined here -- it's impossible to trace the
 *      shl_* routines from the bundled HP-UX debugger.
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

/* System includes */
#include <a.out.h>
#include <dl.h>

#include "dynloader.h"
#include "utils/dynamic_loader.h"

void *
pg_dlopen(char *filename)
{
    /*
     * Use BIND_IMMEDIATE so that undefined symbols cause a failure return
     * from shl_load(), rather than an abort() later on when we attempt to
     * call the library!
     */
    shl_t       handle = shl_load(filename,
                                BIND_IMMEDIATE | BIND_VERBOSE | DYNAMIC_PATH,
                                  0L);

    return (void *) handle;
}

PGFunction
pg_dlsym(void *handle, char *funcname)
{
    PGFunction  f;

    if (shl_findsym((shl_t *) & handle, funcname, TYPE_PROCEDURE, &f) == -1)
        f = (PGFunction) NULL;
    return f;
}

void
pg_dlclose(void *handle)
{
    shl_unload((shl_t) handle);
}

char *
pg_dlerror(void)
{
    static char errmsg[] = "shl_load failed";

    if (errno)
        return strerror(errno);

    return errmsg;
}