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/* Loading dynamic objects for GNU Make.
Copyright (C) 2012 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3 of the License, or (at your option) any later
version.
GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>. */
#include "makeint.h"
#if MAKE_LOAD
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <errno.h>
#define SYMBOL_EXTENSION "_gmake_setup"
static void *global_dl = NULL;
#include "debug.h"
#include "filedef.h"
#include "variable.h"
static int
init_symbol (const struct floc *flocp, const char *ldname, load_func_t symp)
{
int r;
const char *p;
int nmlen = strlen (ldname);
char *loaded = allocated_variable_expand("$(.LOADED)");
/* If it's already been loaded don't do it again. */
p = strstr (loaded, ldname);
r = p && (p==loaded || p[-1]==' ') && (p[nmlen]=='\0' || p[nmlen]==' ');
free (loaded);
if (r)
return 1;
/* Now invoke the symbol. */
r = (*symp) (flocp);
/* If it succeeded, add the symbol to the loaded variable. */
if (r > 0)
do_variable_definition (flocp, ".LOADED", ldname, o_default, f_append, 0);
return r;
}
int
load_file (const struct floc *flocp, const char **ldname, int noerror)
{
load_func_t symp;
const char *fp;
char *symname = NULL;
char *new = alloca (strlen (*ldname) + CSTRLEN (SYMBOL_EXTENSION) + 1);
if (! global_dl)
{
global_dl = dlopen (NULL, RTLD_NOW|RTLD_GLOBAL);
if (! global_dl)
fatal (flocp, _("Failed to open global symbol table: %s"), dlerror());
}
/* If a symbol name was provided, use it. */
fp = strchr (*ldname, '(');
if (fp)
{
const char *ep;
/* There's an open paren, so see if there's a close paren: if so use
that as the symbol name. We can't have whitespace: it would have
been chopped up before this function is called. */
ep = strchr (fp+1, ')');
if (ep && ep[1] == '\0')
{
int l = fp - *ldname;;
++fp;
if (fp == ep)
fatal (flocp, _("Empty symbol name for load: %s"), *ldname);
/* Make a copy of the ldname part. */
memcpy (new, *ldname, l);
new[l] = '\0';
*ldname = new;
/* Make a copy of the symbol name part. */
symname = new + l + 1;
memcpy (symname, fp, ep - fp);
symname[ep - fp] = '\0';
}
}
/* Add this name to the string cache so it can be reused later. */
*ldname = strcache_add (*ldname);
/* If we didn't find a symbol name yet, construct it from the ldname. */
if (! symname)
{
char *p = new;
fp = strrchr (*ldname, '/');
if (!fp)
fp = *ldname;
else
++fp;
while (isalnum (*fp) || *fp == '_')
*(p++) = *(fp++);
strcpy (p, SYMBOL_EXTENSION);
symname = new;
}
DB (DB_VERBOSE, (_("Loading symbol %s from %s\n"), symname, *ldname));
/* See if it's already defined. */
symp = (load_func_t) dlsym (global_dl, symname);
if (! symp) {
void *dlp = NULL;
/* If the path has no "/", try the current directory first. */
if (! strchr (*ldname, '/'))
dlp = dlopen (concat (2, "./", *ldname), RTLD_LAZY|RTLD_GLOBAL);
/* If we haven't opened it yet, try the default search path. */
if (! dlp)
dlp = dlopen (*ldname, RTLD_LAZY|RTLD_GLOBAL);
/* Still no? Then fail. */
if (! dlp)
{
if (noerror)
DB (DB_BASIC, ("%s", dlerror()));
else
error (flocp, "%s", dlerror());
return 0;
}
symp = dlsym (dlp, symname);
if (! symp)
fatal (flocp, _("Failed to load symbol %s from %s: %s"),
symname, *ldname, dlerror());
}
/* Invoke the symbol to initialize the loaded object. */
return init_symbol(flocp, *ldname, symp);
}
#else
int
load_file (const struct floc *flocp, const char **ldname, int noerror)
{
if (! noerror)
fatal (flocp, _("The 'load' operation is not supported on this platform."));
return 0;
}
#endif /* MAKE_LOAD */
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