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/* Tests for loading and unloading of iconv modules.
Copyright (C) 2000-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<>. */
#include <iconv.h>
#include <mcheck.h>
#include <stdio.h>
#include <stdlib.h>
/* How many load/unload operations do we do. */
#define TEST_ROUNDS 5000
enum state { unloaded, loaded };
const char *name;
enum state state;
iconv_t cd;
} modules[] =
#define MODULE(Name) { .name = #Name, .state = unloaded }
MODULE (ISO-8859-1),
MODULE (ISO-8859-2),
MODULE (ISO-8859-3),
MODULE (ISO-8859-4),
MODULE (ISO-8859-5),
MODULE (ISO-8859-6),
MODULE (ISO-8859-15),
#define nmodules (sizeof (modules) / sizeof (modules[0]))
/* The test data. */
static const char inbuf[] =
"The first step is the function to create a handle.\n"
" - Function: iconv_t iconv_open (const char *TOCODE, const char\n"
" The `iconv_open' function has to be used before starting a\n"
" conversion. The two parameters this function takes determine the\n"
" source and destination character set for the conversion and if the\n"
" implementation has the possibility to perform such a conversion the\n"
" function returns a handle.\n"
" If the wanted conversion is not available the function returns\n"
" `(iconv_t) -1'. In this case the global variable `errno' can have\n"
" the following values:\n"
" `EMFILE'\n"
" The process already has `OPEN_MAX' file descriptors open.\n"
" `ENFILE'\n"
" The system limit of open file is reached.\n"
" `ENOMEM'\n"
" Not enough memory to carry out the operation.\n"
" `EINVAL'\n"
" The conversion from FROMCODE to TOCODE is not supported.\n"
" It is not possible to use the same descriptor in different threads\n"
" to perform independent conversions. Within the data structures\n"
" associated with the descriptor there is information about the\n"
" conversion state. This must not be messed up by using it in\n"
" different conversions.\n"
" An `iconv' descriptor is like a file descriptor as for every use a\n"
" new descriptor must be created. The descriptor does not stand for\n"
" all of the conversions from FROMSET to TOSET.\n"
" The GNU C library implementation of `iconv_open' has one\n"
" significant extension to other implementations. To ease the\n"
" extension of the set of available conversions the implementation\n"
" allows storing the necessary files with data and code in\n"
" arbitrarily many directories. How this extension has to be\n"
" written will be explained below (*note glibc iconv\n"
" Implementation::). Here it is only important to say that all\n"
" directories mentioned in the `GCONV_PATH' environment variable are\n"
" considered if they contain a file `gconv-modules'. These\n"
" directories need not necessarily be created by the system\n"
" administrator. In fact, this extension is introduced to help users\n"
" writing and using their own, new conversions. Of course this does\n"
" not work for security reasons in SUID binaries; in this case only\n"
" the system directory is considered and this normally is\n"
" `PREFIX/lib/gconv'. The `GCONV_PATH' environment variable is\n"
" examined exactly once at the first call of the `iconv_open'\n"
" function. Later modifications of the variable have no effect.\n";
main (void)
size_t count = TEST_ROUNDS;
int result = 0;
mtrace ();
/* Just a seed. */
srandom (TEST_ROUNDS);
while (count--)
int idx = random () % nmodules;
if (modules[idx].state == unloaded)
char outbuf[10000];
char *inptr = (char *) inbuf;
size_t insize = sizeof (inbuf) - 1;
char *outptr = outbuf;
size_t outsize = sizeof (outbuf);
/* Load the module and do the conversion. */
modules[idx].cd = iconv_open ("UTF-8", modules[idx].name);
if (modules[idx].cd == (iconv_t) -1)
printf ("opening of %s failed: %m\n", modules[idx].name);
result = 1;
modules[idx].state = loaded;
/* Now a simple test. */
if (iconv (modules[idx].cd, &inptr, &insize, &outptr, &outsize) != 0
|| *inptr != '\0')
printf ("conversion with %s failed\n", modules[idx].name);
result = 1;
/* Unload the module. */
if (iconv_close (modules[idx].cd) != 0)
printf ("closing of %s failed: %m\n", modules[idx].name);
result = 1;
modules[idx].state = unloaded;
for (count = 0; count < nmodules; ++count)
if (modules[count].state == loaded && iconv_close (modules[count].cd) != 0)
printf ("closing of %s failed: %m\n", modules[count].name);
result = 1;
return result;