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/* gen-posix-lock-obj.c - Build tool to construct the lock object.
Copyright (C) 2014 g10 Code GmbH
This file is part of libgpg-error.
libgpg-error 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.
libgpg-error 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_W32_SYSTEM
# error This module may not be build for Windows.
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#ifdef USE_POSIX_THREADS
# include <pthread.h>
#endif
#include "posix-lock-obj.h"
#define PGM "gen-posix-lock-obj"
/* Check that configure did its job. */
#ifdef USE_POSIX_THREADS
#if SIZEOF_PTHREAD_MUTEX_T < 4
# error sizeof pthread_mutex_t is not known.
#endif
#endif
/* Special requirements for certain platforms. */
# define USE_LONG_DOUBLE_FOR_ALIGNMENT 0
#if defined(__sun) && !defined (__LP64__) && !defined(_LP64)
/* Solaris on 32-bit architecture. */
# define USE_DOUBLE_FOR_ALIGNMENT 1
#else
# define USE_DOUBLE_FOR_ALIGNMENT 0
#endif
#if defined(__hppa__)
# define USE_16BYTE_ALIGNMENT 1
#else
# define USE_16BYTE_ALIGNMENT 0
#endif
#if USE_16BYTE_ALIGNMENT && !HAVE_GCC_ATTRIBUTE_ALIGNED
# error compiler is not able to enforce a 16 byte alignment
#endif
#ifdef USE_POSIX_THREADS
static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
#endif
int
main (void)
{
#ifdef USE_POSIX_THREADS
unsigned char *p;
int i;
#endif
struct {
long vers;
#ifdef USE_POSIX_THREADS
pthread_mutex_t mtx;
#endif
} dummyobj;
#ifdef USE_POSIX_THREADS
if (sizeof mtx != SIZEOF_PTHREAD_MUTEX_T)
{
fprintf (stderr, PGM ": pthread_mutex_t mismatch\n");
exit (1);
}
#endif /*USE_POSIX_THREADS*/
if (sizeof (dummyobj) != sizeof (_gpgrt_lock_t))
{
fprintf (stderr, PGM ": internal and external lock object mismatch\n");
exit (1);
}
printf ("## lock-obj-pub.%s.h%s\n"
"## File created by " PGM " - DO NOT EDIT\n"
"## To be included by mkheader into gpg-error.h\n"
"\n",
HOST_TRIPLET_STRING,
#ifdef USE_POSIX_THREADS
""
#else
" - NO LOCK SUPPORT"
#endif
);
#ifdef USE_POSIX_THREADS
/* To force a probably suitable alignment of the structure we use a
union and include a long and a pointer to a long. */
printf ("typedef struct\n"
"{\n"
" long _vers;\n"
" union {\n"
" volatile char _priv[%d];\n"
"%s"
" long _x_align;\n"
" long *_xp_align;\n"
" } u;\n"
"} gpgrt_lock_t;\n"
"\n"
"#define GPGRT_LOCK_INITIALIZER {%d,{{",
SIZEOF_PTHREAD_MUTEX_T,
# if USE_16BYTE_ALIGNMENT
" int _x16_align __attribute__ ((aligned (16)));\n",
# elif USE_DOUBLE_FOR_ALIGNMENT
" double _xd_align;\n",
# elif USE_LONG_DOUBLE_FOR_ALIGNMENT
" long double _xld_align;\n",
# else
"",
# endif
LOCK_ABI_VERSION);
p = (unsigned char *)&mtx;
for (i=0; i < sizeof mtx; i++)
{
if (i && !(i % 8))
printf (" \\\n%*s", 36, "");
printf ("%u", p[i]);
if (i < sizeof mtx - 1)
putchar (',');
}
fputs ("}}}\n", stdout);
#else /*!USE_POSIX_THREADS*/
printf ("/* Dummy object - no locking available. */\n"
"typedef struct\n"
"{\n"
" long _vers;\n"
"} gpgrt_lock_t;\n"
"\n"
"#define GPGRT_LOCK_INITIALIZER {%d}\n",
LOCK_ABI_VERSION);
#endif /*!USE_POSIX_THREADS*/
fputs ("##\n"
"## Loc" "al Variables:\n"
"## mode: c\n"
"## buffer-read-only: t\n"
"## End:\n"
"##\n", stdout);
if (ferror (stdout))
{
fprintf (stderr, PGM ": error writing to stdout: %s\n", strerror (errno));
return 1;
}
return 0;
}