~louis/ubuntu/trusty/clamav/lp799623_fix_logrotate

dnl Check for mmap()

dnl AC_FUNC_MMAP checks for private fixed mappings, we don't need

dnl fixed mappings, so check only wether private mappings work.

dnl AC_FUNC_MMAP would fail on HP-UX for example.

AC_DEFUN([AC_C_FUNC_MMAP_PRIVATE],

[ 

	AC_CACHE_CHECK([for working mmap], [ac_cv_c_mmap_private],

	[

		AC_RUN_IFELSE([AC_LANG_SOURCE([

#include <unistd.h>

#include <stdlib.h>

#include <sys/mman.h>

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif

#include <fcntl.h> 

int main(void)

{

	char *data, *data2, *data3;

	unsigned i, datasize = 1024;

	int fd;

  	/* First, make a file with some known garbage in it. */

	data = (char*) malloc(datasize);

	if(!data)

		return 1;

	for(i=0;i<datasize;i++)

		*(data + i) = rand();

	umask(0);

	fd = creat("conftest.mmap", 0600);

	if(fd < 0)

		return 1;

	if(write (fd, data, datasize) != datasize)

		return 1;

	close(fd);

	fd = open("conftest.mmap", O_RDWR);

	if (fd < 0)

		return 1;

	/* Next, try to mmap the file at a fixed address which already has

	   something else allocated at it.  If we can, also make sure that

	   we see the same garbage.  */

	data2 = mmap(NULL, sizeof(data), PROT_READ | PROT_WRITE,

		MAP_PRIVATE, fd, 0L);	

	if(data2 == MAP_FAILED)

		return 2;

	for(i=0;i<sizeof(data);i++)

		if(*(data + i) != *(data2+ i))

			return 3;

	  /* Finally, make sure that changes to the mapped area do not

     	     percolate back to the file as seen by read().  (This is a bug on

             some variants of i386 svr4.0.)  */

	  for (i = 0; i < datasize; ++i)

	    *(data2 + i) = *(data2 + i) + 1;

	data3 = (char*) malloc(datasize);

	if(!data3)

		return 1;

	if(read (fd, data3, datasize) != datasize)

		return 1;

	for(i=0;i<sizeof(data);i++)

		if(*(data + i) != *(data3 + i))

			return 3;

	close(fd);

	return 0;

}])],

	[ac_cv_c_mmap_private=yes],

	[ac_cv_c_mmap_private=no],

	[ac_cv_c_mmap_private=no])])

if test $ac_cv_c_mmap_private = yes; then

	AC_DEFINE(HAVE_MMAP, 1,

		[Define to 1 if you have a working `mmap' system call that supports MAP_PRIVATE.])

fi

rm -f conftest.mmap

])

AC_DEFUN([AC_C_FUNC_MMAP_ANONYMOUS],

[

	AC_CACHE_CHECK([for MAP_ANON(YMOUS)], [ac_cv_c_mmap_anonymous],[

		ac_cv_c_mmap_anonymous='no'

		AC_LINK_IFELSE(

			[AC_LANG_PROGRAM([[#include <sys/mman.h>]], [[mmap((void *)0, 0, PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);]])],

			[ac_cv_c_mmap_anonymous='MAP_ANONYMOUS'],

			[

				AC_LINK_IFELSE(

					[AC_LANG_PROGRAM([[

/* OPENBSD WORKAROUND - DND*/

#include <sys/types.h>

/* OPENBSD WORKAROUND - END*/

#include <sys/mman.h>

]], [[mmap((void *)0, 0, PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);]])],

					[ac_cv_c_mmap_anonymous='MAP_ANON']

				)

			]

		)

	])

	if test "$ac_cv_c_mmap_anonymous" != "no"; then

		AC_DEFINE_UNQUOTED([ANONYMOUS_MAP],[$ac_cv_c_mmap_anonymous],[mmap flag for anonymous maps])

	fi

])

AC_DEFUN([AC_C_FUNC_PAGESIZE],

[

ac_cv_c_can_get_pagesize="no"

AC_CACHE_CHECK([for sysconf(_SC_PAGESIZE)], [ac_cv_c_sysconf_sc_pagesize], [

	AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <sys/types.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif]], [[int x = sysconf(_SC_PAGESIZE);]])],

	[ac_cv_c_sysconf_sc_pagesize=yes], [ac_cv_c_sysconf_sc_pagesize=no])

])

if test "$ac_cv_c_sysconf_sc_pagesize" = "yes"; then

	AC_DEFINE([HAVE_SYSCONF_SC_PAGESIZE], 1, [Define to 1 if sysconf(_SC_PAGESIZE) is available])

	ac_cv_c_can_get_pagesize="yes"

fi

AC_CACHE_CHECK([for getpagesize()], [ac_cv_c_getpagesize], [

	AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#if HAVE_UNISTD_H

#include <unistd.h>

#endif]], [[int x = getpagesize();]])], 

	[ac_cv_c_getpagesize=yes], [ac_cv_c_getpagesize=no])

])

if test "$ac_cv_c_getpagesize" = "yes"; then

	AC_DEFINE([HAVE_GETPAGESIZE], 1, [Define to 1 if getpagesize() is available])

	ac_cv_c_can_get_pagesize="yes"

fi

])