AC_CHECK_SIZEOF(off_t,cross)
AC_CHECK_SIZEOF(size_t,cross)
AC_CHECK_SIZEOF(ssize_t,cross)
-AC_FUNC_MMAP
AC_CHECK_HEADERS([stdint.h inttypes.h])
AC_CHECK_TYPE(uint_t, unsigned int)
)
+AC_CACHE_CHECK([for working mmap],samba_cv_HAVE_MMAP,[
+AC_TRY_RUN([#include "$libreplacedir/test/shared_mmap.c"],
+ samba_cv_HAVE_MMAP=yes,samba_cv_HAVE_MMAP=no,samba_cv_HAVE_MMAP=cross)])
+if test x"$samba_cv_HAVE_MMAP" = x"yes"; then
+ AC_DEFINE(HAVE_MMAP,1,[Whether mmap works])
+fi
+
+
AC_CACHE_CHECK([for broken inet_ntoa],samba_cv_REPLACE_INET_NTOA,[
AC_TRY_RUN([
#include <stdio.h>
+#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#ifdef HAVE_ARPA_INET_H
--- /dev/null
+/* this tests whether we can use a shared writeable mmap on a file -
+ as needed for the mmap variant of FAST_SHARE_MODES */
+
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define DATA "conftest.mmap"
+
+#ifndef MAP_FILE
+#define MAP_FILE 0
+#endif
+
+main()
+{
+ int *buf;
+ int i;
+ int fd = open(DATA,O_RDWR|O_CREAT|O_TRUNC,0666);
+ int count=7;
+
+ if (fd == -1) exit(1);
+
+ for (i=0;i<10000;i++) {
+ write(fd,&i,sizeof(i));
+ }
+
+ close(fd);
+
+ if (fork() == 0) {
+ fd = open(DATA,O_RDWR);
+ if (fd == -1) exit(1);
+
+ buf = (int *)mmap(NULL, 10000*sizeof(int),
+ (PROT_READ | PROT_WRITE),
+ MAP_FILE | MAP_SHARED,
+ fd, 0);
+
+ while (count-- && buf[9124] != 55732) sleep(1);
+
+ if (count <= 0) exit(1);
+
+ buf[1763] = 7268;
+ exit(0);
+ }
+
+ fd = open(DATA,O_RDWR);
+ if (fd == -1) exit(1);
+
+ buf = (int *)mmap(NULL, 10000*sizeof(int),
+ (PROT_READ | PROT_WRITE),
+ MAP_FILE | MAP_SHARED,
+ fd, 0);
+
+ if (buf == (int *)-1) exit(1);
+
+ buf[9124] = 55732;
+
+ while (count-- && buf[1763] != 7268) sleep(1);
+
+ unlink(DATA);
+
+ if (count > 0) exit(0);
+ exit(1);
+}