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authorAndrew Tridgell <tridge@samba.org>2006-09-10 11:47:21 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 14:18:10 -0500
commitfc8960ee9aec25db398d2ed4df124484f70abcfb (patch)
treed3e197a6e899964f3467453ab5d20309239bfc5f
parent0ee52751f3fba0fc73360696bb15ece0a10f64b7 (diff)
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r18332: added back in our shared mmap test code
(This used to be commit 6ff100b26698a50ba79b587a687cc0d440f73b55)
-rw-r--r--source4/lib/replace/libreplace.m410
-rw-r--r--source4/lib/replace/test/shared_mmap.c68
2 files changed, 77 insertions, 1 deletions
diff --git a/source4/lib/replace/libreplace.m4 b/source4/lib/replace/libreplace.m4
index 6c8c01d687..cd9d171662 100644
--- a/source4/lib/replace/libreplace.m4
+++ b/source4/lib/replace/libreplace.m4
@@ -42,7 +42,6 @@ AC_HEADER_STDC
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)
@@ -83,9 +82,18 @@ AC_INCLUDES_DEFAULT
)
+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
diff --git a/source4/lib/replace/test/shared_mmap.c b/source4/lib/replace/test/shared_mmap.c
new file mode 100644
index 0000000000..50dad8d696
--- /dev/null
+++ b/source4/lib/replace/test/shared_mmap.c
@@ -0,0 +1,68 @@
+/* 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);
+}