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authorSimo Sorce <idra@samba.org>2011-08-14 18:05:27 -0400
committerSimo Sorce <idra@samba.org>2011-08-14 19:51:45 -0400
commita171938408adde0d787b9ff40a4cebeee66d747a (patch)
tree57bd82d7211d00d14475e19e905c520101e2697e
parent88ecf1a9b8032669e097cca448c0640d1453a234 (diff)
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replace: Check if we have mremap() available
-rw-r--r--lib/replace/libreplace.m47
-rw-r--r--lib/replace/test/shared_mremap.c48
2 files changed, 55 insertions, 0 deletions
diff --git a/lib/replace/libreplace.m4 b/lib/replace/libreplace.m4
index 808d5d1c06..d644e5062e 100644
--- a/lib/replace/libreplace.m4
+++ b/lib/replace/libreplace.m4
@@ -98,6 +98,13 @@ if test x"$libreplace_cv_HAVE_MMAP" = x"yes"; then
AC_DEFINE(HAVE_MMAP,1,[Whether mmap works])
fi
+AC_CACHE_CHECK([for working mremap],libreplace_cv_HAVE_MREMAP,[
+AC_TRY_RUN([#include "$libreplacedir/test/shared_mremap.c"],
+ libreplace_cv_HAVE_MREMAP=yes,libreplace_cv_HAVE_MREMAP=no,libreplace_cv_HAVE_MREMAP=cross)])
+if test x"$libreplace_cv_HAVE_MREMAP" = x"yes"; then
+ AC_DEFINE(HAVE_MREMAP,1,[Whether mremap works])
+fi
+
AC_CHECK_HEADERS(sys/syslog.h syslog.h)
AC_CHECK_HEADERS(sys/time.h time.h)
diff --git a/lib/replace/test/shared_mremap.c b/lib/replace/test/shared_mremap.c
new file mode 100644
index 0000000000..05032ad12e
--- /dev/null
+++ b/lib/replace/test/shared_mremap.c
@@ -0,0 +1,48 @@
+/* this tests whether we can use mremap */
+
+#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
+
+#ifndef MAP_FAILED
+#define MAP_FAILED (int *)-1
+#endif
+
+main()
+{
+ int *buf;
+ int fd;
+ int err = 1;
+
+ fd = open(DATA, O_RDWR|O_CREAT|O_TRUNC, 0666);
+ if (fd == -1) {
+ exit(1);
+ }
+
+ buf = (int *)mmap(NULL, 0x1000, PROT_READ | PROT_WRITE,
+ MAP_FILE | MAP_SHARED, fd, 0);
+ if (buf == MAP_FAILED) {
+ goto done;
+ }
+
+ buf = mremap(buf, 0x1000, 0x2000, MREMAP_MAYMOVE);
+ if (buf == MAP_FAILED) {
+ goto done;
+ }
+
+ err = 0;
+done:
+ close(fd);
+ unlink(DATA);
+ exit(err);
+}