diff options
| -rw-r--r-- | source4/lib/replace/libreplace.m4 | 10 | ||||
| -rw-r--r-- | source4/lib/replace/test/shared_mmap.c | 68 |
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); +} |