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replace: Check if we have mremap() available

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This commit is contained in:
Simo Sorce 2011-08-14 18:05:27 -04:00
parent 88ecf1a9b8
commit a171938408
2 changed files with 55 additions and 0 deletions
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7
lib/replace/libreplace.m4
View File

@ -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)

48
lib/replace/test/shared_mremap.c Normal file
View File

@ -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);
}