summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorEmil Velikov <emil.l.velikov@gmail.com>2014-09-07 19:29:00 +0100
committerEmil Velikov <emil.l.velikov@gmail.com>2014-09-28 17:09:34 +0100
commit4c2766b69c261703c62131b5e4200d0e164b5eb4 (patch)
tree5024abf8c56616b84a1ce93da2ee61b20207822b
parent268dce4192125ceb6a65f1c8d885e4b656310578 (diff)
Add private mmap/munmap wrappers
Unlike Linux, Android (bionic) has separate functions - mmap & mmap64. Add a local wrapper (inspired by gallium) that will be used throughout libdrm to combat this bionic feature. v2: - Drop the undefined unlikely macro. - Use macro for munmap under Android. - Wrap long lines. Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> (v1)
-rw-r--r--libdrm.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/libdrm.h b/libdrm.h
index 23926e6f..acfada5c 100644
--- a/libdrm.h
+++ b/libdrm.h
@@ -31,4 +31,59 @@
# define drm_public
#endif
+
+/**
+ * Static (compile-time) assertion.
+ * Basically, use COND to dimension an array. If COND is false/zero the
+ * array size will be -1 and we'll get a compilation error.
+ */
+#define STATIC_ASSERT(COND) \
+ do { \
+ (void) sizeof(char [1 - 2*!(COND)]); \
+ } while (0)
+
+
+#include <sys/mman.h>
+
+#if defined(ANDROID)
+#include <errno.h> /* for EINVAL */
+
+extern void *__mmap2(void *, size_t, int, int, int, size_t);
+
+static inline void *drm_mmap(void *addr, size_t length, int prot, int flags,
+ int fd, loff_t offset)
+{
+ /* offset must be aligned to 4096 (not necessarily the page size) */
+ if (offset & 4095) {
+ errno = EINVAL;
+ return MAP_FAILED;
+ }
+
+ return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
+}
+
+# define drm_munmap(addr, length) \
+ munmap(addr, length)
+
+
+#else
+
+/* assume large file support exists */
+# define drm_mmap(addr, length, prot, flags, fd, offset) \
+ mmap(addr, length, prot, flags, fd, offset)
+
+
+static inline int drm_munmap(void *addr, size_t length)
+{
+ /* Copied from configure code generated by AC_SYS_LARGEFILE */
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
+ (((off_t) 1 << 31) << 31))
+ STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
+ LARGE_OFF_T % 2147483647 == 1);
+#undef LARGE_OFF_T
+
+ return munmap(addr, length);
+}
+#endif
+
#endif