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authorLaurent Bercot <ska-skaware@skarnet.org>2021-06-29 12:23:00 +0000
committerLaurent Bercot <ska@appnovation.com>2021-06-29 12:23:00 +0000
commite0bc74ff013a3628b17911be624d17067259c07b (patch)
tree15c09e28a4752288c992ca89301aad7309f4e37c /src/libstddjb/cdb_init.c
parentf602d80a10b4d62a8090af8c8b6b8fe17c9ea8a8 (diff)
downloadskalibs-e0bc74ff013a3628b17911be624d17067259c07b.tar.xz
cdb always mmaps
Signed-off-by: Laurent Bercot <ska@appnovation.com>
Diffstat (limited to 'src/libstddjb/cdb_init.c')
-rw-r--r--src/libstddjb/cdb_init.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/src/libstddjb/cdb_init.c b/src/libstddjb/cdb_init.c
new file mode 100644
index 0000000..2a1ffb3
--- /dev/null
+++ b/src/libstddjb/cdb_init.c
@@ -0,0 +1,23 @@
+/* ISC license. */
+
+#include <skalibs/bsdsnowflake.h>
+
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <skalibs/cdb.h>
+
+int cdb_init (struct cdb *c, int fd)
+{
+ struct stat st ;
+ char *map ;
+ if (fstat(fd, &st) < 0) return -1 ;
+ if (st.st_size > UINT32_MAX) return (errno = EOVERFLOW, -1) ;
+ map = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, -1) ;
+ if (map == MAP_FAILED) return -1 ;
+ c->map = map ;
+ c->size = st.st_size ;
+ return 0 ;
+}