libbb: create and use mmap() helpers

function                                             old     new   delta
mmap_anon                                              -      22     +22
mmap_read                                              -      21     +21
xmmap_anon                                             -      16     +16
rpm_gettags                                          465     447     -18
bb_full_fd_action                                    498     480     -18
uevent_main                                          337     310     -27
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 0/3 up/down: 59/-63)             Total: -4 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/archival/rpm.c b/archival/rpm.c
index 68afba914..a4d850b46 100644
--- a/archival/rpm.c
+++ b/archival/rpm.c
@@ -145,7 +145,7 @@ static int rpm_gettags(const char *filename)
         /* remember size for munmap */
         G.mapsize = storepos;
         /* some NOMMU systems prefer MAP_PRIVATE over MAP_SHARED */
-        G.map = mmap(0, storepos, PROT_READ, MAP_PRIVATE, fd, 0);
+        G.map = mmap_read(fd, storepos);
         if (G.map == MAP_FAILED)
                 bb_perror_msg_and_die("mmap '%s'", filename);