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, 4 deletions

diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index d41fd10f0..7f9d92ea9 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -75,10 +75,7 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
                                 goto use_small_buf;
                         /* We want page-aligned buffer, just in case kernel is clever
                          * and can do page-aligned io more efficiently */
-                        buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
-                                        PROT_READ | PROT_WRITE,
-                                        MAP_PRIVATE | MAP_ANON,
-                                        /* ignored: */ -1, 0);
+                        buffer = mmap_anon(CONFIG_FEATURE_COPYBUF_KB * 1024);
                         buffer_size = CONFIG_FEATURE_COPYBUF_KB * 1024;
                         if (buffer == MAP_FAILED) {
  use_small_buf: