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libbb: create and use mmap() helpers

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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
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(add/remove: 3/0 grow/shrink: 0/3 up/down: 59/-63)             Total: -4 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2020-12-14 18:25:28 +01:00
parent db793480cb
commit fd3c512f88
6 changed files with 28 additions and 12 deletions
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2
archival/rpm.c
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@@ -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);