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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
modutils/modutils.c
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@ -169,7 +169,7 @@ void* FAST_FUNC try_to_mmap_module(const char *filename, size_t *image_size_p)
/* st.st_size is off_t, we can't just pass it to mmap */
if (st.st_size <= *image_size_p) {
size_t image_size = st.st_size;
image = mmap(NULL, image_size, PROT_READ, MAP_PRIVATE, fd, 0);
image = mmap_read(fd, image_size);
if (image == MAP_FAILED) {
image = NULL;
} else if (*(uint32_t*)image != SWAP_BE32(0x7f454C46)) {