From fd3c512f88d43e6633bd3c3110cfa0bb321adaa8 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Mon, 14 Dec 2020 18:25:28 +0100 Subject: 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 --- libbb/xfuncs_printf.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'libbb/xfuncs_printf.c') diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c index fcc798662..db40e996b 100644 --- a/libbb/xfuncs_printf.c +++ b/libbb/xfuncs_printf.c @@ -111,6 +111,27 @@ void* FAST_FUNC xmemdup(const void *s, int n) return memcpy(xmalloc(n), s, n); } +void* FAST_FUNC mmap_read(int fd, size_t size) +{ + return mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); +} + +void* FAST_FUNC mmap_anon(size_t size) +{ + return mmap(NULL, size, + PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, + /* ignored: */ -1, 0); +} + +void* FAST_FUNC xmmap_anon(size_t size) +{ + void *p = mmap_anon(size); + if (p == MAP_FAILED) + bb_die_memory_exhausted(); + return p; +} + // Die if we can't open a file and return a FILE* to it. // Notice we haven't got xfread(), This is for use with fscanf() and friends. FILE* FAST_FUNC xfopen(const char *path, const char *mode) -- cgit v1.2.3