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libbpf: Remove any use of reallocarray() in libbpf

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Re-implement glibc's reallocarray() for libbpf internal-only use.
reallocarray(), unfortunately, is not available in all versions of glibc, so
requires extra feature detection and using reallocarray() stub from
<tools/libc_compat.h> and COMPAT_NEED_REALLOCARRAY. All this complicates build
of libbpf unnecessarily and is just a maintenance burden. Instead, it's
trivial to implement libbpf-specific internal version and use it throughout
libbpf.

Which is what this patch does, along with converting some realloc() uses that
should really have been reallocarray() in the first place.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200819013607.3607269-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-08-18 18:36:04 -07:00
committed by Alexei Starovoitov
parent 00b2e95325
commit 029258d7b2
6 changed files with 45 additions and 29 deletions
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5
tools/lib/bpf/ringbuf.c
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@@ -16,7 +16,6 @@
#include <asm/barrier.h>
#include <sys/mman.h>
#include <sys/epoll.h>
#include <tools/libc_compat.h>
#include "libbpf.h"
#include "libbpf_internal.h"
@@ -82,12 +81,12 @@ int ring_buffer__add(struct ring_buffer *rb, int map_fd,
return -EINVAL;
}
tmp = reallocarray(rb->rings, rb->ring_cnt + 1, sizeof(*rb->rings));
tmp = libbpf_reallocarray(rb->rings, rb->ring_cnt + 1, sizeof(*rb->rings));
if (!tmp)
return -ENOMEM;
rb->rings = tmp;
tmp = reallocarray(rb->events, rb->ring_cnt + 1, sizeof(*rb->events));
tmp = libbpf_reallocarray(rb->events, rb->ring_cnt + 1, sizeof(*rb->events));
if (!tmp)
return -ENOMEM;
rb->events = tmp;