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tools lib bpf: Add libbpf_get_error()

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This function will turn a libbpf pointer into a standard error code (or
0 if the pointer is valid).

This also allows removal of the dependency on linux/err.h in the public
header file, which causes problems in userspace programs built against
libbpf.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20170123011128.26534-5-joe@ovn.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Joe Stringer 2017-01-22 17:11:25 -08:00 • committed by Arnaldo Carvalho de Melo
parent 7803ba7309
commit e28ff1a838
3 changed files with 12 additions and 2 deletions
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8
tools/lib/bpf/libbpf.c
View file

@ -28,6 +28,7 @@
#include <fcntl.h>
#include <errno.h>
#include <asm/unistd.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/bpf.h>
#include <linux/list.h>
@ -1542,3 +1543,10 @@ bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset)
}
return ERR_PTR(-ENOENT);
}
long libbpf_get_error(const void *ptr)
{
if (IS_ERR(ptr))
return PTR_ERR(ptr);
return 0;
}