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tools lib bpf: Add libbpf_get_error()
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>
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@ -28,6 +28,7 @@
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#include <fcntl.h>
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#include <errno.h>
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#include <asm/unistd.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/bpf.h>
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#include <linux/list.h>
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@ -1542,3 +1543,10 @@ bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset)
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}
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return ERR_PTR(-ENOENT);
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}
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long libbpf_get_error(const void *ptr)
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{
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if (IS_ERR(ptr))
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return PTR_ERR(ptr);
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return 0;
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}
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@ -22,8 +22,8 @@
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#define __BPF_LIBBPF_H
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <linux/err.h>
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#include <sys/types.h> // for size_t
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enum libbpf_errno {
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@ -234,4 +234,6 @@ int bpf_map__set_priv(struct bpf_map *map, void *priv,
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bpf_map_clear_priv_t clear_priv);
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void *bpf_map__priv(struct bpf_map *map);
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long libbpf_get_error(const void *ptr);
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#endif
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@ -13,7 +13,7 @@ static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
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struct bpf_object *obj;
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obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
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if (IS_ERR(obj))
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if (libbpf_get_error(obj))
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return TEST_FAIL;
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bpf_object__close(obj);
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return TEST_OK;
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