libbpf: preserve errno before calling into user callback
pr_warning ultimately may call into user-provided callback function, which can clobber errno value, so we need to save it before that. Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -565,12 +565,12 @@ static int bpf_object__elf_init(struct bpf_object *obj)
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} else {
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obj->efile.fd = open(obj->path, O_RDONLY);
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if (obj->efile.fd < 0) {
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char errmsg[STRERR_BUFSIZE];
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char *cp = libbpf_strerror_r(errno, errmsg,
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sizeof(errmsg));
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char errmsg[STRERR_BUFSIZE], *cp;
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err = -errno;
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cp = libbpf_strerror_r(err, errmsg, sizeof(errmsg));
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pr_warning("failed to open %s: %s\n", obj->path, cp);
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return -errno;
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return err;
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}
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obj->efile.elf = elf_begin(obj->efile.fd,
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