On Tue, Jan 29, 2019 at 7:13 AM Magnus Karlsson
<magnus.karls...@intel.com> wrote:
>
> Move the pr_*() functions in libbpf.c to a common header file called
> libbpf_internal.h. This so that the later libbpf AF_XDP helper library
> code in xsk.c can use these printing functions too.
>
> Signed-off-by: Magnus Karlsson <magnus.karls...@intel.com>
> ---
> tools/lib/bpf/libbpf.c | 30 +-----------------------------
> tools/lib/bpf/libbpf_internal.h | 41
> +++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 42 insertions(+), 29 deletions(-)
> create mode 100644 tools/lib/bpf/libbpf_internal.h
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 2ccde17..1d7fe26 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -39,6 +39,7 @@
> #include <gelf.h>
>
> #include "libbpf.h"
> +#include "libbpf_internal.h"
> #include "bpf.h"
> #include "btf.h"
> #include "str_error.h"
> @@ -51,34 +52,6 @@
> #define BPF_FS_MAGIC 0xcafe4a11
> #endif
>
> -#define __printf(a, b) __attribute__((format(printf, a, b)))
> -
> -__printf(1, 2)
> -static int __base_pr(const char *format, ...)
> -{
> - va_list args;
> - int err;
> -
> - va_start(args, format);
> - err = vfprintf(stderr, format, args);
> - va_end(args);
> - return err;
> -}
> -
> -static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
> -static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
> -static __printf(1, 2) libbpf_print_fn_t __pr_debug;
> -
> -#define __pr(func, fmt, ...) \
> -do { \
> - if ((func)) \
> - (func)("libbpf: " fmt, ##__VA_ARGS__); \
> -} while (0)
> -
> -#define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
> -#define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__)
> -#define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__)
> -
> void libbpf_set_print(libbpf_print_fn_t warn,
> libbpf_print_fn_t info,
> libbpf_print_fn_t debug)
> @@ -96,7 +69,6 @@ void libbpf_set_print(libbpf_print_fn_t warn,
> goto out; \
> } while(0)
>
> -
> /* Copied from tools/perf/util/util.h */
> #ifndef zfree
> # define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
> diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
> new file mode 100644
> index 0000000..951c078
> --- /dev/null
> +++ b/tools/lib/bpf/libbpf_internal.h
> @@ -0,0 +1,41 @@
> +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
> +
> +/*
> + * Common internal libbpf functions and definitions.
> + *
> + * Copyright (C) 2013-2015 Alexei Starovoitov <a...@kernel.org>
> + * Copyright (C) 2015 Wang Nan <wangn...@huawei.com>
> + * Copyright (C) 2015 Huawei Inc.
> + */
> +#ifndef __LIBBPF_LIBBPF_INTERNAL_H
> +#define __LIBBPF_LIBBPF_INTERNAL_H
> +
> +#define __printf(a, b) __attribute__((format(printf, a, b)))
> +
> +__printf(1, 2)
> +static int __base_pr(const char *format, ...)
> +{
> + va_list args;
> + int err;
> +
> + va_start(args, format);
> + err = vfprintf(stderr, format, args);
> + va_end(args);
> + return err;
> +}
Hmm. This will introduce this static function into every .c file.
Maybe we could define a global function in libbpf.c like
libbpf_debug_pr(level, ...)
This function will be internal to the library and implemented in libbpf.c.
All files can call this function to print out the debug information
based on level?
> +
> +static __maybe_unused __printf(1, 2) libbpf_print_fn_t __pr_warning =
> __base_pr;
> +static __maybe_unused __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
> +static __maybe_unused __printf(1, 2) libbpf_print_fn_t __pr_debug;
> +
> +#define __pr(func, fmt, ...) \
> +do { \
> + if ((func)) \
> + (func)("libbpf: " fmt, ##__VA_ARGS__); \
> +} while (0)
> +
> +#define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
> +#define pr_info(fmt, ...) __pr(__pr_info, fmt, ##__VA_ARGS__)
> +#define pr_debug(fmt, ...) __pr(__pr_debug, fmt, ##__VA_ARGS__)
> +
> +#endif /* __LIBBPF_LIBBPF_INTERNAL_H */
> --
> 2.7.4
>
