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https://github.com/JakeHillion/drgn.git
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c1a2792e6a
Exceptions aren't enough to debug complicated code paths like debug info discovery or stack unwinding. We really need logs for that, so let's add a small logging framework. By default, we log to stderr, but we also provide a way to direct logs to a different file, or even an arbitrary callback so that logs can be directed to the application's logging library of choice. Signed-off-by: Omar Sandoval <osandov@osandov.com>
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: LGPL-2.1-or-later
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#include <stdarg.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "log.h"
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#include "program.h"
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#include "util.h"
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LIBDRGN_PUBLIC void drgn_program_set_log_level(struct drgn_program *prog,
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int level)
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{
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prog->log_level = level;
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}
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LIBDRGN_PUBLIC int drgn_program_get_log_level(struct drgn_program *prog)
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{
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return prog->log_level;
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}
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static void drgn_file_log_fn(struct drgn_program *prog, void *arg,
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enum drgn_log_level level, const char *format,
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va_list ap, struct drgn_error *err)
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{
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FILE *file = arg;
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flockfile(file);
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static const char * const prefix[] = {
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[DRGN_LOG_DEBUG] = "debug: ",
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[DRGN_LOG_INFO] = "info: ",
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[DRGN_LOG_WARNING] = "warning: ",
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[DRGN_LOG_ERROR] = "error: ",
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[DRGN_LOG_CRITICAL] = "critical: ",
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};
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fputs(prefix[level], file);
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vfprintf(file, format, ap);
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if (err)
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drgn_error_fwrite(file, err);
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else
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putc('\n', file);
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funlockfile(file);
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}
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LIBDRGN_PUBLIC void drgn_program_set_log_file(struct drgn_program *prog,
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FILE *file)
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{
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drgn_program_set_log_callback(prog, drgn_file_log_fn, file);
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}
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LIBDRGN_PUBLIC void drgn_program_set_log_callback(struct drgn_program *prog,
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drgn_log_fn *callback,
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void *callback_arg)
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{
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prog->log_fn = callback;
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prog->log_arg = callback_arg;
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}
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LIBDRGN_PUBLIC void drgn_program_get_log_callback(struct drgn_program *prog,
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drgn_log_fn **callback_ret,
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void **callback_arg_ret)
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{
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*callback_ret = prog->log_fn;
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*callback_arg_ret = prog->log_arg;
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}
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bool drgn_log_is_enabled(struct drgn_program *prog, enum drgn_log_level level)
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{
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return level >= prog->log_level;
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}
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void drgn_error_log(enum drgn_log_level level, struct drgn_program *prog,
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struct drgn_error *err, const char *format, ...)
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{
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if (!drgn_log_is_enabled(prog, level))
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return;
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va_list ap;
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va_start(ap, format);
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prog->log_fn(prog, prog->log_arg, level, format, ap, err);
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va_end(ap);
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}
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