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system/nxinit: add CONFIG_SYSTEM_NXINIT_STDOUT for printf-based log output

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Syslog may be output via services such as DFX. When debugging the init
component (e.g., service startup failures, including DFX-related
exceptions), syslog may not be output properly.

Add a debug Kconfig option SYSTEM_NXINIT_STDOUT that redirects all init
log macros (init_debug/info/warn/err) to printf instead of syslog.
This is useful for early boot debugging when syslog is not yet
available or serial console shows no output.

Introduce init_log_output() macro as the common log backend, selected
at compile time between printf (with appended newline) and syslog.

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
This commit is contained in:
wangjianyu3 2026-03-10 12:58:24 +08:00 • committed by Alan C. Assis
parent 2968b2c587
commit c8ffe2a5e1
2 changed files with 19 additions and 4 deletions
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8
system/nxinit/Kconfig
View file

@ -182,4 +182,12 @@ config SYSTEM_NXINIT_DEBUG
bool "Enable debug log"
depends on SYSTEM_NXINIT_INFO
config SYSTEM_NXINIT_STDOUT
bool "Output log to stdout (printf)"
default n
---help---
Debug option: redirect all init logs to stdout via printf
instead of syslog. Useful when syslog is not available or
serial console has no output during early boot.
endif

15
system/nxinit/init.h
View file

@ -28,6 +28,7 @@
****************************************************************************/
#include <poll.h>
#include <stdio.h>
#include <syslog.h>
/****************************************************************************
@ -36,8 +37,14 @@
#define TIMESPEC2MS(t) (((t).tv_sec * 1000) + (t).tv_nsec / 1000000)
#ifdef CONFIG_SYSTEM_NXINIT_STDOUT
#define init_log_output(level, fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
#else
#define init_log_output(level, ...) syslog(level, ##__VA_ARGS__)
#endif
#ifdef CONFIG_SYSTEM_NXINIT_DEBUG
#define init_debug(...) syslog(LOG_USER, ##__VA_ARGS__)
#define init_debug(...) init_log_output(LOG_USER, ##__VA_ARGS__)
#define init_dump_args(argc, argv) \
{ \
int _i; \
@ -52,19 +59,19 @@
#endif
#ifdef CONFIG_SYSTEM_NXINIT_INFO
#define init_info(...) syslog(LOG_INFO, ##__VA_ARGS__)
#define init_info(...) init_log_output(LOG_INFO, ##__VA_ARGS__)
#else
#define init_info(...)
#endif
#ifdef CONFIG_SYSTEM_NXINIT_WARN
#define init_warn(...) syslog(LOG_WARNING, ##__VA_ARGS__)
#define init_warn(...) init_log_output(LOG_WARNING, ##__VA_ARGS__)
#else
#define init_warn(...)
#endif
#ifdef CONFIG_SYSTEM_NXINIT_ERR
#define init_err(f, ...) syslog(LOG_ERR, "Error " f, ##__VA_ARGS__)
#define init_err(f, ...) init_log_output(LOG_ERR, "Error " f, ##__VA_ARGS__)
#else
#define init_err(...)
#endif