rtapi_print, rtapi_print_msg - print diagnostic messages
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void rtapi_print(const char *fmt, ...) | |
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void rtapi_print_msg(int level, const char *fmt, ...) | |
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typedef void(*rtapi_msg_handler_t)(msg_level_t level, const char *msg); | |
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void rtapi_set_msg_handler(rtapi_msg_handler_t handler); | |
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rtapi_msg_handler_t rtapi_get_msg_handler(void); |
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level |
A message level: One of RTAPI_MSG_ERR, RTAPI_MSG_WARN, RTAPI_MSG_INFO, or RTAPI_MSG_DBG. |
handler
A function to call from rtapi_print or rtapi_print_msg to actually output the message.
fmt, ...
Other arguments are as for rtapi_vsnprintf(3rtapi).
rtapi_print and rtapi_print_msg work like the standard C printf functions, except that a reduced set of formatting operations are supported. Notably, formatting long-long values is not supported, and formatting floating-point values has different behavior than standard printf.
Depending on the RTOS, the default may be to print the message to stdout, stderr, a kernel log, etc. In RTAPI code, the action may be changed by a call to rtapi_set_msg_handler. A NULL argument to rtapi_set_msg_handler restores the default handler. rtapi_msg_get_handler returns the current handler. When the message came from rtapi_print, level is RTAPI_MSG_ALL.
rtapi_print_msg works like rtapi_print but only prints if level is less than or equal to the current message level.
rtapi_print and rtapi_print_msg May be called from user, init/cleanup, and realtime code. rtapi_get_msg_handler and rtapi_set_msg_handler may be called from realtime init/cleanup code. A message handler passed to rtapi_set_msg_handler may only call functions that can be called from realtime code.
None.
rtapi_set_msg_level(3rtapi), rtapi_get_msg_level(3rtapi), rtapi_vsnprintf(3rtapi)