[LU-14913] flush stdout/stderr for llapi_printf()/llapi_error

• Type: Task
• Resolution: Won't Do
• Priority: Minor
• Assignee: Feng Lei
• Reporter: Feng Lei

Description

llapi_printf() and llapi_error() use fprintf() to print message to stdout/stderr stream , so the content may be buffered and cannot be printed in time, especially if the stdout/stderr is redirected. Sometime this behavior is confusing. , so flush the stdout/stderr after printing the message in llapi_printf()/llapi_error().