Why Am I Getting a 'Bad File Descriptor' Error in My Go Logging Routine?

Fixing "Bad File Descriptor" Issue in Go Logging Routine

When encountering the "bad file descriptor" error while appending to a logging file within a Go routine, it's important to investigate the underlying cause. The error suggests that the file descriptor is invalid or inappropriate for the intended operation.

In this particular case, the issue stems from neglecting to specify the appropriate flag when opening the log file. By default, Go's os.OpenFile function opens the file in read-only mode, hence the "bad file descriptor" error when attempting to write to it.

The solution lies in adding the O_WRONLY flag to the os.OpenFile call. This flag indicates that the file should be opened for writing, ensuring that the file descriptor obtained is valid for write operations. Here's the corrected code:

if f, err := os.OpenFile("./log.log", os.O_APPEND|os.O_WRONLY, os.ModeAppend); err != nil { /*[...]*/ }

By incorporating the O_WRONLY flag, the Go routine can successfully open the log file for writing and append log messages without encountering the "bad file descriptor" error.

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