The log_error function creates an entry in an error log, recording the date, the severity, and a description of the error.
int log_error(int degree, char *func, Session *sn, Request *rq, char *fmt, ...);
0 if the log entry is created, or -1 if the log entry is not created.
int degree specifies the severity of the error. The parameter value must be one of the following constants:
LOG_VERBOSE — Debug message
LOG_VERBOSE — Debug message
LOG_INFORM — Information message
LOG_WARN — Warning
LOG_FAILURE — Operation failed
LOG_MISCONFIG— Misconfiguration
LOG_SECURITY — Authentication or authorization failure
LOG_CATASTROPHE— Nonrecoverable server error
char *func is the name of the function where the error has occurred.
Session *sn is the session.
Request *rq is the request.
char *fmt specifies the format for the printf function that delivers the message.
log_error(LOG_WARN, "send-file", sn, rq, "error opening buffer from %s (%s)"), path, system_errmsg(fd));