The new GEN_SAFE_TIMEOUTREAD and GEN_SAFE_TIMEOUTWRITE makros allow to pass the name of a filedescriptor. This one is used to actually do the underlying read and write operations. However these functions get a fd argument passed. In some cases the descriptor passed to these makros actually is fd. This is not specific to the makros, the code was actually the same before.

Actually using fd are:

• qmail-pop3d.c
• qmail-popup.c
• qmail-smtpd.c

The argument is ignored and a hardcoded descriptor is used in:

• qmail-qmqpc.c
• qmail-remote.c

However I think that they are actually always identical, i.e. these functions could just use the fd argument and remove the makro argument entirely.