sasl_listmech() returns a string listing the SASL names of all the mechanisms available to the specified user. This is typically given to the client through a capability command or initial server response. Client applications need this list so that they know what mechanisms the server supports.
conn the SASL context for this connection
user (optional) restricts the mechanism list to only those available to the user.
prefix appended to beginning of result
sep appended between mechanisms
suffix appended to end of result
result NULL terminated result string (allocated/freed by library)
plen length of result filled in by library. May be NULL
pcount Number of mechanisms available (filled in by library). May be NULL
may give the string
as a result