请教freebsd+sendmail问题

blackdemonking

日志提示
Dec 29 06:09:36 mail sendmail[136]: NOQUEUE: SYSERR(UID0): getrequests:

accept:
Too many open files in system
Dec 29 07:40:36 mail sendmail[22074]: NOQUEUE: SYSERR(UID0): fill_fd:

disconnect
: cannot open /dev/null: Too many open files in system
Dec 29 08:18:10 mail sendmail[22113]: NOQUEUE: SYSERR(UID0): Cannot open

hash da
tabase /etc/aliases.db: Too many open files in system
pid 1474 (mail.local), uid 0 on /var: file system full
请问如何解决