r295924: Make sure that hash-based db files fsync befor closing/syncing.
r295925: We no longer need O_SYNC pwd_mkd
r295465: We no longer need O_SYNC on services_mkdb
r295800: We no longer need O_SYNC on cap_mkdb
This should improve the performance of building db files.
Make cap_mkdb and services_mkdb file operations sync
Similar fix was done for passwd and group operations in r285050. When a
temporary file is created and then renamed to replace official file there
are no checks to make sure data was written to disk and if a power cycle
happens at this time, system can end up with a 0 length file
Approved by: bapt
Sponsored by: Netgate
Differential Revision: https://reviews.freebsd.org/D2982
In addition to adding missing `static' keywords:
- bin/dd: Pull in `extern.h' to guarantee consistency with source file.
- libexec/rpc.rusersd: Move shared globals into an extern.h.
- libexec/talkd: Move `debug' and `hostname' into extern.h.
- usr.bin/cksum: Put counters in extern.h, as they are used by ckdist/mtree.
- usr.bin/m4: Move `end_result' into extern.h.
- usr.sbin/services_mkdb: Move shared globals into an extern.h.
