src-test2/usr.bin/lockf, branch releng/6.4FreeBSD source treehttps://cgit-dev.freebsd.org/src-test2/atom?h=releng%2F6.42008-09-25T14:27:00ZMFC:2008-09-25T14:27:00ZDavid Malonedwmalone@FreeBSD.org2008-09-25T14:27:00Zurn:sha1:a4bc5f0916a89b4f244f9a9d39d8eadf39123832
Lockf was exiting with status 1 if the command did not exit normally.
This is easy to confuse with the actual exit status of the program.
Instead exit with EX_SOFTWARE if the command doesn't exit normally.
Approved by: re (kib)
MFC lockf.c revision 1.172007-11-03T15:31:38ZChristian S.J. Peroncsjp@FreeBSD.org2007-11-03T15:31:38Zurn:sha1:d36303bc90dd6f402ed32dff5c23f61f2325d519
MFC lockf.1 revision 1.19
Sync with head:2005-11-12T21:00:00ZChristian S.J. Peroncsjp@FreeBSD.org2005-11-12T21:00:00Zurn:sha1:3231f6fc1028a716adcce05cd04200062cde4dcc
-style(9) nits
MFC Log:
Fix long standing race condition associated with how lockf uses open(2)
for mutual exclusion:
A brief description of the problem:
1) Proc A picks up non-blocking lock on file X
2) Proc B attempts to pickup lock, fails then waits
3) Proc C attempts to pickup lock, fails then waits
4) Proc A releases lock
5) Proc B acquires lock, release it to pickup a non-blocking version
6) Proc C acquires lock, release it to pickup a non-blocking version
7) Both process B and C race each other to pickup lock again
This occurs mainly because the processes do not keep the lock after they have
been waiting on it. They drop it, attempt to re-acquire it. (They use the wait
to notify when the lock has become available then race to pick it up). This
results in additional CPU utilization during the race, and can also result
in processes picking locks up out of order.
This change attempts to correct this problem by eliminating the test/acquire
race and having the operating system handle it.
MFC spelling fixes of several manpages.2005-08-18T15:01:27ZGiorgos Keramidaskeramida@FreeBSD.org2005-08-18T15:01:27Zurn:sha1:0dbc56408b7569141c93167f589bdeb8ce919e33
Approved by: re (kensmith)
The merged revisions/files are:
Revision Path
1.10 src/lib/libarchive/archive_entry.3
1.21 src/lib/libarchive/archive_read.3
1.8 src/lib/libautofs/libautofs.3
1.10 src/lib/libc/net/inet6_rth_space.3
1.8 src/lib/libc/posix1e/acl_get_entry.3
1.15 src/lib/libc/posix1e/mac.3
1.7 src/lib/libc/posix1e/mac_prepare.3
1.37 src/lib/libc/stdtime/strftime.3
1.16 src/lib/libc/sys/kse.2
1.8 src/lib/libc/sys/uuidgen.2
1.4 src/share/man/man4/man4.i386/acpi_ibm.4
1.6 src/share/man/man4/man4.i386/acpi_panasonic.4
1.40 src/share/man/man4/man4.i386/ep.4
1.6 src/share/man/man4/man4.i386/pbio.4
1.5 src/share/man/man4/man4.i386/snc.4
1.2 src/share/man/man4/man4.sparc64/openprom.4
1.4 src/share/man/man4/man4.sparc64/snd_audiocs.4
1.11 src/share/man/man4/witness.4
1.3 src/share/man/man5/devfs.conf.5
1.51 src/share/man/man9/ifnet.9
1.7 src/share/man/man9/printf.9
1.12 src/usr.bin/file2c/file2c.1
1.27 src/usr.bin/indent/indent.1
1.17 src/usr.bin/lockf/lockf.1
1.90 src/usr.bin/make/make.1
1.45 src/usr.bin/systat/systat.1
1.19 src/usr.bin/truss/truss.1
1.33 src/usr.bin/xinstall/install.1
1.11 src/usr.sbin/bluetooth/rfcomm_pppd/rfcomm_pppd.8
1.4 src/usr.sbin/bluetooth/sdpd/sdpd.8
1.9 src/usr.sbin/bsnmpd/modules/snmp_netgraph/snmp_netgraph.3
1.36 src/usr.sbin/i4b/isdnd/isdnd.rc.5
1.53 src/usr.sbin/mtree/mtree.8
1.8 src/usr.sbin/ndiscvt/ndiscvt.8
1.13 src/usr.sbin/ntp/doc/ntpdc.8
1.26 src/usr.sbin/pppd/pppd.8
1.40 src/usr.sbin/syslogd/syslog.conf.5
1.5 src/usr.sbin/wpa/wpa_supplicant/wpa_supplicant.conf.5
Markup and wording fixes.2005-06-14T11:50:53ZRuslan Ermilovru@FreeBSD.org2005-06-14T11:50:53Zurn:sha1:39c59153e929e3e663fe0efd645faa06f6c8b48e
Approved by: re (blanket)
Document a couple of gotchas.2005-05-26T22:30:12ZEivind Eklundeivind@FreeBSD.org2005-05-26T22:30:12Zurn:sha1:f2839e75f665bec6645f609d854df4f1b3e7170bAdded the EXIT STATUS section where appropriate.2005-01-17T07:44:44ZRuslan Ermilovru@FreeBSD.org2005-01-17T07:44:44Zurn:sha1:a866e170777b42fd7921eadd6e7e664f3a031d60Use warn() instead of perror().2004-07-15T04:51:21ZTim J. Robbinstjr@FreeBSD.org2004-07-15T04:51:21Zurn:sha1:208f2fd1ed5a88a11413c49834d2c37c289f9c7eMechanically kill hard sentence breaks.2004-07-02T22:22:35ZRuslan Ermilovru@FreeBSD.org2004-07-02T22:22:35Zurn:sha1:6a3e8b0adc8c622ae61275a94d5d869980a68069Consistently use FBSDID2002-06-30T05:25:07ZDavid E. O'Brienobrien@FreeBSD.org2002-06-30T05:25:07Zurn:sha1:e026a48c34d396fe7d0e382673a69bc047c0bfca