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| author | Douglas Gilbert <dgilbert@interlog.com> | 2008-07-15 02:47:47 +0000 |
|---|---|---|
| committer | Douglas Gilbert <dgilbert@interlog.com> | 2008-07-15 02:47:47 +0000 |
| commit | f514890a9e9eefffc6487bf67c5db29fe005f57e (patch) | |
| tree | a5b5af1c6fd086e0a54ca686f26c115db172c094 /doc/sg_dd.8 | |
| parent | 79e83bc385a5ead70b728f64829d1bebeba208dc (diff) | |
| download | sg3_utils-f514890a9e9eefffc6487bf67c5db29fe005f57e.tar.gz | |
sg_dd: flock(LOCK_EX|LOCK_NB) option
git-svn-id: https://svn.bingwo.ca/repos/sg3_utils/trunk@186 6180dd3e-e324-4e3e-922d-17de1ae2f315
Diffstat (limited to 'doc/sg_dd.8')
| -rw-r--r-- | doc/sg_dd.8 | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/doc/sg_dd.8 b/doc/sg_dd.8 index 2e585373..e98124fb 100644 --- a/doc/sg_dd.8 +++ b/doc/sg_dd.8 @@ -1,4 +1,4 @@ -.TH SG_DD "8" "April 2008" "sg3_utils\-1.26" SG3_UTILS +.TH SG_DD "8" "July 2008" "sg3_utils\-1.27" SG3_UTILS .SH NAME sg_dd \- copies data to and from files and devices. Specialised for devices that understand the SCSI command set. @@ -243,6 +243,14 @@ excl causes the O_EXCL flag to be added to the open of \fIIFILE\fR and/or \fIOFILE\fR. .TP +flock +after opening the associated file (i.e. \fIIFILE\fR and/or \fIOFILE\fR) +an attempt is made to get an advisory exclusive lock with the flock() +system call is made. The flock arguments are "FLOCK_EX | FLOCK_NB" which +will cause the lock to be taken if available else a "temporarily unavailable" +error is generated. An exit status of 90 is produced in the latter case +and no copy is done. +.TP fua causes the FUA (force unit access) bit to be set in SCSI READ and/or WRITE commands. This only has an effect with sg devices or block devices @@ -411,6 +419,9 @@ the sg3_utils(8) man page. Since this utility works at a higher level than individual commands, and there are 'coe' and 'retries' flags, individual SCSI command failures do not necessary cause the process to exit. +.PP +An additional exit status of 90 is generated if the flock flag is given +and some other process holds the advisory exclusive lock. .SH AUTHORS Written by Doug Gilbert and Peter Allworth. .SH "REPORTING BUGS" |