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author | 2019-08-30 03:57:56 +0000 | |
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committer | 2019-08-30 03:57:56 +0000 | |
commit | 44946945c606b51e7b038457a2337993eb9bf2bc (patch) | |
tree | eae9f189d2a8d7717e015744b9f0d4b8811e75ae /lib/libutil/uucplock.3 | |
parent | whitespace, found while pondering improvements to sffdump (diff) | |
download | wireguard-openbsd-44946945c606b51e7b038457a2337993eb9bf2bc.tar.xz wireguard-openbsd-44946945c606b51e7b038457a2337993eb9bf2bc.zip |
uucplock(3) is incorrectly named in some places, it is actually uu_lock(3)
(more unclear is if anything in ports uses this, as our base no longer does)
Diffstat (limited to 'lib/libutil/uucplock.3')
-rw-r--r-- | lib/libutil/uucplock.3 | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/lib/libutil/uucplock.3 b/lib/libutil/uucplock.3 deleted file mode 100644 index b94f61ca907..00000000000 --- a/lib/libutil/uucplock.3 +++ /dev/null @@ -1,178 +0,0 @@ -.\" $OpenBSD: uucplock.3,v 1.19 2015/11/10 23:48:18 jmc Exp $ -.\" -.\" All rights reserved. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR -.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES -.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. -.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, -.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT -.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF -.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -.\" -.\" " -.Dd $Mdocdate: November 10 2015 $ -.Dt UU_LOCK 3 -.Os -.Sh NAME -.Nm uu_lock , -.Nm uu_unlock , -.Nm uu_lockerr , -.Nm uu_lock_txfr -.Nd acquire and release control of a serial device -.Sh SYNOPSIS -.In sys/types.h -.In util.h -.Ft int -.Fn uu_lock "const char *ttyname" -.Ft int -.Fn uu_lock_txfr "const char *ttyname" "pid_t pid" -.Ft int -.Fn uu_unlock "const char *ttyname" -.Ft const char * -.Fn uu_lockerr "int uu_lockresult" -.Sh DESCRIPTION -The -.Fn uu_lock -function attempts to create a lock file called -.Pa /var/spool/lock/LCK.. -with a suffix given by the passed -.Fa ttyname . -If the file already exists, it is expected to contain the process -ID of the locking program. -.Pp -If the file does not already exist, or the owning process given by -the process ID found in the lock file is no longer running, -.Fn uu_lock -will write its own process ID into the file and return success. -.Pp -.Fn uu_lock_txfr -transfers lock ownership to another process. -.Fn uu_lock -must have previously been successful. -.Pp -.Fn uu_unlock -removes the lockfile created by -.Fn uu_lock -for the given -.Fa ttyname . -Care should be taken that -.Fn uu_lock -was successful before calling -.Fn uu_unlock . -.Pp -.Fn uu_lockerr -returns an error string representing the error -.Fa uu_lockresult , -as returned from -.Fn uu_lock . -.Sh RETURN VALUES -.Fn uu_unlock -returns 0 on success and \-1 on failure. -.Pp -.Fn uu_lock -may return any of the following values: -.Pp -.Dv UU_LOCK_INUSE : -The lock is in use by another process. -.Pp -.Dv UU_LOCK_OK : -The lock was successfully created. -.Pp -.Dv UU_LOCK_OPEN_ERR : -The lock file could not be opened via -.Xr open 2 . -.Pp -.Dv UU_LOCK_READ_ERR : -The lock file could not be read via -.Xr read 2 . -.Pp -.Dv UU_LOCK_CREAT_ERR : -Can't create temporary lock file via -.Xr creat 3 . -.Pp -.Dv UU_LOCK_WRITE_ERR : -The current process ID could not be written to the lock file via a call to -.Xr write 2 . -.Pp -.Dv UU_LOCK_LINK_ERR : -Can't link temporary lock file via -.Xr link 2 . -.Pp -.Dv UU_LOCK_TRY_ERR : -Locking attempts are failed after 5 tries. -.Pp -If a value of -.Dv UU_LOCK_OK -is passed to -.Fn uu_lockerr , -an empty string is returned. -Otherwise, a string specifying -the reason for failure is returned. -.Fn uu_lockerr -uses the current value of -.Va errno -to determine the exact error. -Care should be made not to allow -.Va errno -to be changed between calls to -.Fn uu_lock -and -.Fn uu_lockerr . -.Pp -.Fn uu_lock_txfr -may return any of the following values: -.Pp -.Dv UU_LOCK_OK : -The transfer was successful. -The specified process now holds the device lock. -.Pp -.Dv UU_LOCK_OWNER_ERR : -The current process does not already own a lock on the specified device. -.Pp -.Dv UU_LOCK_WRITE_ERR : -The new process ID could not be written to the lock file via a call to -.Xr write 2 . -.Sh ERRORS -If -.Fn uu_lock -returns one of the error values above, the global value -.Va errno -can be used to determine the cause. -Refer to the respective manual pages for further details. -.Pp -.Fn uu_unlock -will set the global variable -.Va errno -to reflect the reason that the lock file could not be removed. -Refer to the description of -.Xr unlink 2 -for further details. -.Sh SEE ALSO -.Xr lseek 2 , -.Xr open 2 , -.Xr read 2 , -.Xr write 2 -.Sh BUGS -It is possible that a stale lock is not recognised as such if a new -process is assigned the same process ID as the program that left -the stale lock. -.Pp -The calling process must have write permissions to the -.Pa /var/spool/lock -directory. -There is no mechanism in place to ensure that the -permissions of this directory are the same as those of the -serial devices that might be locked. |