'\" t
.\"     Title: posix_lock_file
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: April 2019
.\"    Manual: The Linux VFS
.\"    Source: Kernel Hackers Manual 4.9.168
.\"  Language: English
.\"
.TH "POSIX_LOCK_FILE" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "The Linux VFS"
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.SH "NAME"
posix_lock_file \- Apply a POSIX\-style lock to a file
.SH "SYNOPSIS"
.HP \w'int\ posix_lock_file('u
.BI "int posix_lock_file(struct\ file\ *\ " "filp" ", struct\ file_lock\ *\ " "fl" ", struct\ file_lock\ *\ " "conflock" ");"
.SH "ARGUMENTS"
.PP
\fIfilp\fR
.RS 4
The file to apply the lock to
.RE
.PP
\fIfl\fR
.RS 4
The lock to be applied
.RE
.PP
\fIconflock\fR
.RS 4
Place to return a copy of the conflicting lock, if found\&.
.RE
.SH "DESCRIPTION"
.PP
Add a POSIX style lock to a file\&. We merge adjacent & overlapping locks whenever possible\&. POSIX locks are sorted by owner task, then by starting address
.PP
Note that if called with an FL_EXISTS argument, the caller may determine whether or not a lock was successfully freed by testing the return value for \-ENOENT\&.
.SH "COPYRIGHT"
.br