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posix_lock_file(9) [centos man page]

POSIX_LOCK_FILE(9)						   The Linux VFS						POSIX_LOCK_FILE(9)

NAME
posix_lock_file - Apply a POSIX-style lock to a file SYNOPSIS
int posix_lock_file(struct file * filp, struct file_lock * fl, struct file_lock * conflock); ARGUMENTS
filp The file to apply the lock to fl The lock to be applied conflock Place to return a copy of the conflicting lock, if found. DESCRIPTION
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 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. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 POSIX_LOCK_FILE(9)

Check Out this Related Man Page

VOP_ADVLOCK(9)						   BSD Kernel Developer's Manual					    VOP_ADVLOCK(9)

NAME
VOP_ADVLOCK -- advisory record locking SYNOPSIS
#include <sys/param.h> #include <sys/vnode.h> #include <sys/fcntl.h> #include <sys/lockf.h> int VOP_ADVLOCK(struct vnode *vp, caddr_t id, int op, struct flock *fl, int flags); DESCRIPTION
The arguments are: vp The vnode being manipulated. id The id token which is changing the lock. op The operation to perform (see fcntl(2)). fl Description of the lock. flags One of more of the following: F_RDLCK Shared or read lock. F_UNLCK Unlock. F_WRLCK Exclusive or write lock. F_WAIT Wait until lock is granted. F_FLOCK Use flock(2) semantics for lock. F_POSIX Use POSIX semantics for lock. This entry point manipulates advisory record locks on the file. Most file systems delegate the work for this call to lf_advlock(). RETURN VALUES
Zero is returned on success, otherwise an error is returned. SEE ALSO
fcntl(2), flock(2), vnode(9) AUTHORS
This manual page was written by Doug Rabson. BSD
June 30, 1999 BSD

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