lckpwdf(3C) lckpwdf(3C)
NAME
lckpwdf(), ulckpwdf() - control access to the /etc/passwd and /etc/shadow files
SYNOPSIS
DESCRIPTION
The and routines are used to coordinate modification access to the password file and to the shadow password file The lock file used by
these two routines is A process first calls to gain exclusive access rights for modification. When modifications are complete, is called
to release the lock on This mechanism prevents simultaneous modification of the files.
RETURN VALUE
The routine returns zero upon successful completion. If the lock could not be obtained, it returns -1 and sets to indicate the error.
The routine returns zero upon successful completion. If the lock has already been released, returns -1 and sets to indicate the error.
FILES
SEE ALSO
getpwent(3C), passwd(4), thread_safety(5).
lckpwdf(3C)
