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)
Check Out this Related Man Page
lckpwdf(3C) Standard C Library Functions lckpwdf(3C)NAME
lckpwdf, ulckpwdf - manipulate shadow password database lock file
SYNOPSIS
#include <shadow.h>
int lckpwdf(void);
int ulckpwdf(void);
DESCRIPTION
The lckpwdf() and ulckpwdf() functions enable modification access to the password databases through the lock file. A process first uses
lckpwdf() to lock the lock file, thereby gaining exclusive rights to modify the /etc/passwd or /etc/shadow password database. See
passwd(4) and shadow(4). Upon completing modifications, a process should release the lock on the lock file using ulckpwdf(). This mechanism
prevents simultaneous modification of the password databases. The lock file, /etc/.pwd.lock, is used to coordinate modification access to
the password databases /etc/passwd and /etc/shadow.
RETURN VALUES
If lckpwdf() is successful in locking the file within 15 seconds, it returns 0. If unsuccessful (for example, /etc/.pwd.lock is already
locked), it returns -1.
If ulckpwdf() is successful in unlocking the file /etc/.pwd.lock, it returns 0. If unsuccessful (for example, /etc/.pwd.lock is already
unlocked), it returns -1.
USAGE
These routines are for internal use only; compatibility is not guaranteed.
FILES
/etc/passwd password database
/etc/shadow shadow password database
/etc/.pwd.lock lock file
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO getpwnam(3C), getspnam(3C), passwd(4), shadow(4), attributes(5)SunOS 5.10 29 Dec 1996 lckpwdf(3C)
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