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NetBSD 6.1.5 - man page for pw_lock (netbsd section 3)

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PW_LOCK(3)			   BSD Library Functions Manual 		       PW_LOCK(3)

     pw_lock, pw_mkdb, pw_abort, pw_setprefix, pw_getprefix -- passwd file update functions

     System Utilities Library (libutil, -lutil)

     #include <util.h>

     pw_lock(int retries);

     pw_mkdb(const char *username, int secureonly);


     pw_setprefix(const char *new_prefix);

     const char *

     The pw_lock(), pw_mkdb(), and pw_abort() functions allow a program to update the system
     passwd database.

     The pw_lock() function attempts to lock the passwd database by creating the file /etc/ptmp,
     and returns the file descriptor of that file.  If retries is greater than zero, pw_lock()
     will try multiple times to open /etc/ptmp, waiting one second between tries.  In addition to
     being a lock file, /etc/ptmp will also hold the contents of the new passwd file.

     The pw_mkdb() function updates the passwd file from the contents of /etc/ptmp.  You should
     finish writing to and close the file descriptor returned by pw_lock() before calling
     pw_mkdb().  If pw_mkdb() fails and you do not wish to retry, you should make sure to call
     pw_abort() to clean up the lock file.  If the username argument is not NULL, only database
     entries pertaining to the specified user will be modified.  If the secureonly argument is
     non-zero, only the secure database will be updated.

     The pw_abort() function aborts a passwd file update by deleting /etc/ptmp.  The passwd data-
     base remains unchanged.

     The pw_setprefix() function defines the root directory used for passwd file updates.  If the
     prefix is set to /newroot pw_lock() will operate on /newroot/etc/ptmp afterwards.	The
     default prefix is an empty string.

     The pw_getprefix() function returns the root directory which is currently used for passwd
     file updates.

     The pw_lock() and pw_mkdb() functions return -1 if they are unable to complete properly.


     pw_init(3), pwd_mkdb(8)

BSD					February 17, 2007				      BSD
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