| PW_LOCK(3) | Library Functions Manual | PW_LOCK(3) |
pw_lock, pw_mkdb,
pw_abort, pw_setprefix,
pw_getprefix —
#include <util.h>
int
pw_lock(int
retries);
int
pw_mkdb(const
char *username, int
secureonly);
void
pw_abort(void);
int
pw_setprefix(const
char *new_prefix);
const char *
pw_getprefix(void);
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
database 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.
pw_lock() and pw_mkdb()
functions return -1 if they are unable to complete properly.
| February 17, 2007 | NetBSD 9.2 |