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RocketLink!--> Man page versions:
PW_INIT(3) OpenBSD Programmer's Manual PW_INIT(3)
pw_init, pw_setdir, pw_file, pw_edit, pw_prompt, pw_copy, pw_scan,
pw_error - utility functions for interactive passwd file updates
pw_setdir(const char *directory);
pw_file(const char *filename);
pw_edit(int notsetuid, const char *filename);
pw_copy(int ffd, int tfd, struct passwd *pw);
pw_scan(char *bp, struct passwd *pw, int *flags);
pw_error(const char *name, int err, int eval);
These functions are designed as conveniences for interactive programs
which update the passwd file and do nothing else. They generally handle
errors by printing out a message to the standard error stream and possi-
bly aborting the process.
The pw_init() function prepares for a passwd update by unlimiting all re-
source constraints, disabling core dumps (thus preventing dumping the
contents of the passwd database into a world-readable file), and dis-
abling most signals.
The pw_setdir() function sets an alternative directory where the rest of
the functions looks for password-related files. Use this if you are
writing utilities that should be able to handle password files outside of
The pw_file() function transforms filenames so that they end up in the
directory specified to the latest pw_setdir() call. The rule is that all
directories are stripped off the given name and only the filename is ap-
pended to the directory.
The pw_edit() function runs an editor (named by the environment variable
EDITOR, or /usr/bin/vi if EDITOR is not set) on the file filename (or
/etc/ptmp if filename is NULL). If notsetuid is nonzero, pw_edit() will
set the effective user and group ID to the real user and group ID before
running the editor.
The pw_prompt() function asks the user whether he or she wants to re-edit
the password file; if the answer is no, pw_prompt() deletes the lock file
and exits the process.
The pw_copy() function reads a passwd file from ffd and writes it to tfd,
updating the entry corresponding to pw->pw_name with the information in
The pw_scan() function accepts in bp a passwd entry as it would be repre-
sented in /etc/master.passwd and fills in pw with corresponding values;
string fields in pw will be pointers into bp. Some characters in bp will
be overwritten with 0s in order to terminate the strings pointed to by
pw. If flags is non-null, it is filled in with the following flags:
_PASSWORD_NOUID The uid field of bp is empty.
_PASSWORD_NOGID The gid field of bp is empty.
_PASSWD_NOCHG The change field of bp is empty.
_PASSWD_NOEXP The expire field of bp is empty.
The pw_error() function displays an error message, aborts the current
passwd update, and exits the current process. If err is non-zero, a
warning message beginning with name is printed for the current value of
errno. The process exits with status eval.
The pw_scan() function prints a warning message and returns 0 if the
string in the bp argument is not a valid passwd string. Otherwise,
pw_scan() returns 1.
OpenBSD 2.6 December 15, 1995 2
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
OpenBSD sources for pw_init(3)
Up to: Process Limits: Identity - Process ownership and Identity
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