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NAME    [Toc]    [Back]

     pw_init, pw_edit, pw_prompt, pw_copy, pw_scan, pw_error - utility functions
 for interactive passwd file updates

LIBRARY    [Toc]    [Back]

     System Utilities Library (libutil, -lutil)

SYNOPSIS    [Toc]    [Back]

     #include <pwd.h>
     #include <util.h>


     pw_edit(int notsetuid, const char *filename);


     pw_copy(int ffd, int tfd, struct passwd *pw, struct passwd *old_pw);

     pw_scan(char *bp, struct passwd *pw, int *flags);

     pw_error(const char *name, int err, int eval);

DESCRIPTION    [Toc]    [Back]

     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 possibly
 aborting the process.

     The pw_init() function prepares for a passwd update by unlimiting all
     resource constraints, disabling core dumps (thus preventing dumping the
     contents of the passwd database into a world-readable file), and disabling
 most signals.

     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
     pw.  If old_pw is not NULL, it checks to make sure the old entry is the
     same as the one described in old_pw or the process is aborted.  If an
     entry is not found to match pw, a new entry is appended to the passwd
     file only if the real user ID is 0.

     The pw_scan() function accepts in bp a passwd entry as it would be represented
 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 should be cleared and the following options
     enabled if required:

           _PASSWORD_NOWARN  Don't print warnings.

           _PASSWORD_OLDFMT  Parse bp as an old format entry as found in

     Upon return it is cleared, and 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.

RETURN VALUES    [Toc]    [Back]

     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.

FILES    [Toc]    [Back]


SEE ALSO    [Toc]    [Back]

     pw_lock(3), passwd(5)

BSD                            December 15, 1995                           BSD
[ Back ]
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