MirOS Manual: pw_copy(3), pw_edit(3), pw_error(3), pw_file(3), pw_init(3), pw_prompt(3), pw_scan(3), pw_setdir(3)

PW_INIT(3)                 BSD 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


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


     pw_setdir(const char *directory);

     char *
     pw_file(const char *filename);

     pw_edit(int notsetuid, const char *filename);


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

     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
     resource constraints, disabling core dumps (thus preventing dumping the
     contents of the passwd database into a world-readable file), and disa-
     bling most signals.

     The pw_setdir() function sets an alternative directory where the rest of
     the functions look for password-related files. Use this if you are writ-
     ing 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 of 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
     pw. If opw is not NULL, opw->pw_name will be used for matching instead.
     Additionally, if the existing entry does not match opw, the operation is
     aborted. The use of opw allows the caller to change the user name in an
     entry as well as guarantee that the entry being replaced has not changed
     in the meantime.

     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 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 warn-
     ing 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.




     pw_lock(3), passwd(5)

MirOS BSD #10-current         December 15, 1995                              1

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