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-
- GETPWENT(3) UNIX Programmer's Manual GETPWENT(3)
-
- NNAAMMEE
- ggeettppwweenntt, ggeettppwwnnaamm, ggeettppwwuuiidd, sseettppaasssseenntt, sseettppwweenntt, eennddppwweenntt - password
- database operations
-
- SSYYNNOOPPSSIISS
- ##iinncclluuddee <<ssyyss//ttyyppeess..hh>>
- ##iinncclluuddee <<ppwwdd..hh>>
-
- _s_t_r_u_c_t _p_a_s_s_w_d _*
- ggeettppwweenntt(_v_o_i_d)
-
- _s_t_r_u_c_t _p_a_s_s_w_d _*
- ggeettppwwnnaamm(_c_o_n_s_t _c_h_a_r _*_l_o_g_i_n)
-
- _s_t_r_u_c_t _p_a_s_s_w_d _*
- ggeettppwwuuiidd(_u_i_d___t _u_i_d)
-
- _i_n_t
- sseettppaasssseenntt(_i_n_t _s_t_a_y_o_p_e_n)
-
- _i_n_t
- sseettppwweenntt(_v_o_i_d)
-
- _v_o_i_d
- eennddppwweenntt(_v_o_i_d)
-
- DDEESSCCRRIIPPTTIIOONN
- These functions operate on the password database file which is described
- in passwd(5). Each entry in the database is defined by the structure
- _p_a_s_s_w_d found in the include file <_p_w_d_._h>:
-
- struct passwd {
- char *pw_name; /* user name */
- char *pw_passwd; /* encrypted password */
- uid_t pw_uid; /* user uid */
- gid_t pw_gid; /* user gid */
- time_t pw_change; /* password change time */
- char *pw_class; /* user access class */
- char *pw_gecos; /* Honeywell login info */
- char *pw_dir; /* home directory */
- char *pw_shell; /* default shell */
- time_t pw_expire; /* account expiration */
- };
-
- The functions ggeettppwwnnaamm() and ggeettppwwuuiidd() search the password database for
- the given login name or user uid, respectively, always returning the
- first one encountered.
-
- The ggeettppwweenntt() function sequentially reads the password database and is
- intended for programs that wish to process the complete list of users.
-
- The sseettppaasssseenntt() function accomplishes two purposes. First, it causes
- ggeettppwweenntt() to ``rewind'' to the beginning of the database. Additionally,
- if _s_t_a_y_o_p_e_n is nonzero, file descriptors are left open, significantly
- speeding up subsequent accesses for all of the routines. (This latter
- functionality is unnecessary for ggeettppwweenntt() as it doesn't close its file
- descriptors by default.)
-
- It is dangerous for longrunning programs to keep the file descriptors
- open the database will become out of date if it is updated while the pro
- gram is running.
-
-
- The sseettppwweenntt() function is identical to sseettppaasssseenntt() with an argument of
- zero.
-
- The eennddppwweenntt() function closes any open files.
-
- These routines have been written to ``shadow'' the password file, e.g.
- allow only certain programs to have access to the encrypted password. If
- the process which calls them has an effective uid of 0, the encrypted
- password will be returned, otherwise, the password field of the retuned
- structure will point to the string `*'.
-
- RREETTUURRNN VVAALLUUEESS
- The functions ggeettppwweenntt(), ggeettppwwnnaamm(), and ggeettppwwuuiidd(), return a valid
- pointer to a passwd structure on success and a null pointer if endof
- file is reached or an error occurs. The functions sseettppaasssseenntt() and
- sseettppwweenntt() return 0 on failure and 1 on success. The eennddppwweenntt() function
- has no return value.
-
- FFIILLEESS
- /var/db/pwd.db The insecure password database file
- /var/db/spwd.db The secure password database file
- /etc/master.passwd The current password file
- /etc/passwd A Version 7 format password file
-
- SSEEEE AALLSSOO
- getlogin(3), getgrent(3), passwd(5), pwd_mkdb(8), vipw(8)
-
- HHIISSTTOORRYY
- The ggeettppwweenntt, ggeettppwwnnaamm, ggeettppwwuuiidd, sseettppwweenntt,, and eennddppwweenntt functions ap
- peared in Version 7 AT&T UNIX. The sseettppaasssseenntt function appeared in
- 4.3BSD-Reno.
-
- BBUUGGSS
- The functions ggeettppwweenntt(), ggeettppwwnnaamm(), and ggeettppwwuuiidd(), leave their results
- in an internal static object and return a pointer to that object. Subse
- quent calls to the same function will modify the same object.
-
- The routines ggeettppwweenntt(), eennddppwweenntt(), sseettppaasssseenntt(), and sseettppwweenntt() are
- fairly useless in a networked environment and should be avoided, if pos
- sible.
-
- CCOOMMPPAATTIIBBIILLIITTYY
- The historic function setpwfile(3), which allowed the specification of
- alternate password databases, has been deprecated and is no longer avail
- able.
-
- BSD Experimental April 19, 1991 2
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