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man:getpw

GETPW(3) Linux Programmer's Manual GETPW(3)

NAME

     getpw - reconstruct password line entry

SYNOPSIS

     #define _GNU_SOURCE             /* See feature_test_macros(7) */
     #include <sys/types.h>
     #include <pwd.h>
     int getpw(uid_t uid, char *buf);

DESCRIPTION

     The getpw() function reconstructs the password line entry for the given
     user ID uid in the buffer buf.  The returned buffer contains a line  of
     format
         name:passwd:uid:gid:gecos:dir:shell
     The passwd structure is defined in <pwd.h> as follows:
         struct passwd {
             char   *pw_name;       /* username */
             char   *pw_passwd;     /* user password */
             uid_t   pw_uid;        /* user ID */
             gid_t   pw_gid;        /* group ID */
             char   *pw_gecos;      /* user information */
             char   *pw_dir;        /* home directory */
             char   *pw_shell;      /* shell program */ };
     For more information about the fields of this structure, see passwd(5).

RETURN VALUE

     The getpw() function returns 0 on success; on error, it returns -1, and
     errno is set to indicate the error.
     If  uid is not found in the password database, getpw() returns -1, sets
     errno to 0, and leaves buf unchanged.

ERRORS

     0 or ENOENT
            No user corresponding to uid.
     EINVAL buf is NULL.
     ENOMEM Insufficient memory to allocate passwd structure.

FILES

     /etc/passwd
            password database file

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     +----------+---------------+----------------+
     |Interface | Attribute     | Value          |
     +----------+---------------+----------------+
     |getpw()   | Thread safety | MT-Safe locale |
     +----------+---------------+----------------+

CONFORMING TO

     SVr2.

BUGS

     The  getpw()  function  is  dangerous  as  it may overflow the provided
     buffer buf.  It is obsoleted by getpwuid(3).

SEE ALSO

     endpwent(3), fgetpwent(3), getpwent(3), getpwnam(3), getpwuid(3), putp-
     went(3), setpwent(3), passwd(5)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.

GNU 2017-09-15 GETPW(3)

/data/webs/external/dokuwiki/data/pages/man/getpw.txt · Last modified: 2019/05/17 09:32 by 127.0.0.1

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